Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 14, Issue 12, Pages 6586-6594Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ee02552j
Keywords
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Funding
- International Cooperation Project of Ministry of Science and Technology of China [2017YFE0107800]
- National Natural Science Foundation of China [91963208, 52072391, 51625205, 52172255, 51961135106, 52122213]
- Shanghai government [20JC1415100]
- Shanghai Rising-Star Program [19QA1410200]
- Instrument Developing Project of Chinese Academy of Sciences [ZDKYYQ20180004]
- Shanghai Sailing Program [20YF1455600]
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In this study, high-performance n-type organic-inorganic flexible thermoelectric composites were successfully fabricated using semiconducting graphdiyne (GDY) instead of carbon nanotubes or graphene. The composites showed improved electrical conductivity and achieved a maximum ZT value of 0.2 at 300 K, making them among the highest reported in this field. Additionally, a prototype thermoelectric module consisting of both n-type and p-type legs demonstrated the highest normalized maximum power density compared to other organic material-based flexible thermoelectric modules.
In the past decade, the development of high-performance p-type flexible organic-inorganic thermoelectric composites based on nanocarbons (e.g., carbon nanotubes and graphene) has achieved unprecedented success, but progress in the n-type counterpart lags far behind because carbon nanotubes and graphene usually demonstrate p-type behavior. In this work, beyond carbon nanotubes and graphene, we conduct a proof-of-principle study using semiconducting graphdiyne (GDY) to fabricate high-performance n-type organic-inorganic flexible thermoelectric composites. Based on the chemical interactions between GDY and the quasi-one-dimensional semiconductor Ta4SiTe4, we successfully fabricate n-type Ta4SiTe4/polyvinylidene fluoride (PVDF)/GDY composite films. GDY is homogeneously distributed inside the composites, acting as bridges among the Ta4SiTe4 whiskers to significantly improve the electrical conductivity. Combining the well-maintained large Seebeck coefficient and low thermal conductivity, the Ta4SiTe4/PVDF/GDY composite films demonstrate a maximum ZT value of 0.2 at 300 K, among the highest reported in organic-inorganic flexible thermoelectric composites. The protype thermoelectric module that consists of n-type Ta4SiTe4/PVDF/GDY legs and p-type PEDOT:PSS/CNT legs shows the highest normalized maximum power density among the reported organic material-based flexible thermoelectric modules including both n- and p-type legs.
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