Compositionally Graded Organic–Inorganic Nanocomposites for Enhanced Thermoelectric Performance


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Abstract

jats:titleAbstract</jats:title>jats:pThermoelectric generators (TEGs) operate in the presence of a temperature gradient, where the constituent thermoelectric (TE) material converts heat into electricity via the Seebeck effect. However, TE materials are characterized by a thermoelectric figure of merit (jats:italicZT</jats:italic>) and/or power factor (PF), which often has a strong dependence on temperature. Thus, a single TE material spanning a given temperature range is unlikely to have an optimal jats:italicZT</jats:italic> or PF across the entire range, leading to inefficient TEG performance. Compositionally graded organic–inorganic nanocomposites are demonstrated, where the composition of the TE nanocomposite can be systematically tuned along the length of the TEG, in order to optimize the PF along the applied temperature gradient. The nanocomposite composition is dynamically tuned by an aerosol‐jet printing method with controlled in situ mixing capability, thus enabling the realization of such compositionally graded thermoelectric composites (CG‐TECs). It is shown how CG‐TECs can be realized by varying the loading weight percentage of Bijats:sub2</jats:sub>Tejats:sub3</jats:sub> nanoparticles or Sbjats:sub2</jats:sub>Tejats:sub3</jats:sub> nanoflakes within an organic conducting matrix using bespoke solution‐processable inks. The enhanced energy harvesting capability of these CG‐TECs from low‐grade waste heat (<100 °C) is demonstrated, highlighting the improvement in output power over single‐component TEGs.</jats:p>

Description
Keywords
aerosol-jet printing, nanocomposites, thermal energy harvesting, thermoelectrics
Journal Title
Advanced Electronic Materials
Conference Name
Journal ISSN
2199-160X
2199-160X
Volume Title
6
Publisher
Wiley
Rights
All rights reserved
Sponsorship
European Research Council (639526)
Engineering and Physical Sciences Research Council (EP/P007767/1)