Efficient electrolysis of CO2 capture solution to syngas over Ni‐N‐C catalyst

Abstract

AbstractCarbon dioxide (CO2) electrolysis is an important process for storing excess renewable electricity. However, this process is commonly carried out in a high‐purity‐CO2 environment. Here, we conduct a systematic investigation into the operational performance of CO2 capture solutions for producing syngas. Using Ni‐N‐C electrocatalysts, by reducing the thickness of the catalytic layer and accelerating the mass transport, we achieve 58.6% CO Faradaic efficiency at a current density of 100 mA cm−2 and a full cell voltage of 3.67 V. Efficient syngas (MolH2/MolCO = 1–4) production has achieved at a wide range of current densities, that is, 100 to 300 mA cm−2 using a 3 M KHCO3 solution. It is also demonstrated that the Ni‐N‐C electrocatalysts compared to commercial Ag catalysts show better impurity tolerance and CO selectivity. These findings underscore the potential of CO2 capture solution as a direct carbon source for CO2 electrolysis.