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High-activity mesoporous Pt/Ru catalysts for methanol oxidation.
Esteban A Franceschini1, Mariano M Bruno, Federico J Williams
1Grupo de Celdas de Combustible, Departamento de Física de la Materia Condensada, Centro Atómico Constituyentes, CNEA . 1650, Buenos Aires, Argentina .
ACS Applied Materials & Interfaces
|October 3, 2013
Summary
Highly active mesoporous platinum-ruthenium (Pt/Ru) catalysts were synthesized for methanol oxidation. Larger pore sizes (10 nm) significantly enhanced catalytic activity and CO2 conversion efficiency due to improved methanol accessibility.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Methanol oxidation reaction (MOR) is crucial for fuel cells.
- Nanoparticulated platinum-ruthenium (Pt/Ru) catalysts are commonly used but have limitations.
- Developing highly active and efficient catalysts is essential for practical applications.
Purpose of the Study:
- To synthesize high-activity mesoporous Pt/Ru catalysts with a 2D-hexagonal structure.
- To investigate the effect of pore size on the catalytic performance for MOR.
- To understand the relationship between catalyst structure and activity.
Main Methods:
- Synthesis of mesoporous Pt/Ru catalysts using a triblock copolymer (Pluronic F127) template.
- Characterization of catalyst structure and pore size.
- Electrochemical evaluation of catalytic activity for MOR, including kinetic parameter analysis.
Main Results:
- Mesoporous Pt/Ru catalysts exhibited higher normalized mass activities for MOR compared to nanoparticulated counterparts.
- Catalyst performance was strongly dependent on pore size, with larger pores (10 nm) showing superior activity.
- Increased pore size led to greater methanol accessibility and higher CO2 conversion efficiency.
Conclusions:
- Mesoporous Pt/Ru catalysts with controlled pore sizes offer enhanced performance for methanol oxidation.
- Optimizing pore size is critical for maximizing catalyst activity and efficiency.
- The findings provide insights into designing advanced catalysts for electrochemical applications.
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