Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 7, Pages 2488-2492Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201511032
Keywords
amorphous materials; cobalt-borate; hybrids; nanosheets; oxygen evolution reaction
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Funding
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [21222101, U1432133, 11132009, 21331005, 11321503, J1030412]
- Chinese Academy of Science [XDB01020300]
- Fok Ying-Tong Education Foundation, China [141042]
- China Postdoctoral Science Foundation [2015M580539]
- Fundamental Research Funds for the Central Universities [WK2060190027]
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Developing highly active catalysts for the oxygen evolution reaction (OER) is of paramount importance for designing various renewable energy storage and conversion devices. Herein, we report the synthesis of a category of Co-Pi analogue, namely cobalt-based borate (Co-Bi) ultrathin nanosheets/ graphene hybrid by a room-temperature synthesis approach. Benefiting from the high surface active sites exposure yield, enhanced electron transfer capacity, and strong synergetic coupled effect, this Co-Bi NS/G hybrid shows high catalytic activity with current density of 10 mAcm -2 at overpotential of 290 mV and Tafel slope of 53 mVdec -1 in alkaline medium. Moreover, Co-Bi NS/G electrocatalysts also exhibit promising performance under neutral conditions, with a low onset potential of 235 mV and high current density of 14.4 mAcm -2 at 1.8 V, which is the best OER performance among well-developed Co-based OER electrocatalysts to date. Our finding paves a way to develop highly active OER electrocatalysts.
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