Visible-light induced hydrogen and formic acid production from biomass and carbon dioxide with enzymatic and artificial photosynthesis system

Hydrogen and formic acid as a hydrogen energy storage material productions system coupling the glucose oxidation with glucose dehydrogenase (GDH), and hydrogen and formic acid productions with platinum nano-particle and formate dehydrogenase (FDH) as a catalyst combination of visible light-induced photoreduction of methylviologen (MV2+) by water soluble zinc tetraphenylporphyrin tetrasulfonate (ZnTPPS) via the NADP+/NADPH redox cycle in the carbon dioxide saturated solution is developed. After 90 min irradiation to above system, the amount of hydrogen and formic acid productions in the system were estimated to be 4.3 and 0.2 μmol, respectively. Hydrogen gas and formic acid as a hydrogen gas carrier molecule were simultaneously produced from the glucose as a biomass and carbon dioxide by using this system.