简易电沉积法制备CoFe-P催化剂用于高效析氧反应

开发低成本、高活性且稳定的非贵金属催化剂是实现大规模电解水制氢的关键所在。在此,我们通过简便、合理的电沉积法在泡沫镍(NF)上构建了一种具备超薄二维纳米片形貌的高度非晶相Co1Fe1-P薄膜用于高效催化析氧反应(OER)。在1.0mol·L^-1 KOH溶液中,所制备的Co1Fe1-P/NF催化剂在电流密度为10和100 mA·cm^-2处的过电位分别为274.4和329.5 mV,Tafel斜率仅为 45.3 mV·dec^-1,可以媲美商业 RuO₂催化剂。此外,Co1Fe1-P/NF 催化剂在 10 mA·cm^-2的 100 h 计时电压法测试和1 000次循环伏安法测试中均表现出卓越的催化稳定性。Co1Fe1-P/NF催化剂优秀的催化活性归因于其独特的形貌、高度非晶相结构提供的低能垒、优化的电子结构以及钴磷化物和铁磷化物的强协同效应。

CoFe-P catalyst prepared by a facile electrodeposition for high-efficient oxygen evolution reaction

The development of low-cost, high-efficiency, and robust electrocatalysts with non-precious metal is the key to realizing large-scale hydrogen production by water electrolysis. Herein, a highly amorphous Co1Fe1-P film composed of ultrathin two-dimensional nanosheets was successfully loaded onto the nickel foam via a facile and reasonable electrodeposition method. Owing to the unique morphology, lowenergy barrier provided by highly amorphous structure, optimized electronic structure, and strong synergistic effects of cobalt phosphides and iron phosphides, the as-fabricated Co1Fe1-P/NF electrode exhibited outstanding electrocatalytic performance for oxygen evolution reaction (OER) with the low overpotentials of 274.4 and 329.5 mV at 10 and 100 mA·cm^-2 in 1.0 mol·L^-1 KOH, respectively. The corresponding Tafel slope was 45.3 mV·dec^-1, comparing favorably to that of commercial RuO₂ catalyst. Notably, the 100-hour chronopotentiometry at 10 mA·cm^-2 and 1 000 cycle voltammetry tests for OER with negligible attenuation confirmed the excellent stability and durability of Co1Fe1-P/NF.