High-Activity Mesoporous Pt/Ru Catalysts for Methanol Oxidation

被引：73
作者：
Franceschini, Esteban A. [1 ]
Bruno, Mariano M. [1 ,2 ]
Williams, Federico J. [3 ]
Viva, Federico A. [1 ]
Corti, Horacio R. [1 ,3 ]
机构：
[1] CNEA, Ctr Atom Constituyentes, Dept Fis Mat Condensada, Grp Celdas Combustible, RA-1650 Buenos Aires, DF, Argentina
[2] Univ Gral San Martin, Escuela Ciencia & Tecnol, RA-1650 Buenos Aires, DF, Argentina
[3] Univ Buenos Aires, Fac Ciencias Exactas & Nat, INQUIMAE CONICET, Dept Quim Inorgan Analit & Quim Fis, Buenos Aires, DF, Argentina
来源：
ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 21期
关键词：
fuel cells; methanol; Pt/Ru catalysts; mesoporous; mass activity; PluronicF127; PEM FUEL-CELLS; PTRU NANOPARTICLES; NICKEL NITRATE; OXYGEN ELECTROREDUCTION; NANOSTRUCTURED PLATINUM; DIFFUSION-COEFFICIENT; CARBON NANOTUBES; SILICA SBA-15; ELECTROOXIDATION; RU;
D O I：
10.1021/am403471c
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High activity mesoporous Pt/Ru catalysts with 2D-hexagonal structure were synthesized using a triblock poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) copolymer (Pluronic F127) template. The normalized mass activities for the methanol oxidation reaction (MOR) of the Pt/Ru catalysts with a regular array of pores is higher than those reported for nanoparticulated Pt/Ru catalysts. Different kinetic parameters, as Tafel slope and activation energy, were obtained for the MOR on the mesoporous catalysts. Results indicated that catalysts performance depends on pore size. Mass activities and the CO2 conversion efficiency for large pore size mesoporous catalysts (10 nm) are greater than those reported for smaller pore size mesoporous catalysts with similar composition. The effect of pore size on catalysts performance is related to the greater accessibility of methanol to the active areas inside large pores. Consequently, the overall residence time of methanol increases as compared with mesoporous catalyst with small pores.
引用
收藏
页码：10437 / 10444
页数：8
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