Pseudo-Pt Monolayer for Robust Hydrogen Oxidation

Tonghui Zhao; Mengting Li; Dongdong Xiao; Xiaoju Yang; Qihao Li; Lulu An; Zhiping Deng; Tao Shen; Mingxing Gong; Yi Chen; Gongwei Wang; Xu Zhao; Li Xiao; Xuan Yang; Li Li; Deli Wang

doi:10.1021/jacs.2c11907

Pseudo-Pt Monolayer for Robust Hydrogen Oxidation

J Am Chem Soc. 2023 Feb 3. doi: 10.1021/jacs.2c11907. Online ahead of print.

Authors

Tonghui Zhao¹, Mengting Li², Dongdong Xiao³, Xiaoju Yang¹, Qihao Li⁴, Lulu An¹, Zhiping Deng¹, Tao Shen¹, Mingxing Gong¹, Yi Chen¹, Gongwei Wang⁴, Xu Zhao¹, Li Xiao⁴, Xuan Yang¹, Li Li², Deli Wang¹

Affiliations

¹ Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan430074, China.
² The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Chongqing400044, China.
³ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing100190, China.
⁴ College of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources, Wuhan University, Wuhan430072, China.

PMID: 36734666
DOI: 10.1021/jacs.2c11907

Abstract

Heteroepitaxial core-shell structure is conducive to combining the advantages of the epilayer and the substrate, creating a novel multifunctionality for catalysis application. Herein, we report a pseudomorphic-Pt atomic layer (PmPt) epitaxially growing on an IrPd-core matrix (PmPt@IrPd/C) as an efficient and stable catalyst for alkaline hydrogen oxidation reaction that exhibits ∼29.2 times more mass activity enhancement than that of benchmark Pt/C. The PmPt@IrPd/C catalyst also gives rise to ∼25.0 times more enhancement than Pt/C during a 50,000-cycle accelerated stability test. This robust stability originates from the resistance to carbon corrosion owing to the stronger H₂O interaction instead of carbon oxide (CO_x) poison species, and the modulated hydroxyl (OH*) adsorption could inhibit the OH* species from shuffling the surface Pt atoms away from the substrate. Moreover, the anion-exchange membrane fuel cells assembled by PmPt@IrPd/C with an ultralow Pt loading of 0.009 mg_Pt cm^-2 in the anode can deliver a power density of 1.27 W cm^-2.