Regulating the Electronic Structure of Ruddlesden-Popper-Type Perovskite by Chlorine Doping for Enhanced Oxygen Evolution Activity

Aniondoping engineering was adopted in Ruddlesden-Popper-typeperovskite SrLaCoO4 for improved oxygen evolution performance. Developing economical, efficient, and durable oxygenevolutioncatalysts is crucial for achieving sustainable energy conversion andstorage. Ruddlesden-Popper-type perovskite oxides are at theforefront of oxygen evolution reaction (OER) research. However, theiractivity and stability are far from satisfactory. Therefore, we emphasizethe paradigm shift in designing efficient perovskite-type OER catalyststhrough anion defect engineering. The Cl anion-doped A(2)BO(4)-type perovskite oxides, SrLaCoO4-x Cl x (SLCOCl x ), were employed as highly efficient OER catalysts,wherein Cl could tune the electronic structure of SrLaCoO4 (SLCO) to enhance the OER activity effectively. Especially, SLCOCl0.15 demonstrates significantly enhanced OER activity, andthe overpotential is only 370 mV at 10 mA & BULL;cm(-2), which is significantly better than that of SLCO (510 mV). As confirmedby experience results and density functional theory (DFT) calculation,due to the doping of Cl, obviously increasing the ratio of Co2+/Co3+, more abundant oxygen vacancies (O-2 (2-)/O-) are generated, and theelectrical conductivity is increased, which together promote the improvementof OER activity.

Automated summary

Anion doping engineering was used to improve the oxygen evolution performance of Ruddlesden-Popper-type perovskite SrLaCoO4. Developing efficient and durable oxygen evolution catalysts is crucial for sustainable energy conversion and storage. The Cl anion-doped perovskite oxides, SrLaCoO4-x Cl x (SLCOCl x ), were found to be highly efficient OER catalysts, with SLCOCl0.15 demonstrating significantly enhanced OER activity due to the tuning of electronic structure and generation of oxygen vacancies.