Mg-Ti-H thin films as switchable solar absorbers

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Mg-Ti-H thin films as switchable solar absorbers

Journal Article (2008)

Author(s)

A. Baldi (Vrije Universiteit Amsterdam)

D. M. Borsa (Vrije Universiteit Amsterdam)

H. Schreuders (Vrije Universiteit Amsterdam)

J. H. Rector (Vrije Universiteit Amsterdam)

T. Atmakidis (Technische Universität Dortmund)

M. Bakker (ECN Solar Energy)

H. A. Zondag (ECN Solar Energy)

W. G.J. van Helden (ECN Solar Energy)

B. Dam (Vrije Universiteit Amsterdam)

R. Griessen (Vrije Universiteit Amsterdam)

Affiliation

External organisation

Hydrogen switchable mirrors Solar absorptance Solar collectors Thermal emittance

DOI related publication

https://doi.org/10.1016/j.ijhydene.2008.01.026 Final published version

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More Info

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Publication Year

2008

Language

English

Affiliation

External organisation

Journal title

International Journal of Hydrogen Energy

Issue number

12

Volume number

33

Pages (from-to)

3188-3192

Downloads counter

152

Abstract

The reflection and transmission spectra of Pd capped Mgy Ti1 - y thin films (y = 0.7, 0.8 and 0.9) are measured in the 0.5-5.5 eV energy range, both in the as-prepared and hydrogenated states. Upon hydrogenation these films switch reversibly from a shiny metallic state into a "black" absorbing one. The composition and thicknesses can be tailored to achieve high solar absorptance and low thermal emittance in the hydrogenated state. The combination of these two characteristics is interesting for the application of this material as switchable absorber in solar collectors. The use of a Mgy Ti1 - y switchable absorber in solar collectors allows to lower the stagnation temperature from 180 to 80 °C. The collector efficiency is affected only minimally.