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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.