Synthesis of highly active SnO2-CNTs supported Pt-on-Au composite catalysts through site-selective electrodeposition for HCOOH electrooxidation
| Autor: | Zhang Lei, Wang Liu-cheng, Song Cheng-ying, Guo Xun, Zhao Jian-hong, Wang Jianshe, Xi Jingyu, Zhang Jiujun |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
X ray diffraction General Chemical Engineering Composite number Inorganic chemistry Nanoparticle Morphology and composition Formic acid High resolution transmission electron microscopy Carbon nanotube Electrochemistry Redox Catalysis law.invention law Site selective Electrochemical measurements High-resolution transmission electron microscopy Gold deposits Platinum Thermal transformations Glassy carbon electrodes Tin Synthesis (chemical) High performance composites Excitons Glass membrane electrodes |
| Popis: | In this paper, site-selective electrodeposition method is developed to prepare Pt-on-Au composite catalysts for HCOOH electrooxidation. In the synthesis, Au nanoparticles are prepared through reduction of NaAuCl 4 by Sn(OH) 2 supported on carbon nanotubes and after thermal transformation of Sn(OH) 2 to SnO 2 , composite supports (Au/SnO 2 -CNTs) were obtained. By adjusting the potential of Au/SnO 2 -CNTs coated glassy carbon electrode, Pt entities are selectively deposited on Au particles to form SnO 2 -CNTs supported Pt-on-Au composite catalysts. The morphology and composition of the formed composite catalysts are characterized by instrument techniques such as X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The site-selectivity of Pt electrodeposition on Au is confirmed by electrochemical measurements. The composite catalysts are tested to have high Pt mass activity toward HCOOH oxidation reaction, demonstrating that the synthesis method developed in this paper has promising potential for developing high performance composite catalysts. The Pt content effect on the catalytic activity is also tested for catalyst performance optimization. |
| Databáze: | OpenAIRE |
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