Traditional Chinese Medicine College, Bozhou University, 236800 Bozhou, Anhui, PR China.
School of Chemistry and Chemical Engineering, Hefei University of Technology, 230009 Hefei, Anhui, PR China.
Dalton Trans. 2023 May 9;52(18):5999-6007. doi: 10.1039/d3dt00448a.
OER (oxygen evolution reaction) is a critical reaction in several storage and conversion systems for renewable and clean electrochemical energies, including solar fuel devices, metal-air batteries, as well as regenerative fuel and water splitting cells. Regarding the shortcomings of OER, apart from the sluggish kinetics and high reaction overpotential, the reaction rate and overpotential are difficult to be optimized simultaneously. Herein, a novel hierarchical particle-sheet-structured Fe-doped NiP electrocatalyst is developed, which presents abundant interfaces between crystalline particle and amorphous sheet. The OER overpotential is reduced to 204 mV at 20 mA cm current density, while it is reduced to 225 and 231 mV at 100 and 300 mA cm, respectively. The Fe-doped NiP electrocatalyst also shows fast reaction kinetics, whose Tafel slope is a remarkable 25 mV dec. For an electrolytic cell whose cathode and anode are Pt/C/NF and Fe-NiP/NF, respectively, a mere 1.446 V voltage is necessary to drive a 10 mA cm current density for achieving overall water-splitting property. Notably, it also works stably at considerably high current densities of 500 and 1000 mA cm, representing high potential for commercial applications.
OER（氧析出反应）是可再生和清洁能源电化学储能和转化系统中的关键反应，包括太阳能燃料装置、金属-空气电池以及再生燃料和水分解电池。鉴于 OER 的缺点，除了动力学缓慢和反应过电位高之外，反应速率和过电位也难以同时优化。本文开发了一种新型的分级颗粒-片状结构的 Fe 掺杂 NiP 电催化剂，它具有丰富的晶相颗粒和非晶相薄片之间的界面。OER 的过电位在 20 mA cm 的电流密度下降低至 204 mV，在 100 和 300 mA cm 时分别降低至 225 和 231 mV。Fe 掺杂 NiP 电催化剂还表现出快速的反应动力学，其 Tafel 斜率显著为 25 mV dec。对于阴极和阳极分别为 Pt/C/NF 和 Fe-NiP/NF 的电解槽，仅需 1.446 V 的电压即可驱动 10 mA cm 的电流密度，从而实现整体水分解性能。值得注意的是，它在相当高的电流密度 500 和 1000 mA cm 下也能稳定工作，具有商业应用的巨大潜力。
