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Issue 27, 2015
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Magnéli phase Ti8O15 nanowires as conductive carbon-free energy materials to enhance the electrochemical activity of palladium nanoparticles for direct ethanol oxidation

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Abstract

Pure single-crystalline Magnéli phase Ti8O15 nanowires (NWs) have been successfully synthesized via a facile one-step evaporation–deposition synthesis method in a hydrogen atmosphere. The electrical conductivity of a single Ti8O15 nanowire is 2060 S m−1 at 300 K, which is much higher than that of carbon black (∼100 S m−1) and almost as high as that of graphite (∼1000 S m−1) or graphene (∼2000 S m−1). Pd nanoparticles (NPs) loaded on Ti8O15 nanowires are synthesized through a pulsed electrodeposition method. As carbon-free support materials for Pd NPs, the Pd/Ti8O15 NWs show a significantly enhanced activity for the ethanol oxidation reaction and excellent durability compared to the Pd/C catalyst. The peak current density of the Pd/Ti8O15 NWs after 2000 cycles is 2791 mA mgPd−1, with only 18.6% loss, while, on the Pd/C electrode, only a current density of 682 mA mgPd−1 is observed, with a loss of 42.3% of the initial ethanol oxidation reaction activity. The synthetic approach for pure single-crystalline Magnéli phase Ti8O15 nanowires gives the inspiration for the development of conductive carbon-free materials for electrocatalysis in direct alcohol fuel cells (DAFCs).

Graphical abstract: Magnéli phase Ti8O15 nanowires as conductive carbon-free energy materials to enhance the electrochemical activity of palladium nanoparticles for direct ethanol oxidation

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Supplementary files

Article information


Submitted
11 Apr 2015
Accepted
01 Jun 2015
First published
03 Jun 2015

J. Mater. Chem. A, 2015,3, 14416-14423
Article type
Paper
Author version available

Magnéli phase Ti8O15 nanowires as conductive carbon-free energy materials to enhance the electrochemical activity of palladium nanoparticles for direct ethanol oxidation

P. K. Shen, C. He, S. Chang, X. Huang and Z. Tian, J. Mater. Chem. A, 2015, 3, 14416
DOI: 10.1039/C5TA02622A

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