Electrochromism of Mg-Ni hydride switchable mirrors

Jan Isidorsson; I. A. M. E. Giebels; M. Di Vece; Ronald Griessen

doi:10.1117/12.448240

13 November 2001 Electrochromism of Mg-Ni hydride switchable mirrors

Jan Isidorsson, I. A. M. E. Giebels, M. Di Vece, Ronald Griessen

Proceedings Volume 4458, Solar and Switching Materials; (2001) https://doi.org/10.1117/12.448240
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Switchable mirrors have so far been made of rare-earth and rare-earth-magnesium based metal-hydrides. In this investigation we study Mg-Ni-hydrides, which have been shown by Richardson et al. to exhibit switchable properties similar to those of the rare-earth hydrides. Cyclic voltammetry on Mg_zNiH_x samples with 0.8 less than z less than 3.7 shows that addition of one Mg atom per Mg₂Ni gives the best ab/desorption kinetics for hydrogen. X- ray diffraction reveals a structural change as hydrogen is absorbed. The metal-insulator transition is confirmed with simultaneous resistivity measurements. A pressure- composition isotherm of Mg₂NiH_x is also determined electrochemically. Optical spectrometry during gas loading gives an optical band gap of 1.6 eV for Mg₂NiH₄. This gap increases with increasing Mg content in a way similar to that of the Mg-doped rare-earth hydrides.

Citation Download Citation

Jan Isidorsson, I. A. M. E. Giebels, M. Di Vece, and Ronald Griessen "Electrochromism of Mg-Ni hydride switchable mirrors", Proc. SPIE 4458, Solar and Switching Materials, (13 November 2001); https://doi.org/10.1117/12.448240

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