过电位
析氧
氢氧化物
材料科学
电化学
价(化学)
分解水
拉曼光谱
层状双氢氧化物
催化作用
化学工程
无机化学
化学
物理化学
电极
光学
物理
工程类
光催化
生物化学
有机化学
作者
Yu Zhu,Xuan Wang,Xiaoheng Zhu,Zixin Wu,Dongsheng Zhao,Fei Wang,Dongmei Sun,Yawen Tang,Hao Li,Gengtao Fu
出处
期刊:Small
[Wiley]
日期:2022-11-29
卷期号:19 (5)
被引量:100
标识
DOI:10.1002/smll.202206531
摘要
Layered double-hydroxide (LDH) has been considered an important class of electrocatalysts for the oxygen evolution reaction (OER), but the adsorption-desorption behaviors of oxygen intermediates on its surface still remain unsatisfactory. Apart from transition-metal doping to solve this electrocatalytic problem of LDH, rare-earth (RE) species have sprung up as emerging dopants owing to their unique 4f valence-electronic configurations. Herein, the Er is chosen as a RE model to improve OER activity of LDH via constructing nickel foam supported Er-doped NiFe-LDH catalyst (Er-NiFe-LDH@NF). The optimal Er-NiFe-LDH@NF exhibits a low overpotential (191 mV at 10 mA cm-2 ), high turnover frequency (0.588 s-1 ), and low activation energy (36.03 kJ mol-1 ), which are superior to Er-free sample. Electrochemical in situ Raman spectra reveal the facilitated transition of Ni-OH into Ni-OOH for promoted OER kinetics through the Er doping effect. Theoretical calculations demonstrate that the introduction of Er facilitates the spin crossover of valence electrons by optimizing the d band center of NiFe-LDH, which leads to the GO -GHO closer to the optimal activity of the kinetic OER volcano by balancing the bonding strength of *O and *OH. Moreover, the Er-NiFe-LDH@NF presents high practicability in electrochemical water-splitting devices with a low driving potential of and a well-extended driving period.
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