Microchip power compensated calorimetry applied to metal hydride characterization

A. Sepúlveda, A. F. Lopeandía, R. Domènech-Ferrer, G. Garcia, F. Pi, J. Rodríguez-Viejo, F. J. Muñoz

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6 Citations (Scopus)


In this work, we show the suitability of the thin film membrane-based calorimetric technique to measure kinetically limited phase transitions such as the dehydrogenation of metallic hydrides. Different compounds such as Mg, Mg/Al and Mg80Ti20 have been deposited over the active area of the microchip by electron beam evaporation. After several hydrogenation treatments at different temperatures to induce the hydride formation, calorimetric measurements on the dehydrogenation process of those thin films, either in vacuum or in air, are performed at a heating rate of 10 °C/min. We observe a significant reduction in the onset of dehydrogenation for Mg80Ti20 compared with pure Mg or Mg/Al layers, which confirms the beneficial effect of Ti on dehydrogenation. We also show the suitability of the membrane-based nanocalorimeters to be used in parallel with optical methods. Quantification of the energy released during hydrogen desorption remains elusive due to the semi-insulating to metallic transition of the film which affects the calorimetric trace. © 2008 International Association for Hydrogen Energy.
Original languageEnglish
Pages (from-to)2729-2737
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number11
Publication statusPublished - 1 Jun 2008


  • Dehydrogenation
  • Metal hydrides
  • Nanocalorimetry
  • Power compensated calorimetry
  • Thin-film calorimetry


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