Effect of Reduction Temperature on the Preparation and Characterization of Pt−Ru Nanoparticles on Multiwalled Carbon Nanotubes
Carbon nanotubes (CNT) supported platinum−ruthenium (Pt−Ru) catalysts were prepared by impregnation−reduction using an ethanolic solution of H2PtCl6 and RuCl3. The effect of reduction temperatures on particle size, surface area and their relationship to the electrocatalytic activity for methanol oxi...
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| Veröffentlicht in: | Langmuir 2009-03, Vol.25 (6), p.3853-3860 |
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| creator | Chetty, Raghuram Xia, Wei Kundu, Shankhamala Bron, Michael Reinecke, Thomas Schuhmann, Wolfgang Muhler, Martin |
| description | Carbon nanotubes (CNT) supported platinum−ruthenium (Pt−Ru) catalysts were prepared by impregnation−reduction using an ethanolic solution of H2PtCl6 and RuCl3. The effect of reduction temperatures on particle size, surface area and their relationship to the electrocatalytic activity for methanol oxidation were investigated. Thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD) as well as X-ray photoelectron spectroscopy (XPS) were used for the catalyst characterization. XRD analysis showed that the PtRu/CNT catalysts possibly consist of separate Pt and Ru phases. XPS analysis showed that the catalysts contain hydrous ruthenium oxide in addition to Pt and Ru metal and oxide species. The electrocatalytic activities of the catalysts were investigated in half-cell experiments using cyclic voltammetry, CO stripping voltammetry, chronoamperometry, and impedance spectroscopy. The results showed that the catalyst reduced at a temperature of 350 °C had the largest electrochemical surface area, lowest charge transfer resistance and the highest electrocatalytic activity for methanol oxidation. The superior catalytic activity is discussed based on the presence of appropriate amount of hydrated Ru oxide. |
| doi_str_mv | 10.1021/la804039w |
| format | Article |
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The effect of reduction temperatures on particle size, surface area and their relationship to the electrocatalytic activity for methanol oxidation were investigated. Thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD) as well as X-ray photoelectron spectroscopy (XPS) were used for the catalyst characterization. XRD analysis showed that the PtRu/CNT catalysts possibly consist of separate Pt and Ru phases. XPS analysis showed that the catalysts contain hydrous ruthenium oxide in addition to Pt and Ru metal and oxide species. The electrocatalytic activities of the catalysts were investigated in half-cell experiments using cyclic voltammetry, CO stripping voltammetry, chronoamperometry, and impedance spectroscopy. The results showed that the catalyst reduced at a temperature of 350 °C had the largest electrochemical surface area, lowest charge transfer resistance and the highest electrocatalytic activity for methanol oxidation. The superior catalytic activity is discussed based on the presence of appropriate amount of hydrated Ru oxide.</description><identifier>ISSN: 0743-7463</identifier><identifier>EISSN: 1520-5827</identifier><identifier>DOI: 10.1021/la804039w</identifier><identifier>PMID: 19708258</identifier><identifier>CODEN: LANGD5</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Catalysis ; Chemistry ; Colloidal state and disperse state ; Electrochemistry ; Electrochemistry: Charge Transfer, Electrocatalysis, Kinetics, Bioelectrochemistry ; Exact sciences and technology ; General and physical chemistry ; Kinetics and mechanism of reactions ; Physical and chemical studies. Granulometry. Electrokinetic phenomena ; Surface physical chemistry ; Theory of reactions, general kinetics. Catalysis. 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The effect of reduction temperatures on particle size, surface area and their relationship to the electrocatalytic activity for methanol oxidation were investigated. Thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD) as well as X-ray photoelectron spectroscopy (XPS) were used for the catalyst characterization. XRD analysis showed that the PtRu/CNT catalysts possibly consist of separate Pt and Ru phases. XPS analysis showed that the catalysts contain hydrous ruthenium oxide in addition to Pt and Ru metal and oxide species. The electrocatalytic activities of the catalysts were investigated in half-cell experiments using cyclic voltammetry, CO stripping voltammetry, chronoamperometry, and impedance spectroscopy. The results showed that the catalyst reduced at a temperature of 350 °C had the largest electrochemical surface area, lowest charge transfer resistance and the highest electrocatalytic activity for methanol oxidation. The superior catalytic activity is discussed based on the presence of appropriate amount of hydrated Ru oxide.</description><subject>Catalysis</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Electrochemistry</subject><subject>Electrochemistry: Charge Transfer, Electrocatalysis, Kinetics, Bioelectrochemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Kinetics and mechanism of reactions</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Surface physical chemistry</subject><subject>Theory of reactions, general kinetics. Catalysis. 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Granulometry. Electrokinetic phenomena</topic><topic>Surface physical chemistry</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chetty, Raghuram</creatorcontrib><creatorcontrib>Xia, Wei</creatorcontrib><creatorcontrib>Kundu, Shankhamala</creatorcontrib><creatorcontrib>Bron, Michael</creatorcontrib><creatorcontrib>Reinecke, Thomas</creatorcontrib><creatorcontrib>Schuhmann, Wolfgang</creatorcontrib><creatorcontrib>Muhler, Martin</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chetty, Raghuram</au><au>Xia, Wei</au><au>Kundu, Shankhamala</au><au>Bron, Michael</au><au>Reinecke, Thomas</au><au>Schuhmann, Wolfgang</au><au>Muhler, Martin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Reduction Temperature on the Preparation and Characterization of Pt−Ru Nanoparticles on Multiwalled Carbon Nanotubes</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2009-03-17</date><risdate>2009</risdate><volume>25</volume><issue>6</issue><spage>3853</spage><epage>3860</epage><pages>3853-3860</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>Carbon nanotubes (CNT) supported platinum−ruthenium (Pt−Ru) catalysts were prepared by impregnation−reduction using an ethanolic solution of H2PtCl6 and RuCl3. The effect of reduction temperatures on particle size, surface area and their relationship to the electrocatalytic activity for methanol oxidation were investigated. Thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD) as well as X-ray photoelectron spectroscopy (XPS) were used for the catalyst characterization. XRD analysis showed that the PtRu/CNT catalysts possibly consist of separate Pt and Ru phases. XPS analysis showed that the catalysts contain hydrous ruthenium oxide in addition to Pt and Ru metal and oxide species. The electrocatalytic activities of the catalysts were investigated in half-cell experiments using cyclic voltammetry, CO stripping voltammetry, chronoamperometry, and impedance spectroscopy. The results showed that the catalyst reduced at a temperature of 350 °C had the largest electrochemical surface area, lowest charge transfer resistance and the highest electrocatalytic activity for methanol oxidation. The superior catalytic activity is discussed based on the presence of appropriate amount of hydrated Ru oxide.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>19708258</pmid><doi>10.1021/la804039w</doi><tpages>8</tpages></addata></record> |
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| subjects | Catalysis Chemistry Colloidal state and disperse state Electrochemistry Electrochemistry: Charge Transfer, Electrocatalysis, Kinetics, Bioelectrochemistry Exact sciences and technology General and physical chemistry Kinetics and mechanism of reactions Physical and chemical studies. Granulometry. Electrokinetic phenomena Surface physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | Effect of Reduction Temperature on the Preparation and Characterization of Pt−Ru Nanoparticles on Multiwalled Carbon Nanotubes |
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