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Air Electrode in Hydrogen Fuel Cell

Air Electrode in Hydrogen Fuel Cell. Mentors: Dr. Flanders & Dr. Sorenson. Physics REU 2012 Diana Gutierrez Zedano. Hydrogen Fuel Cell. external circuit. Air electrode. cathode. anode. H 2 source. H 2  2H + + 2e -. O 2 in air. O 2 + 4e -  2O 2-. reduction.

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Air Electrode in Hydrogen Fuel Cell

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  1. Air Electrode in Hydrogen Fuel Cell Mentors: Dr. Flanders & Dr. Sorenson • Physics REU 2012 • Diana Gutierrez Zedano

  2. Hydrogen Fuel Cell external circuit Air electrode cathode anode H2 source H2 2H+ + 2e- O2 in air O2 + 4e- 2O2- reduction 2H+ + O2- H2O H+ O2- green waste electrolyte varies

  3. Cross Sectional View of the Air Electrode • Gore-tex • Gold • PEDOT • Carbon Aerosol Gel Bjorn Winther-Jensen et all. High Rates of Oxygen Reduction over a Vapor Phase–Polymerized PEDOT Electrode. Science. August 2008: 671-674

  4. Gore-tex Fabric • Hydrophobic - keeps electrolyte from going through the pores • Porous - “breathable” Academy of Art University of San Francisco

  5. Carbon Aerosol Gel • Acetylene or ethylene with oxygen are kept in a fuel rich chamber and ignited by a spark. This produces an incomplete combustion which allows for the aggregation of carbon particles • Pores confined within fractal structure • Black color (like PEDOT): use Raman spectrum to differentiate • Bands: D 1330, G 1580, G’ 2646

  6. PEDOT poly(3,4-ethylenedioxythiophene) • Low electrical conductivity: gold layer is needed • O2 reduction catalyst O2 + 4e- 2O2- • Not sensitive to carbon monoxide • Raman Spectrum Band: Double carbon bond Wikipedia

  7. Experimental Process • Carbon aerosol gel is pressed on Goretex • Resistance varies from 25 to 3 kilo ohms • Electro deposition of gold on carbon-coated Goretex. • 20 mM HAuCl4 • 2 V DC • Electro polymerization of PEDOT film on gold-coated Goretex. • 10 mM EDOT and 20 mM PSS • 2 V DC

  8. Raman Spectrum for Air Electrode

  9. Testing Air Electrode • Half of the hydrogen fuel cell • Electrolyte: 1M H2SO4 Copper tape Working Electrode Pt Counter Electrode O2 in air H2SO4 O2 + 4e- 2O2-

  10. Air electrode test data

  11. Future Plans • Air electrode needs to be tested in an oxygen free environment. • Work out a method to enhance the amount of PEDOT deposition

  12. Acknowledgments • I would like to thank: • NSF for funding • Dr. Flanders and Dr. Sorenson who guided me through the project • Govind Paneru for teaching me the skills I needed for my project • Dr. Flanders, Dr. Sorenson and Arjun Nepal who made the carbon aerosol gel sample • Dr. Weaver and Dr. Corwin for coordinating the program

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