Preparation of Tungsten Ruthenium mixed oxide supported Pt catalysts for CO tolerance in Hydrogen Oxidation Reaction
| Autor: | Guo-Yan Huang, 黃國晏 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 Proton exchange membrane fuel cells (PEMFCs) are expected to have enormous potential for both mobile and stationary applications. Carbon supports are mainly used in electrocatalysts for fuel cells because of good electron conductivity and high surface area that may leads to good dispersion of active Pt particles. However, carbon corrosion under operating conditions of PEMFCs becomes a concern which can cause deterioration in the performance of Pt catalysts. To enhance the durability and the CO tolerance of anodic catalysts, mixed-oxide supports are examined in this study. A simple hydrothermal process is applied to synthesize mixed W-Ru oxide supports and the influences of preparation parameters are examined, including Tungsten oxide phase, Tungsten Ruthenium ratio, and pretreatment temperature, and subsequently the preparation procedure is optimized. Pt loading is prepared by EG method. XRD results show that the prepared 40wt%Pt/W5Ru5-N12-c300 contains Pt particle size of 3-4 nm. CO stripping and hydrogen oxidation reaction (HOR) with 100 and 250 ppm CO are examined. The results indicate that 40Pt/W5Ru5-N12-c300 and 40Pt/W7Ru3-N12-c300 catalysts exhibit improved CO tolerance, intrinsic activity and durability comparing to the other prepared catalysts. The overall performance is comparable with commercial 20Pt10Ru/C catalysts. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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