Electrochemical syngas production over Au/SrTiO3 and Fischer–Tropsch synthesis chemistry for long-chain hydrocarbons.

Syngas (a mixture of CO and H 2) has been utilized in industrial settings for the production of liquid fuels through Fischer–Tropsch (F-T) synthesis. The conventional methods of producing syngas involve energy-intensive processes utilizing coal, natural gas, or biomass. However, in order to promote more environmentally friendly practices, electrochemistry has emerged as an alternative approach. In this study, we demonstrate that syngas can be efficiently produced through electrochemical (EC) CO 2 conversion using Au-loaded perovskite strontium titanate (SrTiO 3) as a catalyst. By manipulating various parameters such as overlayer Au thickness, applied potential, electrolyte type, and concentration, we can easily control the ratio of CO to H 2. Moreover, our findings reveal that electrochemistry can directly initiate the minor channel of the F-T synthesis process. We also observe the occurrence of the EC F-T process in CO-saturated electrolyte, where CO molecules directly adsorb and interact with surface H to generate hydrocarbons. The analysis of the Anderson-Schulz-Flory equation demonstrates a strong linear relationship, confirming that the EC F-T synthesis follows the conventional F-T synthesis mechanism. This novel demonstration not only offers valuable insights into the development of EC syngas production but also enhances our understanding of the mechanism behind the formation of C 2+ hydrocarbon products. [Display omitted] • SrTiO 3 and Au-deposited SrTiO 3 electrodes were tested for Electrochemical CO 2 and CO reductions. • Tunable syngas was produced in electrochemical CO 2 reduction by varying experimental parameters. • Hydrocarbons of C n H 2n and C n H 2n+2 (up to C 7 compounds) were also produced both under CO 2 and CO condition. • Hydrocarbon production was understood by the conventional Fischer–Tropsch synthesis. [ABSTRACT FROM AUTHOR]