Temperature dependent product distribution of electrochemical CO2 reduction on CoTPP/MWCNT composite

Electrochemical reduction of CO2 to valuable products on molecular catalysts draws attention due their versatile structures allowing tuning activity and selectivity. Here, we investigate temperature influence conversion product selectivity over a Cobalt(II)-tetraphenyl porphyrin (CoTPP)/multiwalled carbon nanotube (MWCNT) composite in the range 20–50 ?. Faradaic efficiency changes with potential so that two-electron transfer CO formation is enhanced at low potentials temperatures while competing hydrogen shows an opposite trend. Multi-electron methanol more favorable whereas reverse applies for methane. Activity are analyzed DFT simulations identifying key differences between binding energies CH2O CHOH, strength CO, protonation CHO intermediate. This novel experimental theoretical understanding provides insight various conditions distribution.