过电位
催化作用
脱质子化
化学
氧气
空位缺陷
无机化学
镍
锂(药物)
析氧
材料科学
离子
物理化学
结晶学
电化学
有机化学
医学
内分泌学
电极
作者
Wen‐Kai Han,Jinxin Wei,Kang Xiao,Ting Ouyang,Xinwen Peng,Shenlong Zhao,Zhao‐Qing Liu
标识
DOI:10.1002/anie.202206050
摘要
Despite the fact that high-valent nickel-based oxides exhibit promising catalytic activity for the urea oxidation reaction (UOR), the fundamental questions concerning the origin of the high performance and the structure-activity correlations remain to be elucidated. Here, we unveil the underlying enhanced mechanism of UOR by employing a series of prepared cation-vacancy controllable LiNiO2 (LNO) model catalysts. Impressively, the optimized layered LNO-2 exhibits an extremely low overpotential at 10 mA cm-2 along with excellent stability after the 160 h test. Operando characterisations combined with the theoretical analysis reveal the activated lattice oxygen in layered LiNiO2 with moderate cation vacancies triggers charge disproportion of the Ni site to form Ni4+ species, facilitating deprotonation in a lattice oxygen involved catalytic process.
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