Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 11, Pages 1646-1649Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.09.017
Keywords
Carbon nanotube; Surface functionalization; Electrocatalyst; Methanol electrooxidation
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Funding
- Academic research fund AcRF tier 2 [MOE2009-T2-2-024]
- Ministry of Education, Singapore [2009 NRF-CRP 001-032]
- National Research Foundation, Singapore
- Agency for Science, Technology and Research (A*Star), Singapore
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Polyelectrolytes with various characteristic functional groups as interlinkers to anchor Pt nanoparticles were used to functionalize carbon nanotubes (CNTs) as Pt electrocatalyst support. It was found that polyanions (poly(styrenesulfonic acid) (PSS), and poly(acrylic acid sodium) (PAA)) have a beneficial effect on methanol electrooxidation on Pt nanoparticles supported on carbon nanotubes via modifying their electronic structure through charge transfer from polyanions to Pt sites and supply of oxygen-containing species. The increased electron density around Pt sites by the charge transfer from polyanions would cause partial filling of Pt 5d-bands, resulting in the downshift of d-band center and weaker chemisorption with oxygen-containing species (e.g. CO(ad)). The weakened chemisorption of CO on Pt nanoparticles would promote the methanol electrooxidation. On the contrary, polycations would have an opposite effect on the electronic structure and chemisorption properties of Pt nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.
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