Electrooxidation of CO and methanol on well-characterized carbon supported PtxSn electrodes. Effect of crystal structure
| Autor: | Irina Borbáth, Ferenc Somodi, Sergio Rojas, Miguel A. Peña, K. Majrik, Sergio Garcia, T. Herranz, András Tompos, María Victoria Martínez-Huerta, José Luis García Fierro |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Absorption spectroscopy Renewable Energy Sustainability and the Environment Inorganic chemistry Intermetallic Energy Engineering and Power Technology Crystal structure Condensed Matter Physics Electrochemistry Catalysis chemistry.chemical_compound Fuel Technology Chemical engineering chemistry Phase (matter) Atomic ratio Methanol |
| Zdroj: | International Journal of Hydrogen Energy. 37:7109-7118 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2011.11.131 |
| Popis: | The role of two intermetallic phases of PtSn, namely Pt 3 Sn (fcc phase) and PtSn (hcp phase) for the electrooxidation of CO and methanol has been evaluated. Carbon supported Pt 3 Sn and PtSn nanosized particles have been prepared by controlled surface reactions. The actual structure of the PtSn alloys has been evaluated and confirmed by means of XRD and HR-TEM studies which reveal the predominance of either the hcp or the fcc phase in each catalyst. The catalysts have been further characterized to identify the actual metal loading and Pt/Sn atomic ratio in order to eliminate particle size or metal loading effects on their electrocatalytic performance. The performance of the catalysts for the electrooxidation of CO and methanol has been evaluated by electrochemical techniques along with in situ techniques such as electrochemical coupled Infrared Reflection Absorption Spectroscopy (EC-IRAS) and differential electrochemical mass spectrometry (DEMS). Altogether, the results presented in this work reveal that Pt 3 Sn fcc is more active than PtSn hcp for the electrooxidation of CO and methanol and that the contribution of the hcp phase in those electrocatalytic processes is negligible. |
| Databáze: | OpenAIRE |
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