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Crystal‐Plane‐Dependent Activity of Spinel Co 3 O 4 Towards Water Splitting and the Oxygen Reduction Reaction
Author(s) -
Liu Qianfeng,
Chen Zhiping,
Yan Zhao,
Wang Yao,
Wang Erdong,
Wang Sheng,
Wang Shudong,
Sun Gongquan
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701302
Subject(s) - oxygen evolution , spinel , catalysis , nanomaterials , oxygen , materials science , water splitting , crystal (programming language) , polarization (electrochemistry) , metal , chemical engineering , inorganic chemistry , chemistry , nanotechnology , electrochemistry , metallurgy , electrode , biochemistry , organic chemistry , photocatalysis , computer science , programming language , engineering
Insights into the relationship between the crystal planes of metal oxides and the catalytic activity of the oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) are essential for developing efficient renewable energy technologies. Herein, spinel Co 3 O 4 nanomaterials were synthesized controllably with the specified morphologies of nanocubes, nanosheets, and nanoplates with different exposed planes of {100}, {110}, and {111}, respectively. The effects of the crystal planes of Co 3 O 4 on the activity for the OER, ORR, and HER were subsequently investigated in alkaline media. Different electrocatalytic performances are possibly attributed to the abundance ratios of Co 3+ /Co 2+ over the different exposed planes. The surface Co 3+ ions exhibit higher activity for the OER and HER, whereas the surface Co 2+ ions exhibit better performance for the ORR; moreover, higher electroconductivity enhances the polarization current for ORR and HER except OER.