An article that was published recently in the Journal of The Electrochemical Society, “Carbon Dioxide Electrolysis to CO and O2 at High Selectivity, Stability and Efficiency Using Sustainion Membranes”, illustrates how carbon dioxide (CO2) electrolysis using renewable energy as an input provides a pathway to turn waste CO2 into valuable fuels and chemicals.
This article describes how the effect of new alkaline stable imidazole-based anion exchange membrane and related ionomers by Dioxide Materials are enabling the advancement of new and improved electrochemical processes to operate at commercially viable operating voltages, current efficiencies, and current densities. It provides a pathway to close the carbon cycle and at the same time to store renewable energy in the form of carbon-containing fuels.
Potentiometric runs at a fixed current of 200 mA/cm2 using Sustainion membranes and ionomers showed that one can maintain 98% selectivity at about 3V applied potential for five months, with a voltage increase of only 3 μV/hour. Other runs showed stable performance at 400 and 600 mA/cm2. These results pave the way for commercialization of CO2 electrolysis, providing a viable pathway to recycle CO2 back to fuels.