Interface engineering of copper-cobalt based heterostructure as bifunctional electrocatalysts for overall water splitting |
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Affiliation: | 1. Department of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea;2. Photocatalysis International Research Center, Tokyo University of Science, Yazamaki, Noda 278-8510, Chiba, Japan;3. Department of Physics, The Institute of Science, 15 Madam Cama Road, Mumbai, 400032, India;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, PR China;2. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 210009, PR China |
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Abstract: | It is of great significance to develop highly active and cost-effective electrocatalysts for the oxygen evolution reaction and hydrogen evolution reaction in alkaline solution. Herein, we report an interface engineering strategy to fabricate 3D hierarchical CuCo2O4@CuCo2S4 heterostructure catalysts with efficient synergistic effects for water splitting. Owing to the special nano-architectures with abundant active interfaces, the as-prepared CuCo2O4@CuCo2S4 catalysts exhibit superior electrochemical activity and prominent electrochemical stability, with a small overpotential of 240 and 101 mV for oxygen and hydrogen evolution reactions to deliver a current density of 10 mA cm−2, respectively. Remarkably, the CuCo2O4@CuCo2S4 materials directly applied as both anode and cathode electrode demonstrate excellent water splitting performance, achieving 10 mA cm−2 at a low cell voltage of only 1.53 V, outperforming the integrated state-of-the-art RuO2||Pt/C couple (1.56 V). Moreover, density functional theory calculations suggest that the excellent overall water splitting property of CuCo2O4@CuCo2S4 is attributed to a large amount of hierarchical hetero-interfaces, giving rise to effective adsorption and cleavage of H2O molecules on the catalyst surface. This work represents a general strategy to exploit efficient and stable hybrid electrocatalysts for renewable energy applications by rational catalyst interface engineering. |
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Keywords: | Interface engineering Electrocatalysts Overall water splitting |
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