Cu2-xSe@CuO core-shell assembly grew on copper foam for efficient oxygen evolution |
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Affiliation: | 1. Department of Materials and Engineer, Taizhou University, Taizhou 318000, China;2. Changchun Faway Adient Automotive Systemes Co. Ltd., Chuangchun 130012, China |
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Abstract: | Hydrogen production from electrolyzed water is a mature technology and has great development prospects in terms of energy conversion and utilization. However, the kinetically sluggish oxygen-evolution reaction becomes the limiting step in the electrolysis of water. Copper-based materials have been reported as a good choice to catalyze the oxygen evolution reaction, but their performance is poor. We describe a Cu2-xSe@CuO/copper foam core–shell structure from the in situ electrochemical oxidation of Cu2Se/copper foam to promote the oxygen-evolution reaction performance. The presence of a semi-metallic Cu2-xSe core and nanostructured CuO shell at a current density of 10 mA cm−2 requires a low overpotential of 253 mV. The Tafel slope was only 73 mV dec−1. The preparation of Cu2-xSe@CuO on three-dimensional copper foam facilitates the reaction. |
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Keywords: | Electrochemical oxidation Core–shell structure Oxygen-evolution reaction |
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