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Steering elementary steps towards efficient alkaline hydrogen evolution via size-dependent Ni/NiO nanoscale heterosurfaces

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Zhao, Lu, Zhang, Yun, Zhao, Zhonglong, Zhang, Qing-Hua, Huang, Lin-Bo, Gu, Lin, Lu, Gang, Hu, Jin-Song, Wan, Li-Jun·2020·National Science Review
DOI 10.1093/nsr/nwz145
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Abstract

Alkaline hydrogen evolution reaction (HER), consisting of Volmer and Heyrovsky/Tafel steps, requires extra energy for water dissociation, leading to more sluggish kinetics than acidic HER. Despite the advances in electrocatalysts, how to combine active sites to synergistically promote both steps and understand the underlying mechanism remain largely unexplored. Here, Density Functional Theory (DFT) calculations predict that NiO accelerates the Volmer step while metallic Ni facilitates the Heyrovsky/Tafel step. A facile strategy is thus developed to control Ni/NiO heterosurfaces in uniform and well-dispersed Ni-based nanocrystals, targeting both reaction steps synergistically. By systematically modulating the surface composition, we find that steering the elementary steps through tuning the Ni/NiO ratio can significantly enhance alkaline HER activity, and Ni/NiO nanocrystals with a Ni/NiO ratio of 23.7% deliver the best activity, outperforming other state-of-the-art analogues. The results suggest that integrating bicomponent active sites for elementary steps is effective for promoting alkaline HER, but they have to be balanced.

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Metadata

Authors
Zhao, L., Zhang, Y., Zhao, Z., Zhang, Q.-H., Huang, L.-B., Gu, L., Lu, G., Hu, J.-S., & Wan, L.-J.
Venue
National Science Review
Publisher
Oxford University Press (OUP)
Published
2019-10-01
Volume
7
Issue
1
Pages
27-36
ISSN
  • 2053-714X (ISSN-L)
  • 2095-5138
DOI
10.1093/nsr/nwz145
OpenAlex
W2977251034
Cited by
333
References
5
FWCI
6.80
Type
journal article
Language
en
Open access
hybrid
Licence
creativecommons.org/licenses/by/4.0/ (vor)
Funders
  • National Key Research and Development Program of China (2016YFB0101202)
  • National Natural Science Foundation of China (21773263, 91645123)
  • Strategic Priority Research Program of the Chinese Academy of Sciences (XDB12020100)
  • National Science Foundation (DMR-1828019)

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CoChat. (2026). Citation check: Steering elementary steps towards efficient alkaline hydrogen evolution via size-dependent Ni/NiO nanoscale heterosurfaces. https://app.cochat.ai/papers/10.1093/nsr/nwz145
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Zhao, L., Zhang, Y., Zhao, Z., Zhang, Q.-H., Huang, L.-B., Gu, L., Lu, G., Hu, J.-S., & Wan, L.-J. (2020). Steering elementary steps towards efficient alkaline hydrogen evolution via size-dependent Ni/NiO nanoscale heterosurfaces. National Science Review. https://doi.org/10.1093/nsr/nwz145

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