Ordered Mesoporous Carbon Applied Direct Methanol Fuel Cell Anode Catalysts
Date Issued
2007
Date
2007
Author(s)
Lin, Meng-Liang
DOI
en-US
Abstract
Well-ordered mesoporous carbon thin film with short nanochannels is synthesized and applied to direct methanol fuel cell as the anode PtRu alloy catalyst support. The enhancement of the electrooxidation of methanol is attributed to the increase of active sites and the catalyst utilization efficiency. The mass-transport effect on the diffusion of fuel molecules to the active metal sites is effectively minimized by the unique thin film morphology of the mesoporous carbon. Furthermore, a facile and environmental friendly method for surface modification of mesoporous carbon by ozone treatment is achieved. Presumably, the modification process may affect the nucleation and dispersion of the PtRu nanoparticles which then to deposit onto carbon surface. The bimetallic PtRu alloy with 70% Pt and 30% Ru surface atom ensemble is discovered to be the most favorable composition toward the kinetics of methanol electrooxidation. We also propose a structure model of carbon-supported PtRu nanoparticles through the results of X-ray photoelectron spectroscopy and X-ray absorption spectroscopy analyses. In addition, a non-metallic element, phosphorus, is added into PtRu alloy to reduce the particle size. The carbon-supported PtRuP nanocatalyst with particle size ~3.0 nm is found to possess both better reactivity and stability.
Subjects
中孔洞碳材
直接甲醇燃料電池
鉑釕合金觸媒
表面修飾
臭氧
X光光電子能譜
X光吸收光譜
Ordered Mesoporous Carbon
Direct Methanol Fuel Cell
PtRu Alloy Catalyst
Surface Treatment
Ozone
X-ray Photoelectron Spectroscopy
X-ray Absorption Spectroscopy
Type
thesis
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