In-Situ Hydrothermal Synthesis of SnS.sub.2/SnO.sub.2/rGO Nanocomposites with Enhanced Photogenerated Electron Transfer for Photoreduction of CO.sub.2 to CH.sub.4

As an extremely promising technology about decarburization, the reduction of CO.sub.2 driven by sunlight shows a glamourous prospect, so it is valuable to design a sort of photocatalyst with excellent performance i.e., low cost, high photocatalytic activity and high product selectivity, which is the key factor to promote the further popularity of this technology in industry. In this work, the SnS.sub.2/SnO.sub.2/rGO ternary nanocomposites were successfully designed and fabricate through a simple one pot in-situ hydrothermal synthesis. It is worth noting that the XRD, SEM and Raman results indicate that the molar of SnS.sub.2 to SnO.sub.2 could be increased with the content of l-cysteine, and it is proved that the ternary material is simply adjustable. The separation and transference of photogenerated electrons and holes could be accelerated due to the reduced graphite oxide with outstanding electrical conductivity. At the same time, under the condition of inputting appropriate sulfur source precursors, appropriate pore size and pore volume structure characteristics are obtained, which further contributes the adsorption capacity of CO.sub.2. Moreover, the proper position of the conduction band improves the selectivity for photoreduction of CO.sub.2 to CH.sub.4 of SnS.sub.2/SnO.sub.2/rGO composite. Hence, under visible-near infrared light, the highest CH.sub.4 productivity of SnS.sub.2/SnO.sub.2/rGO ternary composite is 5.52 [mu]mol g.sup.-1 h.sup.-1. This work provides some references for the field of photocatalytic decarburization.