Applied Physics A

, Volume 96, Issue 2, pp 349–352

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

Authors

  • Matthew Rogers
    • Advanced Energy Technologies DepartmentLawrence Berkeley National Laboratory
    • Department of Mechanical EngineeringUniversity of California at Berkeley
  • Steven Barcelo
    • Advanced Energy Technologies DepartmentLawrence Berkeley National Laboratory
    • Department of Mechanical EngineeringUniversity of California at Berkeley
  • Xiaobo Chen
    • Advanced Energy Technologies DepartmentLawrence Berkeley National Laboratory
    • Department of Mechanical EngineeringUniversity of California at Berkeley
  • Thomas J. Richardson
    • Advanced Energy Technologies DepartmentLawrence Berkeley National Laboratory
  • Vincent Berube
    • Department of PhysicsMassachusetts Institute of Technology
  • Gang Chen
    • Department of Mechanical EngineeringMassachusetts Institute of Technology
  • Mildred S. Dresselhaus
    • Department of PhysicsMassachusetts Institute of Technology
  • Costas P. Grigoropoulos
    • Advanced Energy Technologies DepartmentLawrence Berkeley National Laboratory
    • Department of Mechanical EngineeringUniversity of California at Berkeley
    • Advanced Energy Technologies DepartmentLawrence Berkeley National Laboratory
    • Department of Mechanical EngineeringUniversity of California at Berkeley
Open AccessArticle

DOI: 10.1007/s00339-009-5198-y

Cite this article as:
Rogers, M., Barcelo, S., Chen, X. et al. Appl. Phys. A (2009) 96: 349. doi:10.1007/s00339-009-5198-y

Abstract

Free-standing magnesium–nickel (Mg–Ni) films with extensive nanoscale grain structures were fabricated using a combination of pulsed laser deposition and film delaminating processes. Hydrogen sorption and desorption properties of the films, free from the influence of substrates, were investigated. Oxidation of the material was reduced through the use of a sandwiched free-standing film structure in which the top and bottom layers consist of nanometer-thick Pd layers, which also acted as a catalyst to promote hydrogen uptake and release. Hydrogen storage characteristics were studied at three temperatures, 296, 232, and 180°C, where multiple sorption/desorption cycles were measured gravimetrically. An improvement in hydrogen storage capacity over the bulk Mg–Ni target material was found for the free-standing films. As shown from a Van’t Hoff plot, the thermodynamic stability of the nanograined films is similar to that of Mg2Ni. These results suggest that free-standing films, of which better control of material compositions and microstructures can be realized than is possible for conventional ball-milled powders, represent a useful materials platform for solid-state hydrogen storage research.

PACS

68.43.Mn 68.43.Nr 68.55.-a

Copyright information

© The Author(s) 2009