CN110571438A - Air cathode for microbial fuel cell and microbial fuel cell - Google Patents
Air cathode for microbial fuel cell and microbial fuel cell Download PDFInfo
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- CN110571438A CN110571438A CN201910837091.7A CN201910837091A CN110571438A CN 110571438 A CN110571438 A CN 110571438A CN 201910837091 A CN201910837091 A CN 201910837091A CN 110571438 A CN110571438 A CN 110571438A
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- 239000000446 fuel Substances 0.000 title claims abstract description 48
- 230000000813 microbial effect Effects 0.000 title claims abstract description 48
- 239000000919 ceramic Substances 0.000 claims abstract description 34
- 239000000017 hydrogel Substances 0.000 claims abstract description 29
- 239000002250 absorbent Substances 0.000 claims abstract description 17
- 239000010865 sewage Substances 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 239000002351 wastewater Substances 0.000 claims description 7
- 229920001817 Agar Polymers 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 244000005700 microbiome Species 0.000 claims description 6
- 239000008272 agar Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims 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 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 239000008103 glucose Substances 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 210000002700 urine Anatomy 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000370 acceptor Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8684—Negative electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Fuel Cell (AREA)
Abstract
The invention provides an air cathode for a microbial fuel cell and the microbial fuel cell, and relates to the technical field of microbial fuel cells. Wherein the cathode comprises a tubular column with an open top, and a water-absorbent hydrogel and an electrically conductive porous ceramic ring disposed inside the tubular column; the pipe column comprises an upper half part and a lower half part, and the pipe wall of the lower half part is provided with a plurality of first small holes; the water-absorbing hydrogel is filled in the pipe column, and the conductive porous ceramic ring is positioned at the upper half part and is surrounded by the water-absorbing hydrogel; the wire is wound around the conductive porous ceramic ring and passes through the intermediate passage of the conductive porous ceramic and extends out of the opening of the tubing string. The air cathode for the microbial fuel cell and the microbial fuel cell provided by the invention have the advantages of simple structure, low cost and simple preparation method, and are suitable for popularization and use.
Description
Technical Field
The invention relates to the technical field of microbial fuel cells, in particular to an air cathode for a microbial fuel cell and the microbial fuel cell.
Background
Microbial Fuel Cells (MFCs) are energy converters that convert organic matter directly into electrical energy, and are used for sewage treatment to achieve the dual functions of wastewater treatment and electrical energy regeneration. In recent years, with the progress of research in this field, air cathode microbial fuel cells have been mainly used, and oxygen which is not an absolute source of oxygen in the atmosphere can be supplied, so that the air cathode microbial fuel cells have high redox characteristics and are suitable as the most common electron acceptors for cathodes. However, most of the existing air cathode microbial fuel cells use Nafion material as proton membrane, which is disadvantageous in that the cost is too high to limit the wide application range. Another type of MFC system is a self-layering membraneless microbial fuel cell (SSM-MFC), where the cathode still uses oxygen as the electron acceptor and the system is placed on top and the anode on the bottom, thus reducing cost and complexity and power density loss.
However, the current problems of low output power density and high raw material cost of the microbial fuel cell limit the wide applicability. Although a plurality of electrode materials such as graphite, carbon felt, carbon paper and the like can be selected at present, the problems of poor performance, complex preparation method, high cost and the like generally exist, and the large-scale application is limited.
Disclosure of Invention
The invention provides an air cathode for a microbial fuel cell and the microbial fuel cell, and aims to provide an electrode material which is low in cost, simple to prepare and high in performance, and is beneficial to further popularization and use of the microbial fuel cell.
In order to solve the technical problem, the invention provides an air cathode for a microbial fuel cell, which comprises a tubular column with an open top, water-absorbing hydrogel and a conductive porous ceramic ring, wherein the water-absorbing hydrogel and the conductive porous ceramic ring are arranged inside the tubular column; the pipe column comprises an upper half part and a lower half part, and the pipe wall of the lower half part is provided with a plurality of first small holes; the water-absorbent hydrogel is filled in the column, and the conductive porous ceramic ring is positioned in the upper half part and is surrounded by the water-absorbent hydrogel; a wire is wound around the conductive porous ceramic ring and passes through the central passage of the conductive porous ceramic ring and extends out of the opening of the tubing string.
as a further optimization, the cathode further comprises a first top cover provided with a plurality of second small holes, the first top cover is used for covering the top opening of the pipe column, and the lead can pass through the second small holes; the tubular column is cylindrical.
As a further optimization, the diameter of the first small hole is 0.5-8 mm; the diameter of the second small hole is 0.1-3 mm.
As a further optimization, the water-absorbing hydrogel is one or more of agar, polyacrylate, sodium polyacrylate and polyvinyl alcohol.
As a further optimization, the water-absorbing hydrogel is polyvinyl alcohol with the concentration of 5% -15%; wherein the polyvinyl alcohol is frozen at a low temperature of-20-0 ℃, then unfrozen at a normal temperature of 18-40 ℃, and the freezing/unfreezing steps are repeated for 1-3 times to obtain the water-absorbent hydrogel.
As a further optimization, the conductive porous ceramic ring is formed by soaking the porous ceramic ring in an organic solution, concentrating the organic solution into a viscous state at 100-250 ℃, drying and calcining at 700-1500 ℃.
As a further optimization, the organic solution is one or more of glucose solution, urine and food concentrated wastewater.
the invention also provides a microbial fuel cell, which comprises an anode, a lead, a container, a resistance element and the air cathode;
The top of the container is provided with an opening, a second top cover used for covering the opening and a chamber, and the chamber is used for containing microorganisms and organic sewage; the anode is arranged in the cavity and is immersed in the organic sewage; the second top cover is provided with a through hole matched with the air cathode in shape, the air cathode is vertically arranged, the lower half part of the air cathode is immersed in the organic sewage, and the upper half part of the air cathode is clamped in the through hole and used for fixing the air cathode; the resistance element is arranged outside the cavity and is electrically connected with the anode and the cathode through the conducting wires.
As a further optimization, the anode is carbon fiber cloth.
Preferably, the resistor element is a fixed resistor, a variable resistor or a low-power small-sized electric appliance.
By adopting the technical scheme, the invention can obtain the following technical effects:
The invention provides an air cathode for a microbial fuel cell and the microbial fuel cell, wherein a hollow tubular column is used as a support frame of the air cathode, a first small hole is arranged at the lower half part of the tubular column, water-absorbing hydrogel is added to be used as an isolating layer, and meanwhile, in the upper layer of the water-absorbing hydrogel, a conductive porous carbonized ceramic ring is used as a cathode, so that the structure of the air cathode microbial fuel cell is simplified, the cost of the microbial fuel cell can be reduced, the preparation method is simple, and the microbial fuel cell is suitable for popularization and use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of an air cathode for a microbial fuel cell according to a first embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a microbial fuel cell according to a second embodiment of the present invention.
The labels in the figure are: 1-a cathode; 11-a column; 111-upper half; 112-lower half; 113-a first orifice; 12-a hydrogel; 13-a conductive porous ceramic ring; 14-a first cap; 141-a second aperture; 2-an anode; 21-a gasket; 3-a wire; 4-a resistive element; 5-a container; 51-a second top cover; 52-water level; 53-Chamber.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
As shown in fig. 1, a first embodiment of the present invention provides an air cathode for a microbial fuel cell, comprising a column 11 having an open top, and a water-absorbent hydrogel 12 and an electrically conductive porous ceramic ring 13 disposed inside the column 11. The pipe column 11 comprises an upper half part 111 and a lower half part 112, and the pipe wall of the lower half part 112 is provided with a plurality of first small holes 113; the water-absorbent hydrogel 12 is filled inside the column 11, and the electrically conductive porous ceramic ring 13 is located in the upper half 111 and surrounded by the water-absorbent hydrogel 12. The wire 3 is wound around the conductive porous ceramic ring 13 and passes through the central passage of the conductive porous ceramic ring 13 and extends out of the opening of the column 11. The water-absorbing hydrogel 12 is used as an isolation layer for isolating organic sewage and microorganisms in the environment where the air cathode 1 is located from entering the cathode 1, and the water-absorbing hydrogel 12 has water-absorbing performance capable of absorbing water generated by the reduction reaction of the cathode 1, guiding the water to the lower half part 112 of the column 11, and discharging the water to the environment where the air cathode 1 is located through the first small hole 113 of the lower half part 112 of the column 11. The conductive porous ceramic ring 13 can accelerate the reduction speed of oxygen at the cathode 1, and improve the productivity and efficiency of the whole device. It should be noted that the lead 3 may be a titanium wire or a copper wire having a conductive property. More preferably, the lead 3 is a titanium wire, so that the electric conductivity is strong and the conduction effect is good. The parts of the wires 3 which are not positioned in the pipe column 11 are coated with a heat shrinkage film for protecting and insulating the wires 3.
As a further optimization, the cathode 1 further includes a first top cover 14 provided with a plurality of second small holes 141, and is used for covering the top opening of the pipe column 11, and the lead 3 can pass through the second small holes 141; the pipe string 11 is cylindrical. The cylindrical pipe column 11 is easier to set, and a top cover provided with the second small hole 141 is added to the pipe column 11, so that firstly, the substances in the pipe column 11 can not be easily poured out, and secondly, the second small hole 141 is ensured to be left to allow the lead 3 and oxygen to enter the cathode 1.
As a further optimization, the material of the pipe column 11 can be made of hard plastics, and the material is more easily available and low in price.
as a further optimization, the diameter of the first small hole 113 is 0.5-8mm, which is convenient for discharging the water generated by the cathode 1; the diameter of the second small hole 141 is 0.1-3mm, so that the lead 3 can be led out conveniently.
As a further optimization, the water-absorbent hydrogel 12 is one or more of agar, polyacrylate, sodium polyacrylate and polyvinyl alcohol. The agar used is generally an agar gel prepared from an agar solution having a concentration of 1% to 5%.
Preferably, in a preferred embodiment of the present invention, the water-absorbent hydrogel 12 is polyvinyl alcohol with a concentration of 5% to 15%. Wherein the polyvinyl alcohol is frozen at a low temperature of-20 ℃ to 0 ℃ and then thawed at a normal temperature of 18 ℃ to 40 ℃, and the steps of freezing/thawing are repeated for 1 to 3 times to obtain the water-absorbent hydrogel 12. The water-absorbent gel obtained in this way has a good water absorption effect and does not dissolve in water, and can also provide support for the conductive porous ceramic ring 13 of the upper half 111.
As a further optimization, the conductive porous ceramic ring 13 is formed by soaking the porous ceramic ring in an organic solution, concentrating the organic solution into a viscous state at 100-250 ℃, drying, and calcining at 700-1500 ℃. After the organic solution is concentrated into a viscous state, the organic solution can be effectively wrapped on the surfaces of the porous ceramic rings and the surfaces of the holes, and then the organic solution is dried and then calcined, so that the organic solution is subjected to progressive carbonization, the surfaces of the porous ceramic rings and the surfaces of the holes are modified to have conductive porous carbon structures, more reaction sites are provided for oxygen, the redox reaction of the cathode 1 is accelerated, and the productivity and efficiency are improved. It should be noted that the conductive porous ceramic ring 13 provided by the present invention is usable with an electrical resistance of less than 1000 Ω.
As a further optimization, the organic solution is one or more of glucose solution, urine and food concentrated wastewater, as long as the organic solution contains carbon element and can be carbonized.
As a further optimization, in a preferred embodiment of the present invention, as shown in fig. 1, a plurality of the conductive porous ceramic rings 13 are disposed inside the column 11 and are vertically arranged, so as to provide more reaction sites for oxygen, further accelerate the redox reaction of the cathode 1, and improve the productivity and efficiency.
Referring to fig. 2, a second embodiment of the present invention provides a microbial fuel cell, which includes an anode, a lead 3, a container 5, a resistive element 4, and an air cathode 1 in the first embodiment.
Wherein, the top of the container 5 is provided with an opening, a second top cover 51 for covering the opening and a chamber 53, and the chamber 53 is used for containing microorganisms and organic sewage; the anode is disposed within the chamber 53 and submerged in the organic wastewater; the second top cover 51 is provided with a through hole matched with the air cathode 1 in shape, the air cathode 1 is vertically arranged, the lower half part 112 is immersed in the organic sewage, and the upper half part 111 is clamped in the through hole to fix the air cathode 1; the resistance element 4 is disposed outside the chamber 53 and electrically connected to the anode and the cathode 1 through the lead 3.
In this embodiment, the wires 3 are electrically connected to the anode, the cathode 1 and the resistor as shown in fig. 2, and after the microorganisms in the chamber 53 react with the organic wastewater for several days, electric energy is generated and power is supplied to the low-power small-sized electric appliance. This is because, in the anaerobic environment of the chamber 53, the organic substances in the organic wastewater are decomposed by the action of microorganisms to release electrons and protons, the electrons are efficiently transferred between the biological components and the anode by means of a suitable electron transfer mediator and are transferred to the cathode 1 through the lead 3 to form an electric current, which supplies the resistance element 4 with electric power, and the protons are transferred to the cathode 1 to react with the electron acceptor (oxygen) to form water. It should be noted that, after the microbial fuel cell provided in this embodiment operates for several days, the output voltage is between 0.5V and 1.0V, and the voltage can be increased by a series connection manner, or the current can be increased by a parallel connection manner, or the voltage, the current, and the power required by the low-power electrical appliance can be increased by a series-parallel connection manner to start the electrical appliance, which can be actually used as a power supply source of the low-power electrical appliance.
As a further optimization, the level 52 of the organic wastewater filled in the container 5 must not exceed the conductive porous carbonized ceramic ring; the water level 52 of the container 5 is thus limited to a height of 0.5-5cm from the conductive porous carbonized ceramic ring for ensuring proper operation of the cathode 1.
As a further optimization, the anode is carbon fiber cloth. The carbon fiber of the carbon fiber cloth can better transmit current. After the carbon fiber cloth is wound and connected with the lead 3, the lead 3 is led out of the container 5 through a through hole formed in the second top cover 51 and the high-density columnar gasket 21 fixed on the second top cover 51, and then the periphery of the lead 3 positioned outside the container 5 is coated with a thermal shrinkage film for insulating the lead 3.
As a further optimization, the container 5 may be a plastic bottle, a pet bottle, a glass bottle, an aluminum can, an iron can, a test tube, a pottery can, etc., but this is not limiting, and the shape, size, and material of the container 5 are not limited.
As a further optimization, the resistance element 4 is a fixed resistance, a variable resistance or a low power small electric appliance. Wherein the low-power small-sized electric appliance is a timer, a small-sized alarm clock, a small-sized motor, a small-sized bulb and the like.
The invention provides an air cathode for a microbial fuel cell and the microbial fuel cell, wherein a hollow tubular column 11 is used as a support frame of the air cathode 1, a first small hole 113 is arranged on the lower half part 112 of the tubular column 11, water-absorbing hydrogel 12 is added to be used as an isolating layer, and meanwhile, in the upper layer of the water-absorbing hydrogel 12, a conductive porous carbonized ceramic ring is used as the cathode 1, so that the structure of the air cathode microbial fuel cell is simplified, the cost of the microbial fuel cell is low, the preparation method is simple, and the microbial fuel cell is suitable for popularization and use.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An air cathode for a microbial fuel cell comprising a tubular column having an open top and a water-absorbent hydrogel and an electrically conductive porous ceramic ring disposed inside the tubular column; the pipe column comprises an upper half part and a lower half part, and the pipe wall of the lower half part is provided with a plurality of first small holes; the water-absorbent hydrogel is filled in the column, and the conductive porous ceramic ring is positioned in the upper half part and is surrounded by the water-absorbent hydrogel; a wire is wound around the conductive porous ceramic ring and passes through the central passage of the conductive porous ceramic ring and extends out of the opening of the tubing string.
2. The air cathode for a microbial fuel cell according to claim 1, wherein the cathode further comprises a first top cap having a plurality of second holes for covering the top opening of the tubular column, the lead wire being capable of passing through the second holes; the tubular column is cylindrical.
3. The air cathode for a microbial fuel cell according to claim 2, wherein the diameter of the first small hole is 0.5 to 8 mm; the diameter of the second small hole is 0.1-3 mm.
4. The air cathode for a microbial fuel cell according to claim 1, wherein the water-absorbent hydrogel is one or more of agar, polyacrylate, sodium polyacrylate, and polyvinyl alcohol.
5. The air cathode for a microbial fuel cell according to claim 4, wherein the water-absorbent hydrogel is polyvinyl alcohol at a concentration of 5% to 15%; wherein the polyvinyl alcohol is frozen at a low temperature of-20-0 ℃, then unfrozen at a normal temperature of 18-40 ℃, and the freezing/unfreezing steps are repeated for 1-3 times to obtain the water-absorbent hydrogel.
6. The air cathode for a microbial fuel cell according to claim 1, wherein the conductive porous ceramic ring is formed by immersing a porous ceramic ring in an organic solution, concentrating the organic solution into a viscous state at 100 to 250 ℃, drying, and calcining at a high temperature of 700 to 1500 ℃.
7. The air cathode for a microbial fuel cell according to claim 6, wherein the organic solution is one or more of glucose solution, urine, and food concentrate wastewater.
8. A microbial fuel cell comprising an anode, a lead, a container, a resistive element, and an air cathode according to any one of claims 1 to 7;
The top of the container is provided with an opening, a second top cover used for covering the opening and a chamber, and the chamber is used for containing microorganisms and organic sewage; the anode is arranged in the cavity and is immersed in the organic sewage; the second top cover is provided with a through hole matched with the air cathode in shape, the air cathode is vertically arranged, the lower half part of the air cathode is immersed in the organic sewage, and the upper half part of the air cathode is clamped in the through hole and used for fixing the air cathode; the resistance element is arranged outside the cavity and is electrically connected with the anode and the cathode through the conducting wires.
9. The microbial fuel cell of claim 8, wherein the anode is carbon fiber cloth.
10. The microbial fuel cell of claim 8, wherein the resistive element is a fixed resistance, a variable resistance, or a low power, miniature electrical appliance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910837091.7A CN110571438A (en) | 2019-09-05 | 2019-09-05 | Air cathode for microbial fuel cell and microbial fuel cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910837091.7A CN110571438A (en) | 2019-09-05 | 2019-09-05 | Air cathode for microbial fuel cell and microbial fuel cell |
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| Publication Number | Publication Date |
|---|---|
| CN110571438A true CN110571438A (en) | 2019-12-13 |
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|---|---|---|---|
| CN201910837091.7A Pending CN110571438A (en) | 2019-09-05 | 2019-09-05 | Air cathode for microbial fuel cell and microbial fuel cell |
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| CN (1) | CN110571438A (en) |
Cited By (2)
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