NaBH4-induced phase transition of CoSe_(2) with abundant Se deficiency for acidic oxygen reduction to hydrogen peroxide  

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作  者:Cai-Di Han Yong-Chao Zhang Qian Zhang Jin-Ting Wu Jian Gao Ji-Jun Zou Xiao-Dong Zhu 

机构地区:[1]State Key Laboratory Base of Eco-Chemical Engineering College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao,266042,China [2]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin,300072,China

出  处:《Rare Metals》2024年第2期500-510,共11页稀有金属(英文版)

基  金:This study was financially supported by the Natural Science Foundation of Shandong(Nos.ZR2022QB236 and ZR2020KB011);the National Natural Science Foundation of China(Nos.21878063 and 22005168);Taishan Scholars Program(No.tsqn201909119);China Postdoctoral Science Foundation(No.2022M722363).

摘  要:Electrocatalytic oxygen reduction(ORR)via the 2e−pathway to form H_(2)O_(2) in acidic medium has attracted extensive attention.However,the low activity,insufficient selectivity and high cost of catalysts have been the bottlenecks.Herein,CoSe_(2) with abundant Se deficiency was synthesized by a simple hydrothermal method,and the addition of NaBH4-induced CoSe_(2) phase transition from orthorhombic to cubic phase with more Se deficiency.The cubic phase CoSe_(2) 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 H_(2)O_(2).The onset potential is as low as 0.73 V vs.reversible hydrogen electrode(RHE),the H_(2)O_(2) selectivity is 84%(0 V vs.RHE),and the average electron transfer number is about 2.3.Furthermore,the H_(2)O_(2) 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 H_(2)O_(2) and organic pollutant degradation using the electron-Fenton process.

关 键 词:Se defected CoSe_(2) Crystal phase transition ELECTROCATALYSIS Acidic oxygen reduction Hydrogen peroxide 

分 类 号:TQ123.6[化学工程—无机化工] TQ426

 

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