WO2018212007A1 - 電気化学的にゲルマンを製造する方法 - Google Patents

電気化学的にゲルマンを製造する方法 Download PDF

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Publication number
WO2018212007A1
WO2018212007A1 PCT/JP2018/017649 JP2018017649W WO2018212007A1 WO 2018212007 A1 WO2018212007 A1 WO 2018212007A1 JP 2018017649 W JP2018017649 W JP 2018017649W WO 2018212007 A1 WO2018212007 A1 WO 2018212007A1
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WO
WIPO (PCT)
Prior art keywords
cathode
geh
germane
electrolytic solution
anode
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PCT/JP2018/017649
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English (en)
French (fr)
Japanese (ja)
Inventor
鈴木　淳
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昭和電工株式会社
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Publication date
Application filed by 昭和電工株式会社 filed Critical 昭和電工株式会社
Priority to KR1020197034666A priority Critical patent/KR20190140026A/ko
Priority to CN201880031311.0A priority patent/CN110621810A/zh
Priority to JP2019519183A priority patent/JP7110185B2/ja
Publication of WO2018212007A1 publication Critical patent/WO2018212007A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms

Definitions

  • the present invention relates to a method for producing germane electrochemically.
  • germane As a raw material for producing the SiGe substrate, germane (GeH 4 ) is used, and it is expected that the amount of GeH 4 used will increase as the use of the SiGe substrate increases.
  • Patent Document 1 describes that GeH 4 can be produced electrochemically with high current efficiency by using a Cu alloy or Sn alloy as a cathode. ing.
  • Non-Patent Document 1 discloses that as a result of screening Pt, Zn, Ti, graphite, Cu, Ni, Cd, Pb, and Sn as cathodes used when electrochemically producing GeH 4 , Cd or Cu is present. It describes that it was optimal in terms of current efficiency and contamination.
  • Non-Patent Document 2 As a result of investigating a plurality of cathodes as cathodes used when electrochemically producing GeH 4 , the hydrogenation rate was 99% or more when Hg was used as the cathode. It is disclosed.
  • the conventional method for electrochemically producing GeH 4 as described in the above-mentioned document is, for example, that the cathode (bronze manufactured by McMaster-Carr) used in the example of Patent Document 1 is plated or coated.
  • GeH 4 is industrially produced because it is difficult to apply a method such that an effective element exists only on the surface, and the toxicity of the cathode (Hg) used in Non-Patent Document 2 is high. It was unsuitable as a method.
  • One embodiment of the present invention provides an industrially advantageous method for producing GeH 4 electrochemically.
  • a configuration example of the present invention is as follows.
  • a method for producing germane electrochemically by energizing an electrolytic solution containing a germanium compound in an electrochemical cell having a diaphragm, an anode and a cathode containing silver to generate germane at the cathode.
  • the electrolytic solution is an electrolytic solution containing germanium dioxide and an ionic substance.
  • the ionic substance is potassium hydroxide or sodium hydroxide.
  • GeH 4 can be produced electrochemically in an industrially advantageous manner, particularly with high current efficiency.
  • FIG. 1 is a schematic diagram of the apparatus used in the examples.
  • An electrochemical method for producing GeH 4 according to an embodiment of the present invention includes a germanium compound in an electrochemical cell having a diaphragm, an anode, and a cathode including silver.
  • the electrolytic solution is energized to generate GeH 4 at the cathode to produce GeH 4 electrochemically.
  • GeH 4 can be produced electrochemically with an industrially advantageous method, particularly with high current efficiency. Therefore, by using GeH 4 obtained by this method, the SiGe substrate can be produced industrially advantageously.
  • Such industrial reactions include, for example, reactions on a scale such that the electrolyte capacity is 500 to 2500 L, the number of cells is 30 to 150, and the current used is 100 to 300 A.
  • GeH 4 can be produced with a current efficiency of preferably 10 to 90%, more preferably 12 to 40%.
  • the said current efficiency can be specifically measured by the method as described in the following Example.
  • the electrochemical cell is not particularly limited as long as it has a diaphragm, an anode, and the cathode, and a conventionally known cell can be used.
  • Specific examples of the cell include a cell in which an anode chamber including an anode and a cathode chamber including a cathode are separated using a diaphragm.
  • the cathode is not particularly limited as long as it contains Ag.
  • the cathode may be an electrode made of metal Ag, an electrode made of an Ag-based alloy containing Ag as a main component, or an electrode plated or coated with metal Ag or an Ag alloy.
  • Examples of the plated or coated electrode include an electrode obtained by plating or coating a metal Ag or an Ag alloy on a substrate such as Ni.
  • metal Ag is expensive, it is preferably an electrode plated or coated with metal Ag or an Ag alloy from the viewpoint of cost.
  • the shape of the cathode is not particularly limited, and may be any of a plate shape, a column shape, a hollow shape, and the like. Further, the size, surface area, etc. of the cathode are not particularly limited.
  • the anode is not particularly limited, and an anode conventionally used in electrochemical production of GeH 4 may be used.
  • An electrode made of a conductive metal such as Ni and Pt, and the conductive metal may be used.
  • An electrode made of an alloy containing the main component is preferable, and an electrode made of Ni is preferable from the viewpoint of cost.
  • the anode may be an electrode plated or coated with the conductive metal or an alloy containing the metal, as with the cathode.
  • the shape, size, surface area, etc. of the anode are not particularly limited as in the case of the cathode.
  • the diaphragm is not particularly limited, and a diaphragm that has been conventionally used in electrochemical cells and that can separate the anode chamber and the cathode chamber may be used.
  • various electrolyte membranes and porous membranes can be used.
  • the electrolyte membrane include polymer electrolyte membranes such as ion exchange solid polymer electrolyte membranes, specifically NAFION (registered trademark) 115, 117, NRE-212 (manufactured by Sigma-Aldrich).
  • the porous film porous ceramics such as porous glass, porous alumina and porous titania, porous polymers such as porous polyethylene and porous propylene, and the like can be used.
  • the electrochemical cell is divided into an anode chamber and a cathode chamber by the diaphragm, the O 2 gas generated at the anode and the GeH 4 generated at the cathode are not mixed, and the respective electrode chambers are mixed. It can be taken out from an independent outlet.
  • O 2 gas and GeH 4 are mixed, the O 2 gas and GeH 4 react with each other and the yield of GeH 4 tends to decrease.
  • GeH 4 is produced from an electrolytic solution containing a germanium compound.
  • the electrolytic solution is preferably an aqueous solution.
  • GeO 2 is preferable.
  • concentration be saturated with respect to the solvent, preferably water.
  • the electrolytic solution preferably contains an ionic substance in order to improve the conductivity of the electrolytic solution and promote the solubility of GeO 2 in water.
  • an ionic substance a conventionally known ionic substance used in electrochemistry can be used, but KOH or NaOH is preferable from the viewpoint of excellent effects. Among these, KOH is preferable because KOH aqueous solution is more excellent in conductivity than NaOH aqueous solution.
  • the concentration of KOH in the electrolytic solution is preferably 1 to 8 mol / L, more preferably 2 to 5 mol / L.
  • concentration of KOH is within the above range, an electrolytic solution having a high GeO 2 concentration can be easily obtained, and GeH 4 can be efficiently produced with high current efficiency.
  • concentration of KOH is less than the lower limit of the above range, the conductivity of the electrolyte solution tends to be low, a high voltage may be required for the production of GeH 4 , and the dissolved amount of GeO 2 in water Tends to decrease, and the reaction efficiency may decrease.
  • concentration of KOH exceeds the upper limit of the above range, a material having high corrosion resistance tends to be required as the material of the electrode or cell, which may increase the cost of the apparatus.
  • the magnitude of the current per unit area (current density) of the cathode when producing GeH 4 (when the current is applied) is excellent in the reaction rate, and can produce GeH 4 with high current efficiency. Therefore, it is preferably 30 to 500 mA / cm 2 , more preferably 50 to 400 mA / cm 2 .
  • the current density is in the above range, the amount of hydrogen gas generated by electrolysis of water can be appropriately controlled without reducing the generation rate of GeH 4 per unit time and the reaction efficiency.
  • the reaction temperature in (when generating the GeH 4) for producing a GeH 4 is excellent in reaction rate, in terms of such can be produced GeH 4 at a low cost, preferably 5 ⁇ 100 ° C., more preferably 10 to 40 ° C.
  • the power consumption for heating the cell can be appropriately controlled without reducing the reaction efficiency.
  • the reaction atmosphere (the gas phase portions of the anode chamber and the cathode chamber) when producing GeH 4 is not particularly limited, but is preferably an inert gas atmosphere, and nitrogen gas is preferable as the inert gas.
  • the electrolytic solution in the electrochemical cell may remain stationary, may be stirred, or may be separately circulated by providing another liquid tank.
  • the other liquid tank is provided and circulated, the change in the concentration of the reaction solution becomes relatively small, the current efficiency can be stabilized, and the GeO 2 concentration on the electrode surface is kept high, and the reaction rate is increased. Improvement can be expected. For this reason, it is preferable to circulate the said electrolyte solution in an electrochemical cell.
  • ⁇ GeH 4 production equipment> This method is not particularly limited as long as the electrochemical cell is used.
  • a power source measuring means (FT-IR, pressure gauge (PI), integrating meter, etc.),
  • An apparatus having a conventionally known member such as a nitrogen gas (N 2 ) supply path, a mass flow controller (MFC), or an exhaust path can be used.
  • N 2 nitrogen gas
  • MFC mass flow controller
  • Example 1 A vinyl chloride electrochemical cell having the anode chamber and the cathode chamber separated by a diaphragm as shown in FIG. 1 was prepared using the following materials.
  • Cathode 0.5 cm ⁇ 0.5 cm ⁇ 0.5 mm thick Ag plate
  • Anode 2 cm ⁇ 2 cm ⁇ 0.5 mm thick Ni plate
  • Diaphragm Nafion (registered trademark) NRE-212 (manufactured by Sigma Aldrich) )
  • Electrolyte solution Liquid obtained by dissolving GeO 2 at a concentration of 90 g / L in a 4 mol / L KOH aqueous solution.
  • Electrolyte solution introduced into the cathode chamber 100 mL ⁇
  • Amount of electrolyte introduced into the anode chamber 100 mL Standard electrode: A silver-silver chloride electrode is installed at the cathode
  • the current efficiency is calculated from the amount of GeH 4 generated between 0 and 10 minutes after the current is applied and the applied current amount based on the following formula, and the current efficiency is the current efficiency for a reaction time of 10 minutes. It was. The results are shown in Table 1.
  • Current efficiency (%) [Electric amount (C / min) ⁇ 10 (min) ⁇ 100] corresponding to generation of GeH 4 in the generation amount (mmol / min) / 100 Total applied electric amount (C / min) ⁇ 10 (min)]
  • Example 1 The reaction was carried out under the same conditions as in Example 1 except that a 0.5 cm ⁇ 0.5 cm ⁇ 0.5 mm thick Cu plate was used as the cathode and the applied current was changed to ⁇ 85 mA for 10 minutes. The results are shown in Table 1.
  • Example 2 The reaction was performed under the same conditions as in Example 1 except that a Cd plate having a size of 0.5 cm ⁇ 0.5 cm ⁇ thickness 0.5 mm was used as the cathode and the applied current was changed to ⁇ 55 mA for 10 minutes. The results are shown in Table 1.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
PCT/JP2018/017649 2017-05-19 2018-05-07 電気化学的にゲルマンを製造する方法 WO2018212007A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020197034666A KR20190140026A (ko) 2017-05-19 2018-05-07 전기 화학적으로 게르만을 제조하는 방법
CN201880031311.0A CN110621810A (zh) 2017-05-19 2018-05-07 电化学制造锗烷的方法
JP2019519183A JP7110185B2 (ja) 2017-05-19 2018-05-07 電気化学的にゲルマンを製造する方法

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JP2017-099787 2017-05-19

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KR (1) KR20190140026A (zh)
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TW (1) TWI743360B (zh)
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TWI743360B (zh) 2021-10-21
KR20190140026A (ko) 2019-12-18
CN110621810A (zh) 2019-12-27
JP7110185B2 (ja) 2022-08-01
JPWO2018212007A1 (ja) 2020-03-26
TW201900931A (zh) 2019-01-01

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