Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119393
Keywords
Electrocatalytic methanol oxidation; Platinum-metal oxide composite catalyst; Reaction mechanism identification; Spectroelectrochemistry; DFT calculations
Funding
- NSFC of MOST [21733004]
- International Cooperation Program of STCSM [17520711200]
- National Basic Research Program of China (973 Program) [2015CB932303]
- EPSRC [EP/I013229/1]
- Royal Society
- Newton Fund [NAFR1191294]
- Shanghai Sailing Program [20YF1420500]
- EPSRC [EP/I013229/1] Funding Source: UKRI
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The study employs Pt-SnO2 nanoflakes as a catalyst, where the electronic structure manipulation favors the selective enhancement of the non-CO pathway for electrochemical methanol oxidation reaction.
Pt-metal oxide nanocomposites are classified as an alternative promising catalyst besides Pt-Ru nanoalloys for electrochemical methanol oxidation reaction (MOR), and yet the relevant enhancement mechanism for MOR remains largely elusive in terms of catalyst functions and reaction pathways. Herein, interface-rich Pt-SnO2 nanoflakes supported on reduced graphene oxide have been prepared and employed as a model catalyst for such a study. X-ray photoelectron spectroscopy and X-ray absorption spectroscopy measurements reveal significant electronic structure modification on Pt in contact with SnO2, concomitant with enhanced MOR. In-situ surface enhanced infrared absorption spectroscopy and on-line differential electrochemical mass spectrometry measurements indicate that the non-CO pathway is selectively enhanced on Pt-SnO2 compared to the CO pathway which prevails on Pt. DFT calculations reinforce that this electronic structure manipulation favors the non-CO reaction pathway on Pt-SnO2.
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