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Christopher CarverDr Klaus Hellgardt
SOLAR HYDROGEN: Photoelectrochemical Reactor Design
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INTRODUCTION
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SMR3
tC/tH2
Elec-trol-ysis
8 tC/tH2
Other
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Benefits
Fossil fuel reliance
Green house gases
Abundant resources
Durable & low maintenance
Energy security
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H2 O2
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H2 O2
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PHOTO-ANODE
CATHODE
H2
O2
240mm
210mm
70mm
100mm 100mm
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1.23 eV
0.6 eV
0.4 eV
0.1 eV
Theoretical water decomposition energy
Eg = 2.3 eVTh
eore
tical
Ove
rpot
entia
l
Reco
mbi
natio
n
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Design flexible test-bed reactor
- 10 x 10cm photoanode
- Photon absorption
- Quantum efficiency
- High mass transfer rate coefficients
- Separate hydrogen and oxygen
Hydrogen production
experiments
- Semiconductor material
- Electrode configuration
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WORK TO DATE
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Good absorptionStable in alkaliRecombination
Stable in acid/alkaliUV absorption only
Good efficiencyStable in acid
Fe2O3
TiO2 WO3
titanium PVDF
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quartz
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Butler-Volmer equation
Curr
ent d
ensi
ty (A
/m2 )
Overpotential (V)
Kinetic control
Transport control
Increasing mass transport rate
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PHOTO-ANODE
CATHODE
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FUTURE WORK
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PHOTOANODE
PHOTOANODE
LIGHT
quartz window
membrane
cathode
electrolyte
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Set Up Reactor
Electrical connections
Hydrogen extraction system
Evaluate reactor design
Experiments
Semiconductors / electrolyte
Electrode configuration
Multiple electrodes
Temperature
Analyse Results
Quantify H2 production
Optimise reactor design
Deliver
report
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THANK YOU
QUESTIONS?