Incorporating high surface area and high CO 2 adsorption capacity of metal−organic frameworks (MOFs) together with highly efficient semiconductor photocatalysts provides an ideal strategy for designing CO 2 reduction photocatalysts. Controllable growth of TiO 2 nanoparticles on MIL-101(Cr) can be obtained and yields MIL-101(Cr)@TiO 2 core− shell photocatalysts via a fluoride-assisted solvothermal method. Corrosion occurs on the surface of MIL-101(Cr) by the action of F − and generates an activated surface, facilitating the growth of a TiO 2 shell. MIL-101(Cr)@TiO 2 nanocomposites with different TiO 2 contents are remarkably fabricated by controlling the reaction conditions. The morphology, structure, surface area, and composition of the as-prepared MIL-101(Cr)@TiO 2 nanocomposites are investigated by various characterization methods. The EDS mapping images reveal that the Ti and O elements are uniformly distributed on the shell, but Cr and C elements are mainly situated at the core of the composite, which further indicates the successful synthesis of the MIL-101(Cr)@TiO 2 core−shell structure. The photocatalytic conversion of CO 2 into CH 4 is noticeably enhanced by the produced MIL-101(Cr)@TiO 2 octahedra inheriting both large surface area (387.3 m 2 g −1 ) and high CO 2 adsorption capacity. Compared to pure TiO 2 nanoparticles under the same conditions, the optimized MIL-101(Cr)@TiO 2 photocatalyst exhibits a much greater CO 2 conversion efficiency, with a CH 4 generation rate of 0.22 μmol h −1 g −1 . This work will advance the experimental and theoretical basis for exploring highly efficient CO 2 reduction photocatalysts.

The corrosion resistance of magnesium alloys can be effectively improved by surface treatment. In this study, a hydrophobic two-dimensional (2D) TiO2/MoS2 nanocomposite coating was fabricated on AZ31B magnesium alloy by an electrophoretic deposition method. The corrosion resistance of the coating was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy analyses. After being modified by a silane coupling agent (KH570), the TiO2/MoS2 coating changed from hydrophilic to hydrophobic, and the static water contact angle increased to 131.53°. The corrosion experiment results indicated that the hydrophobic 2D TiO2/MoS2 coating had excellent anticorrosion performance (corrosion potential: Ecorr = −0.85 VAg/AgCl, and corrosion current density: Icorr = 6.73 × 10−8 A·cm−2). TiO2/MoS2 films have promising applications in magnesium alloy corrosion protection.