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

作者：Yan, Zhenhua; Sun, Hongming; Chen, Xiang; Liu, Huanhuan; Zhao, Yaran; Li, Haixia; Xie, Wei; Cheng, Fangyi^*; Chen, Jun

来源：Nature Communications, 2018, 9(1): 2373.

DOI：10.1038/s41467-018-04788-3

• WATER OXIDATION
• ELECTROCATALYSTS
• PERFORMANCE
• NUCLEATION
• REDUCTION
• CATALYSIS
• GROWTH
• OXIDES
• FILMS
• IRON

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.

• 出版日期2018-6-18
• 单位南开大学