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세라믹 예비텀발표

Joung Darae

on 19 December 2010

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Transcript of ceramic

A methanol solution is added to
the anode side of the cell Step 1. Step 2. The methanol solution separates into
protons (H+) and electrons (e-),
along with carbon dioxide (CO2) Step 3. The electrons (e-) are guided out of the fuel cell,
forming an electric current.
The current returns to the fuel cell cathode (air side) Step 4. Protons (H+) and electrons (e-) react with the air at the cathode to form humid air,
which is exhausted from the system Crossover current : methanol in high
concentrations has the tendency to diffuse
through the membrane to the cathode,
where its concentration is about zero
because it is rapidly consumed by oxygen 3. CO, reaction product, is poisoning the Pt. 4. Danger of methanol 2. Oxidation reaction rates are too slow in anode increasing quantity of catalyst in anode
→ cause of increasing cost, weigh Problms
with DMFC How a DMFC works? What is a DMFC? PEMFC Polymer Electrolyte Membrane Fuel Cell DMFC Direct Methanol Fuel Cells can be handled, stored
and transported similarly
to conventional liquid fuels. Design DMFC 1. Cross-over current Design Plan 1 It can reduce the price of DMFC with increasing Pt catalyst activities.
Pt is very expensive. So in order to reduce the price of DMFC,
we have to cut down amount of Pt used in DMFC. Miniature Pt particles (for reducing the cost) Increasing Oxygen Reduction Activity Design Plan 2 Pt catalyst is principal cause of cross-over because it's reactivity is excellent
with methanol. For increasing oxygen reaction activity, we'll add Fe, Co
and Ni to Pt. Then Pt don't react with methanol, but react with only oxygen. Through this method, we can lessen cross-over. (for control of the cross-over) References Presentation Efficiency Low Electrical Efficiencies Thank You
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