Open AccessSynthesis of α-Ga2O3 by Water Oxidation of Metallic Gallium as a Photocatalyst for CO2 Reduction with Water
Author(s) -
Kenta Sonoda,
Masato Yamamoto,
T. Tanabe,
Tomoko Yoshida
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c02088
Subject(s) - calcination , photocatalysis , gallium , oxide , metal , materials science , inorganic chemistry , water splitting , photocatalytic water splitting , gallium oxide , catalysis , chemical engineering , chemistry , metallurgy , organic chemistry , engineering
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 to CO.