Abstract
Electrocatalytic oxygen reduction(ORR)via the 2e-pathway to form H2O2 in acidic medium has attracted extensive attention.However,the low activity,insufficient selectivity and high cost of catalysts have been the bottlenecks.Herein,CoSe2 with abundant Se deficiency was synthesized by a simple hydrothermal method,and the addition of NaBH4-induced CoSe2 phase transition from orthorhombic to cubic phase with more Se deficiency.The cubic phase CoSe2 with abundant Se deficiency can effectively regulate the surface electronic structure with suitable binding energies of*OOH and*O,which shows high activity,selectivity and long-term stability for acidic ORR to H2O2.The onset potential is as low as 0.73 V vs.reversible hydrogen electrode(RHE),the H2O2 selectivity is 84％(0 V vs.RHE),and the average electron transfer number is about 2.3.Furthermore,the H2O2 yield measured using a flow cell is as high as 115.92 mmol·gcat.-1·h-1 and the Faradaic efficiency is 70％at 0 V vs.RHE,which presents high potential in electrocatalytic acidic ORR to H2O2 and organic pollutant degradation using the electron-Fenton process.
基金项目
山东省自然科学基金(ZR2022QB236)
山东省自然科学基金(ZR2020KB011)
国家自然科学基金(21878063)
国家自然科学基金(22005168)
山东省"泰山学者"项目(tsqn201909119)
中国博士后科学基金(2022M722363)
NETL
NSTL
万方数据