过电位
电催化剂
材料科学
密度泛函理论
催化作用
兴奋剂
氢
硼
电子结构
电化学
无机化学
计算化学
物理化学
电极
化学
光电子学
生物化学
有机化学
作者
Jing Wu,Qin Zhang,Ke Shen,Rong Zhao,Wenda Zhong,Chenfan Yang,Hui Xiang,Xuanke Li,Nianjun Yang
标识
DOI:10.1002/adfm.202107802
摘要
Abstract Cost‐effective transition metal sulfides (TMSs) are potential electrocatalysts for alkaline hydrogen evolution reaction (HER). However, free energies of hydrogen intermediates adsorbed on the TMSs (e.g., iron sulfides) are too negative, hindering their hydrogenase‐like catalytic activity. With an aim to improve the inherently catalytic activity of the TMSs, design of boron‐doped Fe 7 S 8 /FeS 2 (B‐Fe 7 S 8 /FeS 2 ) electrocatalysts on the base of the density functional theory (DFT) calculation results is first conducted in this work. Boron atoms doped into the Fe 7 S 8 /FeS 2 electrocatalysts are found to optimize the electronic structures of d ‐electrons of Fe atoms and p ‐electrons of S atoms. The interband energy separation between the d ‐orbitals of Fe atoms and the p ‐orbitals of S atoms in the B‐Fe 7 S 8 /FeS 2 electrocatalysts is thus shorter than that of a Fe 7 S 8 or FeS 2 electrocatalyst. The optimal B‐Fe 7 S 8 /FeS 2 electrocatalyst induces a boosted charge transfer process and features a low energy barrier of water dissociation and a high desorption efficiency of adsorbed hydrogen intermediates. In alkaline media, this HER electrocatalyst exhibits the overpotential of 113 mV to harvest a current density of 10 mA cm −2 . The proposed heteroatom‐doping is a feasible approach to modulate electronic structures of TMS electrocatalysts and further achieve their accelerated HER kinetics.
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