Strong‐Coupled Cobalt Borate Nanosheets/Graphene Hybrid as Electrocatalyst for Water Oxidation Under Both Alkaline and Neutral Conditions. Issue 7 (12th January 2016)

• Record Type: Journal Article
• Authors: Chen, Pengzuo; Xu, Kun; Zhou, Tianpei; Tong, Yun; Wu, Junchi; Cheng, Han; Lu, Xiuli; Ding, Hui; Wu, Changzheng; Xie, Yi
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 7(2016)
• Page Start: 2488
• Page End: 2492
• Publication Date: 2016-01-12
• Subjects: amorphous materials -- cobalt–borate -- hybrids -- nanosheets -- oxygen evolution reaction; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201511032
• Languages: English
• ISSNs: 1433-7851

Abstract

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. Abstract : Amorphous Co‐based borate ultrathin nanosheets/graphene hybrid was prepared by a room‐temperature chemical approach and investigated as an OER electrocatalyst. This Co‐Bi NS/G hybrid electrocatalyst showed high OER catalytic activity and superior stability in both alkaline and neutral solutions.