title: Nickel-Doped La0.8Sr0.2Mn(1-x)Ni(x)O3 Nanoparticles Containing Abundant Oxygen Vacancies as an Optimized Bifunctional Catalyst for Oxygen Cathode in Rechargeable Lithium-Air Batteries.
abstract: In this work, Ni-doped manganite perovskite oxides (La0.8Sr0.2Mn(1-x)Ni(x)O3, x = 0.2 and 0.4) and undoped La0.8Sr0.2MnO3 were synthesized via a general and facile sol-gel route and used as bifunctional catalysts for oxygen cathode in rechargeable lithium-air batteries. The structural and compositional characterization results showed that the obtained La0.8Sr0.2Mn(1-x)Ni(x)O3 (x = 0.2 and 0.4) contained more oxygen vacancies than did the undoped La0.8Sr0.2MnO3 as well as a certain amount of Ni(3+) (eg = 1) on their surface. The Ni-doped La0.8Sr0.2Mn(1-x)Ni(x)O3 (x = 0.2 and 0.4) was provided with higher bifunctional catalytic activities than that of the undoped La0.8Sr0.2MnO3. In particular, the La0.8Sr0.2Mn0.6Ni0.4O3 had a lower total over potential between the oxygen evolution reaction and the oxygen reduction reaction than that of the La0.8Sr0.2MnO3, and the value is even comparable to that of the commercial Pt/C yet is provided with a much reduced cost. In the lithium-air battery, oxygen cathodes containing the La0.8Sr0.2Mn0.6Ni0.4O3 catalyst delivered the optimized electrochemical performance in terms of specific capacity and cycle life, and a reasonable reaction mechanism was given to explain the improved performance.
authors.affiliation: School of Chemistry and Chemical Engineering, Hefei University of Technology , Hefei 230009, PR China.
authors.forename: Zhaodong
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Austin , 1 University Station, C2201, Austin, Texas 78712, United States.
authors.forename: Ya
authors.initials: Y
authors.lastname: You
authors.affiliation: School of Chemistry and Chemical Engineering, Hefei University of Technology , Hefei 230009, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yuan
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190, PR China.
authors.forename: Ya-Xia
authors.initials: YX
authors.lastname: Yin
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Austin , 1 University Station, C2201, Austin, Texas 78712, United States.
authors.forename: Yu-Tao
authors.initials: YT
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Hefei University of Technology , Hefei 230009, PR China.|Department of Mechanical Engineering, The University of Texas at Austin , 1 University Station, C2201, Austin, Texas 78712, United States.|Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190, PR China.
authors.forename: Sen
authors.initials: S
authors.lastname: Xin
authors.affiliation: School of Chemistry and Chemical Engineering, Hefei University of Technology , Hefei 230009, PR China.|CAS Key Laboratory of Materials for Energy Conversion , Hefei 230026, PR China.
authors.forename: Dawei
authors.initials: D
authors.lastname: Zhang
keywords: oxygen evolution reaction; oxygen reduction reaction; oxygen vacancy; perovskite; rechargeable lithium−air battery