Effects of electrolytes on the photoelectrochemical reduction of carbon dioxide at illuminated p-type cadmium telluride and p-type indium phosphide electrodes in aqueous solutions

Photoelectrochemical reduction of carbon dioxide on illuminated p-type CdTe and p-type InP electrodes were studied in aqueous solutions containing a variety of supporting electrolytes such as carbonates, sulfates, phosphates, and perchlorates of alkali salts, and tetraalkylammonium salts

Hiroshi Yoneyama

2002

Scholarcy highlights

  • Photoelectrochemical reduction of carbon dioxide on illuminated p-type CdTe and p-type InP electrodes were studied in aqueous solutions containing a variety of supporting electrolytes such as carbonates, sulfates, phosphates, and perchlorates of alkali salts, and tetraalkylammonium salts
  • The electrodes were corroded a little, but reliable results were obtained at both electrodes that the carbonates favored formic acid production, while the other electrolytes favored carbon monoxide production
  • The highest current efficiency, more than 80%, was achieved for carbon dioxide reduction at the p-type CdTe electrode in the presence of tetraallcylammonium salts
  • It is concluded that the difference in hydrophobicity or hydrophilicity of the electrode surfaces between the two kinds of semiconductors results in the difference in reducibility of carbon dioxide as observed

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