polymer-based thermoelectrics
DESCRIPTION
presentation on organic thermoelectricsTRANSCRIPT
Polymer-based Thermoelectric Devices
School of Chemical EngineeringPurdue UniversityThursday August 7, 2014
Stuart W. A. Hilsmier, Edward P. Tomlinson, and Bryan W. Boudouris
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Need for Waste Energy Recovery
Source: Lawrence Livermore National Laboratory (www.llnl.gov)1. Introduction (1 of 4)2. Methods (2)3. Results (1)4. Conclusion (1)
Fundamentals of Thermoelectric Materials
𝑧𝑇=𝜎𝑆2𝜅 𝑇
Used to compare efficiency of materials
Parameters
Seebeck Coefficient (S): Measures the amount of energy an electron carries across the material
Electrical Conductivity (σ): Measure of the ability for electrons to move through the material
Thermal Conductivity (κ): Measures how easily heat can move through the material
Material Figure of Merit (zT)
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1. Introduction (2 of 4)2. Methods (2)3. Results (1)4. Conclusion (1)
Uses of Thermoelectric Devices
Reduce Weight
Improve efficiency
Reliable
1. Introduction (3 of 4)2. Methods (2)3. Results (1)4. Conclusion (1)
Organic Molecules in Thermoelectric Device
Poly(2,2,6,6-tetramethyl-1-piperidinyloxy-4-yl methacrylate) PTMA
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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. Introduction (4 of 4)2. Methods (2)3. Results (1)4. Conclusion (1)
From Solution to Device
Prepare solution• Mass compounds
• Add solvent
• Stir until dissolved
Heat to evaporate solvent
Paint silver contacts on
Apply solution to substrate
1. Introduction (4)2. Methods (1 of 2)3. Results (1)4. Conclusion (1)
Conductivity and Seebeck Testing
Current
Voltage
40˚C
Voltage
ΔT
THot TCold
1. Introduction (4)2. Methods (2 of 2)3. Results (1)4. Conclusion (1)
Results
1. Introduction (4)2. Methods (2)3. Results (1 of 1)4. Conclusion (1)
Mass Percent EBSA vs Conductivity
Conclusions and Future Work
1. Introduction (4)2. Methods (2)3. Results (1)4. Conclusion (1 of 1)
• 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)
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