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Enhanced thermal conductivity of phase change material nanocomposites based on MnO2 nanowires and nanotubes for energy storage.

Authors :
Liang, Weidong
Wang, Lina
Zhu, Hongyu
Pan, Yu
Zhu, Zhaoqi
Sun, Hanxue
Ma, Chonghua
Li, An
Source :
Solar Energy Materials & Solar Cells. Jun2018, Vol. 180, p158-167. 10p.
Publication Year :
2018

Abstract

Phase change materials (PCMs) have been widely used as efficient materials in latent heat thermal storage systems for various applications. The poor thermal conductivity of most organic phase change materials (OPCMs), however, has long been considered as one of big obstacles hindering their practical applications. Here, we report the first examples of Manganese dioxide nanowires and nanotubes based PCM nanocomposites (named as MnO 2 NWs/PCM and MnO 2 NTs/PCM) with enhanced thermal conductivity by simply using MnO 2 nanowires and nanotubes as efficient nanofillers. The PCMs nanocomposites show high latent heat ranging from 140.1 J g −1 to 206.1 J g −1 . The thermal conductivity of PCM nanocomposites were dramatically enhanced by incorporation of Manganese dioxide nanowires and nanotubes with a maximum value of 377.16% of that of pure PA achieved, which is nearly two times of that of control. X-ray diffraction (XRD) analysis shows that the incorporation of nanofillers does not change the crystalline structure of OPCMs while lowering its crystalline size. The PCM nanocomposites also show excellent thermal stability of recyclability. Only a slight loss of 2.8% in latent heat was observed after 100 times of melting/cooling cycles. Based on their high heat storage performance, excellent thermal conductivity and thermal stability of recyclability, the as-prepared PCM nanocomposites may have great potentials for energy saving applications. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09270248
Volume :
180
Database :
Academic Search Index
Journal :
Solar Energy Materials & Solar Cells
Publication Type :
Academic Journal
Accession number :
128671239
Full Text :
https://doi.org/10.1016/j.solmat.2018.03.005