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Photocatalytic CO2 Transformation to CH4 by Ag/Pd Bimetals Supported on N-Doped TiO2 Nanosheet
- Tan, Dongxing, Zhang, Jianling, Shi, Jinbiao, Li, Shaopeng, Zhang, Bingxing, Tan, Xiuniang, Zhang, Fanyu, Liu, Lifei, Shao, Dan, Han, Buxing
- ACS applied materials & interfaces 2018 v.10 no.29 pp. 24516-24522
- alloy nanoparticles, ambient temperature, aqueous solutions, atmospheric pressure, carbon dioxide, ions, methane, nanosheets, nitrogen, oxygen, palladium, photocatalysis, photocatalysts, silver, titanium dioxide
- To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO₂ conversion to CH₄ under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO₂ nanosheet for CO₂ conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti³⁺ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO₂ reduction. It was found that CO₂ could be efficiently transformed to CH₄ under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH₄ can reach 79.0 μmol g–¹ h–¹. Moreover, the Ag/Pd bimetals supported on N-doped TiO₂ nanosheet exhibit high selectivity to CH₄. The as-synthesized photocatalyst can be well recycled for CO₂ reduction.