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

Fingerprint

Nanofibers
Methanol
Oxidation
Carbon
Current density
Nanoparticles
Chronoamperometry
Catalysts
Fibers
Platinum
Catalyst supports
Cyclic voltammetry
Energy dispersive spectroscopy
Catalyst activity
Lighting
Experiments
Irradiation
Transmission electron microscopy
Scanning electron microscopy

Cite this

Li, Wei ; Bai, Yang ; Li, Fujun ; Liu, Chang ; Chan, Kwong Yu ; Feng, Xin ; Lu, Xiaohua. / Core-shell TiO 2/C nanofibers as supports for electrocatalytic and synergistic photoelectrocatalytic oxidation of methanol. In: Journal of Materials Chemistry. 2012 ; Vol. 22, No. 9. pp. 4025-4031.
@article{81937ddc44a249a3ac4200d267e2247a,
title = "Core-shell TiO 2/C nanofibers as supports for electrocatalytic and synergistic photoelectrocatalytic oxidation of methanol",
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.",
author = "Wei Li and Yang Bai and Fujun Li and Chang Liu and Chan, {Kwong Yu} and Xin Feng and Xiaohua Lu",
year = "2012",
month = "3",
day = "7",
doi = "10.1039/c2jm14847a",
language = "English",
volume = "22",
pages = "4025--4031",
journal = "Journal of Materials Chemistry",
issn = "0959-9428",
publisher = "Royal Society of Chemistry",
number = "9",

}

Core-shell TiO 2/C nanofibers as supports for electrocatalytic and synergistic photoelectrocatalytic oxidation of methanol. / Li, Wei; Bai, Yang; Li, Fujun; Liu, Chang; Chan, Kwong Yu; Feng, Xin; Lu, Xiaohua.

In: Journal of Materials Chemistry, Vol. 22, No. 9, 07.03.2012, p. 4025-4031.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Core-shell TiO 2/C nanofibers as supports for electrocatalytic and synergistic photoelectrocatalytic oxidation of methanol

AU - Li, Wei

AU - Bai, Yang

AU - Li, Fujun

AU - Liu, Chang

AU - Chan, Kwong Yu

AU - Feng, Xin

AU - Lu, Xiaohua

PY - 2012/3/7

Y1 - 2012/3/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84863121153&partnerID=8YFLogxK

UR - https://pubs.rsc.org/en/content/articlelanding/2012/JM/c2jm14847a#!divAbstract

U2 - 10.1039/c2jm14847a

DO - 10.1039/c2jm14847a

M3 - Article

AN - SCOPUS:84863121153

VL - 22

SP - 4025

EP - 4031

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

SN - 0959-9428

IS - 9

ER -