State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
Angew Chem Int Ed Engl. 2016 May 17;55(21):6290-4. doi: 10.1002/anie.201600525. Epub 2016 Apr 8.
Bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline electrolyte may improve the efficiency of overall water splitting. Nickel cobaltite (NiCo2 O4 ) has been considered a promising electrode material for the OER. However, NiCo2 O4 that can be used as an electrocatalyst in HER has not been studied yet. Herein, we report self-assembled hierarchical NiCo2 O4 hollow microcuboids for overall water splitting including both the HER and OER reactions. The NiCo2 O4 electrode shows excellent activity toward overall water splitting, with 10 mA cm(-2) water-splitting current reached by applying just 1.65 V and 20 mA cm(-2) by applying just 1.74 V across the two electrodes. The synthesis of NiCo2 O4 microflowers confirms the importance of structural features for high-performance overall water splitting.
用于碱性电解质中析氧反应 (OER) 和析氢反应 (HER) 的双功能电催化剂可以提高整体水分解的效率。镍钴氧化物 (NiCo2 O4 ) 已被认为是 OER 的一种很有前途的电极材料。然而，尚未研究过可作为 HER 中电催化剂的 NiCo2 O4 。在本文中，我们报告了自组装的分级 NiCo2 O4 中空微立方体形用于包括 HER 和 OER 反应在内的整体水分解。NiCo2 O4 电极对整体水分解表现出优异的活性，仅施加 1.65 V 即可达到 10 mA cm(-2) 的水分解电流，仅施加 1.74 V 即可达到 20 mA cm(-2) 的水分解电流。NiCo2 O4 微花的合成证实了结构特征对于高性能整体水分解的重要性。
