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Issue 7, 2019
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Nickel nanoparticles individually encapsulated in densified ceramic shells for thermally stable solar energy absorption

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Abstract

While non-noble transition metal nanoparticles are widely explored in the field of solar energy harvesting and conversion at high temperatures, their high tendency to diffuse and oxidize may cause a substantially reduced lifetime of devices. To address this issue, herein, we demonstrate that Ni nanoparticles individually encapsulated in a densified ceramic shell, achieved by a SiO2 coating and a subsequent densification process, possess significantly enhanced stability at high temperatures. Ni diffusion is effectively prevented at temperatures as high as 800 °C, and the oxidation of the Ni nanoparticles is suppressed at 500 °C when exposed to air. A spectrally selective absorbing film fabricated with these densified Ni@SiO2 NPs exhibits high optical absorption with reflectance <20% in the main solar radiation region, superior to that of semiconductor Si-based solar absorbing films. It also exhibits high thermal stability at 500 °C in air, a temperature at which thermal degradation begins for most selective solar absorbers with high-melting-point metals and metal nitrides. The Ni@SiO2 absorbing film developed in this work outperforms state-of-the-art high-temperature solar absorbers, suggesting its applicability in high-temperature solar-thermal conversion systems.

Graphical abstract: Nickel nanoparticles individually encapsulated in densified ceramic shells for thermally stable solar energy absorption

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Article information


Submitted
06 Nov 2018
Accepted
12 Dec 2018
First published
12 Dec 2018

J. Mater. Chem. A, 2019,7, 3039-3045
Article type
Paper

Nickel nanoparticles individually encapsulated in densified ceramic shells for thermally stable solar energy absorption

D. Ding, K. Liu, Q. Fan, B. Dong, Y. Zhang, Y. Yin, C. Gao and S. Ding, J. Mater. Chem. A, 2019, 7, 3039
DOI: 10.1039/C8TA10690H

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