(562c) An Integrated CO2 Capture and Conversion Device based on Metal-Organic Framework -and Cu Nanostructured Electrocatalyst

Marei, N. N. - Presenter, University of Calgary
Kibria, M. G., University of Calgary
Shimizu, G. K., University of Calgary
There is no doubt that CO2 emissions and its proportion in the atmosphere are rising sharply due to growing world population and as a result of fossil fuel production and consumption outcomes. This is a significant motivation for the scientific community to focus on CO2 capture and utilization strategies to make carbon-based chemical feedstocks. One such process, the electrochemical CO2 reduction reaction, enables the conversion of CO2 into valuable hydrocarbons and alcohols. However, efficient electrocatalysts need to be employed for CO2 reduction reaction to become competitive with traditional fossil fuel‐based technologies.

On the other hand, emerging research into organic and inorganic hybrids and Metal-Organic-Frameworks “MOF” have shown promise as a new class of porous materials with micropores or mesopores. Because recent MOF research has shown high capacity and selectivity towards CO2 capture even at ambient temperature, it appears promising as a possible material to serve as a catalyst or concentrator for CO2 conversion. In this study, we are developing an integrated device, wherein MOF based porous materials serve as CO2 concentrator and subsequently a Cu based nanostructured catalyst electrochemically converts CO2 into valuable C2+ based products. Carbon fiber sheet was used as a platform to conduct the current and support the MOF and Cu catalyst for CO2 capture and electrochemical reduction reaction, respectively. One side of the carbon fiber is coated with Zinc-based MOF with 500 m2/g Langmuir surface area, and an adsorption capacity of 4 mmol/g CO2 at 20℃. The MOF particles were synthesized in-house and followed with a set of characterizations including, TGA, XRD, FTIR, and gas sorption. The MOF layer served as a CO2 concentrator and a screening stage, where it allows higher percentage of CO2 molecules to pass through the fiber to the other side. The other side of the fiber was coated with Cu2O particles to catalyze the electrochemical reduction reaction. Spray coating technique was used to spray coat MOF and Cu2O onto the carbon fiber. The spray coating process took place after individually mixing the Cu2O and MOF particles in Methanol/Nafion solution to maintain a certain level of rigidness and stability on the substrate surface. Binary gas feed N2 50%/CO2 50% was used for the electrochemical reduction experiments in a flow-cell configuration. The initial results showed high C2+ products selectivity, conversion efficiency, and catalyst stability.