Affiliation:
1. College of Chemistry and Environmental Engineering Shenzhen University Shenzhen People's Republic of China
2. Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen People's Republic of China
3. Department of Mechanical and Materials Engineering The University of Western Ontario London Ontario Canada
Abstract
AbstractPt‐Ir catalysts have been widely applied in unitized regenerative fuel cells due to their great activity for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, the application of noble metals is seriously hindered by their high cost and low abundance. To reduce the noble metals loading and catalyst cost, the atomic layer deposition is applied to selectively surface anchoring of Ir single atoms (SA) on Pt nanoparticles (NP). With the formation of SA‐NP composite structure, the IrSA‐PtNP catalyst exhibits significantly improved performance, achieving 2.0‐ and 90‐times mass activity by comparison with the benchmark Pt/C catalyst for the ORR and OER, respectively. Density functional theory calculations indicate that the SA‐NP cooperation synergy endows the IrSA‐PtNP catalyst to surpass the bifunctional catalytic activity limit of Pt‐Ir NPs. This work provides a novel strategy for the construction of high‐performing dual catalyst through designing the single atom anchoring on NPs.image
Funder
Canada Research Chairs
National Natural Science Foundation of China
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
Canadian Light Source
Subject
Materials Science (miscellaneous),Physical and Theoretical Chemistry,Chemistry (miscellaneous)