title: Strong-Coupled Cobalt Borate Nanosheets/Graphene Hybrid as Electrocatalyst for Water Oxidation Under Both Alkaline and Neutral Conditions.
abstract: 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 mA cm(-2) at overpotential of 290 mV and Tafel slope of 53 mV dec(-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 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.
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Pengzuo
authors.initials: P
authors.lastname: Chen
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Kun
authors.initials: K
authors.lastname: Xu
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Tianpei
authors.initials: T
authors.lastname: Zhou
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Tong
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Junchi
authors.initials: J
authors.lastname: Wu
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Han
authors.initials: H
authors.lastname: Cheng
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Xiuli
authors.initials: X
authors.lastname: Lu
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Ding
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China. czwu@ustc.edu.cn.
authors.forename: Changzheng
authors.initials: C
authors.lastname: Wu
authors.affiliation: School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xie
keywords: amorphous materials; cobalt-borate; hybrids; nanosheets; oxygen evolution reaction