Indexed by: Research Article

First Author: Lin,Zijie

Correspondence Author: Li,Qing

Co-author: Huang, Yunhui,Han, Jiantao,Lu, Gang,Xie, Linfeng, Xuan,Liang, Jiashun,Li, Shenzhou,Liu, Junyi

Journal: Advanced Functional Materials

Affiliation of Author(s): 华中科技大学

Place of Publication: 德国

Document Type: Article

Volume: 33

Issue: 11

Page Number: 2211638

ISSN No.: 1616-3028

Key Words: Catalyst Supports; Fuel Cells; Heterostructures; Oxygen Reduction Reactions; Tin Oxides

DOI number: 10.1002/adfm.202211638

Date of Publication: 2023-01-01

Impact Factor: 18.5

Abstract: The stability of Pt-based catalysts for oxygen reduction reaction (ORR) in hydrogen fuel cells is seriously handicapped by the corrosion of their carbon supports at high potentials and acidic environments. Herein, a novel SnS2/SnO2 hetero-structured support is reported for Pt nanoparticles (NPs) as the ORR catalyst, where Pt NPs are mainly deposited at the interfaces of SnS2 and SnO2 moieties. The Pt-support interactions, which can be tuned by the concentration of the heterointerfaces, can accelerate the electronic transfer and enrich the electron density of Pt with a favorable shift of the d-band center. In electrochemical measurements, the ORR mass activity (MA) of the optimal Pt-SnS2/SnO2 catalyst at 0.9 V versus RHE (0.40 A mgPt−1) is four times higher than that of Pt/C. As for the stability, the electrochemical active surface area and MA of Pt-SnS2/SnO2 are only decreased by 18.2% and 23.7% after 50 000 potential cycles at a high potential region (1.0–1.6 V), representing the best ORR stability among the reported Pt-based catalysts. Density functional theory calculations indicate that the binding energy and migration barrier of Pt atom/cluster on the SnS2/SnO2 heterojunction are much higher relative to other supports, accounting for the outstanding stability of the catalyst.