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• The development of a photoelectrocatalytic reactor for the CO 2 reduction to hydrocarbon fuels. • Development of a new catalytic quaternary CuO-Graphene-ZnFe 2 O 4 -TiO 2 nanocomposite. • The different types of electrolytes in CO 2 ER reaction to support the interaction between the cathode surface and the outcoming final product. • A highest FE in each tests, especially 44.08 % in buffer electrolyte with UV-light. • The pH of the electrolyte and the proton existence impact on the FE (%) values. Research on the electrochemical reduction of CO 2 (CO 2 ER) and photoelectrochemical reduction of CO 2 (PEC-CO 2 R) to produce hydrocarbon fuels using renewable energy sources is gaining significant attention. In this study, we developed a new quaternary-structured catalytic material that has garnered interest in the catalysis industry. The performance of the catalysts was assessed by conducting CO 2 reduction tests using different electrolytes to support the interaction between the cathode surface and the final product. The selectivity and activity of the nanocomposites were evaluated based on the Faradaic efficiency (FE). Among all the tested nanocomposites, the CuO-Graphene-ZnFe 2 O 4 -TiO 2 nanocomposites (CGZFOT NCs) exhibited the highest FE in each test, particularly 44.08 % in the buffer electrolyte with UV light, which facilitated electron transfer for CO 2 reduction to methanol. The second highest FE value of 42.2 % was achieved when NaHCO 3 was used as the electrolyte under UV light. Notably, both the experimental conditions demonstrated high FE values in the absence of a light source. Furthermore, the presence of protons affects FE (%) values. NaHCO 3 , for instance, dissociates into Na+ and HCO 3 –, and acts as a carrier for hydrocarbon ions, enhancing absorption. The buffering capacity of the buffer electrolyte actively reacts with the produced hydroxide, promoting the mass transfer of CO 2 gas. This results in a high current density for redox reactions in sodium hydrocarbonate and a buffer electrolyte for all working electrodes (WEs). The choice of electrolyte significantly affects the performance of the catalyst; thus, we compared catalysts using only one electrolyte to determine whether their activity and selectivity are related to the catalyst structure and properties. The Z-scheme charge carrier mechanism of the quaternary CGZFOT NCs offered efficient separation and carrier of electron-hole pairs, and it was also found that the close-parallel interfacial connection led to improved photoelectrochemical CO 2 reduction (PEC-CO 2 R). In addition, we believe that our experiments provide a complete picture of the performance of catalysts in different environments. [ABSTRACT FROM AUTHOR]

ZLa-BiVO4 photocatalyst was prepared by chemical precipitation method, and its photocatalytic reduction of CO2 in water was examined. The catalyst was characterized by TG-DTA, DRS and XRD technology, and the effect of roasting temperature and other conditions on he activity of photocatalytic reduction of CO2 were studied. The results showed that monoclinic phase La-BiVO4 calcined at 800 °C has the highest activity. When the amount of catalyst was 0. 8 g/L, reaction time was 8 h, CO2 flow was 250 mL/min, the reaction temperature was 70 °C, and he concentration of NaOH and Na2 SO3 were both 0. 10 mol/L, yield of methanol reached 290. 18 mol/g. [ABSTRACT FROM AUTHOR]

ZLa-BiVO4 photocatalyst was prepared by chemical precipitation method, and its photocatalytic reduction of CO2 in water was examined. The catalyst was characterized by TG-DTA, DRS and XRD technology, and the effect of roasting temperature and other conditions on he activity of photocatalytic reduction of CO2 were studied. The results showed that monoclinic phase La-BiVO4 calcined at 800 °C has the highest activity. When the amount of catalyst was 0. 8 g/L, reaction time was 8 h, CO2 flow was 250 mL/min, the reaction temperature was 70 °C, and he concentration of NaOH and Na2 SO3 were both 0. 10 mol/L, yield of methanol reached 290. 18 mol/g. [ABSTRACT FROM AUTHOR]

Exfoliated MoS2 with a 2H phase has unique semiconductor properties and is used for the photocatalytic reduction of CO2 herein. Flower‐like MoS2 nanosheets are synthesized by the hydrothermal method and are used to fabricate an enlarged lamellar structure with a 1T phase of MoS2 in the presence of lithium ions under sonication; the 1T‐to‐2H phase conversion of MoS2 is successfully realized in o‐dichlorobenzene solution. To improve the photocatalytic performance, Ag nanoparticles are combined with the as‐prepared 2H‐MoS2 to form the Schottky knot. The obtained Ag/2H‐MoS2 composites are characterized and evaluated for their compositions, morphologies, microstructures, and photocatalytic activities in the reduction of CO2 to methanol. Herein, it was found that the electron and hole excited by light on the composites are more effectively separated through deposited nano Ag, and their photocatalytic ability of reducing CO2 to methanol is promoted simultaneously. The highest yield of methanol up to 365.08 μmol−1 g−1 h−1 appears at 20 wt% Ag on MoS2. Finally, a reasonable photocatalytic reaction mechanism is proposed. [ABSTRACT FROM AUTHOR]