摘要
Defect engineering on metal-organic frameworks(MOFs)provides high flexibility to rationally design advanced oxygen evolution reaction(OER)catalysts with low overpotential and high stability.However,fundamental understanding the effect of defect concentration on catalytic OER activity is still quite ambiguous.Herein,the Co-MOF-Dx catalysts with regulated oxygen defects concentration are deliberately constructed via coupling one-pot solvothermal synthesis with NaBH_(4)chemical reduction process.Experimental findings propose that the oxygen defect concentration within Co-MOF-Dx gradually increases with raising the NaBH_(4)content,which could provide a flexible platform to tailor the electronic structure around active Co site and optimize adsorption/desorption capacity of oxygen intermediates.When the introduction content of NaBH_(4)is up to 5 mg,the resulting abundant unsaturated coordination defects could endow the Co-MOF-D5 catalyst with optimized electronic structure and more exposed active sites for improving charge transfer and adsorption/desorption capacity.It is found that the optimized Co-MOF-D5 can drive the current density of 10 mA cm^(-2)only at a low overpotential of 300 mV with the small Tafel slope of 53.1 mV dec^(-1)in alkaline medium.This work sheds light on the way for the development of high-performance MOF catalysts via modulating defect concentration.
基金
supported by the National Natural Science Foundation of China(52261145700,22279124)
the Natural Science Foundation of Shandong Province(ZR202ZD30)
Qingdao New Energy Shandong Laboratory Open Project(QNESL OP202307)
作者简介
Corresponding author:Minghua Huang,E-mail address:huangminghua@ouc.edu.cn;Tengjia Ni,contributed equally to this work;Xianbiao Hou,contributed equally to this work
