Photocatalytic CO2 reduction with new band gap energy evaluation from spectroscopic relationship of graphene-Mg2CuSnCoO6 composite bridged with organics

Abstract

A new structure of graphene-Mg 2 CuSnCoO 6 composite bridged with gallic acid (GMG) was synthesized with a novel method. Band gap energy of the newly synthesized nanocomposite was evaluated with a laser-wavelength region and DRS method. Evaluation and analysis were based on the relationship among XRD, HRTEM, XPS, Raman scattering, and computer simulated model structure. Changes in the structure of graphene or graphene-based composite were associated with location changes of the valence band and the conduction band. Electron density was used to confirm the number of electrons by computer simulation. Finally, such graphene-Mg 2 CuSnCoO 6 -gallic acid nanocomposite was used for photocatalytic CO 2 reduction into methanol. Under UV-light irradiation, the highest methanol yield was 5.576% with 0.6 g of scavenger. This work might offer a promising strategy for measuring band gap energies of different types of semiconductors. • Synthesis of new-structured Graphene-Mg 2 CuSnCoO 6 composite bridged with Gallic acid. • The evaluation of new band gap energy value. • Photocatalytic activity for the CO 2 reduction by novel ternary nanocomposite. • The high methanol production rate with scavengers. • High stability and photocatalytic efficient properties for production of solar fuel.