A novel CO-tolerant PtRu core–shell structured electrocatalyst with Ru rich in core and Pt rich in shell for hydrogen oxidation reaction and its implication in proton exchange membrane fuel cell
| Autor: | Gianluigi A. Botton, K. J. Dudeck, Ru-Shi Liu, Feihong Nan, Hao Ming Chen, Jiujun Zhang, Lei Zhang, Jenny Kim |
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| Rok vydání: | 2011 |
| Předmět: |
Absorption spectroscopy
Extended X-ray absorption fine structure Renewable Energy Sustainability and the Environment Chemistry Inorganic chemistry Energy Engineering and Power Technology Proton exchange membrane fuel cell Crystal structure Electrocatalyst proton exchange membrane fuel cell Catalysis Transmission electron microscopy CO-tolerance electrocatalyst Electrical and Electronic Engineering Physical and Theoretical Chemistry Absorption (chemistry) hydrogen oxidation reaction (HOR) |
| Zdroj: | Journal of Power Sources. 196:9117-9123 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2011.05.020 |
| Popis: | A novel PtRu catalyst consisting of a Ru-rich core and a Pt-rich shell was synthesized using a two-step microwave irradiation technique. The synthesized PtRu/C catalysts were characterized by X-ray diffraction (XRD), extended X-ray absorption finestructure (EXAFS), transmission electron microscopy (TEM) as well as energy dispersive X-ray spectrometry (EDXS). The produced PtRu/C catalysts showed identical crystalline structure and diffraction peaks to Pt itself, but with negligible higher 2 shift degrees, indicating the formation of a specific composite structure rather than alloy formation. This novel structure of PtRu/C catalyst was also further verified via X-ray absorption spectroscopy. The particle size of PtRu catalysts identified by TEM was less than 5 nm. In order to investigate the CO tolerance in the hydrogen oxidation reaction (HOR), H2 streams with six different concentrations of CO (0, 10, 50, 100, 300, and 500 ppm) were used. The electrocatalytic activity thus obtained was not only better than that of Pt/C catalyst in HOR, but also showed a better CO tolerance in various CO concentrations. |
| Databáze: | OpenAIRE |
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