PtRu nanoparticles supported on nitrogen-doped multiwalled carbon nanotubes as catalyst for methanol electrooxidation |
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Authors: | Raghuram Chetty Shankhamala Kundu Michael Bron Wolfgang Schuhmann Valentin Chirila Thomas Reinecke |
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Affiliation: | a Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany b Analytische Chemie - Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany c Institut für Geologie, Mineralogie and Geophysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany d Material Science and Testing, University of Applied Sciences, Gelsenkirchen, Germany |
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Abstract: | Nitrogen-doped carbon nanotubes (N-CNT) obtained by plasma treatment were compared to the conventional acid-treated carbon nanotubes (O-CNT) as catalyst support for platinum-ruthenium (PtRu) nanoparticles in the anodic oxidation of methanol in direct methanol fuel cells. PtRu catalysts were prepared by an impregnation-reduction method from chloride precursors with metal loadings of 20 wt.%, and were characterised by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical methods. Voltammetry and chronoamperometry studies showed that the performance of PtRu/N-CNT was significantly higher compared to PtRu/O-CNT and also to the commercial E-TEK PtRu/C catalyst, indicating that N-CNT are an interesting support material for fuel cell electrocatalyst. Nitrogen plasma treatment produced pyridinic and pyrrollic species on the CNT surface, which acts as the anchoring sites for the deposition of PtRu particles. A mechanism for the deposition of PtRu on N-CNT is tentatively proposed and discussed. |
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Keywords: | Carbon nanotubes Plasma functionalization Nitrogen-doping PtRu catalyst DMFC |
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