化学
塔菲尔方程
电催化剂
过电位
镍
电解
析氧
咪唑酯
催化作用
分解水
沸石咪唑盐骨架
电解水
化学工程
煅烧
无机化学
电化学
物理化学
电极
金属有机骨架
有机化学
吸附
电解质
工程类
光催化
生物化学
作者
Xiaoxi Li,Jiajia Li,Dilnur Kurbanjan,Tianhao Yu,Hong Du
摘要
Oxygen evolution reaction (OER), as a multi‐step coupled anode reaction, is more sluggish in kinetics than electrocatalytic hydrogen evolution reaction (HER). In order to overcome the potential barrier in OER, it is necessary to develop high‐efficient non‐noble metal catalysts for energy utilization. In this work, several NiCo‐ZIF materials with different molar ratios of Ni and Co were prepared by doping Ni 2+ in the preparation of ZIF‐67 via a simple room temperature stirring method. After that, NiCo‐ZIF was calcined at 350°C in a muffle furnace to obtain corresponding Ni‐doped Co 3 O 4 (Ni‐Co 3 O 4 ). Ni‐Co 3 O 4 catalyst exhibits a low overpotential (η ≈ 203 mV @10 mA cm −2 ), a small Tafel slope (111.0 mV dec −1 ) and prominent stability for OER in 1 M KOH solution, which is higher than for a commercially available Ir/C electrocatalyst (η ≈ 350 mV @10 mA cm −2 ). The higher electrochemical performance should be largely ascribed to the introduction of oxygen vacancies resulting from the Ni doping, which leads to the improved electrochemical active surface area (122.81 mF cm −2 ) and the topological structure of the dodecahedron, which is in favor of the good contact area between the catalyst and the electrolyte. The design and synthesis of ZIF‐derived catalyst in this work create a significative method to prepare efficient OER electrocatalysts.
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