过电位
双金属片
析氧
材料科学
电化学
过渡金属
氢氧化物
催化作用
兴奋剂
密度泛函理论
化学工程
金属
纳米技术
无机化学
物理化学
电极
计算化学
化学
冶金
光电子学
生物化学
工程类
作者
Haotian Zhang,Haoran Guo,Yanyan Li,Qinghua Zhang,Lirong Zheng,Lin Gu,Rui Song
标识
DOI:10.1002/adfm.202304403
摘要
Abstract Exploring efficient transition‐metal‐based electrocatalysts for oxygen evolution reaction (OER) is imperative but remain challenging for sustainable energy storage and conversion systems. Foreign species doping is a significant regulation strategy to enhance the intrinsic activity of host matrix. However, the potential relationship of structure‐activity caused by guest doping elements is seldom tracked systematically. In this case, both theoretical screening and experimental verification are complementarily employed to investigate the guest doping effects of ten first‐row transition metals (Sc∼Zn) on bimetallic NiCo layered double hydroxide (NiCo‐LDH). As a result, the optimized Fe‐doped NiCo‐LDH is identified as the most promising candidate toward alkaline electrocatalytic OER, which exhibits the quasi‐industrial current density of 1000 mA cm −2 at overpotential of 400 mV. Meanwhile, it also shows impressively long‐term stability of 500 h at 500 mA cm −2 with a negligible activity loss. Moreover, in situ electrochemical Raman spectroscopy unveils the dynamic structure evolution from pre‐catalytic state (Fe‐NiCo‐LDH) to metal oxyhydroxide (Fe‐(NiCo)OOH) during the oxidation reaction, and ab‐initio molecular dynamics simulations are further performed to confirm the thermodynamic stability of activated Fe‐(NiCo)OOH phase. This work provides a promising platform for exploring the critical role of transition metal guest doping on host matrix in developing industrially required OER electrocatalysts.
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