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

Tee, Hui Min; Park, Habin; Shah, Parin N.; Trindell, Jamie A.; Sugar, Joshua Daniel; Kohl, Paul A.

doi:10.1149/1945-7111/acab8a

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

Journal Article · Thu Dec 22 23:00:00 EST 2022 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/acab8a· OSTI ID:2311762

Tee, Hui Min ^[1]; Park, Habin ^[1]; Shah, Parin N. ^[1]; Trindell, Jamie A. ^[2]; Sugar, Joshua Daniel ^[2]; ^[1]

Georgia Institute of Technology, Atlanta, GA (United States)
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

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. Here 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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525; EE0008833

OSTI ID:: 2311762

Alternate ID(s):: OSTI ID: 2568267

Report Number(s):: SAND--2023-12742J

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 169; ISSN 0013-4651

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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

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