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Research Article

Phosphorus-doping-tuned PtNi concave nanocubes with high-index facets for enhanced methanol oxidation reaction

Aixin Fan1,3, Congli Qin1, Ruxia Zhao2, Haixiao Sun3, Hui Sun3, Xiaoping Dai3, Jin-Yu Ye4, Shi-Gang Sun4, Yanhong Lu1( ), Xin Zhang3( )
School of Chemistry & Material Science, Langfang Normal University, Langfang 065000, China
ShanDong Drug and Food Vacational Colleage, Weihai 255000, China
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing 102249, China
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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Abstract

Surface engineering has been found to be an efficient strategy to boost the catalytic performance of noble-metal-based nanocatalysts. In this work, a small amount of P was doped to the surface of PtNi concave cube (P-PtNi CNC). Interestingly, the P-PtNi CNC nanocatalyst shows an enhanced methanol oxidation reaction (MOR) performance with achieving 8.19 times of specific activity than that of comercial Pt/C. The electrochemical in situ Fourier transform infrared spectroscopy (FTIR) results reveal that the surface P doping promotes the adsorption energy of OH, enhancing the resistance against CO poisoning. Therefore, the intermediate adsorbed CO (COads) reacted with adsorbed OH (OHads) through the Langmuir–Hinshelwood (LH) mechanism to generate CO2 and release surface active sites for further adsorption. This work provides a promising strategy via the incorporation of non-metallic elements into the PtNi alloys bounded with high-index facets (HIFs) as efficient fuel cell catalysts.

Graphical Abstract

This work provides an effective strategy for fine-tuning PtNi alloy nanocrystals with high-index facets (HIFs) via surface P doping to boost the electro-oxidation reaction of methanol (CH3OH).

Keywords

P dopinghigh-index facetsmethanol oxidation reactionin situ Fourier transform infrared spectroscopy

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Nano Research
Volume 15 Issue 8,
August 2022
Pages 6961-6968
DOI: 10.1007/s12274-022-4210-0

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Cite this article:
Fan A, Qin C, Zhao R, et al. Phosphorus-doping-tuned PtNi concave nanocubes with high-index facets for enhanced methanol oxidation reaction. Nano Research, 2022, 15(8): 6961-6968. https://doi.org/10.1007/s12274-022-4210-0
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Received: 05 January 2022
Revised: 25 January 2022
Accepted: 03 February 2022
Published: 28 May 2022
© Tsinghua University Press 2022