Boosting oxygen reduction activity and enhancing stability through structural transformation of layered lithium manganese oxide.

ABSTRACT: Structural degradation in manganese oxides leads to unstable electrocatalytic activity during long-term cycles. Herein, we overcome this obstacle by using proton exchange on well-defined layered Li₂MnO₃ with an O3-type structure to construct protonated Li_2-xH_xMnO_3-n with a P3-type structure. The protonated catalyst exhibits high oxygen reduction reaction activity and excellent stability compared to previously reported cost-effective Mn-based oxides. Configuration interaction and density functional theory calculations indicate that Li_2-xH_xMnO_3-n has fewer unstable O 2p holes with a Mn^3.7+ valence state and a reduced interlayer distance, originating from the replacement of Li by H. The former i

SUBMITTER: Zhong X 

PROVIDER: S-EPMC8149866 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature