Tailoring morphology to control defect structures in ZnO electrodes for high-performance supercapacitor devices
Najib, Sumaiyah and Bakan, Feray and Abdullayeva, Nazrin and Bahariqushchi, Rahim and Kasap, Sibel and Franzò, Giorgia and Sankir, Mehmet and Demirci Sankir, Nurdan and Mirabella, Salvo and Erdem, Emre (2020) Tailoring morphology to control defect structures in ZnO electrodes for high-performance supercapacitor devices. Nanoscale, 12 (30). pp. 16162-16172. ISSN 2040-3364 (Print) 2040-3372 (Online)
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Official URL: http://dx.doi.org/10.1039/d0nr03921g
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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