L06-prod2 - Hydrogen Production 1 8/19/2005 LECTURE LECTURE...

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Unformatted text preview: Hydrogen Production 1 8/19/2005 LECTURE LECTURE LECTURE LECTURE # # # # 6 TOPIC TOPIC TOPIC TOPIC: H y d r o g e n P r o d u c t i o n Hydrogen Production 2 8/19/2005 ELECTROLYSIS s Michael Faraday in 1820 first formulated the principle of Electrolysis s Water is broken into hydrogen and oxygen s Requires electricity and electrolyte s To isolate the gases produced ion- conducting separators (diaphragm) are present Hydrogen Production 3 8/19/2005 Electrolysis Basic Schematic of electrolysis Source: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/electrol.html Hydrogen Production 4 8/19/2005 Chemical reactions involved s The overall chemical equation for electrolysis is s Reaction at the Anode s Reaction at the Cathode ( 29 2 2 2 2 2 H O y Electricit Energy O H + +- + + + e H O O H 2 2 5 . 2 2 2 2 2 H e H +- + ELECTROLYSIS Hydrogen Production 5 8/19/2005 The equilibrium potentials of the cathode, Ec and anode, Ea can be written as: 2 2 2 2 2 2 ln 2 H O H O H o H c a a a F RT E E- + = 2 2 1 2 2 2 ln 2- + = OH O H O o O a a a a F RT E E ELECTROLYSIS Hydrogen Production 6 8/19/2005 s At 250C and 1 atm lowest voltage needed for the reaction - 1.229V s Ideal condition 83.7% of heat is obtained form electricity and rest from surrounding s Thus conversion efficiency 120% s Under isothermal condition 100% utilization of electrical energy for H2 production s Thermoneutral voltage 1.47V ELECTROLYSIS Hydrogen Production 7 8/19/2005 s Types of Electrolysis include: b Alkaline water, Solid Polymer, Solid Oxide, Seawater s Renewable powered electrolysis b Photovoltaics b Solar Thermal Power (Concentrators) b New Developments...
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L06-prod2 - Hydrogen Production 1 8/19/2005 LECTURE LECTURE...

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