WO2017155046A1 - 熱電変換材料とそれを有する熱電変換装置、熱化学電池及び熱電センサー - Google Patents
熱電変換材料とそれを有する熱電変換装置、熱化学電池及び熱電センサー Download PDFInfo
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- WO2017155046A1 WO2017155046A1 PCT/JP2017/009511 JP2017009511W WO2017155046A1 WO 2017155046 A1 WO2017155046 A1 WO 2017155046A1 JP 2017009511 W JP2017009511 W JP 2017009511W WO 2017155046 A1 WO2017155046 A1 WO 2017155046A1
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- thermoelectric conversion
- cyclodextrin
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- concentration
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 title claims abstract description 51
- 150000001875 compounds Chemical class 0.000 claims abstract description 71
- 229920000858 Cyclodextrin Polymers 0.000 claims description 57
- 239000003792 electrolyte Substances 0.000 claims description 32
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 claims description 28
- 229920002472 Starch Polymers 0.000 claims description 22
- 239000008107 starch Substances 0.000 claims description 22
- 235000019698 starch Nutrition 0.000 claims description 20
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 11
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 11
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 11
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 claims description 9
- 229940006461 iodide ion Drugs 0.000 claims description 9
- WRTMQOHKMFDUKX-UHFFFAOYSA-N triiodide Chemical compound I[I-]I WRTMQOHKMFDUKX-UHFFFAOYSA-N 0.000 claims description 8
- 229940006158 triiodide ion Drugs 0.000 claims description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 6
- MFDKAMXLXHPQEC-UHFFFAOYSA-N cobalt;2-pyridin-2-ylpyridine Chemical compound [Co].N1=CC=CC=C1C1=CC=CC=N1.N1=CC=CC=C1C1=CC=CC=N1.N1=CC=CC=C1C1=CC=CC=N1 MFDKAMXLXHPQEC-UHFFFAOYSA-N 0.000 claims description 6
- 150000001923 cyclic compounds Chemical class 0.000 claims description 6
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 claims description 3
- UETZVSHORCDDTH-UHFFFAOYSA-N iron(2+);hexacyanide Chemical compound [Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] UETZVSHORCDDTH-UHFFFAOYSA-N 0.000 claims description 3
- HFHDHCJBZVLPGP-RWMJIURBSA-N alpha-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO HFHDHCJBZVLPGP-RWMJIURBSA-N 0.000 description 69
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 36
- 229920001450 Alpha-Cyclodextrin Polymers 0.000 description 35
- 229940043377 alpha-cyclodextrin Drugs 0.000 description 34
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 description 30
- 238000010586 diagram Methods 0.000 description 28
- 239000007800 oxidant agent Substances 0.000 description 23
- GDSRMADSINPKSL-HSEONFRVSA-N gamma-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO GDSRMADSINPKSL-HSEONFRVSA-N 0.000 description 21
- -1 iodide ions Chemical class 0.000 description 19
- 239000001116 FEMA 4028 Substances 0.000 description 18
- 235000011175 beta-cyclodextrine Nutrition 0.000 description 18
- 229960004853 betadex Drugs 0.000 description 18
- 230000001590 oxidative effect Effects 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 239000001103 potassium chloride Substances 0.000 description 15
- 235000011164 potassium chloride Nutrition 0.000 description 15
- 150000002500 ions Chemical class 0.000 description 14
- 239000003125 aqueous solvent Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 239000003638 chemical reducing agent Substances 0.000 description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 11
- 229940080345 gamma-cyclodextrin Drugs 0.000 description 10
- 239000000178 monomer Substances 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 8
- 229910001414 potassium ion Inorganic materials 0.000 description 7
- 238000006722 reduction reaction Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- GPRSOIDYHMXAGW-UHFFFAOYSA-N cyclopenta-1,3-diene cyclopentanecarboxylic acid iron Chemical compound [CH-]1[CH-][CH-][C-]([CH-]1)C(=O)O.[CH-]1C=CC=C1.[Fe] GPRSOIDYHMXAGW-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229920000856 Amylose Polymers 0.000 description 5
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- 229910052697 platinum Inorganic materials 0.000 description 5
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000008103 glucose Substances 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- HOXINJBQVZWYGZ-UHFFFAOYSA-N fenbutatin oxide Chemical compound C=1C=CC=CC=1C(C)(C)C[Sn](O[Sn](CC(C)(C)C=1C=CC=CC=1)(CC(C)(C)C=1C=CC=CC=1)CC(C)(C)C=1C=CC=CC=1)(CC(C)(C)C=1C=CC=CC=1)CC(C)(C)C1=CC=CC=C1 HOXINJBQVZWYGZ-UHFFFAOYSA-N 0.000 description 3
- 239000002608 ionic liquid Substances 0.000 description 3
- 238000006479 redox reaction Methods 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- YEAQKJGWTCLKJJ-PIGKAOJQSA-N COC[C@H]([C@H]([C@@H]([C@H]1OC)OC)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O3)[C@H](OC)[C@H]2OC)COC)O[C@@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@@H]3O[C@@H]1COC Chemical compound COC[C@H]([C@H]([C@@H]([C@H]1OC)OC)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O3)[C@H](OC)[C@H]2OC)COC)O[C@@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@@H]3O[C@@H]1COC YEAQKJGWTCLKJJ-PIGKAOJQSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
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- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229940113125 polyethylene glycol 3000 Drugs 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 238000001338 self-assembly Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005679 Peltier effect Effects 0.000 description 1
- 229920002560 Polyethylene Glycol 3000 Polymers 0.000 description 1
- 229920001030 Polyethylene Glycol 4000 Polymers 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- 230000005678 Seebeck effect Effects 0.000 description 1
- 230000005680 Thomson effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 229940097362 cyclodextrins Drugs 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/12—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M14/00—Electrochemical current or voltage generators not provided for in groups H01M6/00 - H01M12/00; Manufacture thereof
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/01—Manufacture or treatment
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/80—Constructional details
- H10N10/81—Structural details of the junction
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/80—Constructional details
- H10N10/85—Thermoelectric active materials
- H10N10/851—Thermoelectric active materials comprising inorganic compositions
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/80—Constructional details
- H10N10/85—Thermoelectric active materials
- H10N10/856—Thermoelectric active materials comprising organic compositions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/30—Deferred-action cells
- H01M6/36—Deferred-action cells containing electrolyte and made operational by physical means, e.g. thermal cells
Definitions
- the present invention relates to a thermoelectric conversion material, a thermoelectric conversion device including the thermoelectric conversion material, a thermochemical battery, and a thermoelectric sensor.
- This application claims priority on March 9, 2016 based on Japanese Patent Application No. 2016-046309 for which it applied to Japan, and uses the content here.
- thermoelectric conversion materials have attracted attention in order to convert minute energy such as waste heat into electric power.
- expectations are high for thin and efficient thermoelectric conversion materials as an energy source for mobile devices.
- conventional alloy-based thermoelectric conversion materials have the disadvantages of high thermal conductivity and low Seebeck coefficient (Se). Therefore, a thermochemical battery, which is a kind of thermoelectric conversion material using a solution of ions capable of redox, has recently attracted attention (Non-Patent Document 1).
- the Seebeck coefficient (Se) of a conventional solid thermoelectric alloy is about 0.2 mV / K
- a thermochemical battery can be manufactured at a low cost while the Seebeck coefficient (Se) has a value that is an order of magnitude larger.
- Expected For example, in a thermochemical cell composed of I ⁇ and I 3 ⁇ , an electric potential is generated when an equilibrium potential formed by redox equilibrium is shifted between a high temperature and a low temperature.
- the Seebeck coefficient is about 600 ⁇ V / K, which is known to be higher than that of alloy-based thermoelectric conversion materials.
- the conductivity of the electrolyte is low. Further improvement of the Seebeck coefficient has been required (Non-Patent Document 2).
- the present invention is a new technique for improving the Seebeck coefficient, and is capable of selectively capturing only one of the redox pairs at a low temperature and releasing it at a high temperature. Focused on compounds.
- the redox couple is an iodide ion (I ⁇ ) and a triiodide ion (I 3 ⁇ )
- I ⁇ iodide ion
- I 3 ⁇ triiodide ion
- focusing on host-guest chemistry for example, by adding cyclodextrin to the electrolyte
- I 3 - is trapped by cyclodextrin, whereas at high temperatures, I 3 - is released, so that the redox equilibrium potential is greatly shifted.
- an object of the present invention is to provide a thermoelectric conversion material with improved Seebeck coefficient and improved thermoelectric conversion efficiency.
- the Seebeck coefficient can be improved over conventional thermoelectric conversion materials by selectively adding to the electrolyte a capture compound that selectively captures one of the redox couples at a low temperature and releases it at a high temperature. It was.
- the Seebeck coefficient (Se) is 2 mV. It was found that it is possible to improve to about / K.
- the present invention is as follows [1] to [11].
- thermoelectric conversion material comprising a capture compound that selectively captures only one of the redox pairs at a low temperature and releases it at a high temperature.
- the capture compound is at least one selected from the group consisting of a cyclic compound and a helical compound.
- the trapping compound is a molecule that self-assembles at a low temperature.
- the capture compound is a host compound that forms an inclusion compound.
- the redox pair is a pair selected from the group consisting of iodide ion and triiodide ion, ferrocyanide ion and ferricyanide ion, cobalt trisbipyridine (II) and cobalt trisbipyridine (III).
- thermoelectric conversion material according to any one of [1] to [5], wherein [7] The thermoelectric conversion material according to any one of [1] to [6], further comprising an electrolyte that causes the capture compound to self-assemble at a low temperature.
- a thermoelectric conversion device comprising the thermoelectric conversion material according to any one of [1] to [7] and a pair of electrodes.
- a thermochemical battery comprising the thermoelectric conversion device according to [8] or [9].
- a thermoelectric sensor comprising the thermoelectric conversion device according to [8] or [9].
- the Seebeck coefficient it is possible to improve the Seebeck coefficient over the conventional thermoelectric conversion material by selectively adding only one of the redox couples at a low temperature and adding a capture compound that is released at a high temperature to the electrolyte. It becomes possible.
- the Seebeck coefficient can be improved to about 2000 ⁇ V / K.
- thermoelectric conversion apparatus shown with the thermoelectric conversion material of this invention.
- ⁇ - cyclodextrin by I 3 - is a conceptual diagram showing a selectively to clathrate. It is a conceptual diagram showing that I 3 - is selectively included in the vicinity of the first electrode on the low temperature side by adding ⁇ -cyclodextrin ( ⁇ -CD). Seebeck coefficient (Se) and ratio of [ ⁇ -cyclodextrin addition concentration ([ ⁇ -CD] 0 ) to I 3 ⁇ addition concentration ([I 3 ⁇ ] 0 ) ([ ⁇ CD] 0 / [I 3 - ] 0 ) is a diagram showing a relationship.
- FIG. 3 is a conceptual diagram showing that an inclusion compound of ⁇ -cyclodextrin and I 3 ⁇ further self-assembles with potassium ions in a system containing potassium ions. It is a figure which shows the complex density
- ⁇ - cyclodextrin ( ⁇ -CD), ⁇ - cyclodextrin ( ⁇ -CD), ⁇ - cyclodextrin (gamma-CD) and I 3 - is a Arrhenius plot of the binding constant for forming the ion and inclusion compounds. It is a conceptual diagram which shows that the amylose which is a main component of starch takes in an iodine.
- FIG. 6 is a diagram recording changes with time in power density of a battery to which ⁇ -CD and an electrolyte are added. It is a figure which shows the Seebeck coefficient (solid line, mV / K) after KCl addition.
- FIG. 3 is a diagram showing a crystal structure of K [( ⁇ -CD) 2 -I 5 ].
- I 3 - increased power density by inclusion is a diagram showing a. Seebeck coefficient (Se), ⁇ -CD and the concentration of I 3 - is graph depicting the relationship between the ratio of the concentration.
- Sobeck coefficient a diagram showing the relationship between the concentration of polyethylene glycol 3000 (PEG 3000) (in terms of monomer, mM monomer). It is a figure which shows the relationship between a Seebeck coefficient (Se) and the density
- thermoelectric conversion material of the present invention has a redox couple and a capture compound that selectively captures only one of the redox couples at a low temperature and releases it at a high temperature.
- thermoelectric conversion material refers to a material that directly converts heat into electricity, or electricity directly into heat.
- a device that uses the Seebeck effect, a device that uses the Peltier effect, and the Thomson effect Means a material that can be used in a device or the like using FIG. 1 is a conceptual diagram showing a thermoelectric conversion device including the thermoelectric conversion material of the present invention.
- the capture compound is not particularly limited as long as it is a capture compound that selectively captures only one of the redox pairs at a low temperature and releases it at a high temperature.
- the capture target is confined in the compound.
- polymers such as cyclic compounds and helical compounds that can be used.
- the capture compound can be cooled at low temperature. It may be a compound that self-assembles.
- the cyclic compound is, for example, cyclodextrin
- the helical compound is, for example, starch.
- the capture compound is preferably one or more selected from the group consisting of cyclodextrin, starch, polyvinylpyrrolidone, polyethylene oxide, polyethylene glycol, and the like, and more preferably cyclodextrin.
- the redox pair consists of an oxidant active species and a reducing agent active species.
- the oxidant active species can be reduced to a reducing agent active species by a reduction reaction, or the reducing agent active species can be oxidized to an oxidant active species by an oxidation reaction.
- the redox pair is preferably a pair selected from the group consisting of iodide ions and triiodide ions, and more preferably iodide ions and triiodide ions.
- the thermoelectric conversion material of the present invention contains an ionic electrolyte, and the ionic electrolyte is preferably an ionic liquid, more preferably an aqueous solvent or water containing water and an organic solvent.
- the ionic electrolyte is an aqueous solvent or water
- the redox couple undergoes a redox reaction in the aqueous solvent or water, and the capture compound selectively selects only one of the redox couples in the aqueous solvent or water.
- it is characterized by being captured at a low temperature and released at a high temperature.
- the ionic electrolyte may contain ions other than the redox couple.
- the ionic electrolyte when it is an aqueous solvent or water, it preferably contains an alkali ion. Further, it preferably includes an electrolyte that self-assembles the capture compound at a low temperature.
- the redox couple is an iodide ion and a triiodide ion
- the capture compound is preferably a cyclodextrin capable of capturing a triiodide ion, and more preferably an ⁇ -cyclodextrin.
- the ionic electrolyte is an aqueous solvent or water. It is preferable that the aqueous solvent or water further contains an alkali ion.
- thermoelectric conversion device of the present invention has the above-described thermoelectric conversion material and a pair of electrodes.
- “Thermoelectric conversion device” means a thermoelectric conversion element that can mutually convert thermal energy and electrical energy such as Seebeck element or Peltier element using a thermoelectric conversion material, or a known apparatus using a thermoelectric conversion material.
- the thermoelectric conversion device of the present invention includes, for example, a redox couple, a capture compound that selectively captures only one of the redox couple at a low temperature and releases it at a high temperature, an ionic electrolyte, a first electrode, and a first electrode.
- the electrolyte is in physical contact with at least a part of the surface of the first electrode and at least a part of the surface of the second electrode.
- Capture compound There is no particular limitation as long as the capture compound selectively captures only one of the redox pairs at a low temperature and releases it at a high temperature.
- the capture target may be trapped in the compound. Examples thereof include polymers such as cyclic compounds and helical compounds that can be produced.
- the capture compound is preferably a host compound that forms an inclusion compound by inclusion of the capture target. Further, for example, if the aggregate formed by self-assembly of the capture compound at low temperature can selectively capture only one of the redox pairs at low temperature and release it at high temperature, the capture compound can be cooled at low temperature. It may be a compound that self-assembles.
- the cyclic compound is, for example, cyclodextrin
- the helical compound is, for example, starch, polyvinyl pyrrolidone, polyethylene oxide.
- the host compound is, for example, cyclodextrin, starch, polyvinyl pyrrolidone, polyethylene oxide.
- the capture compound is preferably one or more selected from the group consisting of cyclodextrin, starch, polyvinylpyrrolidone, polyethylene oxide, polyethylene glycol, and the like, and more preferably cyclodextrin.
- cyclodextrins examples include ⁇ -cyclodextrin ( ⁇ -CD), ⁇ -cyclodextrin ( ⁇ -CD), ⁇ -cyclodextrin ( ⁇ -CD), and hexakis- (2,6-di-O-methyl).
- ⁇ -cyclodextrin Di-O-Me- ⁇ -CD
- Tri-O-Me- ⁇ -CD One or two or more compounds selected from the group consisting of: ⁇ -cyclodextrin ( ⁇ -CD), hexakis- (2,6-di-O-methyl) - ⁇ -cyclodextrin (Di-O-Me- ⁇ -CD), and hexakis- (2,3,6- More preferred is one or more compounds selected from the group consisting of tri-O-methyl) - ⁇ -cyclodextrin (Tri-O-Me- ⁇ -CD).
- the redox pair is composed of an oxidant active species and a reducing agent active species.
- the oxidant active species can be reduced to a reducing agent active species by a reduction reaction, or the reducing agent active species can be oxidized to an oxidant active species by an oxidation reaction.
- the redox pairs are iodide ion and triiodide ion, ferrocyanide ion and ferricyanide ion, cobalt trisbipyridine (II) and cobalt trisbipyridine (III), ferrocene monocarboxylic acid (FeII) and ferrocenium monocarboxylic acid.
- a pair selected from the group consisting of acids (FeIII) is preferable, and iodide ion and triiodide ion are more preferable.
- the ionic electrolyte is preferably an ionic liquid or an ionic solid, and more preferably an aqueous solvent containing water and an organic solvent or water.
- the ionic electrolyte is an aqueous solvent or water
- the redox couple undergoes a redox reaction in the aqueous solvent or water, and the capture compound selectively selects only one of the redox couple in the aqueous solvent or water.
- it is characterized by being captured at a low temperature and released at a high temperature.
- the aqueous electrolyte further contains an alkali ion such as potassium.
- first electrode or second electrode Examples of the material of the partial surface portion of the first electrode or the second electrode in contact with the electrolyte include a conductive material such as platinum or carbon, and platinum having a high dissolution potential and excellent corrosion resistance is preferable. Further, carbon such as graphite is preferable from the viewpoint of low production cost and large surface area.
- thermoelectric conversion device for example, in the first electrode, an oxidation reaction in which one reducing agent of the redox pair is changed to the other oxidizing agent occurs, and in the second electrode, A reduction reaction occurs in which the oxidizing agent changes to the reducing agent.
- a power generation device such as a Seebeck element that generates a thermoelectromotive force between the first electrode and the second electrode by causing a temperature difference between the first electrode and the second electrode, and causing a potential difference due to the temperature difference.
- thermoelectric conversion device for example, in the first electrode, an oxidation reaction in which one reducing agent of the redox pair is changed to the other oxidizing agent occurs, and in the second electrode, A reduction reaction occurs in which the oxidizing agent is changed to the reducing agent.
- a potential difference between the first electrode and the second electrode a temperature difference occurs due to the potential difference, and cooling / heating of a Peltier element or the like that causes heat transfer between the first electrode and the second electrode Apparatus.
- thermoelectric conversion device for example, an oxidation reaction of a redox pair occurs in the first electrode on the low temperature side, and a reduction reaction of the redox pair occurs on the second electrode on the high temperature side.
- examples thereof include an n-type Seebeck element in which a trapping compound traps an oxidant active species of the redox pair and generates a thermoelectromotive force between the first electrode and the second electrode.
- the thermoelectric conversion device includes, for example, iodide ions, triiodide ions, cyclodextrin, water or an aqueous solvent, and includes a first electrode on the low temperature side and a high temperature side electrode. A second electrode.
- the aqueous electrolyte is in physical contact with at least part of the surface of the first electrode and at least part of the surface of the second electrode, and at least the material of the electrode surface part in contact with the electrolyte is a conductive material such as platinum or carbon. Material.
- platinum having a high dissolution potential and excellent corrosion resistance is particularly preferable.
- carbon such as graphite is preferable from the viewpoint of low production cost and large surface area.
- the aqueous electrolyte preferably further contains an alkali ion such as potassium.
- thermo-electrochemical cell of the present invention uses the thermoelectric conversion material of the present invention to cause an oxidation-reduction reaction in the first electrode and the second electrode due to a temperature difference between the first electrode and the second electrode.
- the Seebeck element is evaluated by the Seebeck coefficient (Se) represented by the following formula 1.
- ⁇ E is a potential difference between the electrodes
- ⁇ T is a temperature difference
- thermoelectric conversion material provided in the thermochemical battery of the present invention includes a redox couple and a capture compound that selectively captures only one of the redox couple at a low temperature and releases it at a high temperature.
- a redox couple and a capture compound that selectively captures only one of the redox couple at a low temperature and releases it at a high temperature.
- the redox potential (E) of the redox couple is expressed by the standard potential (Ef), the temperature, the oxidant active species concentration ([Ox]) of the redox couple, and the reducing agent active species concentration ([Red]). ).
- the present invention includes a capture compound that selectively captures only one of the redox couples at a low temperature and releases it at a high temperature, so that, for example, oxidation generated by an oxidation reaction in the vicinity of the first electrode on the low temperature side.
- Capture active agent species and reduce oxidant active species concentration ([Ox]) In the vicinity of the high temperature second electrode, the oxidant active species that are the reaction product of the reduction reaction are released, and the oxidant active species concentration ([Ox]) is increased.
- an oxidant active species concentration ([Ox]) difference between the vicinity of the first electrode and the vicinity of the second electrode is generated, and the first electrode is used by using the concentration difference as compared with the conventional temperature difference battery that does not include the trapping compound. And a potential difference between the second electrode and the second electrode.
- thermochemical battery according to the first embodiment of the present invention includes iodide ions, triiodide ions, ⁇ -cyclodextrin, water or an aqueous solvent, and includes a first electrode on the low temperature side and a first electrode on the high temperature side. 2 electrodes.
- I 3 by ⁇ - cyclodextrin - is a conceptual diagram showing that contact selectively packaging a.
- the oxidant active species I 3 ⁇ generated by the oxidation reaction (I ⁇ / I 3 ⁇ ) is captured, and the oxidant active species concentration ([I 3 ⁇ ]) is reduced.
- the oxidant active species that are the reactant of the reduction reaction (I 3 ⁇ / I ⁇ ) are released, and the oxidant active species concentration ([I 3 ⁇ ]) is increased.
- the concentration difference is used in comparison with the conventional temperature difference battery that does not include the trapping compound.
- the potential difference between the first electrode and the second electrode is increased (Formula 3).
- FIG. 3 is a conceptual diagram showing that I 3 ⁇ is selectively included in the vicinity of the first electrode on the low temperature side by adding ⁇ -cyclodextrin ( ⁇ -CD).
- the Seebeck coefficient can be as high as about 2 mV / K, which is three times that before the addition.
- Figure 4 is a Seebeck coefficient (Se), alpha-cyclodextrin added concentration ([ ⁇ -CD] 0) and I 3 - in the doping concentration ([I 3 -] 0) ratio ([ ⁇ -CD] 0 / [I 3 -] 0) is not relevant and inclusion of the I 3 - concentration and [alpha-CD] of 0 / [I 3 -] is a diagram showing the relationship between the 0. As shown in FIG. 4, after [ ⁇ -CD] 0 / [I 3 ⁇ ] 0 > 1, no inclusion is represented by a first electrode (dashed line) at 10 ° C. and a second electrode (solid line) at 40 ° C.
- the solid line in FIG. 4 is the Seebeck coefficient (Se) obtained by simulation using the Nernst equation (5). It was shown that the Seebeck coefficient increased with the concentration difference of I 3 ⁇ .
- thermochemical battery of the second embodiment of the present invention is the same as the thermochemical battery of the first embodiment, except that alkali ions such as potassium ions are further added.
- alkali ions such as potassium ions
- a higher Seebeck coefficient can be obtained.
- K + potassium ion
- near the first electrode resulting dark green precipitate K [( ⁇ -CD) 2 -I 5], 3 - further reduce the concentration of.
- the amount of precipitation near the low temperature side first electrode is larger than the amount of precipitation near the high temperature side second electrode. Expanding the density difference - I 3 due to precipitation.
- FIG. 5 is a conceptual diagram showing that an inclusion compound of ⁇ -cyclodextrin and I 3 ⁇ further self-assembles with potassium ions in a system containing potassium ions.
- FIG. 6 is a diagram showing the complex concentration in a solution of an ⁇ -cyclodextrin / I 3 ⁇ complex evaluated for absorbance at 353 nm. Cold side to ⁇ - cyclodextrin I 3 - in the complex self-assembles to reduce the concentration in the solution.
- Table 2 shows data on the concentration of I 3 ⁇ with and without precipitation from FIG. 6 when the first electrode is 10 ° C. and the second electrode is 40 ° C.
- thermochemical cells of the third and fourth embodiments of the present invention >> [Comparison of effects among ⁇ -CD, ⁇ -CD, and ⁇ -CD]
- the thermochemical cells according to the third and fourth embodiments of the present invention are replaced by ⁇ -cyclodextrin ( ⁇ -CD) and ⁇ -cyclodextrin ( ⁇ -), respectively, instead of ⁇ -cyclodextrin ( ⁇ -CD). Except for using CD), it is the same as the thermochemical battery of the first embodiment.
- ⁇ -cyclodextrin and ⁇ -cyclodextrin do not have the same binding constant as ⁇ -cyclodextrin, but have a certain temperature dependence.
- a thermochemical cell having ⁇ -cyclodextrin and ⁇ -cyclodextrin cannot obtain a Seebeck coefficient (Se) as high as ⁇ -cyclodextrin. However, it shows a higher Seebeck coefficient (Se) than that without cyclodextrin.
- alpha-cyclodextrin, beta-cyclodextrin, .gamma.-cyclodextrin and I 3 - and ion is Arrhenius plot of the binding constant for forming the inclusion compound.
- alpha-as with cyclodextrin when added ⁇ - cyclodextrin ( ⁇ -CD), ⁇ - CD-I 3 - to form a clathrate compound, for example,
- ⁇ -CD cyclodextrin
- ⁇ -CD cyclodextrin
- Se is 1.1 mV / K.
- K + is further added, precipitation occurs and Se is 1.5 mV / K.
- ⁇ -CD-I 3 - to form a clathrate.
- Se is 0.92 mV / K.
- precipitation does not occur even when K + is further added.
- Se is 1.0 mV / K.
- thermochemical battery of the fifth embodiment of the present invention is the same as the thermochemical battery of the first embodiment except that amylose (the main component of starch) is used instead of cyclodextrin. Similarly, the improvement effect of Seebeck coefficient was seen. Amylose, which is the main component of starch, takes in (captures) iodine as shown in FIG. Similarly, amylose (starch) has an effect of improving the Seebeck coefficient.
- FIG. 9 is a graph showing changes in absorbance (observation wavelength: 552 nm) due to iodine-starch complexes. As the temperature increases, the concentration decreases, and as the temperature decreases, the concentration increases. In the thermochemical cell of the fifth embodiment of the present invention, the Seebeck coefficient is increased by the addition of starch as in the first embodiment.
- thermoelectric sensor of the present invention is a device that senses a temperature difference between electrodes by using the thermoelectric conversion materials of the present invention described above. Since the thermoelectric conversion material of the present invention has a high Seebeck coefficient, it has high sensitivity as a temperature sensor.
- thermoelectric conversion device comprising a first and a second platinum electrode using a thermoelectric conversion material containing the aforementioned ⁇ -cyclodextrin, an aqueous solution containing iodide ions, triiodide ions, and potassium ions.
- the thermoelectric sensor which consists of is mentioned.
- thermoelectric sensor In the case of such a thermoelectric sensor, a voltage of 2 mV can be generated even if the temperature difference between the first and second electrodes is only 1 ° C.
- a sensor capable of recognizing a difference of about 0.000001 ° C. can be created by connecting a device for measuring a potential difference such as a highly accurate voltmeter. If such a temperature difference can be recognized, for example, heat transmitted from the body temperature of a person on the other side of the wall can heat one electrode to sense the person. Moreover, the weak infrared rays radiated from the heat source can be detected. Furthermore, when a material capable of generating heat by absorbing specific light such as ultraviolet rays is provided on one electrode side, it can be applied to a thermoelectric sensor that senses a slight amount of light.
- Example 1 ⁇ Preparation of electrolyte> I 2 (317 mg, 1.25 mmol), KI (415 mg, 2.50 mmol) and water were placed in an H-type container having two test tubes as shown in FIG. 10, and [KI 3 ] 50 mM, [KI] A 50 mM solution was prepared. After adding 0.2 mmol of ⁇ -CD (25 mM) to 2.5 ml of the solution, the solution was diluted with an aqueous KI solution to obtain a solution of [KI 3 ] 2.5 mM, [KI] 10 mM, [ ⁇ -CD] 4 mM. It was.
- ⁇ Battery configuration> A platinum wire was inserted into each of the first test tube and the second test tube containing an aqueous solution consisting of [KI 3 ] 2.5 mM, [KI] 10 mM, and [ ⁇ -CD] 4 mM.
- Example 2 is the same as Example 1 except that HCl (0.1 M) is added.
- FIG. 12 is a diagram showing the Seebeck coefficient (solid line) [mV / K] after addition of HCl. Similar to Example 1, from FIG. 12, the Seebeck coefficient (Se) increased from 0.56 mV / K without ⁇ -CD addition to 1.16 after addition. The comparison with Example 1 is also shown in FIG. The activity of I 3 ⁇ / I ⁇ was changed by adding HCl. Se decreased from 1.43 mV / K to 1.16 mV / K when ⁇ -CD was added, and decreased from 0.86 mV / K to 0.56 mV / K when ⁇ -CD was not added.
- FIG. 14 is a diagram in which a change with time in the power density of a battery to which ⁇ -CD and an electrolyte ( ⁇ : HCl) are added is recorded.
- Example 3 is the same as Example 1 except that KCl (0.2M) was added.
- FIG. 15 is a diagram showing the Seebeck coefficient (solid line, mV / K) after the addition of KCl. As in Example 1, in FIG. 15, the Seebeck coefficient (Se) increased from 0.86 mV / K without addition of ⁇ -CD to 1.96 mV / K after addition. FIG. 15 also shows a comparison with Example 1. The activity of I 3 ⁇ / I ⁇ did not change with the addition of KCl. Se increased from 1.43 mV / K to 1.96 mV / K when ⁇ -CD was added, and remained unchanged at 0.86 mV / K when ⁇ -CD was not added.
- Example 3 unlike Examples 1 and 2, dark green precipitate K [( ⁇ -CD) 2 -I 5 ] was observed. Precipitation formation is thought to be responsible for the increase in Seebeck coefficient.
- Example 4 ⁇ Additional effect of ⁇ -CD, ⁇ -CD, ⁇ -CD, Di-O-Me- ⁇ -CD, Tri-O-Me- ⁇ -CD>
- the thermochemical battery of Example 4 was replaced by ⁇ -cyclodextrin ( ⁇ -CD), ⁇ -cyclodextrin ( ⁇ -CD), hexakis- (2,6, respectively, instead of ⁇ -cyclodextrin ( ⁇ -CD).
- thermochemical cell of Example 1 The same as the thermochemical cell of Example 1 except that - ⁇ -CD) is used.
- 19A, 19B, and 19C are graphs showing the relationship between the Seebeck coefficient and the relative concentration of the host molecule.
- the addition concentration of cyclodextrin ([CD] 0 ) is 0 to 5 mM
- the addition concentration of triiodide ions [[ I 3 ⁇ ] 0 ) is 2.5 mM
- iodide ion concentration ([I ⁇ ]) is 10 mM
- potassium chloride concentration (([KCl]) is 0 and 200 mM.
- Se is 1.1 mV / K.
- K + is further added, precipitation occurs and Se is 1.5 mV / K.
- ⁇ - cyclodextrin, ⁇ -CD-I 3 - to form inclusion compounds for example, in the case of 4mM of ⁇ - cyclodextrin, Se is 1.1 mV / K.
- no precipitation occurs.
- FIG. 19D is a graph showing the relationship between the Seebeck coefficient and the concentrations of the five types of host molecules.
- the addition concentration of cyclodextrin ([CD] 0 ) is 0 to 8 mM
- the addition concentration of triiodide ions [I 3 ⁇ ] 0 ) is 2.5 mM
- the iodide ion concentration ([I ⁇ ]) is 10 mM.
- Tri-O-Me- ⁇ -CD-I 3 - Hexakis - (2,3,6-tri -O- methyl)-.alpha.-If the cyclodextrin is added, Tri-O-Me- ⁇ -CD-I 3 - to form a clathrate compound, for example, 4 mM of Tri In the case of —O-Me- ⁇ -CD, Se is 1.85 mV / K.
- FIG. 20 is a current density / power density-voltage curve without the addition of KCl.
- Example 5 is the same as Example 1 except that starch with addition concentrations of 0, 30, and 60 mM (in terms of glu) in terms of glucose was added instead of cyclodextrin.
- the Seebeck coefficient was evaluated, and the relationship between the open circuit voltage (Voc) and the temperature difference between the electrodes after addition of starch with addition concentrations of 0, 30, 60 mM (glu conversion) in terms of glucose was evaluated. Seebeck shown in FIG. The coefficient was obtained.
- Figure 23 is a Seebeck coefficient, starch concentration (six in terms of glucose concentration, 6Gluose) and I 3 - is a diagram showing the relationship between - ([6gluose] / [I 3]) concentration ratio.
- FIG. 24 is a diagram showing the change over time in the power density when 0.2 M of KCl is added in this example in which starch is added. For comparison, the change over time in the power density when 0.2 M of KCl in Example 3 to which ⁇ -cyclodextrin was added was also shown.
- Example 6 In Example 6, the Seebeck coefficient was evaluated in the same manner as in Example 1 except that polyethylene glycol 4000 (manufactured by Kishida Chemical Co., Ltd., average molecular weight: 2,700 to 3,400) (PEG 4000) was added instead of cyclodextrin. It was.
- Figure 26 is a graph showing the relationship between the concentration of the Seebeck coefficient and polyethylene glycol 3000 (in terms of monomer, mM monomer). As shown in FIG. 26, when the addition concentration was 10 mM in terms of monomer, the Seebeck coefficient was 1.35 mV / K.
- Example 7 the Seebeck coefficient was evaluated in the same manner as in Example 1 except that polyvinylpyrrolidone (manufactured by Kishida Chemical Co., Ltd., molecular weight 40,000) (PVP) was added instead of cyclodextrin.
- FIG. 27 is a diagram showing the relationship between the Seebeck coefficient and the concentration of polyvinyl pyrrolidone (monomer equivalent concentration, mM monomer ). When the addition concentration was 20 mM in terms of monomer, the Seebeck coefficient was 1.15 mV / K.
- Example 8 uses ferrocene monocarboxylic acid (FeII) (manufactured by Sigma Aldrich) and its oxidant ferrocenium monocarboxylic acid (FeIII) instead of iodide ion and triiodide ion as a redox pair.
- FeII ferrocene monocarboxylic acid
- FeIII oxidant ferrocenium monocarboxylic acid
- -The Seebeck coefficient was evaluated in the same manner as in Example 1 except that ⁇ -cyclodextrin was added instead of cyclodextrin. As shown in FIG.
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Abstract
Description
本願は、2016年3月9日に、日本に出願された特願2016-046309号に基づき優先権を主張し、その内容をここに援用する。
本発明は以下の[1]~[11]の通りである。
前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出する捕捉化合物と、を有することを特徴とする熱電変換材料。
[2] 前記捕捉化合物が環状化合物、らせん状化合物からなる群から選択された少なくとも1種以上であることを特徴とする[1]に記載の熱電変換材料。
[3] 前記捕捉化合物が低温において自己集合する分子であることを特徴とする[1]または[2]のいずれかに記載の熱電変換材料。
[4] 前記捕捉化合物が包接化合物を形成するホスト化合物であることを特徴とする[1]または[2]のいずれかに記載の熱電変換材料。
[5] 前記捕捉化合物が、シクロデキストリン、デンプン(アミロース)、ポリビニルピロリドン、ポリエチレンオキシドからなる群から選択された1種以上であることを特徴とする[1]または[2]に記載の熱電変換材料。
[6] 前記レドックス対は、ヨウ化物イオンと三ヨウ化物イオン、フェロシアン化物イオンとフェリシアン化物イオン、コバルトトリスビピリジン(II)とコバルトトリスビピリジン(III)からなる群から選択された1対であることを特徴とする[1]~[5]のいずれか一項に記載の熱電変換材料。
[7] 前記捕捉化合物を低温において自己集合させる電解質を更に含むことを特徴とする[1]~[6]のいずれか一項に記載の熱電変換材料。
[8] [1]~[7]のいずれか一項に記載の熱電変換材料と一対の電極と
を備える熱電変換装置。
[9] 前記一対の電極が異なる温度に設定されたことを特徴とする[8]に記載の熱電変換装置。
[10] [8]または[9]に記載の熱電変換装置を含むことを特徴とする熱化学電池。
[11] [8]または[9]に記載の熱電変換装置を含むことを特徴とする熱電センサー。
本発明の熱電変換材料は、レドックス対と、前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出する捕捉化合物と、を有する。なお、本明細書において「熱電変換材料」とは、熱を電気に、または、電気を熱に直接変換する材料をいい、例えば、ゼーベック効果を利用するデバイス、ペルチェ効果を利用するデバイス、トムソン効果を利用するデバイス等において用いることができる材料を意味する。図1は、本発明の熱電変換材料を備える熱電変換装置を示す概念図である。
さらに、前記捕捉化合物を低温において自己集合させる電解質を含むことが好ましい。
前記レドックス対がヨウ化物イオンと三ヨウ化物イオンである場合、捕捉化合物は三ヨウ化物イオンを捕捉することができるシクロデキストリンであることが好ましく、α―シクロデキストリンであることがより好ましい。イオン性電解質が水系溶媒または水であることが好ましい。水系溶媒または水が更にアルカリイオンを含むことが好ましい。
本発明の熱電変換装置は前述の熱電変換材料と一対の電極を有する。なお、「熱電変換装置」とは、熱電変換材料を利用したゼーベック素子やペルチェ素子等の熱エネルギーと電気エネルギーとを相互変換することができる熱電変換素子や、熱電変換材料を利用する公知の装置をすべて含む装置をいう。
本発明の熱電変換装置は、例えば、レドックス対と、前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出する捕捉化合物と、イオン性電解質と、第1電極と第2電極とを備え、かつ、前記電解質は、前記第1電極の少なくとも一部の表面及び第2電極の少なくとも一部の表面と物理的に接触している。
捕捉化合物が、前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出する捕捉化合物であれば特に制限がないが、例えば、捕捉対象を化合物の中に閉じ込むことができる環状化合物、らせん状化合物等の高分子などが挙げられる。また、例えば、捕捉化合物は、捕捉対象を包接して包接化合物を形成するホスト化合物であることが好ましい。また、例えば、前記捕捉化合物が低温において自己集合してからなる集合体が前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出することができれば、前記捕捉化合物が低温において自己集合する化合物であってもよい。その環状化合物は例えばシクロデキストリンであり、そのらせん状化合物は、例えば、デンプン、ポリビニルピロリドン、ポリエチレンオキシドである。また、そのホスト化合物は、例えば、シクロデキストリン、デンプン、ポリビニルピロリドン、ポリエチレンオキシドである。前記捕捉化合物がシクロデキストリン、デンプン、ポリビニルピロリドン、ポリエチレンオキシド、ポリエチレングリコール等からなる群から選択された1種以上であることが好ましく、シクロデキストリンであることがより好ましい。
シクロデキストリンとしては、例えば、α―シクロデキストリン(α-CD)、β-シクロデキストリン(β-CD)、γ-シクロデキストリン(γ-CD)、ヘキサキス‐(2,6-ジ-O-メチル)-α-シクロデキストリン(Di-O-Me-α-CD)、およびヘキサキス‐(2,3,6-トリ-O-メチル)-α-シクロデキストリン(Tri-O-Me-α-CD)からなる群から選択された1つ又は2つ以上の化合物が挙げられる。α―シクロデキストリン(α-CD)、ヘキサキス‐(2,6-ジ-O-メチル)-α-シクロデキストリン(Di-O-Me-α-CD)、およびヘキサキス‐(2,3,6-トリ-O-メチル)-α-シクロデキストリン(Tri-O-Me-α-CD)からなる群から選択された1つ又は2つ以上の化合物がより好ましい。
前記レドックス対は、酸化剤活性種と還元剤活性種とからなる。酸化剤活性種から還元反応で還元剤活性種に還元し、あるいは、還元剤活性種から酸化反応で酸化剤活性種に酸化することができる。前記レドックス対はヨウ化物イオンと三ヨウ化物イオン、フェロシアン化物イオンとフェリシアン化物イオン、コバルトトリスビピリジン(II)とコバルトトリスビピリジン(III)、フェロセンモノカルボン酸(FeII)とフェロセニウムモノカルボン酸(FeIII)からなる群から選択された1対であることが好ましく、より好ましいはヨウ化物イオンと三ヨウ化物イオンである。
イオン性電解質は、イオン液体やイオン性固体であることが好ましく、水と有機溶媒とを含む水系溶媒または水であることがより好ましい。例えば、イオン性電解質が水系溶媒または水である場合、レドックス対が水系溶媒または水において酸化還元反応が起こり、かつ、前記捕捉化合物が、水系溶媒または水において、前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出することを特徴とする。水系電解質が更にカリウムなどのアルカリイオンを含むことが好ましい。
前記電解質に接触している第1電極または第2電極の一部表面部分の材料としては、白金または炭素などの導電材料が挙げられるが、溶解電位が高く耐腐食性が優れた白金が好ましい。また、製造コストが低く表面積が大きい観点から黒鉛などの炭素が好ましい。
本発明の第1の実施態様の熱電変換装置としては、例えば、第1電極において、前記レドックス対の一方の還元剤が他方の酸化剤に変化する酸化反応が起こり、前記第2電極において、前記酸化剤が前記還元剤に変化する還元反応が起こる。第1電極と第2電極の間に温度差が存在し、その温度差に起因して電位差が生じ、前記第1電極と第2電極の間に熱起電力を発生するゼーベック素子などの発電装置が挙げられる。
本発明の第2の実施態様の熱電変換装置としては、例えば、第1電極において、前記レドックス対の一方の還元剤が他方の酸化剤に変化する酸化反応が起こり、前記第2電極において、前記酸化剤を前記還元剤に変化する還元反応が起る。前記第1電極と第2電極の間の電位差が存在し、その電位差に起因して温度差が生じ、前記第1電極と第2電極の間に熱の移動を生じるペルチェ素子などの冷却・加熱装置が挙げられる。
本発明の第3の実施態様の熱電変換装置としては、例えば、低温側の前記第1電極においてレドックス対の酸化反応が起こり、高温側の前記第2電極において前記レドックス対の還元反応が起こる。捕捉化合物が前記レドックス対の酸化剤活性種をトラップし、前記第1電極と第2電極の間に熱起電力を発生させるn-型のゼーベック素子が挙げられる。
本発明の第4の実施態様の熱電変換装置は、例えば、ヨウ化物イオンと三ヨウ化物イオンと、シクロデキストリンと、水または水系溶媒とを備え、かつ、低温側の第1電極と高温側の第2電極とを備える。水系電解質は、第1電極の少なくとも一部の表面及び第2電極の少なくとも一部の表面と物理的に接触し、少なくとも電解液と接触している電極表面部分の材料は白金または炭素などの導電材料である。この中でも溶解電位が高く耐腐食性が優れた白金が特に好ましい。また、製造コストが低く表面積が大きい観点から黒鉛などの炭素が好ましい。
水系電解質としては、更にカリウムなどのアルカリイオンを含むことが好ましい。
本発明の熱化学電池(thermo-electrochemical cell)は、本発明の熱電変換材料を利用して、第1電極と第2電極間の温度差より、第1電極と第2電極において酸化還元反応が起こり、第1電極と第2電極間の電位差を生じるゼーベック素子を備える。
ゼーベック素子は、下記の数式1で示すゼーベック系数(Se)で評価する。
[シクロデキストリンの添加]
本発明の第1実施態様の熱化学電池は、ヨウ化物イオンと三ヨウ化物イオンと、α-シクロデキストリンと、水または水系溶媒とを備え、かつ、低温側の第1電極と高温側の第2電極とを備える。
化学式(1)で表すα-シクロデキストリンによるI3 -の包接は、従来技術に開示されているように、親水的なI-より、疎水的なI3 -を選択的包接する。
図4は、ゼーベック係数(Se)と、α―シクロデキストリン添加濃度([α―CD]0)とI3 -の添加濃度([I3 -]0)の比([α―CD]0/[I3 -]0)との関係及び包接されていないI3 -の濃度と[α―CD]0/[I3 -]0との関係を示す図である。図4に示すように、[α―CD]0/[I3 -]0>1以後、10℃の第1電極(破線)と40℃の第2電極(実線)で表す包接されていないI3 -の濃度の差が大きくなる。
等温滴定型カロリーメトリーより求めたα-CDとI3 -の結合定数を下記表1に示す。温度が30℃上昇した場合、α-CDとI3 -の結合定数が12%減少した。
[支持電解質のゼーベック係数への影響]
本発明の第2実施態様の熱化学電池は、カリウムイオンなどのアルカリイオンを更に添加すること以外は、第1実施態様の熱化学電池と同じである。アルカリイオンの添加により、更に高いゼーベック係数が得られる。
例えば、カリウムイオン(K+)を添加することによって、第1電極付近、暗緑色の沈殿K[(α-CD)2-I5]が生じ、I3 -の濃度をさらに減少させる。低温側第1電極付近の沈殿の量は、高温側第2電極付近の沈澱の量より多い。沈殿生成によるI3 -の濃度差を拡大する。その結果、ゼーベック係数が最大1.96mV/Kに増加する。そのゼーベック係数が得られる理由には、以下の3つがある。(図5)
〔1〕 低温において自己集合(沈殿生成)する。
〔2〕 溶液中の錯体濃度が低くなる。
〔3〕 低温におけるI3 -濃度がさらに低くなる。
[α-CD、β-CD、γ-CDの間で効果を比較]
本発明の第3実施態様と第4実施態様の熱化学電池は、α―シクロデキストリン(α-CD)の代わりに、それぞれ、β-シクロデキストリン(β-CD)、γ-シクロデキストリン(γ-CD)を用いること以外は、第1実施態様の熱化学電池と同じである。
α-シクロデキストリン、β-シクロデキストリン、γ-シクロデキストリンとI3 -イオンと包接化合物を形成する結合定数のアレニウスプロットを、図7に示す。β-シクロデキストリンとγ-シクロデキストリンは、α―シクロデキストリンほどの結合定数がないが、一定の温度依存性がある。
β-シクロデキストリン、γ-シクロデキストリンを有する熱化学電池は、α―シクロデキストリンほど高いゼーベック係数(Se)が得られない。しかし、シクロデキストリンなしのものより、高いゼーベック係数(Se)を示す。
[捕捉化合物にデンプンを使う]
本発明の第5実施態様の熱化学電池は、シクロデキストリンの代わりにアミロース(デンプンの主成分)を用いること以外は、第1実施態様の熱化学電池と同じである。同様にゼーベック係数の向上効果が見られた。
デンプンの主成分であるアミロースは、図8に示すようにヨウ素を取り込む(捕捉する)。
アミロース(デンプン)でも同様にゼーベック係数の向上効果が見られる。
本発明の第5実施態様の熱化学電池は、第1実施態様と同様にデンプンの添加によってゼーベック係数が増加する。
本発明の熱電センサーは、前述の本発明の各熱電変換材料を利用して、電極間の温度差を感知する装置である。本発明の熱電変換材料は、ゼーベック係数が高いので、温度センサーとしての感度が高い。例えば、前述のα―シクロデキストリンと、ヨウ化物イオンと三ヨウ化物イオンと、カリウムイオンとを有する水溶液とを含む熱電変換材料を用いて、さらに第1及び第2白金電極とを備える熱電変換装置からなる熱電センサーが挙げられる。そのような熱電センサーの場合、第1と第2電極間の温度差が1℃だけでも2mVの電圧を生じることができる。精度の良い電圧計等の電位差を測定する装置をつなぐことで、0.000001℃程度の違いを認識できるセンサーを作成できる。この程度の温度差を認識できれば、例えば、壁の向こう側にいる人の体温から伝わる熱が1方の電極を加熱し、人を感知することができる。また、熱源から輻射した微弱な赤外線を感知することができる。さらに、1方の電極側に例えば紫外線等の特定の光を吸収して発熱ができる材料が設けられる場合、わずかな光を感知する熱電センサーに応用することが可能である。
<電解液の調製>
図10に示すような2つの試験管を有するH型容器に、I2(317mg、1.25mmol)とKI(415mg、2.50mmol)と水とを入れ、[KI3]50mM、[KI]50mMの溶液を調整した。その溶液2.5mlに、α-CD(25mM)0.2mmolを添加した後、KI水溶液で希釈し、[KI3]2.5mM、[KI]10mM、[α-CD]4mMの溶液を得た。H型の2つの試験管の第1試験管を氷浴に設置して第1電極付近の温度を10℃に保持し、第2試験管を10~50℃で調整できる恒温槽に設置して第2電極付近の温度を10~50℃に調整した。
[KI3]2.5mM、[KI]10mM、[α-CD]4mMからなる水溶液を含む第1試験管と第2試験管のそれぞれに白金線を挿入した。
図11に示す直線の傾きから、ゼーベック係数を求めた。α-シクロデキストリンを加えるとゼーベック係数が0.86mV/Kから1.43m/Kに増加した。
実施例2は、HCl(0.1M)を添加すること以外は、実施例1と同じである。図12は、HCl添加後のゼーベック係数(実線)[mV/K]を示す図である。実施例1と同様に、図12からゼーベック系数(Se)はα-CD未添加の0.56mV/Kから添加後の1.16に増加した。図12に実施例1との対比も示した。HCl添加により、I3 -/I-の活量が変化した。Seはα-CD添加の場合、1.43mV/Kから1.16mV/Kに減少し、α-CD未添加の場合、0.86mV/Kから0.56mV/Kに減少した。
α-CDの添加により、開放電圧(Voc)の増加と出力電力密度の増加が観測された。
図13がI3 -包接による電力密度の増加(電解質:HCl)を示す図である。
図14はα-CDと電解質(◇:HCl)を加えた電池の電力密度の経時変化を記録した図である。
実施例3は、KCl(0.2M)を添加したこと以外は、実施例1と同じである。図15は、KCl添加後のゼーベック係数(実線、mV/K)を示す図である。実施例1と同様に、図15において、ゼーベック系数(Se)は、α-CD未添加の0.86mV/Kから添加後の1.96mV/Kへと増加した。図15に実施例1との対比も示した。KCl添加により、I3 -/I-の活量が変化しなかった。Seはα-CD添加の場合、1.43mV/Kから1.96mV/Kに増加し、α-CD未添加の場合、0.86mV/Kで変化しなかった。
暗緑色の沈殿物を同定するために、以下の水溶液を調整し、その沈殿物の構造を評価した。水溶液中の各イオン濃度を以下に示した。
[I3 -]0=[I-]0=8mM、
[α-CD]0=4mM、
[KCl]=80mM
上記溶液を2日静置して針状結晶(図16)を得た。その結晶構造は、X線回折装置(XRD)を測定し、その解析結果を図17に示す。
図18に示すように、α-CDの添加により、開放電圧(Voc)の増加と出力電力密度の増加が観測された。
図14は、α-CDと電解質(○:KCl)を加えた電池の電力密度の経時変化を記録した図である。
<α-CD、β-CD、γ-CD、Di-O-Me-α-CD、Tri-O-Me-α-CDの添加効果>
実施例4の熱化学電池は、α―シクロデキストリン(α-CD)の代わりに、それぞれ、β-シクロデキストリン(β-CD)、γ-シクロデキストリン(γ-CD)、ヘキサキス‐(2,6-ジ-O-メチル)-α-シクロデキストリン(Di-O-Me-α-CD)、ヘキサキス‐(2,3,6-トリ-O-メチル)-α-シクロデキストリン(Tri-O-Me-α-CD)を用いること以外は、実施例1の熱化学電池と同じである。
図20は、KCl添加なしの電流密度/電力密度-電圧曲線の図である。溶液の各イオンの濃度は以下である。
×: [CD]=0mM
[I3 -]=2.5mM
[I-]=10mM
◇:γ-CD添加
△:β-CD添加
○:α-CD添加
実線:電力密度-電圧曲線
破線:電流密度-電圧曲線
×:[CD]=0mM
[I3 -]=2.5mM
[I-]=10mM
[KCl]=200mM
▽:[CD]=0mM
[I3 -]=50mM
[I-]=50mM
△:×にβ-CD添加
○:×にα-CD添加
実線:電力密度-電圧曲線
破線:電流密度-電圧曲線
実施例5はシクロデキストリンの代わりに添加濃度がグルコース換算で0、30、60mM(glu換算)のデンプンを添加した以外は、実施例1と同様である。ゼーベック係数の評価を行い、添加濃度がグルコース換算で0、30、60mM(glu換算)のデンプンを添加後開放電圧(Voc)と電極間の温度差との関係を評価し、図22に示すゼーベック係数を求めた。
図24は、デンプン添加する本実施例におけるKClを0.2M加えた場合の電力密度の経時変化を示す図である。対比するために、α―シクロデキストリンを添加した実施例3におけるKClを0.2M加えた場合の電力密度の経時変化も併記した。
実施例6はシクロデキストリンの代わりにポリエチレングリコール4000(キシダ化学株式会社製、平均分子量は2,700~3,400)(PEG4000)添加した以外に、実施例1と同様にゼーベック係数の評価を行った。図26はゼーベック係数とポリエチレングリコール3000の濃度(モノマー換算、mMmonomer)との関係を示す図である。図26に示すように添加濃度がモノマー換算で10mMである場合、ゼーベック係数が1.35mV/Kであった。
実施例7はシクロデキストリンの代わりにポリビニルピロリドン(キシダ化学株式会社製、分子量40,000)(PVP)添加した以外に、実施例1と同様にゼーベック係数の評価を行った。図27はゼーベック係数とポリビニルピロリドンの濃度(モノマー換算濃度、mMmonomer)との関係を示す図である。添加濃度がモノマー換算で20mMである場合、ゼーベック係数が1.15mV/Kであった。
実施例8はレドックス対としてヨウ化物イオンと三ヨウ化物イオンの代わりにフェロセンモノカルボン酸(FeII)(シグマアルドリッチ社製)とその酸化体であるフェロセニウムモノカルボン酸(FeIII)を用い、α―シクロデキストリンの代わりにβ―シクロデキストリンを添加した以外に、実施例1と同様にゼーベック係数の評価を行った。図27に示すように、β―シクロデキストリンなしおよびβ―シクロデキストリンを2.0mM添加した開放電圧(Voc)と電極間の温度差(ΔT)との関係を評価し、それぞれのゼーベック係数が-0.98と-1.20mV/Kであった。β―シクロデキストリンが還元体のフェロセンモノカルボン酸(FeII)を選択的に補足することが確認された。
Claims (11)
- レドックス対と、
前記レドックス対の一方のみを選択的に、低温で捕捉し、かつ、高温で放出する捕捉化合物と、を有することを特徴とする熱電変換材料。 - 前記捕捉化合物が環状化合物、らせん状化合物からなる群から選択された少なくとも1種以上であることを特徴とする請求項1に記載の熱電変換材料。
- 前記捕捉化合物が低温において自己集合する分子であることを特徴とする請求項1または2のいずれかに記載の熱電変換材料。
- 前記捕捉化合物が包接化合物を形成するホスト化合物であることを特徴とする請求項1または2のいずれかに記載の熱電変換材料。
- 前記捕捉化合物が、シクロデキストリン、デンプン、ポリビニルピロリドン、ポリエチレンオキシドからなる群から選択された1種以上であることを特徴とする請求項1または2に記載の熱電変換材料。
- 前記レドックス対は、ヨウ化物イオンと三ヨウ化物イオン、フェロシアン化物イオンとフェリシアン化物イオン、コバルトトリスビピリジン(II)とコバルトトリスビピリジン(III)からなる群から選択された1対であることを特徴とする請求項1~5のいずれか一項に記載の熱電変換材料。
- 前記捕捉化合物を低温において自己集合させる電解質を更に含むことを特徴とする請求項1~6のいずれか一項に記載の熱電変換材料。
- 請求項1~7のいずれか一項に記載の熱電変換材料と一対の電極と
を備える熱電変換装置。 - 前記一対の電極が異なる温度に設定されたことを特徴とする請求項8に記載の熱電変換装置。
- 請求項8または9に記載の熱電変換装置を含むことを特徴とする熱化学電池。
- 請求項8または9に記載の熱電変換装置を含むことを特徴とする熱電センサー。
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JP2018504591A JP6511708B2 (ja) | 2016-03-09 | 2017-03-09 | 熱電変換材料とそれを有する熱電変換装置、熱化学電池及び熱電センサー |
US16/082,476 US11367824B2 (en) | 2016-03-09 | 2017-03-09 | Thermoelectric conversion material, thermoelectric conversion device having the same, thermo-electrochemical cell and thermoelectric sensor |
EP17763386.4A EP3428984A4 (en) | 2016-03-09 | 2017-03-09 | THERMOELECTRIC CONVERSION MATERIAL, THERMOELECTRIC CONVERSION DEVICE, THERMOCHEMICAL BATTERY AND THERMOELECTRIC SENSOR WITH THIS MATERIAL |
CN201780015254.2A CN108780837B (zh) | 2016-03-09 | 2017-03-09 | 热电转换材料、具有该热电转换材料的热电转换装置、热化学电池、以及热电传感器 |
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JP2020106385A (ja) * | 2018-12-27 | 2020-07-09 | 国立大学法人東北大学 | 温度センサ及びその製造方法 |
WO2021235526A1 (ja) * | 2020-05-21 | 2021-11-25 | デンカ株式会社 | 熱電変換用n型材料及びその製造方法、ドーパント並びに熱電変換素子 |
CN114204061A (zh) * | 2021-11-19 | 2022-03-18 | 华中科技大学 | 一种热化学电池及器件 |
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CN112713233B (zh) * | 2019-10-25 | 2023-09-26 | 南方科技大学 | 准固态离子型热电转换材料、热电转换器件及其应用 |
ES2934182B2 (es) * | 2021-07-20 | 2023-12-11 | Univ Jaume I | Dispositivo termoelectrico influenciado por especies redox |
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CN108780837A (zh) | 2018-11-09 |
JPWO2017155046A1 (ja) | 2018-11-22 |
US20190081224A1 (en) | 2019-03-14 |
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