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Proton Exchange Membrane Fuel Cells – Fundamentals and Applications 質子交換膜燃料電池 --- 原理與應用

Proton Exchange Membrane Fuel Cells – Fundamentals and Applications 質子交換膜燃料電池 --- 原理與應用. C. W. Lin Department of Chemical Engineering National Yunlin University of Science & Technology. Fuel cell technology. A Dream , Challenge Or A Necessity.

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Proton Exchange Membrane Fuel Cells – Fundamentals and Applications 質子交換膜燃料電池 --- 原理與應用

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  1. Proton Exchange Membrane Fuel Cells – Fundamentals and Applications 質子交換膜燃料電池---原理與應用 • C. W. Lin • Department of Chemical Engineering • National Yunlin University of Science & Technology

  2. Fuel cell technology A Dream , Challenge Or A Necessity

  3. Fuel cell as energy converter Mechanical energy conversion Thermal energy conversion Chemical energy of the fuels Electrical energy conversion

  4. A fuel cell consists of two electrodes sandwiched around an electrolyte. Oxygen passes over one electrode and hydrogen over the other, generating electricity, water and heat. + - H H H2 O + O2 - H H + - H H2 H O2 + O - H H National Yunlin University of Science & Technology Functional Polymer Lab.

  5. High energy-conversion efficiency Thermodynamic efficiency for fuel cells and Carnot efficiency for heat engines

  6. What is a fuel cell? Proton and hydroxyl conducting fuel cells

  7. Modular design Fuel cells for different scale applications

  8. Small transportation Can we apply small technologies to become more sustainable?

  9. DMFC Application: Portable Power

  10. DMFC: Working principle e e CH3OH+H2O CO2+6H++6e Anode O2+4H++4e  2H2O Cathode H+ transport H2O CH3OH O2 H2O fuel crossover D R Y H+ transport Catalyst poisoning Pt-CO fuel crossover H2O CO2 H+ transport

  11. Methanol crossover Hybrid membranes, nanocomposites, etc Catalyst poisoning (Pt-CO) Better complex catalyst (Pt-X), higher temperature (>120°C) Slow “water shift reaction” (CH3OH+H2O  CO2+6H++6e) below ~100 °C Better complex catalyst, higher temperature But the higher the temperature, the worse the water balance in membrane Water-free membranes? DMFC: Problems and possible solutions

  12. PEMFC: Water balance in membrane e e H2 2H++2e Anode O2+4H++4e  2H2O Cathode H+ transport H2O H2 O2 H2O H2O diffusion D R Y W E T Electro-osmotic drag H+(H2O) H2O diffusion H2O H+ transport Water balance in polymer membrane.

  13. MEA組成示意圖

  14. Currently Used Proton ExchangeMembrane(PEM)-Nafion

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