Re-envisioning a sustainable hydrogen energy economy

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Slide 54 ⎪ ⎪ ⎭ ⎪ ⎪ ⎬ ⎫ ⎪ ⎪ ⎩ ⎪ ⎪ ⎨ ⎧ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α − − η + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α η + ⎪⎭ ⎪ ⎬ ⎫ ⎪⎩ ⎪ ⎨ ⎧ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α − − η − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α η = O O FC sat O O O O E sat O O O O O O O O O cell j j RT )2F (1 exp j j RT 2F exp 1 RT )2F (1 exp RT 2F exp j j ⎪ ⎪ ⎭ ⎪ ⎪ ⎬ ⎫ ⎪ ⎪ ⎩ ⎪ ⎪ ⎨ ⎧ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α − η + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α − η + ⎪⎭ ⎪ ⎬ ⎫ ⎪⎩ ⎪ ⎨ ⎧ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α − η + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ α − η − = H O FC sat H H H O E sat H H H H H H H O H cell j j RT )2F (1 exp j j RT 2F exp 1 RT )2F (1 exp RT 2F exp j j Oxygen electrode Hydrogen electrode Use same equations for both modes by changing signs of overpotentials (η O and η H ) and hence current densities between modes
URFC model outputs - 2 • Fitting modelled V-I curves to experimental curves • Finding best values for exchange current densities and charge transfer coefficients for both electrodes, and saturation current densities in E and FC modes 2.5 Voltage, [V] 2 1.5 1 0.5 O α = 0.4400 H α = 0.8174 O j O = 4.77x10 -9 A/cm 2 H j O = 7.02x10 -4 A/cm 2 sat j E = 0.2 A/cm 2 sat j FC = 0.165 A/cm 2 E ‐ mode ‐ Theoretical model curve FC ‐ mode ‐ Theoretical model curve E ‐ mode ‐ Experimental curve 0 ‐0.15 ‐0.10 ‐0.05 0.00 0.05 0.10 0.15 0.20 FC ‐ mode ‐ Experimental curve C urrent Density, [A/c m 2 ] URFC cell constructed at RMIT: active membrane area 5 cm2; catalysts - 4 mg/cm2 Pt black on H side and 4 mg/cm2 Pt black on O-side Slide 55
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Re-envisioning envisioning a sustai
Page 3 and 4: The hydrogen economy - origins “T
Page 5 and 6: A solar-hydrogen system at the loca
Page 7 and 8: 500 W PEM fuel cell CHP experimenta
Page 9 and 10: The original vision of a hydrogen e
Page 11 and 12: Renewable paths to hydrogen >2000 K
Page 13 and 14: Recent ‘sustainable’ energy sce
Page 15 and 16: Studies are showing H2 for transpor
Page 17 and 18: Seven principles underlying the SHE
Page 19 and 20: Sustainable hydrogen centre hierarc
Page 21 and 22: Coastal Hydrogen Centre (CHC) • S
Page 23 and 24: Inland Hydrogen Centre (IHC) • Di
Page 25 and 26: Hydrogen FC and battery systems: ba
Page 27 and 28: RMIT University©2010 SAMME 27
Page 29 and 30: Honda FCX Clarity hydrogen car •H
Page 31 and 32: Towards sustainable transport Horse
Page 33 and 34: Hydrogen for longer-duration energy
Page 35 and 36: Seasonal variation of wave power -
Page 37 and 38: Bulk hydrogen storage as strategic
Page 39 and 40: The H-skeptics 1: David McKay Count
Page 41 and 42: SHE is a promising vision, but adva
Page 43 and 44: Grand goal • Autonomous, zero-emi
Page 45: The reversible electrolysis - fuel
Page 48 and 49: Solid state storage Metal hydrides:
Page 50 and 51: Unitised Regenerative Fuel Cells (U
Page 52 and 53: E ▲ Oxygen side Anode Hydrogen si
Page 56 and 57: URFCs: main technical challenges
Page 58 and 59: Conventional and direct coupling of
Page 60 and 61: PEM electrolyser characteristics 5
Page 62 and 63: Series—parallel stacking of PV pa
Page 64 and 65: Direct coupling of RMIT 2.4 kW PV a
Page 66 and 67: RMIT fuel cell truck project 1/14 s
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Re-envisioning a sustainable hydrogen energy economy

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