Highly Selective Solar Thermal Sprayable Coating Based on Carbon Nanotubes

Raj Kumar Bera, Yaniv Binyamin, Subodh G. Mhaisalkar, Shlomo Magdassi, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A key component in solar thermal energy conversion system is the light collector that is coated with an absorbing material. Optimal performance is accomplished by high absorptance and low emittance. The best collectors are fabricated by vacuum deposition processes, which are limited to small size and flat objects. Here, the formation and performance of a new three-layer solar selective coating, which is formed by a simple wet-deposition process is reported. The solar absorbing layer is based on carbon nanotubes, which are considered the most absorbing material. This layer is coated by a second layer of ITO, which functions as an IR reflecting layer, followed by an AlOOH anti-reflective layer. The resulting CNT/ITO/AlOOH coating exhibited the best-reported spectral selectivity by wet deposition process, with high absorptance of 0.941 ± 0.004 and low emittance of 0.13 ± 0.02 at room temperature. Furthermore, the multilayer sprayable coating is stable at elevated temperature for a prolong time and therefore, shows promise for application in large scale and on-site solar thermal facilities.

Original languageAmerican English
Article number1700080
JournalSolar RRL
Volume1
Issue number9
DOIs
StatePublished - 1 Sep 2017

Bibliographical note

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • carbon nanotubes
  • selective coatings
  • solar thermal
  • wet-deposition

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