Sol–Gel Combustion-Derived CoCuMnOx Spinels as Pigment for Spectrally Selective Paints

Authors

  • Qing-Fen Geng,

    1. Center of Ecological and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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  • Xin Zhao,

    1. Center of Ecological and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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  • Xiang-Hu Gao,

    1. Center of Ecological and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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  • Gang Liu

    Corresponding author
    1. Center of Ecological and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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  • T. Vanderah—contributing editor

  • This study was supported by the Solar Power Action Plan of Chinese Academy of Sciences (Grant No. 1731012394).

†Author to whom correspondence should be addressed. e-mail: gangliu@licp.cas.cn

Abstract

In this work, sol–gel combustion synthesis of spinel CoCuMnOx was reported. X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) techniques were used to study the reaction processes. The as-synthesized spinel CoCuMnOx was further characterized by XRD, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy. The CoCuMnOx powders with a deep black hue were then used as solar energy-absorbing additive to make a novel kind of spectrally selective paint coatings. The solar absorptance (αs) and the thermal emittance (ɛT) of the coatings were determined from the corresponding diffuse reflectance spectra in the 0.3–20 μm range. The optimum selective sample exhibited values of αs=0.928 and ɛ100=0.198. Besides ideal optical properties, the coatings also show excellent long-term stability, which is confirmed by results of accelerated tests established by IEA-SHC Task X, indicating that they could be a good alternative to the materials present today in the market.

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