Biphasic Titania Derivatives of Titanium Metal‐Organic Framework Nanoplates for High‐Efficiency Photoreduction of Diluted CO2 to Methane

Abstract Exploring earth‐abundant materials for low concentration CO 2 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 CO 2 photoreduction without any co‐catalysts and sacrificial agents under ambient condition, the maximum CH 4 production rate was up to 65.39 μmol 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 % CO 2 (CH 4 : 45.59 μmol 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 (Ti 3+ and O v ), by promoting the separation and migration of photogenerated carriers, CO 2 adsorption and activation, and H 2 O dissociation. Besides, a possible fast hydrodeoxygenation mechanism for methane formation was proposed according to in situ DRIFTS characterization.