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We have succeeded to synthesize gallium oxide consisting of α-phase (α-Ga 2 O 3 ) with the calcination of GaOOH obtained by a direct reaction of liquid Ga metal with water for the first time and found that α-Ga 2 O 3 exhibits photocatalytic activity for CO 2 reduction with water and water splitting as well. The calcination above 623 K converted GaOOH to α-Ga 2 O 3 , and the samples calcined at 723-823 K were well crystallized to α-Ga 2 O 3 and promoted photocatalytic CO 2 reduction with water, producing CO, H 2 , and O 2 . This is observed for the first time that α-Ga 2 O 3 without a cocatalyst has shown very high photocatalytic activity for the conversion of CO 2 o CO.

Synthesis of α-Ga2O3 by Water Oxidation of Metallic Gallium as a Photocatalyst for CO2 Reduction with Water

Synthesis of α-Ga₂O₃ by Water Oxidation of Metallic Gallium as a Photocatalyst for CO₂ Reduction with Water