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Active and stable platinum/ionic liquid/carbon nanotube electrocatalysts for oxidation of methanol

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      Platinum (Pt) nanoparticles (NPs) on carbon nanotubes (CNTs) from PtCl 6 2− ions through a facile ionic liquid (IL)-assisted method has been developed and used for methanol oxidation. 1-Butyl-3-methylimidazolium (BMIM) with four different counter ions (PF 6 , Cl , Br , and I ) have been tested for the preparation of Pt/IL/CNT nanohybrids, showing the counterions of ILs play an important role in the formation of small sizes of Pt NPs. Only [BMIM][PF 6] and [BMIM][Cl] allow reproducible preparation of Pt/IL/CNT nanohybrids. The electroactive surface areas of Pt/[BMIM][PF 6]/CNT, Pt/[BMIM][Cl]/CNT, Pt/CNT, and commercial Pt/C electrodes are 62.8, 101.5, 78.3, and 87.4 m 2 g −1, respectively. The Pt/[BMIM][Cl]/CNT nanohybrid-modified electrodes provide higher catalytic activity (251.0 A g −1) at a negative onset potential of −0.60 V than commercial Pt/C-modified ones do (133.5 A g −1) at −0.46 V. The Pt/[BMIM][Cl]/CNT electrode provides the highest ratio (4.52) of forward/reverse oxidation current peak, revealing a little accumulation of carbonaceous residues.

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      Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects. Some of these applications are now realized in products. Others are demonstrated in early to advanced devices, and one, hydrogen storage, is clouded by controversy. Nanotube cost, polydispersity in nanotube type, and limitations in processing and assembly methods are important barriers for some applications of single-walled nanotubes.
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            Author and article information

            [1 ]Department of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 106, Taiwan
            Author notes
            [* ]Corresponding author's e-mail address: changht@
            (View ORCID Profile)
            ScienceOpen Research
            9 October 2014
            : 0 (ID: 5d304b97-4244-4235-8cf7-546b348dd9fd )
            : 0
            : 1-8
            1927:XE 10.14293/S2199-1006.1.SORCHEM.AYZQJS.v1
            © 2014 G-L. Lin et al.

            This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at .

            Figures: 4, Tables: 0, References: 54, Pages: 8
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