Biphasic Titania Derivatives Of Titanium Metal-Organic Framework Nanoplates For High-Efficiency Photoreduction Of Diluted Co2 To Methane

Exploring earth-abundant materials for low concentration CO2 photoreduction is the key in the energy related field. Here, we demonstrated biphasic titania (anatase and rutile) derived from Ti-based metal-organic framework (MOF) nanoplates exhibited excellent performance in CO2 photoreduction without any co-catalysts and sacrificial agents under ambient condition, the maximum CH4 production rate was up to 65.39 mu mol g(-1) h(-1) with near 100 % electron selectivity as well as great stability. The activity of the optimal derivative was maintained well even in 1 % CO2 (CH4: 45.59 mu mol g(-1) h(-1)) and much better than that of commercial P25. The upgraded performance originated from the synergism between local anatase/rutile interface and numerous defective sites (Ti3+ and O-v), by promoting the separation and migration of photogenerated carriers, CO2 adsorption and activation, and H2O dissociation. Besides, a possible fast hydrodeoxygenation mechanism for methane formation was proposed according to in situ DRIFTS characterization.