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

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 ox...

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Published in:Nano research 2022-08, Vol.15 (8), p.6961-6968
Main Authors: Fan, Aixin, Qin, Congli, Zhao, Ruxia, Sun, Haixiao, Sun, Hui, Dai, Xiaoping, Ye, Jin-Yu, Sun, Shi-Gang, Lu, Yanhong, Zhang, Xin
Format: Article
Language:English
Subjects:
Adsorption
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Carbon dioxide
Carbon monoxide poisoning
Catalysts
Chemistry and Materials Science
Condensed Matter Physics
Doping
Electrocatalysis
Electrocatalysts
Electrochemistry
Fourier transforms
Fuel cells
Infrared spectroscopy
Intermetallic compounds
Materials Science
Methanol
Nanocatalysis
Nanocrystals
Nanotechnology
Nanowires
Noble metals
Oxidation
Phosphorus
Research Article
Spectrum analysis
Surface chemistry
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Summary: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 (CO ads ) reacted with adsorbed OH (OH ads ) through the Langmuir—Hinshelwood (LH) mechanism to generate CO 2 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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-022-4210-0