Pyrochlore-type Bi<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub> oxide as an electrocatalyst for carbon dioxide reduction

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  • MORI Atsuki
    Department of Applied Chemistry, Kyushu Institute of Technology
  • KAWAMURA Misato
    Department of Applied Chemistry, Kyushu Institute of Technology
  • TAKASE Satoko
    Department of Applied Chemistry, Kyushu Institute of Technology
  • SHIMIZU Youichi
    Department of Applied Chemistry, Kyushu Institute of Technology

Abstract

<p>Pyrochlore-type A2B2O7−z (A = Pb, Bi; B = Nb, Ru, Sn, Ir) oxide fine powders were synthesized by a wet-chemical method. The electrochemical reduction properties of carbon dioxide were investigated with carbon-based gas-diffusion-type electrodes loaded with various pyrochlore-type oxide catalysts. The current–voltage curves under pure CO2 gas flow showed that the Sn-based pyrochlore-type oxides gave high electrocatalytic activities for the electrochemical CO2 reduction. Among the pyrochlore-type oxides tested, Bi2Sn2O7 showed the highest CO2 reduction reaction which gave CO as a main product at very high concentration. XPS analyses showed that the high performance for the electrochemical CO2 reduction of Bi2Sn2O7 was come from the valence state of Sn and/or oxygen adsorption–desorption properties of the pyrochlore-type oxide.</p>

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