Cobalt selenide(CoSe_(2))anchored monodisperse Pt presents good acidic 2e^(-)oxygen reduction reaction(ORR)performance;however,conventional preparation methods can only yield ultra-low content of Pt atom catalysts.It ...Cobalt selenide(CoSe_(2))anchored monodisperse Pt presents good acidic 2e^(-)oxygen reduction reaction(ORR)performance;however,conventional preparation methods can only yield ultra-low content of Pt atom catalysts.It is necessary to design catalysts with a high loading of monodisperse Pt to improve the activity and selectivity.Here,we reported anchoring highly reactive Pt atoms by constructing surface Co vacancies on CoSe_(2)(Pt_(1)/md-CoSe_(2)),thereby increasing the co ntent of Pt atoms.The monodisperse Pt is not only a reactive active site but also helps to improve the intrinsic activity of Co around Pt with a suitable electronic structu re,which contributes to the simultaneous enhancement of~*O_(2) adsorption and lowering of the reaction activation energy,accelerating the 2e^(-)ORR kinetics.The Pt_1/md-CoSe_(2) with a 0.2 wt%Pt exhibits high performa nce of electrocatalytic acidic 2e^(-)ORR.The H_(2)O_(2) yield is 1160.2 mmol g_(cat)^(-1).h^(-1)with a Faraday efficiency(FE)of 95.2%(0 V vs.RHE)at 0.1 M HClO_(4),superior to most of the reported literature.Moreover,the catalyst did not deactivate after a stability test of 30 h at the high current density of 100 mA cm^(-2).This work provides guidance for designing catalysts with applications and understanding the action mechanism of monodisperse Pt atoms.展开更多
基金financial support from the National Natural Science Foundation of China(22408196)financial support from the National Natural Science Foundation of China(22379082)+2 种基金the Natural Science Foundation of Shandong(ZR2022QB236)the supported by the State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology(Grant No.MJNYSKL202402)the Taishan Scholars Program(tsqn201909119)。
文摘Cobalt selenide(CoSe_(2))anchored monodisperse Pt presents good acidic 2e^(-)oxygen reduction reaction(ORR)performance;however,conventional preparation methods can only yield ultra-low content of Pt atom catalysts.It is necessary to design catalysts with a high loading of monodisperse Pt to improve the activity and selectivity.Here,we reported anchoring highly reactive Pt atoms by constructing surface Co vacancies on CoSe_(2)(Pt_(1)/md-CoSe_(2)),thereby increasing the co ntent of Pt atoms.The monodisperse Pt is not only a reactive active site but also helps to improve the intrinsic activity of Co around Pt with a suitable electronic structu re,which contributes to the simultaneous enhancement of~*O_(2) adsorption and lowering of the reaction activation energy,accelerating the 2e^(-)ORR kinetics.The Pt_1/md-CoSe_(2) with a 0.2 wt%Pt exhibits high performa nce of electrocatalytic acidic 2e^(-)ORR.The H_(2)O_(2) yield is 1160.2 mmol g_(cat)^(-1).h^(-1)with a Faraday efficiency(FE)of 95.2%(0 V vs.RHE)at 0.1 M HClO_(4),superior to most of the reported literature.Moreover,the catalyst did not deactivate after a stability test of 30 h at the high current density of 100 mA cm^(-2).This work provides guidance for designing catalysts with applications and understanding the action mechanism of monodisperse Pt atoms.
