首页|Using magnesium reduction strategy to produce black Ga2O3 with variable oxygen vacancies for photocatalytic applications
Using magnesium reduction strategy to produce black Ga2O3 with variable oxygen vacancies for photocatalytic applications
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NSTL
Elsevier
? 2022 Elsevier B.V.Gallium Oxide (Ga2O3) exhibits great potential in photocatalysis due to its strong redox capability. Nevertheless, working in the deep ultraviolet region and having a high recombination rate limit its application. Using magnesium powder as the reducing agent, colored Ga2O3 with different oxygen vacancy concentrations was prepared by a high temperature solid state reduction method. It is found that the band gap of Ga2O3 is related to the concentration of oxygen vacancy, which can be controlled by reducing agents. Under 30 min of simulated solar light irradiation, black Ga2O3 displays 86.2% degradation efficiency over Rhodamine B dye, which is about two times more than that for the white Ga2O3. Furthermore, after irradiation by the visible light for 120 min, the photocatalytic degradation efficiency of RhB dye for black Ga2O3 increases to approximately 40.6% (26.3% for white Ga2O3). Enhanced separation efficiency of the photogenerated carriers and local absorption of visible light are the main reasons for improved photocatalytic degradation efficiency. A novel method for studying Ga2O3 and semiconductor oxides is established by the preparation of colored Ga2O3.
Black Ga2O3Magnesium reductionOxygen vacancyPhotocatalytic degradationWide band gap semiconductor
NSTL
Elsevier
