Hydrogen storage and PL properties of novel Cd/CdO shelled hollow microspheres prepared under NH3 gas environment

Waheed S. Khan*, Chuanbao Cao, Faheem K. Butt, Zulfiqar Ali, Zahid Usman, Ghulam Nabi, Ayesha Ihsan, Asma Rehman, Irshad Hussain, M. Tanveer, Sajad Hussain

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Here we report the first ever fabrication of metal/semiconductor Cd/CdO shelled hollow microspheres with average diameter of 20-30 μm via heating cadmium metal powder inside horizontal tube furnace at 500 °C for 40 min under ammonia gas flow of 150 sccm. Vapor-solid (VS) based growth mechanism was proposed for the formation of Cd/CdO shelled hollow microspheres (CCOSHMs). The as-prepared product was characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Room temperature photoluminescence (PL) studies exhibited a UV emission band at 395 nm (E = 3.13 eV) which may be ascribed to combined effect of near band edge emission of CdO and Cd related radiative recombination of electrons in s, p conduction band near Fermi surface and the holes in the d bands generated by Xe light excitation. The hydrogen absorption properties of CCOSHMs were investigated at three different temperatures 373, 473, and 573 K. The maximum hydrogen absorption of 1.30 wt% was observed at 573 K which is better than many other materials. This indicates the potential of Cd/CdO shelled hollow microspheres for applications in light emitting devices as well as an interesting material for hydrogen storage research.

Original languageEnglish
Pages (from-to)2332-2336
Number of pages5
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number5
DOIs
Publication statusPublished - 19 Feb 2013

Keywords

  • Hydrogen storage
  • Photoluminescence
  • Shelled hollow microspheres

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