INS13-0135
Hybrid Photocatalyst Based on Polymer Dots and Pt-Decorated TiO2 Nanofibers for Solar-Driven NADH Regeneration and Enzymatic CO2 Reduction
Topic
S13. Korea-Germany Polymer Symposium 2026: “Pioneering the Future of Polymeric Materials and Bridging Innovation in Sustainable Technologies”
When and Where
Sep 30, 2026
11:10 - 11:35
Room 203
Session Chairs
Bastian E. RAPP
Presenter(s)
Taek Seung Lee (Chungnam National University)
Co-Author(s)
Abstract
Converting CO2 into useful chemicals is recognized as a key step in the circulation of carbon resources and the implementation of sustainable chemical processes. Although the photocatalytic enzymatic reduction of CO2 offers high selectivity under mild conditions, it requires a continuous supply of the reducing cofactor, nicotinamide adenine dinucleotide (NADH), to sustain efficiency. Although solar-driven photocatalysis is an eco-friendly approach, traditional TiO2 is limited by poor visible-light absorption. We fabricated an organic–inorganic hybrid photocatalyst by immobilizing visible-light-active semiconducting polymer dots onto Pt-functionalized UV absorbable TiO2 nanofibers. This architecture facilitated efficient photoinduced charge transfer, achieving ~75% NADH regeneration within 30 min, which was more than 15-fold increase over bare TiO2, maintaining high selectivity for the biologically active 1,4-isomer. To demonstrate the practical utility, the regenerated 1,4-NADH was coupled with formate dehydrogenase to drive the enzymatic reduction of CO2 to formate. The co-localization of all components ensured easy recovery and reusability, representing a robust transition from light harvesting to biosynthetic carbon fixation.
