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Research Article

Highly stable Pt3Ni ultralong nanowires tailored with trace Mo for the ethanol oxidation

Mingxuan Li1, Yandi Cai2, Jinjin Zhang3, Haixiao Sun1, Zhi Li1, Yujie Liu1, Xin Zhang1( ), Xiaoping Dai1, Fei Gao2, Weiyu Song1( )
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China
Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
Sinopec Zhenhai Refining&Chemical Company, Ningbo 315207, China
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Graphical Abstract

The application of Mo firmly nails the unstable Ni to the ultralong Pt3Ni nanowires, thus significantly improving the anti-agglomeration performance and the ethanol electrooxidation stability.

Abstract

Pt3Ni alloy structure is an effective strategy to accelerate ethanol oxidation reaction (EOR), while the stability in acid electrolyte is the fatal weakness and the current density still needs to be enhanced. Herein, ultralong Pt3Ni nanowires tailored by trace Mo (Mo/Pt3Ni NWs) were successfully synthesized by surfactant free method. The specific activity of the optimized catalyst was 2.66 mA·cm–2, which is approximately 2.16 and 4.6-fold that of Pt3Ni NWs and commercial Pt/C catalyst, respectively. Most importantly, the Mo/Pt3Ni NWs catalyst showed negligible structure degradation after 3,000 cycles (42 h) of durability test in 0.1 M HClO4 and 0.5 M ethanol, as compared to severe structural collapse and Ni dissolution for the pure Pt3Ni NWs. The density functional theory (DFT) calculation also confirmed that both the surface and subsurface Mo atom could form Pt-Mo and Ni-Mo bonds with Pt and Ni, which were stronger than Pt-Ni bonds, to pin the Ni atoms in the unstable position and suppress the dissolution of surface Ni. The findings of this study indicate a promising pathway for the design and engineering of durable alloy nanocatalysts for direct ethanol fuel cell applications.

Keywords

ternary Pt-based alloyone-dimensional nanowiresMo decorationelectronic effectdirect ethanol fuel cells

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 4,
April 2022
Pages 3230-3238
DOI: 10.1007/s12274-021-3952-4
Cite this article:
Li M, Cai Y, Zhang J, et al. Highly stable Pt3Ni ultralong nanowires tailored with trace Mo for the ethanol oxidation. Nano Research, 2022, 15(4): 3230-3238. https://doi.org/10.1007/s12274-021-3952-4
Topics:
Direct ethanol fuel cells (DEFC)
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Received: 12 September 2021
Revised: 17 October 2021
Accepted: 22 October 2021
Published: 12 December 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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