sevda akay. eia sunum · microsoft powerpoint - sevda akay. eia sunum author: enica created date:...
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Sevda AkaySevda Akay
Fatih University, Istanbul,TURKEY
Proton Conductivity Studies of Novel OrganicProton Conductivity Studies of Novel OrganicPolymerPolymer
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Content
Fuel Cells
Proton Exchange Membrane
Benzimidazole Nitronyl Nitroxides
Synthesis of Novel Organic Polymer (SBNN1)
Electrochemical Impedance Analysis of SBNN1
Conclusions
Acknowledgement
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Fuel CellsCells
http://www.carblogindia.com/wpcontent/uploads/2011/02/fuelcell_thumb.jpg
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What is function of protonexchange membrane (PEM) infuel cells?
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Benzimidazole Nitronyl Nitroxides
-Analogues of nitronyl nitroxide radicals (NNs)-Highly resonance stabilized radicals (two equivalent NO groups and oflarge negative charges on O atom)-High spin density
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Proton Conductivity Mechanismof SBNN1
N
N
O
O
O
H
H+
N
N
O
O
O
H
N
N
O
O
O
H ...
......
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Thermal Stability of SBNN1
0 100 200 300 400 500 600 700 800
20
30
40
50
60
70
80
90
100
110
We
igh
t(%
)
Temperature (oC)
Commercial PolymerSBNN1
Purchased aldehyde hasbeen found to retain 100% of the mass up to about250 oC. It was observed tolose 5 % of its mass at 340oC, about 62 % at 500 oC,
SBNN is stable up to 150°C, it has lost some massgradually from beginningof 100 °C. It only lost 5%of its mass upto 240oCwhic is mostly associatedwith absorbed water.
The mass loss becamemore pronounced after400 oC. This polymer lost51 % of its mass at 500oC.
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Impedance MeasurementsComparison between Nafion and SBNN1
0 1 2 30,0
0,5
1,0
1,5
-Z
''/M
Z' /M
SBNN1, N2
Nafion,N2
0 100 200 300 400 5000
100
200
Z' /M
SBNN1
Nafion
air
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Measurements in hydrogenMeasurements of SBNN1 in dry H2 show that the materialSBNN1 has proton conductivity, which increases with theincrease of the gas flow
0 250 500 7500
150
300
40% H2
Z' / M
25% H230% H2
SBNN1, dry H2, room tCo
Impedance diagram of sample SBNN1 in dry hydrogen at room temperature as a function of theflow:
64 µl/min (○); 48 µl/min (○) , 40 µl/min (○)
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demonstrate the existence of protonconductivity in SBNN1.
0 200 400 600 800 10000
100
200
300
400
500
Z' /M
air SBNN1N2
48l/min,dry H2
Impedance diagram of sample Bu1 in different gases:air (○); N2 (▲) and dry H2 (◊)
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Conclusion
• The results obtained by impedance spectroscopymeasurements of SBNN1 show that the material hasproton conductivity. It is much lower than the onemeasured on Nafion samples prepared by the sametechnological procedure.
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Acknowledgements
• Prof. Dr. Zdravko Stoynov
• Prof. Dr. Daria Vladikova
• Assoc. Prof. Dr. Burak Esat
• Dr. Emiliya Mladenova
• Ivaylo Genov
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Thank you for listeningThank you for listening……
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Synthesis of Novel Organic Polymer(SBNN1)