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dc.contributor.authorFaid, Alaa
dc.contributor.authorBarnett, Alejandro Oyarce
dc.contributor.authorSeland, Frode
dc.contributor.authorSunde, Svein
dc.description.abstractTailoring catalyst–ionomer and electrolyte interaction is crucial for the development of anion exchange membrane (AEM) water electrolysis. In this work, the interaction of Ni–MoO2 nanosheets with ionomers and electrolyte cations was investigated. The activity of Ni–MoO2 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–MoO2 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–MoO2 nanosheet electrodes as a cathode in a full non-platinum group metal (PGM) AEM electrolyzer, a current density of 1.15 A/cm2 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/cm2.en_US
dc.publisherACS Publicationsen_US
dc.relation.ispartofseriesACS Applied Energy Materials;2574-0962
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectEvolution reactionsen_US
dc.subjectTwo dimensional materialsen_US
dc.titleTuning Ni–MoO2 Catalyst–Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranesen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holderCopyright 2021 The Authors. Published by American Chemical Societyen_US
dc.source.journalACS Applied Energy Materialsen_US

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Navngivelse 4.0 Internasjonal
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