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

Yoshiyuki Kuroda , Hikaru Igarashi , Takaaki Nagai , Teko Napporn (1) , Koichi Matsuzawa , Shigenori Mitsushima (2) , Ken-Ichiro Ota , Akimitsu Ishihara

1 IC2MP [Poitiers] - Institut de chimie des milieux et matériaux de Poitiers [UMR 7285]
2 Yokohama National University, Graduate School of Engineering Science, Institute of Advanced Sciences

Titanium suboxides, such as the Magneli-phase TixO2x-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 Magneli-phase Ti6O11 without residual carbon is demonstrated for the first time by templating method, using a colloidal crystal template. Highly ordered mesoporous Magneli-phase Ti6O11 was obtained by reduction of TiO2 framework within the template under H-2 flow at 800 degrees C, followed by the removal of template with a sodium hydroxide solution. The BET surface area was 11 m(2)/g. The mesoporous Ti6O11 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 Ti6O11 is useful as a carbon-free electrochemical support material for various applications.

Mots clés: Mesoporous materials; Magneli-phase titanium suboxides; Coaxial arc plasma deposition; Catalyst supports; Oxygen reduction reaction

Domaines: Chimie

Yoshiyuki Kuroda, Hikaru Igarashi, Takaaki Nagai, Teko Napporn, Koichi Matsuzawa, et al.. Templated Synthesis of Carbon-Free Mesoporous Magnéli-Phase Titanium Suboxide. Electrocatalysis, 2019, 10 (5), pp.459-465. ⟨10.1007/s12678-019-00544-3⟩. ⟨hal-02319988⟩