Continuous Fe^(3+)releasing enabled complete reconstruction of Ni-based MOF for promoted water oxidation in industrial alkali  

作　　者：Zhaojian Wang Wei Zhang Wenzhong Huang Ruohan Yu Changliang Chen Liqiang Mai Liang Zhou 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [2]Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572000,China [3]Hubei Longzhong Laboratory,Wuhan University of Technology(Xiangyang Demonstration Zone),Xiangyang 441000,China

出　　处：《Science China Chemistry》2024年第9期2949-2957,共9页中国科学（化学英文版）

基　　金：supported by the China Postdoctoral Science Foundation(2022T150502);the National Energy-Saving and Low-Carbon Materials Production and Application Demonstration Platform Program(TC220H06N)。

摘　　要：Most oxygen evolution reaction(OER)electrocatalysts show poor stability under industrial alkaline conditions(20–30 wt.%KOH).Therefore,it is essential to develop stable,efficient,and low-cost OER catalysts for industrial water electrolysis.Herein,we present a straightforward approach for the complete electrochemical reconstruction of Ni-BDC,a Ni-based metal-organic framework,for OER.This method involves the continuous release of Fe^(3+)from Fe foam counter electrode in a high-concentration(6.0 M,25 wt.%)KOH solution.The continuously Fe^(3+)releasing not only realizes in situ Fe^(3+)doping,but also introduces abundant defects in the obtained catalyst during cyclic voltammetry activation,thereby accelerating the electrochemical reconstruction.The reconstructed OER catalyst(Fe-doped nickel hydroxide/oxyhydroxide nanosheets supported on Ni foam,Fe-NiO_(x)(OH)y/NF)manifests a low overpotential of 217 mV at 10 mA cm^(-2)and 263 m V at 100 m A cm^(-2)in 1.0 M KOH.Noteworthy,the Fe-NiO_(x)(OH)_(y)/NF also demonstrates high stability in 30 wt.%KOH.This strategy of regulating the electrochemical reconstruction process sheds light on the construction of stable and efficient OER catalysts for industrial water electrolysis.

关 键 词：oxygen evolution reaction industrial alkaline conditions metal-organic framework complete reconstruction 

分 类 号：O643.36[理学—物理化学]