We have succeeded
to synthesize gallium oxide consisting of α-phase
(α-Ga2O3) with the calcination of GaOOH
obtained by a direct reaction of liquid Ga metal with water for the
first time and found that α-Ga2O3 exhibits
photocatalytic activity for CO2 reduction with water and
water splitting as well. The calcination above 623 K converted GaOOH
to α-Ga2O3, and the samples calcined at
723–823 K were well crystallized to α-Ga2O3 and promoted photocatalytic CO2 reduction with
water, producing CO, H2, and O2. This is observed
for the first time that α-Ga2O3 without
a cocatalyst has shown very high photocatalytic activity for the conversion
of CO2 to CO.
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