artificial photosynthesis: strategies for solar fuel ... · artificial photosynthesis: strategies...
TRANSCRIPT
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Artificial Photosynthesis:
Strategies for Solar Fuel
ProductionMcNamara Research Group
The College of William and Mary
Fall 2014
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• 20 TW of energy consumed globally per year
• 1.2 x 105 TW of solar energy potential
• Can be harnessed and used for fuel (plants) and electricity
(humans)
• No emission of CO2
• Political and environmental drawbacks of oil.
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Solar EnergyWhy Solar?
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Electron Donor
Water Reduction
H2
H+
H2
H+H2O
O2
Electron Acceptor
Water Oxidation4
Strategy for Artificial Photosynthesis
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Abundance of Elements
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New Electrocatalysts for H+ Reduction
Hydrogenase Mimics
Darensbourg et al. J. Am. Chem. Soc. 2004, 12004-120146
Polypyridyl Ligand Synthesis:
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Tetradentate Fe Complex
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Activity of Fe-NNNO Complex
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Catalyst Variations
Catalyst ic/ip Overpotential Water?
(1)
7.8 800 mV
Improves
Greatly
(2)
4.7 300 mV Improves 12%
(3)
13 800 mV Improves 11%
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Photocatalysis
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Systems for Solar Hydrogen
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LED illumination
Temperature Controlled
EDM ball spinner Disco ball motor rotates 6 samples
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0
200
400
600
800
1000
1200
0 5 10 15 20 25 30
TON
Time (hours)
H2 Generation Over Time
After 24 hours:
• Over 1000 TON
• Over 180 µL H2 generated12
Using “Dirty Water”
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Heterogeneous Systems
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Goal: attach dye and catalyst to semiconductor to make
integrated system for hydrogen generation
The study of electron transfer is in collaboration with the
Wustholz group at WM
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Acknowledgements
Megan
RRRRRRRRICO
Nick• Carolyn Hartley (’16, GS1 UNC-CH)
• Ryan J. DiRisio (’17, GS0 UW)
• Jessica Armstrong (’17, Fulbright)
• Shichuan “Rico” Xi (‘18)
• Megan Screen (‘18)
• Nick Race (M.S. expected ‘18)
• Brett Barden (’18)
• James C. Lennox (GS4, UNC-CH)
• Gannon Connor (’14, GS3 Yale)
• Kathryn Mayer (’15, GS2, UCSD)
• Connor Tribble (’14, Boston Analytical)
• Matthew Van Dongen (’14, EVMS)
• Patrick Crossland (’15, GS2 Minnesota)
• Catherine Wise (’15, GS2 Yale)
• Wanji Zhang (’16, GS1 Caltech)
• Dan Liu (M.S. ‘15, GS2 Emory)
• Andrew Cavell (’15, GS2 Wisconsin)
• Alexis Silva (’15 UCLA Dental School)
• Trevor Chang (’15, GS1 UCLA)
• Michael Allen (‘14)
• Jason Fulbrook (’14, GS1 VCU PharmD)
• Prof. Robert D. Pike (WM)
BrettIndi
WillzZach
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Questions?
Come see me if interested!!
Spots available for Freshman/Sophomores (1-2)
Office: ISC 2035
Lab: ISC 2024