Ms. Xiaobai Yu Profile

Xiaobai Yu

at Thayer School of Engineering at Dartmouth

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Proceedings Article | 7 October 2014 Paper

Anti-oxidation high-performance solution-processed Ni plasmonic nanochain-SiOx selective solar thermal absorbers

Xiaobai Yu, Xiaoxin Wang, Qinglin Zhang, Jifeng Liu

Proceedings Volume 9175, 91750L (2014) https://doi.org/10.1117/12.2059049

KEYWORDS: Nickel, Silicon, Solar thermal energy, Annealing, Plasmonics, Metals, FT-IR spectroscopy, Coating, Thermography, Oxidation

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In order to address the metal oxidation issue in cermet solar thermal absorbers at high working temperatures, we developed solution-processed plasmonic Ni nanochain-SiO_x (x≤2) selective solar thermal absorbers that exhibit high solar absorption, low thermal emittance, and strong anti-oxidation behavior up to 600 °C in air. The thermal stability is far superior to more conventional Ni nanoparticle-Al₂O₃ selective solar thermal absorbers, which readily oxidize at 450 °C. Ni nanochains were embedded in SiO_x and SiO₂ matrices which are derived from hydrogen silsesquioxane (HSQ) and tetraethyl orthosilicate (TEOS) precursors, respectively. Fourier transform infrared spectroscopy (FTIR) shows that the dissociation of Si-O cage-like structures into Si-O networks helped to retard the oxidation process of Ni, possibly by facilitating the formation of chemical bonding between Si in the matrix and the Ni nanochains. X-ray photoelectron spectroscopy (XPS) further shows that the excess Si from the dissociation of HSQ formed silicide-like chemical bonds with Ni that are robust to high temperature oxidation and protect the Ni nanostructures. Besides, the Ni-SiO_x system showed 90% solar absorptance and a low thermal emissivity of 20% at 300 °C in air, compared to ~30% emittance of conventional coating at the same temperature. This technology helps to eliminate the problem of vacuum breaching and further reduces the fabrication cost of the solar selective coating. With a high solar absorptance, a low thermal emittance in the infrared region, and excellent anti-oxidation property, this type of selective solar thermal absorber is promising for applications in future generations of CSP systems.

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