[3A01-07] Topical symposium

9:00 AM - 9:30 AM JST(12:00 AM - 12:30 AM UTC)

[3A01【依頼講演】] Electrochemical reaction fields at sp-electron interfaces: From active sites to mixed potentials

*Kotaro Takeyasu¹ (1. Institute for Catalysis, Hokkaido University (Japan))

Carbon-based sp-electron materials bridge active-site design and electrochemical reaction fields. In this talk, I discuss electrochemical reaction fields at sp-electron interfaces, from active-site electronic activation to mixed-potential catalysis. ORR on nitrogen-doped and defective carbons is introduced as a model case, where defect-localized electronic states and nitrogen-related sites couple carbon π states with O₂-derived π* orbitals to activate oxygen without conventional transition-metal centers. The role of proton adsorption, hydration, and proton-conductive pathways around active sites will also be discussed. I then extend this view to mixed-potential-driven catalysis, in which anodic and cathodic half-reactions proceed simultaneously and autonomously establish a surface potential. This mixed potential acts as a reaction field that distributes overpotential between coupled half-reactions, thereby controlling reaction rate and selectivity.

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