Improvements of electrocatalytic activity of PtRu nanoparticles on multi-walled carbon nanotubes by a H2 plasma treatment in methanol and formic acid oxidation |
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| Authors: | Zhongqing Jiang Zhong-jie Jiang |
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| Affiliation: | aDepartment of Chemical Engineering, Ningbo University of Technology, Ningbo 315016, Zhejiang, China;bDepartment of Nature and Sciences, University of California, Merced 95348, USA |
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| Abstract: | A H2 plasma has been used to treat the PtRu nanoparticles supported on the plasma functionalized multi-walled carbon nanotubes (PtRu/PS-MWCNTs). The plasma treatment does not change the size and crystalline structure of PtRu nanoparticles, but reduces the fraction of the oxidized species at the outermost perimeter of particles. The electrochemical results show that these plasma treated PtRu/PS-MWCNTs exhibit increased electrochemically active surface area, improved electrocatalytic activity and long term stability toward methanol and formic acid oxidation, and enhanced tolerance to carbonaceous species relative to the sample untreated with the H2 plasma. The electrocatalytic activities of the plasma treated PtRu/PS-MWCNTs are found to be dependent upon the Pt:Ru atomic ratios of PtRu nanoparticles. The catalysts with a Pt:Ru atomic ratio close to 1:1 show superior properties in the electrooxidation of methanol and formic acid at room temperature and better tolerance to carbonaceous species. |
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| Keywords: | PtRu nanoparticles Multi-walled carbon nanotubes Plasma treatment Electrocatalysts Direct methanol fuel cells Direct formic acid fuel cells |
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