Engineering oxygen vacancy-rich Co3O4 nanowire as high-efficiency and durable bifunctional electrocatalyst for overall alkaline water splitting |
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| Authors: | YUAN Hefeng MA Zizai WANG Shumin LI Jinping WANG Xiaoguang |
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| Affiliation: | 1.Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030600, Shanxi, China;2.Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, Shanxi, China |
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| Abstract: | A novel kind of vacancy-rich nanowire arrays were prepared by reducing rough Co3O4 nanowires with NaBH4 solution on 3D nickel foam at room temperature for overall water splitting. Co3O4/NF treated by NaBH4 for 10 min was highly active for oxygen evolution reaction (OER) and simultaneously efficient for hydrogen evolution reaction (HER) with the need of the overpotentials of 240 and 132 mV to drive 10 mA·cm-2 in alkaline media, respectively. Furthermore, the electrocatalysts as both cathode and anode in a two-electrode system presented excellent durability for over 60 h at 10 mA·cm-2, maintaining the cell voltage of merely 1.63 V. This work provides new methods and ideas for the preparation of transition metal oxide bifunctional electrocatalysts rich in oxygen vacancies. |
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| Keywords: | oxygen vacancy Co3O4 nanostructure electrochemistry hydrogen production oxygen evolution reaction |
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