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Electrically Insulated Catalyst–Ionomer Anode Interfaces toward Durable Alkaline Membrane Electrolyzers
Abstract
Anion-exchange-membrane water electrolysis (AEMWE) is an emerging technology for scalable hydrogen production. AEMWE has poor durability when operating without supporting electrolyte due to the oxidation of ionomers and membranes in contact with the anode oxygen evolution reaction (OER) catalyst. We report a new “passivated” anode architecture for AEMWE where the OER catalysts and ionomers are physically separated with a thin film amorphous oxide coating that is electrically insulating but conductive to hydroxide ions. We find that 2–3 nm of HfOx passivation layers show sufficient hydroxide ion transport to minimally limit the cell performance while suppressing ionomer degradation with both Ir (500 mA·cm–2 for 40 h) and CoOx (1.0 A·cm–2 for 100 h) model porous-transport-layer-supported catalysts in AEMWE. As a result, this interfacial engineering approach guides electrode design to improve the durability of AEMWE, particularly for systems operating with pure-water feed.
- Authors:
-
[1];
[1];
[2]
- University of Oregon, Eugene, OR (United States)
- University of Oregon, Eugene, OR (United States); University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of Oregon, Eugene, OR (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)
- OSTI Identifier:
- 2322440
- Grant/Contract Number:
- EE0008841
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Energy Letters
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Catalysts; Electrodes; Ionomers; Layers; Transition metals
Citation Formats
Kwak, Minkyoung, Ojha, Kasinath, Shen, Meikun, and Boettcher, Shannon W. Electrically Insulated Catalyst–Ionomer Anode Interfaces toward Durable Alkaline Membrane Electrolyzers. United States: N. p., 2024.
Web. doi:10.1021/acsenergylett.3c02620.
Kwak, Minkyoung, Ojha, Kasinath, Shen, Meikun, & Boettcher, Shannon W. Electrically Insulated Catalyst–Ionomer Anode Interfaces toward Durable Alkaline Membrane Electrolyzers. United States. https://doi.org/10.1021/acsenergylett.3c02620
Kwak, Minkyoung, Ojha, Kasinath, Shen, Meikun, and Boettcher, Shannon W. Fri .
"Electrically Insulated Catalyst–Ionomer Anode Interfaces toward Durable Alkaline Membrane Electrolyzers". United States. https://doi.org/10.1021/acsenergylett.3c02620.
@article{osti_2322440,
title = {Electrically Insulated Catalyst–Ionomer Anode Interfaces toward Durable Alkaline Membrane Electrolyzers},
author = {Kwak, Minkyoung and Ojha, Kasinath and Shen, Meikun and Boettcher, Shannon W.},
abstractNote = {Anion-exchange-membrane water electrolysis (AEMWE) is an emerging technology for scalable hydrogen production. AEMWE has poor durability when operating without supporting electrolyte due to the oxidation of ionomers and membranes in contact with the anode oxygen evolution reaction (OER) catalyst. We report a new “passivated” anode architecture for AEMWE where the OER catalysts and ionomers are physically separated with a thin film amorphous oxide coating that is electrically insulating but conductive to hydroxide ions. We find that 2–3 nm of HfOx passivation layers show sufficient hydroxide ion transport to minimally limit the cell performance while suppressing ionomer degradation with both Ir (500 mA·cm–2 for 40 h) and CoOx (1.0 A·cm–2 for 100 h) model porous-transport-layer-supported catalysts in AEMWE. As a result, this interfacial engineering approach guides electrode design to improve the durability of AEMWE, particularly for systems operating with pure-water feed.},
doi = {10.1021/acsenergylett.3c02620},
journal = {ACS Energy Letters},
number = 3,
volume = 9,
place = {United States},
year = {Fri Feb 16 00:00:00 EST 2024},
month = {Fri Feb 16 00:00:00 EST 2024}
}
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