The development of flexibility and robustness in functional devices is an important feature for the next generation of devices for long operational periods. It infers applications for the compactness of batteries, bio- sensors, supercapacitors, wearable devices, and photovoltaics as well. Here, we report a two-step low-cost solution-based process to synthesize (a) free-standing films of graphene oxide (GO) and reduced graphene oxide (rGO) and (b) hybrid sandwich structures of titania and rGO by using simple chemical bath deposition. The microstructure and morphological study are carried out using X-ray diffraction, atomic force microscopy, and scanning electron microscopy. Its electrochemical performance for supercapacitor electrodes were evaluated using three electrode cyclic voltammetry and galvanostatic charge-discharge system at different current density. In our experiment, graphene oxide is showing pseudo capacitance like behaviour, rGO and TiO-rGO-TiO sandwich structure shows supercapacitor like behaviour. The value of capacitance for rGO is found 57.61 F/g. The sandwich structure with 0.17 M titania layers showing 121.92 F/g at 1.5 A/g current density with the highest power density observed 416 W/kg. Thus, this hybrid approach is not only having the potential to significantly boost the performance of future energy storage technologies but can also be used to develop cost-effective wearable electronics.

中文翻译：

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溶液加工独立式 TiO2-rGO-TiO2 夹层膜电极的超电容性能


功能器件的灵活性和鲁棒性的发展是下一代长时间运行器件的重要特征。它还推断了电池、生物传感器、超级电容器、可穿戴设备和光伏电池的紧凑性应用。在这里，我们报告了一种基于两步低成本解决方案的工艺，通过使用合成（a）氧化石墨烯（GO）和还原氧化石墨烯（rGO）的独立薄膜和（b）二氧化钛和rGO的混合夹层结构简单的化学浴沉积。使用X射线衍射、原子力显微镜和扫描电子显微镜进行微观结构和形态研究。采用三电极循环伏安法和恒电流充放电系统在不同电流密度下评价其超级电容器电极的电化学性能。在我们的实验中，氧化石墨烯表现出类似伪电容的行为，rGO 和 TiO-rGO-TiO 夹层结构表现出类似超级电容器的行为。 rGO 的电容值为 57.61 F/g。具有 0.17 M 二氧化钛层的夹层结构在 1.5 A/g 电流密度下显示出 121.92 F/g，观察到的最高功率密度为 416 W/kg。因此，这种混合方法不仅有可能显着提高未来储能技术的性能，而且还可以用于开发具有成本效益的可穿戴电子产品。