Templated Synthesis of Carbon-Free Mesoporous Magnéli-Phase Titanium Suboxide

Titanium suboxides, such as the Magnéli-phase Ti x O 2 x –1 , have attracted much attention as candidates of stable electrode materials because of their high conductivity and stability. The synthesis of porous titanium suboxides with high surface area without the formation of residual carbon is impo...

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Bibliographic Details
Published in:Electrocatalysis 2019-09, Vol.10 (5), p.459-465
Main Authors: Kuroda, Yoshiyuki, Igarashi, Hikaru, Nagai, Takaaki, Napporn, Teko W., Matsuzawa, Koichi, Mitsushima, Shigenori, Ota, Ken-ichiro, Ishihara, Akimitsu
Format: Article
Language:English
Subjects:
Arc deposition
Carbon
Catalysis
Catalytic activity
Chemical Sciences
Chemistry
Chemistry and Materials Science
Electrochemistry
Electrode materials
Electrodes
Energy Systems
Letters
Nanoparticles
Oxygen reduction reactions
Physical Chemistry
Plasma deposition
Sodium hydroxide
Surface area
Synthesis
Titanium
Titanium dioxide
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Summary:Titanium suboxides, such as the Magnéli-phase Ti x O 2 x –1 , have attracted much attention as candidates of stable electrode materials because of their high conductivity and stability. The synthesis of porous titanium suboxides with high surface area without the formation of residual carbon is important to achieve active and stable electrode materials. Here, the synthesis of mesoporous Magnéli-phase Ti 6 O 11 without residual carbon is demonstrated for the first time by templating method, using a colloidal crystal template. Highly ordered mesoporous Magnéli-phase Ti 6 O 11 was obtained by reduction of TiO 2 framework within the template under H 2 flow at 800 °C, followed by the removal of template with a sodium hydroxide solution. The BET surface area was 11 m 2 /g. The mesoporous Ti 6 O 11 loaded with Pt nanoparticles deposited by the coaxial arc plasma deposition showed oxygen reduction reaction activity comparable to those of commercial Pt/C, though oxide support often reduces catalytic activity of supported Pt nanoparticles. Consequently, the mesoporous Ti 6 O 11 is useful as a carbon-free electrochemical support material for various applications. Graphical Abstract Highly ordered carbon-free mesoporous Magnéli-phase titanium suboxide was successfully synthesized by the templating method, and it was useful as an electrochemical support for Pt nanoparticles deposited by the arc plasma deposition for oxygen reduction reaction.
ISSN:1868-2529
1868-5994
DOI:10.1007/s12678-019-00544-3