TY - JOUR
T1 - Self-Healable and Stretchable Ionic-Liquid-Based Thermoelectric Composites with High Ionic Seebeck Coefficient
AU - Akbar, Zico Alaia
AU - Malik, Yoga Trianzar
AU - Kim, Dong Hu
AU - Cho, Sangho
AU - Jang, Sung Yeon
AU - Jeon, Ju Won
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/4/27
Y1 - 2022/4/27
N2 - The advancement of wearable electronics, particularly self-powered wearable electronic devices, necessitates the development of efficient energy conversion technologies with flexible mechanical properties. Recently, ionic thermoelectric (TE) materials have attracted great attention because of their enormous thermopower, which can operate capacitors or supercapacitors by harvesting low-grade heat. This study presents self-healable, stretchable, and flexible ionic TE composites comprising an ionic liquid (IL), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMIM:OTf); a polymer matrix, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP); and a fluoro-surfactant (FS). The self-healability of the IL-based composites originates from dynamic ion–dipole interactions between the IL, the PVDF-HFP, and the FS. The composites demonstrate excellent ionic TE properties with an ionic Seebeck coefficient (Si) of ≈38.3 mV K−1 and an ionic figure of merit of ZTi = 2.34 at 90% relative humidity, which are higher than the values reported for other IL-based TE materials. The IL-based ionic TE composites developed in this study can maintain excellent ionic TE properties under harsh conditions, including severe strain (75%) and multiple cutting–healing cycles.
AB - The advancement of wearable electronics, particularly self-powered wearable electronic devices, necessitates the development of efficient energy conversion technologies with flexible mechanical properties. Recently, ionic thermoelectric (TE) materials have attracted great attention because of their enormous thermopower, which can operate capacitors or supercapacitors by harvesting low-grade heat. This study presents self-healable, stretchable, and flexible ionic TE composites comprising an ionic liquid (IL), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMIM:OTf); a polymer matrix, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP); and a fluoro-surfactant (FS). The self-healability of the IL-based composites originates from dynamic ion–dipole interactions between the IL, the PVDF-HFP, and the FS. The composites demonstrate excellent ionic TE properties with an ionic Seebeck coefficient (Si) of ≈38.3 mV K−1 and an ionic figure of merit of ZTi = 2.34 at 90% relative humidity, which are higher than the values reported for other IL-based TE materials. The IL-based ionic TE composites developed in this study can maintain excellent ionic TE properties under harsh conditions, including severe strain (75%) and multiple cutting–healing cycles.
KW - ionic liquid-based composites
KW - ionic thermoelectrics
KW - self-healing materials
KW - stretchable composites
UR - http://www.scopus.com/inward/record.url?scp=85127288038&partnerID=8YFLogxK
U2 - 10.1002/smll.202106937
DO - 10.1002/smll.202106937
M3 - Article
C2 - 35344267
AN - SCOPUS:85127288038
SN - 1613-6810
VL - 18
JO - Small
JF - Small
IS - 17
M1 - 2106937
ER -