Journal
NANO ENERGY
Volume 71, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104623
Keywords
Pt-based ultrathin nanowire; Interatomic Pt-Rh site; In situ FTIR; CO-tolerance; Methanol oxidation reaction
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Funding
- National Natural Science Foundation of China [21771067, 21931009]
- Natural Science Foundation of Fujian Province [2017J06005]
- Program for New Century Excellent Talents in Fujian Province University
- Scientific Research Funds of Huaqiao University
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Inferior stability and anti-poisoning capacity of Pt-based ultrathin nanowires (NWs) are critical weaknesses under detrimental acidic running conditions for proton-exchange membrane fuel cell applications due to their energetic surface. Here 1.5-nm-thin quatermetallic PtCoNiRh NWs with high atomic-exposure are fabricated to serve as robust electrocatalysts for acidic methanol oxidation reaction (MOR). Surpassing Rh-free PtCoNi NWs and most of state-of-the-art catalysts, the PtCoNiRh NWs achieve extremely high MOR activity (1.36 A.mg(Pt)(-1) and 2.08 mA cm(-2)) with substantially lowered onset-potential and improved CO-tolerance. The anticorrosion effect of incorporated-Rh can effectively stabilize the PtCoNiRh NWs in the corrosive MOR. Electrochemical in situ Fourier transform infrared spectroscopy and density functional theory simulation cooperatively reveal that the methanol dehydrogenation is inclined to occur at the interatomic Pt-Rh sites, where the intermediate COads prefers bridge binding mode rather than linear mode with facilitated removal. Integratedly, the complete 6e(-)-transferred MOR process is reliably accelerated and stays efficient on the quaternary PtCoNiRh NWs.
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