Self-Adhesive Ionomers for Alkaline Electrolysis: Optimized Hydrogen Evolution Electrode

被引:8
|
作者
Tee, Hui Min [1 ]
Park, Habin [1 ]
Shah, Parin N. N. [1 ]
Trindell, Jamie A. A. [2 ]
Sugar, Joshua D. D. [2 ]
Kohl, Paul A. A. [1 ,2 ]
机构
[1] Georgia Inst Technol, Chem & Biomol Engn, Atlanta, GA 30332 USA
[2] Sandia Natl Labs, Livermore, CA 94550 USA
关键词
ANION-EXCHANGE MEMBRANE; WATER ELECTROLYSIS;
D O I
10.1149/1945-7111/acab8a
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Hydrogen produced through low-temperature water electrolysis using anion exchange membranes (AEM) combines the benefits of liquid-electrolyte alkaline electrolysis and solid-polymer proton exchange membrane electrolysis. The anion conductive ionomers in the oxygen-producing anode and hydrogen-producing cathode are a critical part of the three-dimensional electrodes. The ionomer in the hydrogen-producing cathode facilitates hydroxide ion conduction from the cathode catalyst to the anode catalyst, and water transport from the anode to the cathode catalyst through the AEM. This ionomer also binds the catalyst particles to the porous transport layer. In this study, the cathode durability was improved by use of a self-adhesive cathode ionomer to chemically bond the cathode catalyst particles to the porous transport layer. It was found that the cathode ionomers with high ion exchange capacity (IEC) were more effective than low IEC ionomers because of the need to transport water to the cathode catalyst and transport hydroxide away from the cathode. The cathode durability was improved by using ionomers which were soluble in the spray-coated cathode ink. Optimization of the catalyst and ionomer content within the cathode led to electrolysis cells which were both mechanically durable and operated at low voltage.
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页数:8
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