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  • Enjoy Academy, Enjoy Life,

    Enjoy Tokyo

    张浩 Hao ZHANG Student No.:15R55020

    Home institution: Tsinghua University Academic advisor: Takeo Yamaguchi

    Chemical Resources Laboratory

    08/21/2015

  • Introduction PEMFC Water transport in PEMFC

     Diffusion water

     Electro- osmotic water

     Generated water

    Low humidity: fuel cell IR resistance will be too high. High humidity: flooding in catalyst layer(cathode).

    Fuel cell performance will decrease.

    Therefore, water management is very important.

  • 0

    0.2

    0.4

    0.6

    0.8

    1

    1.2

    0 0.1 0.2 0.3 0.4 0.5 0.6

    vo lta

    ge (V

    )

    current density(A/cm2)

    IV curve

    IR loss

    • Cathod:42%RH, 500cc/min • Anode: 15%RH, 100cc/min

    experiment result

    Numerical Simulation for Water Transport inside the Fuel Cell Membrane

    Assumption: • P is related with

    RH. • neo is not related

    with RH.

    0 0.2 0.4 0.6 0.8 1

    0 0.2 0.4 0.6 0.8

    1

    0 25 50

    re la

    tiv e

    hu m

    id ity

    the distance from anode/μm

    Simulation result of water distribution

    My purpose: Prove the simulation result of low humidity condition with experiment method.

  • Experimental Setup Anode:15%RH H2 100 [mL/min] O2 500 [mL/min]

    Cathode:42%RH I observed:

    Outlet RH (dew point)

    • Check water mass balance

    • Compare with simulation result

  • Confirmation of the Water Mass Balance

    generatedcathodeout,anodeout,

    cathodein,anodein,

    WWW WW

    −+=

    +

    Calculation

    The equation of water balance:

    Win,anode +Win,cathode

    Wout,anode +Wout,cathode-

    Wgenerated

    Water amount (mol/s) 7.4E-05 7.5E-05

    Therefore, water mass balance is achieved. 62.5oC

    39.3 oC 59.98 oC

    49.4oC

  • Coincidence Between Experiment and Simulation

    water distribution inside membrane

    0

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    1

    0

    0.2

    0.4

    0.6

    0.8

    1

    0 25 50

    Re la

    tiv e

    hu m

    id ity

    the distance from anode(μm) Cathode side

    Anode side

    • We should consider the relationship between neo and RH.

    Conclusion

    Experiment value

    Simulation value

    Current density: 0.54A/cm2

    • Low humidity condition will do harm to fuel cell performance.

    Simulation assumption: • P is related with RH. • neo is not related with RH.

    There is difference of RH in anode side between experiment and simulation result.

  • Experience in NIPPON!

    Shock 7 If you want your grandmother look more fashionable, I recommend you show her how Japanese old ladies dress themselves.

    Shock 6 Japanese people have two faces. One face is in office and the other face is in Izakaya(drinking house). They are just crazy.

  • Experience in NIPPON!

    Shock 10 When Japanese students tell you that their English is not good, just believe them. They are not modest, their English is really not so good.

    Shock 9 For girls: How to get close to Japanese boys? Ask them if they are interested in watching anime. And you had better know something about lovelive. For boys: How to get close to Japanese girls?

    Shock 8 Want to see the ideal Japanese girl in Japan? Just go to maid coffee. Remember take a photo them : )

  • Experience in NIPPON!

    Shock 1 I was prepared to take a holiday in Japan. But the reality is that I stay in lab and classroom all day long except weekends. But it is the most meaningful holiday that I have ever had.

  • Shock 5 Japanese toilet is really advanced.

    Shock 4 When staying in Japan I keep wondering why Japanese streets are so clean? Maybe it’s because there no trash can.

    Shock 3 The hanabi show is really terrific. It also shows how rich is Japanese government. And thanks for our scholarship.

    Shock2 : what’s the most beautiful place in Tokyo? I think it’s Yokuhama.

  • Acknowledge Professor Takeo Yamaguchi

    Assistant Professor Yuhei Oshiba

    Assistant Professor Hidenori Ohashi

    MD student Hiroto Okuyama

    Professor Hara and all staff for CAMPUS Asia

  • Thank you & 谢谢!

    2015.08.21

    スライド番号 1 Introduction Numerical Simulation for Water Transport inside the Fuel Cell Membrane Experimental Setup Confirmation of the Water Mass Balance Coincidence Between Experiment and Simulation Experience in NIPPON! Experience in NIPPON! Experience in NIPPON! スライド番号 10 Acknowledge スライド番号 12