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

Carbon 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 (Mol(H)(2)/Mol(CO) = 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.