title: Activity and Stability of Ruddlesden-Popper-Type La(n+1) Ni(n) O(3n+1) (n=1, 2, 3, and ∞) Electrocatalysts for Oxygen Reduction and Evolution Reactions in Alkaline Media.
abstract: Increasing energy demands have stimulated intense research activity on cleaner energy conversion such as regenerative fuel cells and reversible metal-air batteries. It is highly challenging but desirable to develop low-cost bifunctional catalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), the lack of which is currently one of the major limiting components towards commercialization of these technologies. Here, we have conducted a systematic study on the OER and ORR performances of the Ruddlesden-Popper family of La(n+1)Ni(n) O(3n+1) (n=1, 2, 3, and ∞) in an alkaline medium for the first time. It is apparent that the Ni-O bond lengths and the hyperstoichiometric oxides in the rock-salt layers correlate with the ORR activities, whereas the OER activities appear to be influenced by the OH(-) content on the surface of the compounds. In our case, the electronic configuration fails to predict the electrocatalytic activity of these compounds. This work provides guidelines to develop new electrocatalysts with improved performances.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Yu
authors.affiliation: Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
authors.forename: Jaka
authors.initials: J
authors.lastname: Sunarso
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China.
authors.forename: Yinlong
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China.
authors.forename: Ran
authors.initials: R
authors.lastname: Ran
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China. zhouwei1982@njtech.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China. shaozp@njtech.edu.cn.|College of Energy, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China. shaozp@njtech.edu.cn.
authors.forename: Zongping
authors.initials: Z
authors.lastname: Shao
keywords: Ruddlesden-Popper-type oxides; bifunctional electrocatalysts; non-noble metal catalysts; oxygen evolution reaction; oxygen reduction reaction