Many researchers consider the solar generation of fuels (solar energy stored in the form of chemical bonds such as hydrogen from water and reduced C1 products from CO2) as the best and essential solution for clean energy. While researchers in this field have achieved the efficient coupling of light absorption and charge separation with dark catalytic reactions to produce H2, CO, or formate as reduction products, sunlight-driven water splitting or CO2 reduction remains a formidable problem. We will discuss our recent results on CO2 hydrogenation with Ir and Co complexes in basic water and electrochemical H2 production by non-precious metal catalysts with low overpotentials and acid stability that are remarkably efficient. Also a photochemical water oxidation mechanism via O-O bond formation avoiding the non-PCET step of Ru(IV)=O/Ru(V)=O will be discussed as a low energy pathway.The research carried out at Brookhaven National Laboratory was supported under contract DE-AC02-98CH10886 with the U.S. Department of Energy and supported by its Division of Chemical Sciences, Geosciences, & Biosciences, Office of Basic Energy Sciences. Y.H. acknowledge Japan-U.S. cooperation project for research and standardization of Clean Energy Technologies for financial support.

From CO<sub>2</sub> hydrogenation by solar produced H<sub>2</sub> to photochemical water oxidation

246th National Meeting (2013)

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From CO2 hydrogenation by solar produced H2 to photochemical water oxidation

From CO₂ hydrogenation by solar produced H₂ to photochemical water oxidation