Polymer-based Thermoelectric Devices
THOT
To Load
To Load
TCOLD
Stuart W. A. Hilsmier, Edward P. Tomlinson,
and Bryan W. Boudouris
School of Chemical Engineering
Purdue University
Thursday August 7, 2014
Need for Waste Energy Recovery
1.
2.
3.
4.
Introduction (1 of 4)
Methods
(2)
Results
(1)
Conclusion (1)
Source: Lawrence Livermore National Laboratory (www.llnl.gov)
Fundamentals of Thermoelectric Materials
THOT
To Load
To Load
𝜎𝑆 2
𝑧𝑇 =
𝑇
𝜅
TCOLD
Material Figure of Merit (zT)
Parameters
Used to compare efficiency of Electrical Conductivity (σ): Measure of the ability for
electrons to move through the material
materials
Seebeck Coefficient (S): Measures the amount of
energy an electron carries across the material
1.
2.
3.
4.
Introduction (2 of 4)
Methods
(2)
Results
(1)
Conclusion (1)
Thermal Conductivity (κ): Measures how easily heat can
move through the material
Uses of Thermoelectric Devices
Reliable
Reduce Weight
1.
2.
3.
4.
Introduction (3 of 4)
Methods
(2)
Results
(1)
Conclusion (1)
Improve efficiency
Organic Molecules in Thermoelectric Device
Poly(2,2,6,6-tetramethyl-1-piperidinyloxy-4-yl methacrylate)
 PTMA
Testing films doped with 4-ethylbenzenesulfonic acid
 EBSA
• PTMA previously used in solid-state[3]
• Has well-documented conductivity[1-2]
• Question: What effects will doping PTMA with
EBSA have on its conductivity, Seebeck
coefficient, and thermoelectric power factor?
1.
2.
3.
4.
Introduction (4 of 4)
Methods
(2)
Results
(1)
Conclusion (1)
From Solution to Device
Prepare solution
• Mass compounds
• Add solvent
Apply solution
to substrate
• Stir until dissolved
Paint silver contacts on
1.
2.
3.
4.
Introduction (4)
Methods
(1 of 2)
Results
(1)
Conclusion (1)
Heat to evaporate solvent
Conductivity and Seebeck Testing
Current
ΔT
40˚C
Voltage
Voltage
THot
1.
2.
3.
4.
Introduction (4)
Methods
(2 of 2)
Results
(1)
Conclusion (1)
TCold
Results
Mass Percent EBSA vs Conductivity
1.
2.
3.
4.
Introduction (4)
Methods
(2)
Results
(1 of 1)
Conclusion (1)
Conclusions and Future Work
• Conductivity increases with larger mass percent of EBSA
• Seebeck data necessary to determine power factor of devices
Percent EBSA vs Seebeck and Power Factor
(Example Data)
1.
2.
3.
4.
Introduction (4)
Methods
(2)
Results
(1)
Conclusion (1 of 1)
References
1. Rostro, L.; Baradwaj, A. G.; Boudouris, B. W. ACS Appl. Mater. Interfaces 2013, 5,
9896–9901.
2. Rostro, L.; Wong, S. H.; Boudouris, B. W. Macromolecules 2014, 47, 3713–3719.
3. Yonekuta, Y.; Susuki, K.; Oyaizu, K.; Honda, K.; Nishide, H. J. Am. Chem. Soc.
2007, 129, 14128–14129.
Acknowledgements