Journal
NANOTECHNOLOGY
Volume 17, Issue 12, Pages 2963-2967Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/17/12/023
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ZnO nanowires without or with Mg doping were produced by thermally oxidizing pure Zn or ( Zn + Mg) powders. X-ray diffraction (XRD) patterns indicated that ZnO nanowires with and without Mg doping were crystalline with wurzite structure. The highest hydrogen uptake capability was 2.79 wt% at room temperature and 860 psi for Mg-doped ZnO nanowires. 70.1% of the stored hydrogen can be released at ambient pressure. 2.57 wt% uptake and 68.3% release were measured for ZnO nanowires. Fourier transform infrared spectroscopy (FTIR) showed the formation of O - H bonds, while temperature programmed desorption (TPD) suggested that chemisorbed hydrogen could be released only at 100 - 250 degrees C. The H-2 absorption mechanism on ZnO is discussed.
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