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Anion insertion enhanced electrodeposition of robust metal hydroxide/oxide electrodes for oxygen evolution.


ABSTRACT: Electrochemical deposition is a facile strategy to prepare functional materials but suffers from limitation in thin films and uncontrollable interface engineering. Here we report a universal electrosynthesis of metal hydroxides/oxides on varied substrates via reduction of oxyacid anions. On graphitic substrates, we find that the insertion of nitrate ion in graphene layers significantly enhances the electrodeposit-support interface, resulting in high mass loading and super hydrophilic/aerophobic properties. For the electrocatalytic oxygen evolution reaction, the nanocrystalline cerium dioxide and amorphous nickel hydroxide co-electrodeposited on graphite exhibits low overpotential (177?mV@10?mA?cm-2) and sustains long-term durability (over 300?h) at a large current density of 1000?mA?cm-2. In situ Raman and operando X-ray diffraction unravel that the integration of cerium promotes the formation of electrocatalytically active gamma-phase nickel oxyhydroxide with exposed (003) facets. Therefore, combining anion intercalation with cathodic electrodeposition allows building robust electrodes with high electrochemical performance.

SUBMITTER: Yan Z 

PROVIDER: S-EPMC6006371 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Anion insertion enhanced electrodeposition of robust metal hydroxide/oxide electrodes for oxygen evolution.

Yan Zhenhua Z   Sun Hongming H   Chen Xiang X   Liu Huanhuan H   Zhao Yaran Y   Li Haixia H   Xie Wei W   Cheng Fangyi F   Chen Jun J  

Nature communications 20180618 1


Electrochemical deposition is a facile strategy to prepare functional materials but suffers from limitation in thin films and uncontrollable interface engineering. Here we report a universal electrosynthesis of metal hydroxides/oxides on varied substrates via reduction of oxyacid anions. On graphitic substrates, we find that the insertion of nitrate ion in graphene layers significantly enhances the electrodeposit-support interface, resulting in high mass loading and super hydrophilic/aerophobic  ...[more]

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