Abstract
Developing high efficiency, environmentally friendly, and low-cost mesoporous Pt/ZnS photocatalyst for CO2 conversion to CH3OH is significant for clean energy conversion. Herein, we described a facile synthesis of mesoporous ZnS framework decorated Pt NPs as high efficiency for CO2 conversion through visible light illumination. The results indicated that Pt/ZnS nanocomposites showed that the structural and crystallinity integrity of polyhedral heterojunction obviously maintain after incorporating Pt NPs, and they are well-distributed on the ZnS surface with particles size about 3-5 nm. The optimized photocatalyst 1.5% Pt/ZnS nanocomposite could prominently exhibit a high photocatalytic efficiency compared to undoped ZnS. Remarkably, the yield of CH3OH of 400 mu molg(- 1) in 9 h over 1.5% Pt/ZnS nanocomposite indicated a significantly promoted CH3OH formation, nearly 22-fold greater than that of the undoped ZnS NPs, which substantially verified the great promoting potential for conversion of clean energy. The CH3OH formation rate over mesoporous 1.5% Pt/ZnS nanocomposite (44.5 mu molg(-1) h(-1)) is larger 24 times than that of undoped ZnS NPs (1.86 mu molg(-1) h(-1)). The recycled Pt/ZnS photocatalyst does not alter the CH3OH formation remarkably after five repeating cycles with excellent durability. Electrochemical impedance spectroscopy, photocurrent response, and photoluminescence analyses were investigated to support our results and suggested mechanism for enhancement of CO2 conversion to CH3OH.