Najib Sumaiyah, Bakan Feray, Abdullayeva Nazrin, Bahariqushchi Rahim, Kasap Sibel, Franzò Giorgia, Sankir Mehmet, Demirci Sankir Nurdan, Mirabella Salvo, Erdem Emre
Faculty of Engineering and Natural Sciences, Sabanci University, 34956, Istanbul, Turkey.
Sabanci University SUNUM Nanotechnology Research Centre, 34956 Istanbul, Turkey.
Nanoscale. 2020 Aug 6;12(30):16162-16172. doi: 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 performed via standard 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 location via state-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.
氧化锌（ZnO）纳米结构以纳米颗粒、纳米花和纳米海胆的形式合成。通过标准技术，如X射线衍射（XRD）、扫描电子显微镜（SEM）、光致发光、拉曼光谱和紫外可见（UV-Vis）光谱，对样品进行了结构、电子和光学表征。通过先进的电子顺磁共振（EPR）光谱，研究了每种形态特有的点缺陷结构的浓度和位置。根据核壳模型，所有样品都显示出核心缺陷；然而，表面的缺陷被涂抹掉了。最后，对所有三种形态作为实际超级电容器装置中的电极材料进行了测试，并且该装置的性能，特别是比电容和存储机制，由点缺陷介导。形态依赖的缺陷ZnO电极能够监测从双电层电容器（EDLC）到赝超级电容器的超级电容器装置的工作原理。
