Oxidation-resistant, solution-processed plasmonic Ni nanochain-SiOx (x < 2) selective solar thermal absorbers

被引:14
作者
Yu, Xiaobai [1 ]
Wang, Xiaoxin [1 ]
Zhang, Qinglin [2 ]
Li, Juchuan [3 ]
Liu, Jifeng [1 ]
机构
[1] Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA
[2] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA
[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
基金
美国国家科学基金会;
关键词
MICRO-RAMAN SPECTROSCOPY; HYDROGEN SILSESQUIOXANE; NICKEL SILICIDES; HSQ FILMS; COATINGS; NANOPARTICLES; SILICON; XPS;
D O I
10.1063/1.4893656
中图分类号
O59 [应用物理学];
学科分类号
摘要
Metal oxidation at high temperatures has long been a challenge in cermet solar thermal absorbers, which impedes the development of atmospherically stable, high-temperature, high-performance concentrated solar power (CSP) systems. In this work, we demonstrate solution-processed Ni nanochain-SiOx (x < 2) and Ni nanochain-SiO2 selective solar thermal absorbers that exhibit a strong anti-oxidation behavior up to 600 degrees C in air. The thermal stability is far superior to previously reported Ni nanoparticle-Al2O3 selective solar thermal absorbers, which readily oxidize at 450 degrees C. The SiOx (x < 2) and SiO2 matrices are derived from hydrogen silsesquioxane and tetraethyl orthosilicate precursors, respectively, which comprise Si-O cage-like structures and Si-O networks. Fourier transform infrared spectroscopy shows that the dissociation of Si-O cage-like structures and Si-O networks at high temperatures have enabled the formation of new bonds at the Ni/SiOx interface to passivate the surface of Ni nanoparticles and prevent oxidation. X-ray photoelectron spectroscopy and Raman spectroscopy demonstrate that the excess Si in the SiOx (x < 2) matrices reacts with Ni nanostructures to form silicides at the interfaces, which further improves the anti-oxidation properties. As a result, Ni-SiOx (x < 2) systems demonstrate better anti-oxidation performance than Ni-SiO2 systems. This oxidation-resistant Ni nanochain-SiOx (x < 2) cermet coating also exhibits excellent high-temperature optical performance, with a high solar absorptance of similar to 90% and a low emittance similar to 18% measured at 300 degrees C. These results open the door towards atmospheric stable, high temperature, high-performance solar selective absorber coatings processed by low-cost solution-chemical methods for future generations of CSP systems. (C) 2014 AIP Publishing LLC.
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页数:8
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