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Complexed sol-gel synthesis of improved Pt-Ru-Os-based anode electro-catalysts for direct methanol fuel cells |
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| Authors: | Yousef M. Alyousef S.C. Yao |
| Affiliation: | a Energy Research Institute, King Abdulaziz City for Science and Technology, Riyadh 11442, Saudi Arabia b Mechanical Engineering and Materials Science, Swanson School of Engineering, University of Pittsburgh, PA 15261, USA c Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA d Bioengineering, Chemical and Petroleum Engineering, Swanson School of Engineering, University of Pittsburgh, PA 15261, USA |
| Abstract: | A high specific surface area (SSA) Pt-Ru-Os-based anode catalyst synthesized by a novel complexed sol-gel (CSG) process shows better catalytic activity in comparison to pure equi-atomic compositions of Pt-Ru anode catalysts synthesized by similar sol-gel processes. A homogeneous amorphous gel was successfully synthesized by complexing platinum(II) acetylacetonate, ruthenium(III) acetylacetonate and osmium(III) chloride with tetramethylammonium hydroxide (TMAH) used as a complexing agent. Phase-pure Pt(Ru,Os) and Pt(Ru) solid solutions possessing high specific surface area (∼110-120 m2/g) were successfully synthesized by controlled removal of carbonaceous species present in the as-prepared precursor generated from the CSG process. This has been successfully achieved by precise thermal treatments of the precursor using controlled oxidizing atmospheres. Results indicate that the nano-crystalline Pt(Ru,Os) solid solution of nominal composition 50 at%-Pt-40 at% Ru-10 at% Os possesses good chemical homogeneity, and reveals excellent catalytic activity, thus demonstrating the potential of the novel CSG process for synthesizing high-performance Pt-Ru-Os-based catalysts for direct methanol fuel cells. |
| Keywords: | A. Alloys A. Nanostructures B. Chemical synthesis D. Electrochemical properties |
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