Electrochemical-Method-Induced Strong Metal-Support Interaction in Pt-CNT@SnO₂ for CO-Tolerant Hydrogen Oxidation Reaction

Authors

Shen-Zhou Li, State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, China
Zi-Jie Lin, State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, China
Qi-An Chen, State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, China
Zhao Cai, Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China
Qing Li, State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, China

Document Type

Article

Corresponding Author(s)

Qing Li(qing_li@hust.edu.cn)

Abstract

Inducing the classic strong metal-support interaction (SMSI) is an effective approach to enhance the performance of supported metal catalysts by encapsulating the metal nanoparticles (NPs) with supports. Conventional thermal reduction method for inducing SMSI processes is often accompanied by undesirable structural evolution of metal NPs. In this study, a mild electrochemical method has been developed as a new approach to induce SMSI, using the cable structured core@shell CNT@SnO₂ loaded Pt NPs as a proof of concept. The induced SnO_x encapsulation layer on the surface of Pt NPs can protect Pt NPs from the poisoned of CO impurity in hydrogen oxidation reaction (HOR), and the HOR current density could still maintain 85% for 2000 s with 10000 ppm CO in H₂, while the commercial Pt/C is completely inactivated. In addition, the electrons transfer from SnO_x to Pt NPs improved the HOR activity of the E-Pt-CNT@SnO₂, and the excellent exchange current density is 1.55 A·mg_Pt^-1. In situ Raman spectra and theoretical calculations show that the key to the electrochemical-method-induced SMSI is the formation of defects and the migration of SnO_x caused by the electrochemical redox operation and the weakening the Sn-O bond strength by Pt NPs.

Graphical Abstract

Keywords

Strong metal-support interaction, Pt, supported metal catalyst, hydrogen oxidation reaction, CO tolerance

DOI

10.61558/2993-074X.3474

Online Date

5-30-2024

Recommended Citation

Shen-Zhou Li , Zi-Jie Lin , Qi-An Chen , Zhao Cai and Qing Li . Electrochemical-Method-Induced Strong Metal-Support Interaction in Pt-CNT@SnO2 for CO-Tolerant Hydrogen Oxidation Reaction[J]. Journal of Electrochemistry, doi: 10.61558/2993-074X.3474.