MoC–graphite composite as a Pt electrocatalyst support for highly active methanol oxidation and oxygen reduction reaction

Molybdenum carbide (MoC or Mo sub(2)C) nanoparticles down to 2 nm in size on carbon (C-Mo sub(x)C) are synthesized through an ion exchange process, and used as a Pt electrocatalyst support for both the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). XRD, Raman spectrometer, TE...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2014-01, Vol.2 (11), p.4014-4022
Main Authors: Yan, Zaoxue, He, Guoqiang, Shen, Pei Kang, Luo, Zhibin, Xie, Jimin, Chen, Min
Format: Article
Language:English
Subjects:
Binding energy
Carbon
Electrocatalysts
Methyl alcohol
Oxidation
Platinum
Reduction
Synergistic effect
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Molybdenum carbide (MoC or Mo sub(2)C) nanoparticles down to 2 nm in size on carbon (C-Mo sub(x)C) are synthesized through an ion exchange process, and used as a Pt electrocatalyst support for both the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). XRD, Raman spectrometer, TEM and XPS measurements are used to characterize the structure and properties of the synthesized materials. The results show that the typical Pt/C-MoC exhibits 160 mV negative shift in onset potential for the MOR, and 2.3 times kinetic mass current (276.7 mA mg sub(Pt) super(-1)) for the ORR compared to commercial Pt/C-TKK. The large improvement in the catalytic activity resulted from the synergistic effect and binding effect between Pt and MoC. The results also show that MoC promotes both the activity and stability of the Pt electrocatalyst to a greater extent than Mo sub(2)C, owing to the different synergistic effect and binding energy. In addition, the Mo compound was found to have an obvious catalytic effect on the graphitization of the carbon source, and the graphited carbon was supposed to give more stability as an electrocatalyst support.
ISSN:2050-7488
2050-7496
DOI:10.1039/c3ta14251e