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Fabrication of Self‐Cleaning CNT‐Based Near‐Perfect Solar Absorber Coating for Non‐Evacuated Concentrated Solar Power Applications
Author(s) -
Bera Raj Kumar,
Binyamin Yaniv,
Frantz Cathy,
Uhlig Ralf,
Magdassi Shlomo,
Mandler Daniel
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000699
Subject(s) - materials science , coating , carbon nanotube , absorptance , selective surface , thermal emittance , solar energy , fabrication , concentrated solar power , composite material , optics , optoelectronics , reflectivity , medicine , ecology , beam (structure) , physics , alternative medicine , pathology , biology
A near‐perfect black solar absorber made of carbon nanotubes (CNTs) prepared by a low‐cost wet‐deposition method on a reflective metal surface for mid‐temperature non‐evacuated concentrated solar power (CSP) applications is demonstrated. The dispersed CNTs in an alumina–silica matrix exhibit an absorptance of 0.985 in the entire solar spectrum and emittance of 0.90 in the infrared (IR) region. The coating shows high durability and is super‐hydrophilic (0° contact angle) after plasma treatment, without affecting the solar absorptance and excellent coating adhesion. The efficiency of the coating is evaluated by analytical models, which implies that it has higher efficiency at low temperature and at a high solar concentration ratio than that of previously reported selective coatings.