Laser-Ablation-Produced Cobalt Nickel Phosphate with High-Valence Nickel Ions as an Active Catalyst for the Oxygen Evolution Reaction |
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Authors: | Xuechun Sun Dr. Jiaqi Wang Yuehui Yin Haibin Wang Shuang Li Dr. Hui Liu Jing Mao Prof. Xiwen Du |
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Affiliation: | Institute of New-Energy Materials, Key Laboratory of Advanced Ceramics, and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300350 China |
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Abstract: | Cost-effective, highly efficient and stable non-noble metal-based catalysts for the oxygen evolution reaction (OER) are very crucial for energy storage and conversion. Here, an amorphous cobalt nickel phosphate (CoNiPO4), containing a considerable amount of high-valence Ni3+ species as an efficient electrocatalyst for OER in alkaline solution, is reported. The catalyst was converted from Co-doped Ni2P through pulsed laser ablation in liquid (PLAL) and exhibits a large specific surface area of 162.5 m2 g−1 and a low overpotential of 238 mV at 10 mA cm−2 with a Tafel slope of 46 mV dec−1, which is much lower than those of commercial RuO2 and IrO2. This work demonstrates that PLAL is a powerful technology for generating amorphous CoNiPO4 with high-valence Ni3+, thus paving a new way towards highly effective OER catalysts. |
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Keywords: | cobalt nickel phosphate high valence states oxygen evolution reaction pulsed laser ablation in liquids |
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