1 / 11

Model of PEM Fuel Cell Cathode

Sarah Hipple EGEE 520 May 3, 2007. Model of PEM Fuel Cell Cathode. Introduction. PEM Fuel Cell Structure Platinum Electrodes Very effective at splitting hydrogen at the anode Less effective at splitting oxygen at the cathode This Analysis: Focuses on transport of species through

marie
Download Presentation

Model of PEM Fuel Cell Cathode

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sarah Hipple EGEE 520 May 3, 2007 Model of PEM Fuel Cell Cathode

  2. Introduction PEM Fuel Cell Structure Platinum Electrodes Very effective at splitting hydrogen at the anode Less effective at splitting oxygen at the cathode This Analysis: Focuses on transport of species through the Cathode Species Distribution Velocity of molecules

  3. Governing Equations Darcy's Law Conservation of mass & momentum balance Equation: Maxwell-Stephan Equation Mass Balance Equation: where and

  4. Boundary Conditions (1) (2) (3)

  5. Solution Parameters Basic Operating Conditions: T=80°C Atmospheric Pressure

  6. Solution: Velocity Velocity:

  7. Solution: Oxygen and Water Distribution • From the left: • Graph of oxygen mass fraction at 5 x values; • Image of Oxygen mass fraction distribution; • Image of water mass fraction distribution

  8. Validation Comparison to work of Yi and Nguyen & He, Yi, and Nguyen On the left: Pressure On the right: Velocity Field

  9. Parametric Study Oxygen Concentration at the Interface with the Polymer Electrolyte Membrane Air as the cathodic feed (left image) Pure oxygen as the cathodic feed (right image) Importance Drying out of the membrane (too much oxygen/air) Reduction of power output (too little oxygen/air) Carbon monoxide poisoning prevention

  10. Conclusions • This model agrees with other authors’ models • This model can help determine species’ distributions and flow paths through the cathode in: • The existing model • A model with modified pressure, temperature, porosity, dimensions, or cathodic feed

  11. Image Sources Aguirre, Lauren. (2005, July). Nova: scienceNOW: How Fuel Cells Work: PBS. URL www.pbs.org/wgbh/nova/sciencenow/3210/01-fcw.html (visited 2007, January 30) Yi, Jung Seok, & Nguyen, Trung Van. (1998, April). An along-the-channel model for proton exchange membrane fuel cells. Journal of The Electrochemical Society, 145 (4), 1149-1159. He, Wensheng, Yi, Jung Seok, & Nguyen, Trung Van. (2000, October). Two-phase flow model of the cathode of PEM fuel cells using interdigitated flow fields. American Institute of Chemical Engineers. AIChE Journal, 46 (10), 2053-2064.

More Related