To address the sluggish kinetics and limited current density in the alkaline hydrogen evolution reaction(HER),we designed and synthesized dandelion-like V-doped CoP anchored on carbon cloth(V-CoP-X)via a MOF-derived s...To address the sluggish kinetics and limited current density in the alkaline hydrogen evolution reaction(HER),we designed and synthesized dandelion-like V-doped CoP anchored on carbon cloth(V-CoP-X)via a MOF-derived strategy involving hydrothermal growth and subsequent phosphidation.By precisely controlling the V content in the MOF precursor,we achieve tunable morphologies of V-CoP materials.Experimental analyses reveal that Lewis acid sites of V promote electron transfer and adjust the d-band centers of V-CoP.According to the results of experimental and density functional theory(DFT)calculations,the V-doped CoP lowers the water dissociation energy in alkaline media and optimizes the adsorption energy for H^(*)(ΔG_(H^(*))).These synergistic effects accelerate water dissociation kinetics as well as optimize adsorption and desorption behavior of H^(*),leading to improved HER activity in 1 M KOH and 0.5 M H_(2)SO_(4).As a result,the optimal V-CoP electrode exhibits exceptional HER performance in diverse electrolytes,requiring low overpotentials of 69,63 and 89 mV to obtain 10 mA cm^(-2)as well as 212,254 and 401 mV at 500 mA cm^(-2)in 1 M KOH,1 M KOH+0.5 M NaCl and 0.5 M H_(2)SO_(4),respectively.Remarkably,V-doped CoP possesses excellent long-term stability at large current density.This work presents a highperformance HER electrocatalyst while providing fundamental insights into the role of V doping in enhancing reaction kinetics.展开更多
基金support provided by the International Cooperation Project of Jilin Province,China(20230402055GH)the Natural Science Foundation of Jilin Province,China(No.20250102092JC)the Key R&D Project on Functional Development of Major Research Instruments of Jilin Province,China(No.20250206056ZP).
文摘To address the sluggish kinetics and limited current density in the alkaline hydrogen evolution reaction(HER),we designed and synthesized dandelion-like V-doped CoP anchored on carbon cloth(V-CoP-X)via a MOF-derived strategy involving hydrothermal growth and subsequent phosphidation.By precisely controlling the V content in the MOF precursor,we achieve tunable morphologies of V-CoP materials.Experimental analyses reveal that Lewis acid sites of V promote electron transfer and adjust the d-band centers of V-CoP.According to the results of experimental and density functional theory(DFT)calculations,the V-doped CoP lowers the water dissociation energy in alkaline media and optimizes the adsorption energy for H^(*)(ΔG_(H^(*))).These synergistic effects accelerate water dissociation kinetics as well as optimize adsorption and desorption behavior of H^(*),leading to improved HER activity in 1 M KOH and 0.5 M H_(2)SO_(4).As a result,the optimal V-CoP electrode exhibits exceptional HER performance in diverse electrolytes,requiring low overpotentials of 69,63 and 89 mV to obtain 10 mA cm^(-2)as well as 212,254 and 401 mV at 500 mA cm^(-2)in 1 M KOH,1 M KOH+0.5 M NaCl and 0.5 M H_(2)SO_(4),respectively.Remarkably,V-doped CoP possesses excellent long-term stability at large current density.This work presents a highperformance HER electrocatalyst while providing fundamental insights into the role of V doping in enhancing reaction kinetics.
