Kumar Kowsik Sambath, Choudhary Nitin, Pandey Deepak, Hurtado Luis, Chung Hee-Suk, Tetard Laurene, Jung Yeonwoong, Thomas Jayan
Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States of America. NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States of America.
Nanotechnology. 2020 Oct 23;31(43):435405. doi: 10.1088/1361-6528/aba305. Epub 2020 Jul 6.
Flexible smart electronics require their energy storage device to be flexible in nature. Developing high-performance flexible energy storage devices require direct integration of electrode active materials on current collectors to satisfy the high electronic/ionic conductivity and long-term durability requirements. Herein, we develop a flexible all-solid-state asymmetric supercapacitor comprised of reduced graphene oxide (rGO) and core/shell tungsten trioxide/tungsten disulfide (WO/WS) nanowire based electrodes. The electrodes synthesized via electrochemical deposition and chemical vapor deposition avoided the necessity to use non-conductive binders and offered excellent cyclic stability. The structural integrity provided by the rGO and WO/WS electrodes facilitated excellent electrochemical stability with capacitance retention of 90% and 100% after 10 000 charge-discharge cycles, respectively. An all-solid-state device provides a voltage window of 1.5 V and more than 70% capacitance retention after 10 000 charge-discharge cycles. Providing 97% capacitance retention upon mechanical bending reveals its potential to be used as an energy storage devices in flexible electronics.
柔性智能电子设备要求其储能器件本质上具有柔性。开发高性能柔性储能器件需要将电极活性材料直接集成在集流体上，以满足高电子/离子导电性和长期耐久性要求。在此，我们开发了一种由还原氧化石墨烯（rGO）和基于核壳三氧化钨/二硫化钨（WO₃/WS₂）纳米线的电极组成的柔性全固态非对称超级电容器。通过电化学沉积和化学气相沉积合成的电极避免了使用非导电粘合剂的必要性，并具有出色的循环稳定性。rGO和WO₃/WS₂电极提供的结构完整性促进了优异的电化学稳定性，在10000次充放电循环后电容保持率分别为90%和100%。全固态器件提供1.5V的电压窗口，在10000次充放电循环后电容保持率超过70%。在机械弯曲时电容保持率为97%，这表明其有潜力用作柔性电子设备中的储能器件。
