Defective TiO_(2)hollow nanospheres as photo-electrocatalysts for photo-assisted Li-O_(2)batteries

查看全文 作　　者：Hailiang [1]Jiao;Guiru [1]Sun;Yan [1]Wang;Zexu [1]Zhang;Zhao [1]Wang;Hairui [2]Wang;Haibo [1]Li;Ming [1]Feng 机构地区：[1]Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,China;[2]Key Laboratory of Preparation and Applications of Environmental Friendly Materials of the Ministry of Education,Jilin Normal University,Changchun 130103,China 出　　处：《Chinese Chemical Letters》索引2022年第33卷第8期,共5页 基　　金：supported by the National Natural Science Foundation of China(Nos.21978110,51772126,and 52171210);the Jilin Province Science and Technology Department Program(Nos.20200201187JC,20190201309JC,and YDZJ202101ZYTS047);the“13thfive-year”Science and Technology Project of Jilin Provincial Education Department(Nos.JJKH20200407KJ and JJKH20210444KJ);the Jilin Province Development and Reform Commission Program(No.2020C026-3)。 摘　　要：The large overpotential for conventional Li-O_(2) batteries is an enormous challenge,which impedes their practical application.Here,we prepare a defective TiO_(2)(Ov-TiO_(2)) hollow nanosphere as photoelectrocatalyst for photo-assisted Li-O_(2) batteries to reduce the overpotential.Under illumination,the oxygen vacancies as a charge separation center contribute to the separation of electrons and holes.The generated electrons could promote reducing O_(2) to Li_(2)O_(2) during oxygen reduction reaction(ORR)process,while the generated holes are beneficial to Li_(2)O_(2) decomposition during oxygen evolution reaction(OER)process.Additionally,the proper concentration of oxygen vacancies will decrease the recombination rate between electrons and holes.The photo-assisted Li-O_(2) batteries with Ov-TiO_(2)-650 exhibit advanced performances,such as the low overpotential(0.70 V),the fine rate capability,and the considerable reversibility accompanied with the formation/decomposition of Li_(2)O_(2).We expect that these results could open a new mind to design of highly efficient photo-electrocatalysts for photo-assisted Li-O_(2) battery. 关 键 词：TiO_(2) Hollow nanospheres Oxygen vacancies Photo-electrocatalyst Li-O_(2)battery