7 th Korea-US Nanoforum Nanostructured Materials for Light Conversion and Energy Storage Conversion and Energy Storage Hyunwoong Park School of Physics and Energy Science Kyungpook National University Kyungpook National University
Solar-Powered Urban Metabolism
Major Hydrogen Production Processes 95% in the U.S. + → + CH H O CO 3 H 4 2 2 48% in the world 48% in the world + + → → + + CO CO H O H O CO CO H H 2 2 2 Huge Carbon Footprint CO /H CO 2 /H 2 (w t) = 2.5 (w t) = 2 5 Incomplete Reaction → CO generation CO ti Source: www.hydrogenassociation.org/general/factSheets.asp
Key Findings from the Commercial Electrolysis Electrolysis 54-67 kWh/kg-H 2 39 kWh/kg-H 2 Electricity cost is a major component of H 2 cost Source: Summary of Electrolytic Hydrogen Production, NREL 2004
Solar Light-Driven Electrolysis w ith Water Treatment Treatment PV Fuel Cell M Hydrogen Storage H 2 O H 2 O 2 or Air CO 2 Cathode Anode H 2 P Wastewater Treated water
PV-Electrochemical Hybrid 13:30 10:10 11:00 11:50 12:40 14:20 15:10 20 1150 m -2 ) (C) Ι S (W m Temp 15 1100 10 1050 4.4 1.0 E Cell (V) I Cell (A) 4.2 0.8 4 0 4.0 0 6 0.6 Phenol 0.4 30 1.2 n) n) ( μ mol/min 0.3 0 3 0.9 0 9 mmol/min 20 C t /C 0 0.2 0.6 [H 2 ] (m C [CO 2 ] ( 10 0.1 0.3 0.0 0 0.0 0 50 100 150 200 250 300 April 18, 2007, Sunny Time (min)
Acknowledgements K-CAP National Research Foundation National Research Foundation Dr. Soonhyun Kim at DGIST Photoenergy Conversion (PECL) group members Photoenergy Conversion (PECL) group members 2 nd -year grads 1 st -year grads TNT-Fe 2 O 3 TiO 2 nanofiber ZnO nanorod CNT-H 2 M-Fe 2 O 3 Electrocatalysts WO 3
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