Mn-based COF for electrochemical CO2 reduction to CO and formate
Changwei Liu a, Geyla caridad dubed bandomo a, Julio lloret-fillol a b
a Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
b Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluïs Companys, 23, 08010, Barcelona, Spain
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#e-FuelSyn - Electrocatalysis for the Production of Fuels and Chemicals
VALÈNCIA, Spain, 2023 March 6th - 10th
Organizers: Carla Casadevall Serrano and Julio Lloret Fillol
Poster, Changwei Liu, 306
Publication date: 22nd December 2022

Excessive consumption of fossil fuels causes severe environmental problems and diminishing fossil fuels poses a threat to energy reservation. Therefore, newer techniques to use clean energy are urgent, and converting waste formed by consuming fossil fuels, mainly CO2 into useful chemicals is in high demand. In this work, MnI tricarbonyl-based 2D covalent organic framework (COFbpyMn) is employed as a mechanically constrained heterogeneous electrocatalyst deposited on carbon paper for the reduction of CO2 in water. It is shown that the product selectivity can be shifted to CO and HCOOH using appropriate additives in the water. We observed HCOOH formation at a Faradic efficiency (FE) of 95% at a current density of 8 mA/cm2 in an H-cell and FE of 90% at a current density of 25 mA/cm2 in a flow cell in 1 M NaHCO3 containing pentamethyldiethylentriamine (PMDETA). Interestingly, when we swapped PMDETA with 2-tert-butyltetramethylguanidine (TBG), the product selectivity shifts to CO with FE of 98% at a current density of 2 mA/cm2 in a H/cell. Furthermore, we systematically explored the mechanistic pathway through spectro-electrochemical studies.

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