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Strong‐Coupled Cobalt Borate Nanosheets/Graphene Hybrid as Electrocatalyst for Water Oxidation Under Both Alkaline and Neutral Conditions
Author(s) -
Chen Pengzuo,
Xu Kun,
Zhou Tianpei,
Tong Yun,
Wu Junchi,
Cheng Han,
Lu Xiuli,
Ding Hui,
Wu Changzheng,
Xie Yi
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.201511032
Subject(s) - overpotential , tafel equation , oxygen evolution , electrocatalyst , graphene , cobalt , catalysis , materials science , boron , chemical engineering , water splitting , electron transfer , hybrid material , inorganic chemistry , nanotechnology , chemistry , electrochemistry , electrode , photochemistry , photocatalysis , metallurgy , organic chemistry , engineering
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‐B i ) 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‐B i NS/G hybrid shows high catalytic activity with current density of 10 mA cm −2 at overpotential of 290 mV and Tafel slope of 53 mV dec −1 in alkaline medium. Moreover, Co‐B i 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 mA cm −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.