Unassisted Solar Syngas Production by a Molecular Dye-Cobalt Catalyst Assembly in a Tandem Photoelectrochemical Cell
ACS ENERGY LETTERS(2024)
摘要
The ecological transition requires the development of carbon capture and utilization technologies powered by renewable energies. Direct solar conversion of CO2 in photoelectrochemical cells is a promising approach to produce syngas, en route to fuels and chemicals. We report here on a dyad based on a Ru-based metallorganic dye and a tetraazamacrocyclic cobalt catalyst grafted on NiO to form efficient molecular photocathodes for CO-rich syngas production (ratio of CO/H-2 > 80:20) from a CO2-saturated aqueous bicarbonate buffer. After integration with a BiVO4/CoPi photoanode in a tandem photoelectrochemical cell in a Z-scheme configuration, syngas could be produced from CO2 water with Faradaic efficiencies (FE) of 62 % and 14 % for CO and H-2, respectively, under visible light and in the absence of any applied bias, equating to a solar to fuel conversion efficiency of 1.3 x 10(-2) %.
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