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Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes

[Image: see text] Tailoring catalyst–ionomer and electrolyte interaction is crucial for the development of anion exchange membrane (AEM) water electrolysis. In this work, the interaction of Ni–MoO(2) nanosheets with ionomers and electrolyte cations was investigated. The activity of Ni–MoO(2) nanoshe...

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Autores principales: Faid, Alaa Y., Barnett, Alejandro Oyarce, Seland, Frode, Sunde, Svein
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8159162/
https://www.ncbi.nlm.nih.gov/pubmed/34056552
http://dx.doi.org/10.1021/acsaem.0c03072
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author Faid, Alaa Y.
Barnett, Alejandro Oyarce
Seland, Frode
Sunde, Svein
author_facet Faid, Alaa Y.
Barnett, Alejandro Oyarce
Seland, Frode
Sunde, Svein
author_sort Faid, Alaa Y.
collection PubMed
description [Image: see text] Tailoring catalyst–ionomer and electrolyte interaction is crucial for the development of anion exchange membrane (AEM) water electrolysis. In this work, the interaction of Ni–MoO(2) nanosheets with ionomers and electrolyte cations was investigated. The activity of Ni–MoO(2) nanosheets for the hydrogen evolution reaction (HER) increased when tested in 1 M NaOH compared to 1 M KOH; however, it decreased when tested in 0.01 M KOH compared to 1 M KOH electrolyte. The capacitance minimum associated with the potential of zero free charge (pzfc) was shifted negatively from 0.5 to 0.4 V versus RHE when KOH concentration increased from 0.1 mM to 1 M KOH, suggesting a softening of the water in the double-layer to facilitate the OH(–) transport and faster kinetics of the Volmer step that lead to improved HER activity. The catalyst interaction with cationic moieties in the anion ionomer (or organic electrolytes) can also be rationalized based on the capacitance minimum, because the latter indicates a negatively charged catalyst during the HER, attracting the cationic moieties leading to the blocking of the catalytic sites and lower HER performance. The HER activity of Ni–MoO(2) nanosheets is lower in benzyltrimethylammonium hydroxide (BTMAOH) than in tetramethylammonium hydroxide (TMAOH). Anion fumion ionomer and electrolytes with organic cations with benzyl group adsorption (such as BTMAOH) lead to decreased HER activity in comparison with TMAOH and Nafion. By utilizing Ni–MoO(2) nanosheet electrodes as a cathode in a full non-platinum group metal (PGM) AEM electrolyzer, a current density of 1.15 A/cm(2) at 2 V cell voltage in 1 M KOH at 50 °C was achieved. The electrolyzer showed exceptional stability in 0.1 M KOH for 65 h at 0.5 A/cm(2).
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spelling pubmed-81591622021-05-28 Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes Faid, Alaa Y. Barnett, Alejandro Oyarce Seland, Frode Sunde, Svein ACS Appl Energy Mater [Image: see text] Tailoring catalyst–ionomer and electrolyte interaction is crucial for the development of anion exchange membrane (AEM) water electrolysis. In this work, the interaction of Ni–MoO(2) nanosheets with ionomers and electrolyte cations was investigated. The activity of Ni–MoO(2) nanosheets for the hydrogen evolution reaction (HER) increased when tested in 1 M NaOH compared to 1 M KOH; however, it decreased when tested in 0.01 M KOH compared to 1 M KOH electrolyte. The capacitance minimum associated with the potential of zero free charge (pzfc) was shifted negatively from 0.5 to 0.4 V versus RHE when KOH concentration increased from 0.1 mM to 1 M KOH, suggesting a softening of the water in the double-layer to facilitate the OH(–) transport and faster kinetics of the Volmer step that lead to improved HER activity. The catalyst interaction with cationic moieties in the anion ionomer (or organic electrolytes) can also be rationalized based on the capacitance minimum, because the latter indicates a negatively charged catalyst during the HER, attracting the cationic moieties leading to the blocking of the catalytic sites and lower HER performance. The HER activity of Ni–MoO(2) nanosheets is lower in benzyltrimethylammonium hydroxide (BTMAOH) than in tetramethylammonium hydroxide (TMAOH). Anion fumion ionomer and electrolytes with organic cations with benzyl group adsorption (such as BTMAOH) lead to decreased HER activity in comparison with TMAOH and Nafion. By utilizing Ni–MoO(2) nanosheet electrodes as a cathode in a full non-platinum group metal (PGM) AEM electrolyzer, a current density of 1.15 A/cm(2) at 2 V cell voltage in 1 M KOH at 50 °C was achieved. The electrolyzer showed exceptional stability in 0.1 M KOH for 65 h at 0.5 A/cm(2). American Chemical Society 2021-03-23 2021-04-26 /pmc/articles/PMC8159162/ /pubmed/34056552 http://dx.doi.org/10.1021/acsaem.0c03072 Text en © 2021 The Authors. Published by American Chemical Society Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Faid, Alaa Y.
Barnett, Alejandro Oyarce
Seland, Frode
Sunde, Svein
Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes
title Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes
title_full Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes
title_fullStr Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes
title_full_unstemmed Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes
title_short Tuning Ni–MoO(2) Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes
title_sort tuning ni–moo(2) catalyst–ionomer and electrolyte interaction for water electrolyzers with anion exchange membranes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8159162/
https://www.ncbi.nlm.nih.gov/pubmed/34056552
http://dx.doi.org/10.1021/acsaem.0c03072
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