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SO2 depolarization electrolytic tank

An electrolytic cell and depolarization technology, applied in the field of electrochemistry, can solve the problems of easy cracking, high processing cost, and high cost, and achieve the effects of high chemical stability, improved efficiency, and high conductivity

Active Publication Date: 2020-07-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of this invention is to provide a kind of SO 2 Depolarized electrolytic cells designed to address existing SO 2 The following problems exist in the depolarized electrolytic cell: 1) the bipolar plate needs to engrave the flow channel on both sides, which is difficult to process and high in processing cost; High, brittle, and prone to brittle cracks during assembly. In addition, carbon paper is not easy to fix inside the battery, and it is easy to move under material flow conditions, which seriously affects battery performance.

Method used

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Embodiment 1

[0035] Using the scheme of the present invention, the SO 2 In depolarized electrolytic cells, the membrane electrode assembly consists of an anode catalyst layer, a proton selective permeable membrane and a cathode catalyst layer. Among them, the proton selective permeable membrane is Nafion 115 (DuPont Company) proton exchange membrane, which is sprayed with Pt / C catalyst layer on both sides, and the effective membrane area of ​​each single cell is 50cm 2 , the amount of Pt used is 0.6mg / cm 2 , the amount of Pt used on the cathode side and the anode side is the same, each 0.3mg / cm 2 . On both sides of the membrane electrode assembly, a cathode-side support body 2 , an upper pole plate 1 , an anode-side support body 5 , and a lower pole plate 7 are distributed sequentially. The cathode side support is 0.3 mm thick carbon paper, and the anode side support is 0.5 mm graphite felt (85% porosity, 99.5% carbon content).

[0036] Both the upper and lower plates are 1mm thick tit...

Embodiment 2

[0040] Using the solution of the present invention, the SO 2 In depolarized electrolytic cells, the membrane electrode assembly consists of an anode catalyst layer, a proton selective permeable membrane and a cathode catalyst layer. Among them, the proton selective permeation membrane is selected as Nafion 117 (DuPont Company) proton exchange membrane, and the Pt / C catalyst layer is sprayed on both sides, and the effective membrane area of ​​each single cell is 100cm 2 , the amount of Pt used is 0.5mg / cm 2 , the amount of Pt used on the cathode side and the anode side is the same, each 0.25mg / cm 2 . On both sides of the membrane electrode assembly, a cathode side support body, an upper pole plate, an anode side support body, and a lower pole plate are sequentially distributed. Both the cathode-side support and the anode-side support are 4 cm thick graphite felt (porosity 92%, carbon content 99.9%).

[0041] Both the upper plate and the lower plate are hard graphite plates ...

Embodiment 3

[0046] Using the solution of the present invention, the SO 2 In depolarized electrolytic cells, the membrane electrode assembly consists of an anode catalyst layer, a proton selective permeable membrane and a cathode catalyst layer. Among them, the proton selective permeation membrane is selected as Nafion 117 (DuPont Company) proton exchange membrane, and the Pt / C catalyst layer is sprayed on both sides, and the effective membrane area of ​​each single cell is 100cm 2 , the amount of Pt used is 0.5mg / cm 2 , the amount of Pt used on the cathode side and the anode side is the same. On both sides of the membrane electrode assembly, a cathode side support body, an upper pole plate, an anode side support body, and a lower pole plate are sequentially distributed. The anode side support is 2.5mm graphite felt (porosity 92%, carbon content 99.9%), the cathode side support is 3.5mm graphite felt (porosity 92%, carbon content 99.9%) and 0.3mm thick carbon paper , in which the carbon...

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Abstract

The invention discloses an SO2 depolarization electrolytic tank, and belongs to the technical field of electrochemistry. The electrolytic tank comprises one or more single cells which are arranged insequence, wherein each single cell comprises a membrane electrode assembly, a cathode side support body, an anode side support body, a sealing ring, an upper polar plate and a lower polar plate. The anode side support body is made of a graphite felt material with large porosity; the upper pole plate and the lower pole plate are of flat-plate-shaped structures. The large-porosity graphite felt canprovide good filling and supporting effects, so that an anode material can uniformly and quickly pass through the interior of the large-porosity graphite felt, and the large-porosity graphite felt canbe stably used for a long time under the conditions of feed liquid soaking and high-current electrochemical reaction. Meanwhile, a catalyst is easily supported on the graphite felt, so that the electrochemical reaction efficiency in the electrolytic tank can be further improved. According to the invention, the problems of high processing difficulty, high processing cost and the like caused by flow channel engraving of the upper and lower polar plates are effectively avoided. By adopting the technical scheme provided by the invention, the SO2 depolarization electrolytic tank which is efficient, stable, compact and low in cost can be constructed.

Description

technical field [0001] The invention relates to an electrochemical device, in particular to a 2 An electrolytic cell for depolarization electrolysis belongs to the technical field of electrochemistry. Background technique [0002] SO 2 Depolarized electrolysis Electrolysis, or SDE, is one of the key steps in the hybrid sulfur cycle (HyS-cycle) for hydrogen production. As the simplest thermochemical water splitting process, the mixed sulfur cycle contains only two reactions, one of which is a thermochemical reaction—sulfuric acid decomposition reaction; and the other is an electrochemical reaction—that is, the SDE process. The reaction formulas of the above two reactions are as follows: [0003] h 2 SO 4 → SO 2 +H 2 O+1 / 2O 2 [0004] 2H 2 O+SO 2 →H 2 SO 4 +H 2 [0005] The above two reactions are combined, and the net reaction is water splitting to generate hydrogen and oxygen. [0006] It can be seen that SDE is the hydrogen production step of the mixed sulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/10C25B9/10C25B9/04C25B11/02C25B9/23
CPCC25B11/02C25B1/04C25B9/73C25B9/65C25B9/23Y02E60/36
Inventor 陈崧哲张平王来军
Owner TSINGHUA UNIV
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