Core-shell TiO 2/C nanofibers as supports for electrocatalytic and synergistic photoelectrocatalytic oxidation of methanol

Wei Li, Yang Bai, Fujun Li, Chang Liu, Kwong Yu Chan*, Xin Feng, Xiaohua Lu

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Carbon-coated TiO 2 fibers were synthesized as core-shell structured supports for highly dispersed Pt nanoparticles. The catalyst samples were characterized by XRD, Raman, TGA, SEM, TEM and EDX. Performance of methanol oxidation was evaluated in aqueous H 2SO 4 solutions with methanol by cyclic voltammetry and chronoamperometry. The TiO 2 nanofibers were coated with carbon shells mostly between 5 and 10 nm in thickness. Platinum nanoparticles around 2 nm were evenly deposited onto the as-synthesized carbon-coated TiO 2 fibers, denoted as Pt-TiO 2/C. Electrochemical experiments showed that the peak current density of methanol oxidation in the forward scan was significantly increased by 7.3 and 2.5 times on Pt-TiO 2/C compared with those of Pt-TiO 2 and Pt-C (Vulcan XC-72), respectively. Furthermore, the Pt-TiO 2/C electro-catalyst exhibited a lower onset potential and slower current decay than Pt-C, suggesting higher catalytic activity and better stability. In photo-electrochemical experiments, the electro-catalytic and photo-catalytic properties of Pt-TiO 2/C have been synergistically coupled to boost the performance of methanol oxidation. Under UV irradiation, the total peak current density of methanol oxidation on Pt-TiO 2/C is enhanced 2.5 times as that in the dark. In brief, the cooperation between Pt, carbon shell and TiO 2 support promotes methanol oxidation on Pt-TiO 2/C with and without UV illumination.

Original languageEnglish
Pages (from-to)4025-4031
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number9
DOIs
Publication statusPublished - 7 Mar 2012

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