摘要
Developing low-cost and earth-abundant electrocatalysts with high performance for electrochemical water splitting is a challenging issue. Herein, we report a facile and effective way to fabricate three-dimension(3D) ordered mesoporous Co1-xFexP(x=0, 0.25, 0.5, 0.75) electrocatalyst.Benefiting from 3D ordered mesoporous pore channels and composition optimization, the Co0.75Fe0.25 P exhibits excellent electrocatalytic activities with low overpotentials of 270 and 209 mV at 10 mA cm^-2 for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER), respectively, in the alkaline electrolyte along with a durable electrochemical stability. In addition, as both the cathode and anode, the Co0.75Fe0.25P also exhibits superior electrolysis water splitting performance with only an applied voltage of 1.63 V to attain a current density of 10 m A cm^-2 without obvious decay for 18 h,indicating that the Co0.75Fe0.25P is an efficient electrocatalyst for overall water splitting.
构筑低成本、资源丰富、高效的电化学全解水催化剂是目前一个极具挑战的课题.本文报道了一种简便高效地制备三维有序介孔Co1-xFexP (x=0, 0.25, 0.5, 0.75)电催化剂的方法.得益于三维有序介孔孔道和成分的优化, Co0.75Fe0.25P催化剂在碱性电解质中表现出优异的电催化活性,在电流密度为10 m A cm^-2下,析氧和析氢的过电位分别是270和209 m V,同时该催化剂也表现出良好的电化学稳定性.利用Co0.75Fe0.25P催化剂作为电解水制氢的阴极和阳极,只需要施加1.63 V的电压即可获得10 m A cm^-2的电流密度,并且在18 h稳定性测试后电流密度没有出现衰减,证明其在全解水应用中具有优异的催化活性.
基金
supported by the National Natural Science Foundation of China (51571072 and 51871078)
Heilongjiang Science Foundation (E2018028)
