Solar Hydrogen Project Group Update 25 th August 2009.

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Presentation transcript:

Solar Hydrogen Project Group Update 25 th August 2009

Solar Hydrogen Project Palang Bumroongsakulsawat 25 th August 2009

WO 3 in 1M H 2 SO 4

WO 3 in 1M H 2 SO 4 : Illuminated (White Light)

WO 3 in 1M H 2 SO 4 : Chopped Illumination

Photoelectrochemistry Paper(s) “Electrochemical characterisation of Fe 2 O 3 thin- film photoelectrodes” –Impedance analysis (FRA and Mott-Schottky) –Photocurrent transient behaviour –Identification and explanation of the “anomalous” ac photocurrent behaviour Comparison of thin-film WO 3 photoelectrodes by different deposition methods

Solar Hydrogen Project Zack Ulissi 25 th August 2009

Over PotentialNernst PotentialBand Bending Interface (Anode) Interface (Cathode) Resistance (Solution) Resistance (Membrane)

Over PotentialNernst PotentialBand Bending Interface (Anode) Interface (Cathode) Resistance (Solution) Resistance (Membrane)

Interface (Anode) Interface (Cathode) Resistance (Solution) Resistance (Membrane) Potentiostat Albery et al. 1996

Interface (Anode) Interface (Cathode) Resistance (Solution) Resistance (Membrane) Same Current Density at Anode/Cathode Anode Current Anode Overpotential Cathode Current Cathode Overpotential

Interface (Anode) Interface (Cathode) Resistance (Solution) Resistance (Membrane) 0 Single Channel (no membrane) Nernst-Planck Equations, with Electroneutrality, for Na, Cl, H, OH Equilibrium H/OH DiffusionMobilityConvection

pH Distribution as a function of potentiostat setting pH V

pH Distribution as a function of potentiostat setting V pH

Current density along reactor length Current Density, Average Current Density 5 A/m 2 Distance Along Reactor A/m 2

Effective I-V Curves Current Density [A/m 2, Potentiostat Voltage (NOT the overpotential!)

Next steps Update report with new methods Finish converting work to 3D case (relatively straightfoward, but need faster computers) Double check exiting codes Confirm reactor parameters Add effect of band bending from Mott- Schottky plots Use Buttler-Volmer kinetics for H2 evolution Couple new kinetics with gas evolution

Solar Hydrogen Project Chris Carver 25 th August 2009

POTENTIOMETER SOLAR SIMULATOR PUMPRESERVOIR / H2 COLLECTION PEC REACTOR PC

PHOTOANODE AB