Presentation Information
[3H08【論文賞】]Experimental Verification of Mixed-potential-driven Catalysis
*kotaro takeyasu1, Yuta Katane1,2, Naoto Miyamoto2, Mo Yan3, Junji Nakamura3 (1. Institute for Catalysis, Hokkaido University, 2. Graduate School of Science and Technology, University of Tsukuba, 3. International Institute for Carbon-Neutral Energy Research, Kyushu University)
Mixed-potential-driven catalysis is a novel framework in which electrochemical oxidation and reduction half-reactions proceed in pairs on catalyst surfaces without external voltage. We constructed a Cu/Pd-based model reactor and directly observed spontaneous reaction currents upon exposure to CO2 and H2, confirming mixed-potential formation. At 373 K and 40 atm, CO, methanol, and ethanol were produced - ethanol being a product not typical in thermal catalysis - suggesting electrochemical coupling between CO2 reduction and H2 oxidation. XRD revealed that Cu2O reduction influenced current and selectivity. We further demonstrated this mechanism in glucose and CO oxidation, and developed a theory based on Butler–Volmer kinetics to describe how overpotentials are partitioned by catalytic activity. This framework provides new design principles for non-equilibrium catalytic systems.