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Biomimetic Systems for Solar to Fuel Conversion

Biomimetic Systems for Solar to Fuel Conversion. Christopher J. Chang UCB Chemistry LBNL Solar Energy Workshop 28-29 March 2005. Global Energy Deficit. 35 TW. Solar Energy 1.2 × 10 5 TW 600 TW available. ?. 10.1 TW short. 10,000 new nuclear plants (10 TW). 12.8 TW (U.S. 3.3 TW).

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Biomimetic Systems for Solar to Fuel Conversion

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  1. Biomimetic Systems for Solar to Fuel Conversion Christopher J. Chang UCB Chemistry LBNL Solar Energy Workshop 28-29 March 2005

  2. Global Energy Deficit 35 TW Solar Energy 1.2 × 105 TW 600 TW available ? 10.1 TW short 10,000 new nuclear plants (10 TW) 12.8 TW (U.S. 3.3 TW) wind/hydro (max 2.7 TW) renewable (0.3) nuclear (0.8) biomass (max 7 TW) wind/hydro (0.3) biomass (1.2) fossil fuels (10.2) fossil fuels (10.2 TW) World Energy Assessment, 2000 2000 2050

  3. Photosynthesis in a Beaker Solar energy stored in energy-rich molecules Hydrogen affords a clean, CO2-neutral fuel

  4. Reframing the Hydrogen Economy Solar energy stored in heteroatom molecules, not H2 Light must be used to drive reactions of M-X or M-O bonds

  5. Photosystem II: Nature’s Paradigm of Solar to Fuel Light Harvesting Catalysis/Energy Storage Proton-Coupled Electron Transfer

  6. Challenges for Biomimetic Solar to Fuel Conversion Multielectron Photochemistry (n 1hn/1e– events or 1hn/ne–) Bond-Forming Catalysis with Light Metals (O2, H2, X2 production using Mn, Fe, Co, Ni, Cu, Zn) Controlling Proton and Electron Transfer (facilitates charge separation and catalysis) Supramolecular Self-Assembly (spatial organization of components)

  7. O—O Bond Making and Breaking in Nature Photosystem II O—O formation Cytochrome c oxidase O—O cleavage DGin DGout G.T. Babcock Biochim. Biophys. Acta1998, 1365, 170

  8. Biomimetic Approach to O—O Bond Formation Attack of nucleophilic substrate on electrophilic metal–oxo O–Atom Transfer O—O Formation

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