Erbium-doped cobalt oxide with an electron supply effect boosting electrocatalytic oxygen evolution

Abstract

Cobalt oxide for oxygen evolution reaction (OER) often suffers from over-oxidation and structural instability under alkaline conditions. We develop erbium (Er)-doped CoO microspheres with the assistance of L-aspartic acid, which show superior OER activity and stability by leveraging the electron supply effect of Er to optimize electron structure and prevent over-oxidation.