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Title: A high-performance spectrally-selective solar absorber based on a yttria-stabilized zirconia cermet with high-temperature stability

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/C5EE02066B· OSTI ID:1387052
 [1];  [2];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Univ. of Houston, TX (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Spectrally-selective solar absorbers are widely used in solar hot water and concentrating solar power (CSP) systems. However, their performance at high temperatures (>450 °C) is still not satisfactory due to high infrared (IR) emittance and lack of long-term thermal stability. In this work, we explore yttria-stabilized zirconia (YSZ) cermet-based spectrally-selective surfaces for high-temperature solar absorber applications. The developed multilayer selective surface comprises two sunlight-absorbing W–Ni–YSZ cermet layers with different W–Ni volume fractions inside the YSZ matrix, two anti-reflection coatings (ARCs), and one tungsten IR reflection layer for reduced IR emittance and improved thermal stability, deposited on a polished stainless steel (SS) substrate. The fabricated solar absorbers are tested for their long-term thermal stability at 600 °C. We find a distinct change in the surface morphology of the solar absorbers when oxygen is highly deficient in the YSZ-ARC layers. The oxygen deficiency can be effectively overcome through increasing the oxygen partial pressure during sputtering, which leads to a stable solar absorber with a solar absorptance of ~0.91 and a total hemispherical emittance of ~0.13 at 500 °C. Those values are obtained at the actual operating temperature using an absolute and direct method that measures the total hemispherical emittance with high accuracy. In contrast, most reports on solar absorber development in the literature to date use only near room-temperature spectroscopy techniques that have been shown to significantly underestimate the total hemispherical emittance. This makes our experimentally demonstrated total hemispherical emittance value the lowest ever reported for a high-temperature stable solar absorber with solar absorptance above 0.9.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Robert A. Welch Foundation
Grant/Contract Number:
SC0001299; FG02-09ER46577; EE0005806; ECCS-1240510; E-1728
OSTI ID:
1387052
Journal Information:
Energy & Environmental Science, Vol. 8, Issue 10; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 83 works
Citation information provided by
Web of Science

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Tungsten-Carbon Nanotube Composite Photonic Crystals as Thermally Stable Spectral-Selective Absorbers and Emitters for Thermophotovoltaics journal August 2018
Efficient, Scalable, and High-Temperature Selective Solar Absorbers Based on Hybrid-Strategy Plasmonic Metamaterials journal May 2018
An Ultrathin, Nanogradient, and Substrate‐Independent WO x ‐Based Film as a High Performance Flexible Solar Absorber journal July 2019
Selective light absorber-assisted single nickel atom catalysts for ambient sunlight-driven CO2 methanation journal May 2019
Semiconductor-based Multilayer Selective Solar Absorber for Unconcentrated Solar Thermal Energy Conversion journal July 2017
Metamaterial emitter for thermophotovoltaics stable up to 1400 °C journal May 2019
Self-doped W–WO x nanocermet multilayer films fabricated by single tungsten target reactive sputtering for selective solar absorption journal January 2018
Design and optimization of nanoparticle-pigmented solar selective absorber coatings for high-temperature concentrating solar thermal systems journal January 2018
High-temperature stable refractory nanoneedles with over 99% solar absorptance journal March 2019