Water‐Mediated Selectivity Control of CH₃OH versus CO/CH₄in CO₂Photoreduction on Single‐Atom Implanted Nanotube Arrays

Abstract

Controllable methanol production in artificial photosynthesis is highly desirable due to its high energy density and ease of storage. Herein, single atom Fe is implanted into TiO2/SrTiO3 (TSr) nanotube arrays by two‐step anodization and Sr‐induced crystallization. The resulting Fe‐TSr with both single Fe reduction centers and dominant oxidation facets (001) contributes to efficient CO2 photoreduction and water oxidation for controlled production of CH3OH and CO/CH4. The methanol yield can reach to 154.20 µmol gcat−1 h−1 with 98.90% selectivity by immersing all the catalyst in pure water, and the yield of CO/CH4 is 147.48 µmol gcat−1 h−1 with >99.99% selectivity when the catalyst completely outside water. This CH3OH yield is 50 and 3 times higher than that of TiO2 and TSr and stands among all the state‐of‐the‐art catalysts. The facile gas–solid and gas–liquid–solid phase switch can selectively control CH3OH production from ≈0% (above H2O) to 98.90% (in H2O) via slowly immersing the catalyst into water, where abundant •OH and H2O around Fe sites play important role in selective CH3OH production. This work highlights a new insight for water‐mediated CO2 photoreduction to controllably produce CH3OH.

New two fold interpenetrating 3D polyoxovanadate-based metal–organic framework as bifunctional catalyst for the removal of 2-chloroethyl ethyl sulfide and phenolic compounds

“…According to previous reports, we speculate that the catalytic mechanism is that POVs primarily interact with hydrogen peroxide to generate active peroxide, which is the actual catalyst for oxidation reactions. During the catalytic process, the oxidant is attacked to form a metal peroxide intermediate, and the metal oxidation is oxidized by the metal peroxide intermediate [52]. After the catalytic reaction was completed, the catalyst was recovered, filtered, and washed with methanol for reuse in the oxidation of CEES to CEESO.…”