Hierarchical Co(OH)2 Dendrite Enriched with Oxygen Vacancies for Promoted Electrocatalytic Oxygen Evolution Reaction.

ABSTRACT: It is critical to develop efficient oxygen evolution reaction (OER) catalysts with high catalytic properties for overall water splitting. Electrocatalysts with enriched vacancies are crucial for enhancing the catalytic activity of OER through defect engineering. We demonstrated the dealloying method in a reducing alkaline solution using the Co5Al95 alloy foil as a precursor to produce a new oxygen-vacancy-rich cobalt hydroxide (OV-Co(OH)2) hierarchical dendrite. The as-synthesised OV-Co(OH)2 showed superior electrocatalytic activities toward OER when compared to pristine cobalt hydroxide (p-Co(OH)2), which had a low onset overpotential of only 242 mV and a small Tafel slope of 64.9 mV dec-1. Additionally, for the high surface area provided by the hierarchical dendrite, both p-Co(OH)2 and O

SUBMITTER: Zhou T 

PROVIDER: S-EPMC9026458 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature