Light-driven CO2 Reduction to Formic Acid with a Hybrid System of Biocatalyst and Semiconductor Based Photocatalyst

Effective light-driven conversion of CO2 to formic acid with a hybrid system consisting of photocatalyst TiO2 nanoparticle (P25), methylviologen (MV2+) as an electron mediating molecule and biocatalyst formate dehydrogenase (FDH) in the presence of triethanolamine (TEOA) as an electron donating molecule was investigated. After 120 min irradiation with a Xe lamp (>300 nm), 152 µM of formic acid was produced in a CO2 saturated buffer solution containing TEOA (300 mM), TiO2 nanoparticles (6.8 mg·L−1), MV2+ (0.5 mM) and FDH (7.5 µM).