Ni²⁺ -Directed Anisotropic Growth of PtCu Nested Skeleton Cubes Boosting Electroreduction of Oxygen.

ABSTRACT: Structure-controlled Pt-based nanocrystals have the great potential to provide a flexible strategy for improving the catalysis of the oxygen reduction reaction (ORR). Here, a new synthetic approach is developed to tune the 3D structure of Pt-based alloys, and switch a synthetic reaction which produces solid PtCu octahedral stars (OSs) to produce PtCu nested skeleton cubes (NSCs) by simple addition of Ni(acac)₂ . In particular, Ni²⁺ -guided anisotropic growth is observed to generate the nested skeleton structure in PtCu NSCs. Ni²⁺ , though absent from the nanoalloys, not only endows faster Cu reduction kinetics but also acts as a structure-directing agent. Moreover, it is shown that acetic acid treatment of PtCu NSCs/C exposes Pt-rich surface with a fine-tun

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC9108632 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature