论文类型：Research Article
第一作者：Lin,Zijie
通讯作者：Li,Qing
合写作者：Huang, Yunhui,Han, Jiantao,Lu, Gang,Xie, Linfeng, Xuan,Liang, Jiashun,Li, Shenzhou,Liu, Junyi
发表刊物：Advanced Functional Materials
所属单位：华中科技大学
刊物所在地：德国
文献类型：Article
卷号：33
期号：11
页面范围：2211638
ISSN号：1616-3028
关键字：Catalyst Supports; Fuel Cells; Heterostructures; Oxygen Reduction Reactions; Tin Oxides
DOI码：10.1002/adfm.202211638
发表时间：2023-01-01
影响因子：18.5
摘要：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.