Gas-phase electrocatalytic reduction of carbon dioxide using electrolytic cell based on phosphoric acid-doped polybenzimidazole membrane

摘要

Carbon dioxide transformation to fuels or chemicals provides an attractive approach for its utilization as feedstock and its emission reduction.Herein, we report a gas-phase electrocatalytic reduction of CO_2 in an electrolytic cell, constructed using phosphoric acid-doped polybenzimidazole(PBI) membrane, which allowed operation at 170°C. Pt/C and Pt Mo/C with variable ratio of Pt/Mo were studied as the cathode catalysts. The results showed that Pt Mo/C catalysts significantly enhanced CO formation and inhibited CH_4 formation compared with Pt/C catalyst. Characterization by X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy revealed that most Mo species existed as MoO_3 in Pt Mo/C catalysts and the interaction between Pt and MoO_x was likely responsible for the enhanced CO formation rate although these bicomponent catalysts in general had a larger particle size than Pt/C catalyst.