The formation of unsaturated IrO<sub>x</sub> in SrIrO<sub>3</sub> by cobalt-doping for acidic oxygen evolution reaction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38575606.
- Also identified by DOI 10.1038/s41467-024-46801-y and PMC identifier 10995174.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Electrocatalytic water splitting is a promising route for sustainable hydrogen production. However, the high overpotential of the anodic oxygen evolution reaction poses significant challenge. SrIrO<sub>3</sub>-based perovskite-type catalysts have shown great potential for acidic oxygen evolution reaction, but the origins of their high activity are still unclear. Herein, we develop a Co-doped SrIrO<sub>3</sub> system to enhance oxygen evolution reaction activity and elucidate the origin of catalytic activity. In situ experiments reveal Co activates surface lattice oxygen, rapidly exposing IrO<sub>x</sub> active sites, while bulk Co doping optimizes the adsorbate binding energy of IrO<sub>x</sub>. The Co-doped SrIrO<sub>3</sub> demonstrates high oxygen evolution reaction electrocatalytic activity, markedly surpassing the commercial IrO<sub>2</sub> catalysts in both conventional electrolyzer and proton exchange membrane water electrolyzer.