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001     878262
005     20210130005519.0
024 7 _ |a 10.1021/acsami.0c03154
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082 _ _ |a 600
100 1 _ |a Wei, Xian-Kui
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245 _ _ |a Self-Epitaxial Hetero-Nanolayers and Surface Atom Reconstruction in Electrocatalytic Nickel Phosphides
260 _ _ |a Washington, DC
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520 _ _ |a Surface atomic, compositional, and electronic structures play decisive roles in governing the performance of catalysts during electrochemical reactions. Nevertheless, for efficient and cheap transition-metal phosphides used for water splitting, such atomic-scale structural information is largely missing. Despite much effort being made so far, there is still a long way to go for establishing a precise structure–activity relationship. Here, in combination with electron-beam bombardment and compositional analysis, our atomic-scale transmission electron microscopy study on Ni5P4 nanosheets, with a preferential (001) orientation, directly reveals the coverage of a self-epitaxial Ni2P nanolayer on the phosphide surface. Apart from the presence of nickel vacancies in the Ni5P4 phase, our quantum-mechanical image simulations also suggest the existence of an additional NiPx (0 < x < 0.5) nanolayer, characteristic of complex surface atom reconstruction, on the outermost surface of the phosphides. The surface chemical gradient and the core–shell scenario, probably responsible for the passivated catalytic activity, provide a novel insight to understand the catalytic performance of transition-metal catalysts used for electrochemical energy conversion.
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536 _ _ |a CritCat - Towards Replacement of Critical Catalyst Materials by Improved Nanoparticle Control and Rational Design (686053)
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700 1 _ |a Xiong, Dehua
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700 1 _ |a Liu, Lifeng
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700 1 _ |a Dunin-Borkowski, Rafal E.
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773 _ _ |a 10.1021/acsami.0c03154
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856 4 _ |u https://juser.fz-juelich.de/record/878262/files/acsami.0c03154.pdf
856 4 _ |y Published on 2020-04-17. Available in OpenAccess from 2021-04-17.
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856 4 _ |y Published on 2020-04-17. Available in OpenAccess from 2021-04-17.
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