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Tailoring morphology to control defect structures in ZnO electrodes for high-performance supercapacitor devices

Najib, Sumaiyah; Bakan, Feray; Abdullayeva, Nazrin; Bahariqushchi, Rahim; Kasap, Sibel; Franzo, Giorgia; Sankir, Mehmet; Sankir, Nurdan Demirci; Mirabella, Salvo; Erdem, Emre


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        "affiliation": "Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey", 
        "name": "Najib, Sumaiyah"
      }, 
      {
        "affiliation": "Sabanci Univ, SUNUM Nanotechnol Res Ctr, TR-34956 Istanbul, Turkey", 
        "name": "Bakan, Feray"
      }, 
      {
        "affiliation": "TOBB Univ Econ & Technol, Micro & Nanotechnol Grad Program, Sogutozu Cad 43 Sogutozu, TR-06560 Ankara, Turkey", 
        "name": "Abdullayeva, Nazrin"
      }, 
      {
        "affiliation": "IMM CNR, Via S Sofia 64, I-95123 Catania, Italy", 
        "name": "Bahariqushchi, Rahim"
      }, 
      {
        "affiliation": "Sabanci Univ, SUNUM Nanotechnol Res Ctr, TR-34956 Istanbul, Turkey", 
        "name": "Kasap, Sibel"
      }, 
      {
        "affiliation": "IMM CNR, Via S Sofia 64, I-95123 Catania, Italy", 
        "name": "Franzo, Giorgia"
      }, 
      {
        "name": "Sankir, Mehmet"
      }, 
      {
        "name": "Sankir, Nurdan Demirci"
      }, 
      {
        "name": "Mirabella, Salvo"
      }, 
      {
        "name": "Erdem, Emre"
      }
    ], 
    "description": "Zinc oxide (ZnO) nanostructures were synthesized in the form of nanoparticles, nanoflowers and nanourchins. Structural, electronic and optical characterization of the samples was performedviastandard techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence, Raman and ultraviolet-visible (UV-Vis) spectroscopy. Point defect structures which are specific to each morphology have been investigated in terms of their concentration and locationviastate-of-the-art electron paramagnetic resonance (EPR) spectroscopy. According to the core-shell model, all the samples revealed core defects; however, the defects on the surface are smeared out. Finally, all three morphologies have been tested as electrode materials in a real supercapacitor device and the performance of the device, in particular, the specific capacitance and the storage mechanism, has been mediated by the point defects. Morphology-dependent defective ZnO electrodes enable the monitoring of the working principle of the supercapacitor device ranging from electric double-layer capacitors (EDLC) to pseudo-supercapacitors.", 
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      "pages": "16162-16172", 
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    "title": "Tailoring morphology to control defect structures in ZnO electrodes for high-performance supercapacitor devices"
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