Mixed phases of GaOOH/β-Ga₂O₃ and α-Ga₂O₃/β-Ga₂O₃ prepared by high energy ball milling as active photocatalysts for CO₂ reduction with water

Abstract

Photocatalytic activity of mixed phases of GaOOH/β-Ga2O3 and α-Ga2O3/β-Ga2O3 for CO2 reduction with water is investigated first time. GaOOH/β-Ga2O3 is synthesized with high energy ball milling of β-Ga2O3 in water,...

Surface gallium oxide hydroxide species adsorbing carbon dioxide to enhance the photocatalytic activity of silver-loaded calcium titanate for carbon dioxide reduction with water

“…A study mentioned that the loading of GaOOH on the Ga 2 O 3 photocatalyst can increase the specific surface area for adsorbing more CO 2 for the enhancement of CO evolution. 11 However, in the present case, only 1.0 wt% GaOOH cannot greatly increase the specific surface area of the bare CTO (Table S2†). Hence, it is suggested that the CO 2 adsorption properties of the surface GaOOH layer can enhance the probability of CO 2 reduction by the aid of the Ag cocatalyst.…”

“…8 A Cu/g-C 3 N 4 composite material can increase the yield of CO by adsorbing CO 2 on the g-C 3 N 4 surface and then being utilized by the supported Cu cocatalyst. 9 A composite of GaOOH and Ga 2 O 3 has been reported for the enhancement of the adsorption and the photocatalytic activity for CO 2 reduction, 10,11 where it has been proved that GaOOH has a certain ability to adsorb CO 2 for the improvement of CO evolution. Therefore, the development of a CO 2 adsorbent that is deposited on the photocatalyst surface might be a promising strategy.…”

Synthesis of meso-porous α-Ga2O3 from liquid Ga metal having significantly high photocatalytic activity for CO2 reduction with water

“…As for the reaction mechanism, we have proposed the following redox like chemical reaction. 19 Initially the surface of α-Ga 2 O 3 is hydroxidized with water to be GaOOH. Then UV light illumination dissociated the GaOOH as 2GaOOH → α-Ga 2 O 3 + H 2 + 1/2O 2 …”