α-MnO2 Nanowire-Anchored Highly Oxidized Cluster as a Catalyst for Li-O2 Batteries: Superior Electrocatalytic Activity and High Functionality

Abstract

An effective chemical way to optimize the oxygen electrocatalyst and Li-O-2 electrode functionalities of metal oxide can be developed by the control of chemical bond nature with the surface anchoring of highly oxidized selenate (SeO42-) clusters. The bond competition between (Se6+-O) and (Mn-O) bonds is quite effective in stabilizing Jahn-Teller-active Mn3+ state and in increasing oxygen electron density of alpha-MnO2 nanowire (NW). The selenate-anchored alpha-MnO2 NW shows excellent oxygen electrocatalytic activity and electrode performance for Li-O-2 batteries, which is due to the improved charge transfer kinetics and reversible formation/decomposition of Li2O2. The present study underscores that the surface anchoring of highly oxidized cluster can provide a facile, effective way of improving the oxygen electrocatalyst and electrochemical performances of nanostructured metal oxide in Li-O-2 cells.