Development of a high-pressure microbalance for hydrogen storage materials

Andreas Peter Vestbø, Jens Oluf Jensen, Niels Bjerrum

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Pressure-composition isotherms (PCI's) help to determine thermodynamic properties related to hydrogen uptake of materials. PCI's are normally obtained volumetrically with a Sieverts type apparatus or gravimetrically with a microbalance. A potential problem with the gravimetric technique is that the sample is momentarily exposed to air when transferring it to the system often causing unwanted changes such as oxidation and reaction with moisture in the air. In this study, a high-pressure microbalance was built from scratch inside a glove box with inert atmosphere. The system consists of an electromagnetic microbalance, pressure resistant casing for up to 100 bar hydrogen, a flow system for hydrogen and inert gas, heating elements for temperature control, and software for controlling the system. Thermal convection effects are observed and dampened by heating on both the sample and a counterweight. The precision of the mass measurements for a 1 g sample was +/- 5 mu g, and this range proved to be the same independent of pressure and temperature.
Original languageEnglish
JournalJournal of Alloys and Compounds
Volume446
Issue numberSpecial Issue
Pages (from-to)703-706
ISSN0925-8388
DOIs
Publication statusPublished - 31 Oct 2007
Event10th International Symposium on Metal-Hydrogen Systems: Fundamentals and Applications - Lahaina, Maui, United States
Duration: 1 Oct 20066 Oct 2006
Conference number: 10

Conference

Conference10th International Symposium on Metal-Hydrogen Systems
Number10
CountryUnited States
CityLahaina, Maui
Period01/10/200606/10/2006

Keywords

  • gas-solid reactions
  • high-pressure
  • metal hydrides
  • hydrogen absorbing materials
  • thermodynamic properties

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