INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Preparation of Cobalt Iron Bi-metallic Hydroxide Nano-sheet and Its Performance of Overall Water Splitting at High Current Densities |
MU Weina1, WANG Lixia1,2, WANG Qiong1,2, CAI Yanrong1,2, CHANG Chun1,2, BAO Decai1
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1 College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China 2 Institute of Ocean Research, Bohai University, Jinzhou 121013, China |
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Abstract Cobalt iron bi-metallic hydroxide nano-sheet is prepared in-situ on nickel foam (NF) through one step hydrothermal method. It is demonstrated to be a highly efficient bifunctional electrocatalyst for overall water splitting with good stability at high current densities. The synthetic electrocatalyst achieves low overpotential of 216 mV,269 mV and 284 mV at current density of 100 mA/cm2,200 mA/cm2,250 mA/cm2 for oxygen evolution reaction (OER) and a small Tafel slope of 49.79 mV/dec, and also achieves low overpotential of 137 mV,221 mV,256 mV and 297 mV at current density of 10 mA/cm2,50 mA/cm2,100 mA/cm2 and 200 mA/cm2 for hydrogen evolution reaction (HER) and a Tafel slope of 113.15 mV/dec, respectively, in 1 mol/L KOH. For the overall water splitting, it requires only a low cell voltage (1.532 V) to reach the current density of 200 mA/cm2. The electrocatalyst is exhibited only a minor chronoamperometric decay of 8.86% and only a chronopotentiometric sligh-tly rise of 2.12% at 200 mA/cm2 after 20 h. Therefore, the prepared cobalt iron bi-metallic hydroxide nano-sheet has efficient and stable electrocatalytic performance.
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Published: 25 December 2021
Online: 2021-12-27
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Fund:This work was financially supported by Liaoning Revitalization Talents Program (XLYC1907173), the National Natural Science Foundation of China (51508026), the Natural Science Foundation of Liaoning Province (20180550030), the Science and Technology General Project of Liaoning Provincial Education Department (LQ2019003, LQ2020014, LJ2020014), and the Open Fund of Institute of Ocean Research (BDHYYJY2020014). |
About author: Weina Mureceived her bachelor's degree of enginee-ring from Liaoning University of Technology in July 2006, and is currently studying for her M.S. degree in physical chemistry from College of Chemistry and Material Engineering in Bohai University. Her research interests are mainly electrocatalytic for water splitting. Decai Bao, a doctor, professor and master's supervisor of Bohai University. From 1998 to 1999, as a visi-ting scholar, he was supported by China Scholarship Council and sent to Tokyo University of Agriculture and Technology in Japan for cooperative research. He is mainly engaged in the research of sustained and controlled release carrier materials and polymer microcapsule membrane supported metal catalysts. He has published more than 30 papers in academic journals at home and abroad. |
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