期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 321, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.122027
关键词
Selectivity; CO; ORR; Gallium oxide; Ag
In this work, the performances of Ag-loaded Ga2O3 materials were examined for the photocatalytic conversion of CO2 by H2O. It was found that Ag-loaded fl-Ga2O3 exhibited high selectivity for CO evolution.
In this work, the performances of Ag-loaded commercial Ga2O3 (composite of alpha-and fl-Ga2O3), pure alpha-, and fl-Ga2O3 were examined for the photocatalytic conversion of CO2 by H2O. Ag-loaded fl-Ga2O3 exhibited high selectivity for CO evolution if the proper loading methods and Ag nanoparticle contents were controlled. Using the chemical reduction method with NaH2PO2, 2 wt% Ag nanoparticles on fl-Ga2O3 produced CO with an activity of 201.3 mu mol h-1 and selectivity of 83.5%. However, 8 wt% Ag nanoparticles were required to achieve the same selectivity when prepared using the photodeposition method. By varying the amount of Ag-loaded fl-Ga2O3 for the reaction, it was found that the selectivity toward CO evolution was largely dependent on the amounts of Ag-loaded fl-Ga2O3. The active sites where H2 molecules are formed are poisoned by the oxygen reduction reaction (ORR) at high amounts of Ag-loaded fl-Ga2O3, resulting in a high selectivity for CO evolution.
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