Optimum concentration gradient of the electrocatalyst, Nafion (R) and poly(tetrafluoroethylene) in a membrane-electrode-assembly for enhanced performance of direct methanol fuel cells

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A combinatorial library of membrane-electrode-assemblies (MEAs) which consisted of 27 different compositions was fabricated to optimize the multilayer structure of direct methanol fuel cells. Each spot consisted of three layers of ink and a gradient was generated by employing different concentrations of the three components (Pt catalyst, Nafion (R) and polytetrafluoroethylene (PTFE)) of each layer. For quick evaluation of the library, a high-throughput optical screening technique was employed for methanol electro-oxidation reaction (MOR) activity. The screening results revealed that gradient layers could lead to higher MOR activity than uniform layers. It was found that the MOR activity was higher when the concentrations of Pt catalyst and Nafion ionomer decreased downward from the top layer to the bottom layer. On the other hand, higher MOR activity was observed when PTFE concentration increased downward from the top to the bottom layer.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2010-12
Language
English
Article Type
Article
Keywords

OXYGEN REDUCTION; ANODE ELECTROCATALYSTS; COMBINATORIAL APPROACH; CATALYST LAYER; ELECTROOXIDATION; OXIDATION; PLATINUM; TERNARY; SEARCH; ELECTROCHEMISTRY

Citation

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.12, no.46, pp.15259 - 15264

ISSN
1463-9076
URI
http://hdl.handle.net/10203/99625
Appears in Collection
CBE-Journal Papers(저널논문)
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