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Paper   IPM / Physic / 15317
School of Physics
  Title:   Synthesis of Galaxite, Mn0. 9Co0. 1Al2O4, and its application as a novel nanocatalyst for electrochemical hydrogen evolution reaction
1.  H. Saeidfirozeh
2.  A. Shafiekhani
3.  A. Beheshti-Marnani
4.  M.B. Askari
  Status:   Published
  Journal: Physica B: Condensed Matter
  Vol.:  538
  Year:  2018
  Pages:   172-178
  Supported by:  IPM
A new compound Mn0.9Co0.1Al2O4 nanowires were synthesized by thermal method. The resulting powder samples were characterized by scanning electron microscopy(SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). We found that a set of phase transformation occurred during the process. Eventually, five phases including three spinal phases, the corundum (á-Al2O3) and MnO were formed at 1100-°C.As dominant morphology, the cubic galaxite nanowires were identified by X-ray analysis. Moreover, X-ray analysis showed that Mn3O4 and Co3O4 nanoparticles were formed in tetragonal and cubic symmetry respectively. The SEM image revealed that a dominate morphology of product has cubic nanowires shape with an average diameter in range 38-43�?�nm. Furthermore, we observed that influence of temperature was very important in the nanowire formation process. Electrochemical hydrogen evolution reaction (HER) of synthetic composite was evaluated and the over potential of HER was calculated about 110-mV with low Tafel slope equal to 42-mV-dec-1, which was comparable with amounts reported transition metal dichalcogenides with satisfying durability

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