析氧
材料科学
分解水
催化作用
过电位
制氢
化学工程
电解水
双金属片
X射线光电子能谱
钴
贵金属
无机化学
电解
金属
电解质
电极
电化学
冶金
化学
物理化学
工程类
光催化
生物化学
作者
Dongyang Li,Rong Xiang,Yu Fang,Jinsong Zeng,Yong Zhang,Weichang Zhou,Liling Liao,Yan Zhang,Dongsheng Tang,Haiqing Zhou
标识
DOI:10.1002/adma.202305685
摘要
The key dilemma for green hydrogen production via electrocatalytic water splitting is the high overpotential required for anodic oxygen evolution reaction (OER). Co/Fe-based materials show superior catalytic OER activity to noble metal-based catalysts, but still lag far behind the state-of-the-art Ni/Fe-based catalysts probably due to undesirable side segregation of FeOOH with poor conductivity and unsatisfied structural durability under large current density. Here, a robust and durable OER catalyst affording current densities of 500 and 1000 mA cm-2 at extremely low overpotentials of 290 and 304 mV in base is reported. This catalyst evolves from amorphous bimetallic FeOOH/Co(OH)2 heterostructure microsheet arrays fabricated by a facile mechanical stirring strategy. Especially, in situ X-ray photoelectron spectroscopy (XPS) and Raman analysis decipher the rapid reconstruction of FeOOH/Co(OH)2 into dynamically stable Co1-x Fex OOH active phase through in situ iron incorporation into CoOOH, which perform as the real active sites accelerating the rate-determining step supported by density functional theory calculations. By coupling with MoNi4 /MoO2 cathode, the self-assembled alkaline electrolyzer can deliver 500 mA cm-2 at a low cell voltage of 1.613 V, better than commercial IrO2(+) ||Pt/C(-) and most of reported transition metal-based electrolyzers. This work provides a feasible strategy for the exploration and design of industrial water-splitting catalysts for large-scale green hydrogen production.
科研通智能强力驱动
Strongly Powered by AbleSci AI