双金属片
塔菲尔方程
过电位
析氧
离子液体
催化作用
金属有机骨架
材料科学
金属
离子键合
无机化学
化学
化学工程
离子
物理化学
电极
有机化学
电化学
冶金
吸附
工程类
作者
Ru Li,Qi Hu,Fenghongkang Pan,Wei Xie,Lihui Zhou,Honglai Liu,Jun Hu
标识
DOI:10.1002/celc.202300103
摘要
Abstract Coordinatively unsaturated metal (CUM) sites in metal organic frameworks (MOFs) have demonstrated distinct catalytic activities, yet remain great challenges in their designing and engineering. Herein, a novel “Coordination Geometric Hindrance” approach based on ionic liquids (ILs) is proposed for defects construction in bimetallic MOF, of which the steric effect of competitively coordinated anions of imidazole ILs ([EMIM]X) enables the interference with the ordered growth of bimetallic NiFe‐MOFs. Specifically, the PF 6 − anion displays the strongest binding energy with metals Ni and Fe, accordingly, facilitates the formation of CUM sites in NiFe‐BTC/IL‐PF 6 . Taking both advantages of CUM defects and good intrinsic conductivity of IL, NiFe‐BTC/IL‐PF 6 achieves a superior electrocatalytic performance in the oxygen evolution reaction (OER), with the overpotential as low as 210 mV at 10 mA cm −2 , and the Tafel slope of 103 mV dec −1 , thus, giving an 18‐fold larger TOF of the commercial OER catalyst of RuO 2 .
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