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Hierarchical NiCo 2 O 4 Hollow Microcuboids as Bifunctional Electrocatalysts for Overall Water‐Splitting
Author(s) -
Gao Xuehui,
Zhang Hongxiu,
Li Quanguo,
Yu Xuegong,
Hong Zhanglian,
Zhang Xingwang,
Liang Chengdu,
Lin Zhan
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201600525
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 (NiCo 2 O 4 ) has been considered a promising electrode material for the OER. However, NiCo 2 O 4 that can be used as an electrocatalyst in HER has not been studied yet. Herein, we report self‐assembled hierarchical NiCo 2 O 4 hollow microcuboids for overall water splitting including both the HER and OER reactions. The NiCo 2 O 4 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 NiCo 2 O 4 microflowers confirms the importance of structural features for high‐performance overall water splitting.