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Carbothermal synthesis of titanium oxycarbide as electrocatalyst support with high oxygen evolution reaction activity

Published online by Cambridge University Press:  09 November 2012

Kan Huang ,
Yunfeng Li  and
Yangchuan Xing
Kan Huang
Affiliation:
Department of Chemical and Biological Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409
Yunfeng Li
Affiliation:
Department of Chemical and Biological Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409
Yangchuan Xing*
Affiliation:
Department of Chemical Engineering, University of Missouri, Columbia, Missouri 65211
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Carbothermal reduction of semiconducting TiO2 into highly conductive titanium oxycarbide (TiOxCy) was investigated. The thermally produced uniform carbon layer on TiO2 (Degussa P25) protects the TiO2 nanoparticles from sintering and, at the same time, supplies the carbon source for doping TiO2 with carbon. At low temperatures (e.g., 700 °C), carbon only substitutes part of the oxide and distorts the TiO2 lattice to form TiO2−xCx with only substitutional carbon. When the carbon-doped TiO2 is annealed at a higher temperature (1100 °C), x-ray diffraction and x-ray photoelectron spectroscopy results showed that TiOxCy, a solid solution of TiO and TiC, was formed, which displays different diffraction peaks and binding energies. It was shown that TiOxCy has much better oxygen revolution reaction activity than TiO2 or TiO2−xCx. Further studies showed that the TiOxCyobtained can be used as a support for metal electrocatalyst, leading to a bifunctional catalyst effective for both oxygen reduction and evolution reactions.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 454 - 460
Copyright
Copyright © Materials Research Society 2012

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