Boosting Photothermal CO2 Hydrogenation with H2O by MIL-100(Fe) Derived Fe@C Confined Ni2P

The conversion of CO2 into chemical products or fuels of great value always remains an outstanding challenge. Here, we report a heterojunction Fe@C/Ni2P composite catalyst obtained by preparing MIL-100(Fe) derived Fe@C confined Ni2P nanoparticles, which is applied to photothermal catalytic CO2 hydrogenation with H2O. Without adding any sacrificial agents or co-catalysts, the optimal Fe@C/Ni2P sample shows higher yields for CO2-to-C2H6 and CO2-to-CO yield of 5.83 μmol g−1h−1 and 179.9 μmol g−1 h−1 than that of pristine Fe@C and Ni2P, respectively. The experimental results indicated that the obtained Fe@C/Ni2P can act as catalytic sites to adsorb, activate, and convert CO2 under low-intensity LED light irradiation (420 nm) with a temperature of 200 ℃. The physical structure, photochemical properties and energy band structure of the Fe@C/Ni2P composite catalysts were investigated by XRD, XPS, FT-IR, TEM, BET, respectively. Furthermore, the reaction pathway of Fe@C/Ni2P photothermal catalytic CO2 hydrogenation with H2O to C2 products and CO were systematically analyzed by in situ infrared spectroscopy (DRIFTS).