Journal
LANGMUIR
Volume 33, Issue 31, Pages 7600-7605Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.7b00746
Keywords
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Funding
- National Natural Science Foundation of China [51373197, 21422407]
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An intriguing p-n conversion of thermoelectric property was observed in a water ionic liquid ([EMIm][Ac]) binary system with precise control over water content. The highest p-type and n-type Seebeck coefficient were optimized at water [EMIm] [Ac] molar ratio of 2:1 and 4:1, respectively. DFT calculation illustrates that a configuration of solvent separation ion pairs is preferred at the water [EMIm][Ac] molar ratio of 4:1, leading to the p-n conversion through weakening, interaction between anion clusters and gold electrodes. Furthermore, p-n thermocapacitive converters were integrated to enhance the output Seebeck voltages. This work opens up new perspectives for harvesting low grade heat with the use of fluidic materials.
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