Altaf Cigdem Tuc, Coskun Ozlem, Kumtepe Alihan, Rostas Arpad Mihai, Iatsunskyi Igor, Coy Emerson, Erdem Emre, Sankir Mehmet, Sankir Nurdan Demirci
Department of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, Sogutozu Caddesi No 43 Sogutozu, 06560, Ankara, Turkey.
Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi No 43 Sogutozu, 06560, Ankara, Turkey.
Sci Rep. 2022 Jul 7;12(1):11487. doi: 10.1038/s41598-022-15180-z.
In this study, zinc oxide (ZnO) powders in two different morphologies, nanowire (NW) and nanoflower (NF), have been synthesized by the hydrothermal method. The eligibility of the pristine ZnO nanopowders as a photo-active material has been revealed by designing P-SC devices via the facile drop-casting method on both glass and plastic substrates in large-area applications. The impact of physical properties and especially defect structures on photo-supercapacitor (P-SC) performance have been explored. Although the dark Coulombic efficiency (CE%) of both NW and NF-based P-SC were very close to each other, the CE% of NW P-SC increased 3 times, while the CE% of NF P-SC increased 1.7 times under the UV-light. This is because the charge carriers produced under light excitation, extend the discharge time, and as confirmed by electron paramagnetic resonance, photoluminescence, and transmission electron microscopy analyses, the performance of P-SCs made from NF powders was relatively low compared to those produced from NW due to the high core defects in NF powders. The energy density of 78.1 mWh kg obtained for NF-based P-SCs is very promising, and the capacitance retention value of almost 100% for 3000 cycles showed that the P-SCs produced from these materials were entirely stable. Compared to the literature, the P-SCs we propose in this study are essential for new generation energy storage systems, thanks to their ease of design, adaptability to mass production for large-area applications, and their ability to store more energy under illumination.
在本研究中，通过水热法合成了两种不同形态的氧化锌（ZnO）粉末，即纳米线（NW）和纳米花（NF）。通过在大面积应用中在玻璃和塑料基板上采用简便的滴铸法设计光超级电容器（P-SC）器件，揭示了原始ZnO纳米粉末作为光活性材料的适用性。研究了物理性质尤其是缺陷结构对光超级电容器（P-SC）性能的影响。尽管基于NW和NF的P-SC的暗库仑效率（CE%）彼此非常接近，但在紫外光下，NW P-SC的CE%增加了3倍，而NF P-SC的CE%增加了1.7倍。这是因为光激发产生的电荷载流子延长了放电时间，并且通过电子顺磁共振、光致发光和透射电子显微镜分析证实，由于NF粉末中的高核心缺陷，由NF粉末制成的P-SC的性能相对于由NW制成的P-SC较低。基于NF的P-SC获得的78.1 mWh kg的能量密度非常有前景，并且3000次循环中几乎100%的电容保持值表明由这些材料制成的P-SC完全稳定。与文献相比，我们在本研究中提出的P-SC对于新一代储能系统至关重要，这得益于其易于设计、适用于大面积应用的大规模生产以及在光照下存储更多能量的能力。
