Abstract
Breaking the limitations of the intrinsic redox potential of perovskite oxides photo catalysts for catalytic CO2 reduction remains a big challenge. Here we report a new process to achieve the durability yet efficient CO2 reduction activity of various perovskite oxides (BiFeO3, LaFeO3 and LaNiO3) with an inactive CO2 photo-reduction ability via piezoelectrically polarization. Taking BiFeO3 (BFO) as a representative sample, the band tilting and structure compression of BFO reach the redox potential of CO2 reduction and build a piezoelectric field for CO2 adsorption and activation by introducing vibration energy, inducing a piezoelectric catalytic CO2 reduction process. Continued ultrasonic vibration with BFO achieves durability CO2 reduction to high production rates of CH4 (17.9 μmol g~(-1) h~(-1)) and CO (28.7 μmol g~(-1) h~(-1)), respectively. This crucial feature highlights the feasibility of piezoelectric catalysis for CO2 conversion by utilizing mechanical energy, which can break the limitation of intrinsic redox properties ot the perovskite oxides.
NSTL