Electrochromic metal hydrides

Current Opinion in Solid State and Materials Science

Volumn 4, Issue 1, 1999, Pages 5-10

  Notten, Peter H L ^a  

^a PHILIPS RESEARCH LABORATORIES   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0002088541     PISSN: 13590286     EISSN: None     Source Type: Journal    
DOI: 10.1016/S1359-0286(99)80004-7     Document Type: Article

References (31)

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16. Notten PHL, Kremers M, Griessen R: Optical switching of Y-hydride thin film electrodes: a remarkable electrochromic phenomenon. J Electrochem Soc 1996, 143:3348-3353.
17. Van der Sluis P: Optical switching of gadolinium-magnesium multilayers. Appl Phys Lett 1998, 73:1826-1828.
18. den Broeder FJA, van der Molen SJ, Kremers M, Huiberts JN, Nagengast DG, van Gogh ATM, Huisman WH, Koeman NJ, Dam B, Rector JH et al.: Visual study of hydrogen migration using switchable mirrors. Nature 1998, 394:656-658. Elegant optical experiments to investigate the hydrogen transport properties inside thin Y-films have been designed by den Broeder. Small Pd structures, partly covering Y-films, act as catalytic gates of hydrogen gas, through which lateral transport led to fabulous microscopic structures. These structures, each having a typical optical appearance, are correlated to the various distinguished Y-hydride phases. By applying a voltage across the Y films evidence could be obtained that hydrogen in the trihydride phase has a negative valence.
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26. Kremers M, Koeman NJ, Griessen R, Notten PHL, Tolboom R, Kelly PJ, Duine P: Optical transmission spectroscopy of switchable yttrium hydride films. Phys Rev B 1998, 57:4943-4949. In situ optical measurements were conducted during the electrochemical (de)hydrogenation. The wavelength resolved electrode transmission has been revealed as a function of the hydrogen content. The dihydride phase was found to be characterised by a small transmission window at high energy wavelengths. The influence of the Pd top layer on the optical film properties has been derived by investigating the optical properties as a function of the Pd layer thickness.
27. Von Rottkay K, Rubin M, Duine PA: Refractive index changes of Pd-coated magnesium lanthanide switchable mirrors upon hydrogen insertion. J Appl Phys 1999, in press.
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30. 0.6 alloys revealed a colour neutral transparency when electrochemically loaded towards the trihydride composition. Remarkably, a 200 nm thick layer can be switched over four orders of density in optical transmission.
31. Van der Sluis P: Chemochromic optical switches based on metal hydrides. Electrochim Acta 1999, in press.