TY - JOUR
AU - Liu, Jifeng
AB - Abstract: High-temperature Cu-Mn-Fe spinel-oxide nanoparticle solar selective absorber coatings are investigated experimentally and theoretically. A reliable, general approach to evaluate absorption coefficient spectra from the optical measurements of the nanoparticle-pigmented coatings is developed based on solving the inverse problem using four-flux-radiative method. The derived absorption properties of NP materials can be directly applied to predict the solar absorptance, optimize the nanoparticle-pigmented coatings, and analyze the thermal degradation, which agree well with the experimental results. The analysis reveals that the Cu-Mn-Fe spinel oxides are fundamentally indirect bandgap ranging from 1.7 to 2.1 eV, while iron-free CuMn2O4 is a direct bandgap material with Eg=1.84 eV. With the same coating thickness and nanoparticle load, the solar absorptance ranks in the order of Mn2O3 < MnFe2O4 < CuFe2O4 < CuFeMnO4 < CuMn2O4. The optimized spray-coated iron-free CuMn2O4 NP-pigmented coating demonstrates a high solar absorptance of 97%, a low emittance of 55%, a high optical-to-thermal energy conversion efficiency of ~93.5 % under 1000x solar concentration at 750 degrees C, and long-term endurance upon thermal cycling between 750°C and room temperature in air. The optical parameter analysis approach can be easily extended to other material systems to facilitate the searching and optimizing high-temperature pigmented-solar selective coatings.
TI - Extracting optical parameters of Cu-Mn-Fe spinel oxide nanoparticles for optimizing air-stable, high-efficiency solar selective coatings
JF - Condensed Matter
DO - 10.48550/arXiv.2301.01194
DA - 2023-01-03
UR - https://www.deepdyve.com/lp/arxiv-cornell-university/extracting-optical-parameters-of-cu-mn-fe-spinel-oxide-nanoparticles-CUdCHBYRvM
VL - 2023
IS - 2301
DP - DeepDyve
ER -