ArticleProceedings of the National Academy of Sciences of the United States of America2026
Unveiling the sensitivity and significance of the Ni oxidation state for alkaline hydrogen oxidation electrocatalysis.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The development of nonprecious-metal-based hydrogen oxidation reaction (HOR) electrocatalysts remains as the bottleneck for achieving high-performance, platinum group metal-free (PGM-free) alkaline/anion exchange membrane fuel cells. Numerous efforts have been dedicated toward enhancing the HOR activity of Ni catalysts due to the lack of alternative choices. However, mechanistic insights relating to electrocatalytic activity and degradation remain a matter of debate, and proposed models tend to lack conclusive experimental evidence. Here, we studied the state of Ni catalysts using scanning transmission electron microscopy and electron energy loss spectroscopy, together with in situ high energy resolution fluorescence detected X-ray absorption spectroscopy. The results revealed that a metallic Ni surface is crucial for effectively catalyzing the HOR, and that the formation of α-Ni(OH)
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