4.7 Article

Structural evolution of PtCu nanoframe for efficient oxygen reduction reactions

Journal

JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 922, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.116756

Keywords

ORR; PtCu; Nanoframes; Synergistic effects

Funding

  1. National Natural Science Foundation of China [51871088, 21603052, 51771068, 51771067]
  2. Natural Science Foundation of Hebei Province [B2019202194, E2018202082, B201820167]

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This paper reports the synthesis of high-active PtCu alloy nanoframes and investigates their electrocatalytic performance for oxygen reduction reactions. The results show that the alloy PtCu nanoframes exhibit higher activity and stability compared to commercial Pt/C.
Advances in proton exchange membrane fuel cells require Pt-based catalysts with high catalytic activity and stability. However, due to the expensiveness of Pt, scholars are mainly finding ways to improve the catalytic performance and decrease Pt usage. In this paper, the synthesis of high-active PtCu alloy nanoframes is reported. The nanoframes are prepared by the electric displacement reaction between the Cu nanoplate (Cu NP) template and the Pt precursor, and the high-active PtCu alloy nanoframes are obtained by further etching. The synergistic effect of alloy PtCu nanoframes shows excellent electrocatalytic performance for oxygen reduction reactions, with PtCu high-active nanoframes(PtCu HNF) having approximately 1.4 times the mass activity of commercial Pt/C and exhibiting high stability and tolerance in acidic ORR. Due to the increase in the number of surface active sites and the synergistic effect of bimetals, the activity and stability of the catalyst are significantly improved.

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