Electrocatalytic Reduction of Carbon Dioxide using Bi Dispersed -Nitrogen Doped Ordered Mesoporous Carbon

Recent studies have been extensively explored the use of Ordered Mesoporous Carbons (OMCs) in electrochemical applications. These interests arise from the uniform and adjustable channels, enhanced diffusion of electrolytes and redox-active species, as well as excellent electrical conductivity. These remarkable properties make them highly valuable for electrode modification and electrocatalytic applications. Nitrogen-doped ordered mesoporous carbon (N-doped OMC) exhibits superior chemical and electrochemical performance as a result of their unique properties derived from the nitrogen lone-pair electrons. On the other hand, Electrochemical CO۲ reduction reaction offers a promising pathway for sustainable energy storage and the effective utilization of CO۲. Accordingly, advancing low-cost and selective electrocatalysts for the electrochemical CO۲ reduction in aqueous environment poses a major challenge. Hybrid structures composed of metal complexes or metal nanoparticles integrated with OMCs have emerged as promising electrocatalysts for the efficient and selective conversion of CO۲ into value-added products. Bismuth is considered one of the most promising candidates for CO۲ electroreduction. However, challenges such as limit conductivity and complex synthesis processes restrict its scalability for real-world application. In this work, a facial method was developed to prepare bismuth dispersed N-doped OMC. The N-doped OMC (GIOMC) was synthesized via carbonization of ۱-methyl-۳-phenethyl-۱H-imidazolium hydrogen sulfate (MPIHS) in the presence of ordered mesoporous silica SBA-۱۵ as a structural guide and guanine as nitrogen sources. Nitrogen centers of GIOMC introduces sufficient nitrogen-containing groups, facilitating the anchoring of Bi nanoparticles enhanced intermediate adsorption properties, suitable surface wettability, and improved electron transfer. The Bi/GIOMC catalyst exhibited a promoted CO۲ reduction with high Faradaic efficiency and current density.

کلیدواژه ها:

Ionic liquid Derived Ordered Mesoporous Carbon ، Electrocatalytic CO۲ Reduction Reaction ، Electrocatalyst ، Bismuth