Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea.
Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea.
Adv Mater. 2017 Aug;29(32). doi: 10.1002/adma.201606728. Epub 2017 Jun 22.
Electrochromic devices have been widely adopted in energy saving applications by taking advantage of the electrode coloration, but it is critical to develop a new electrochromic device that can undergo smart coloration and can have a wide spectrum in transmittance in response to input light intensity while also functioning as a rechargeable energy storage system. In this study, a photoresponsive electrochromic supercapacitor based on cellulose-nanofiber/Ag-nanowire/reduced-graphene-oxide/WO -composite electrode that is capable of undergoing "smart" reversible coloration while simultaneously functioning as a reliable energy-storage device is developed. The fabricated device exhibits a high coloration efficiency of 64.8 cm C and electrochemical performance with specific capacitance of 406.0 F g , energy/power densities of 40.6-47.8 Wh kg and 6.8-16.9 kW kg . The electrochromic supercapacitor exhibits excellent cycle reliability, where 75.0% and 94.1% of its coloration efficiency and electrochemical performance is retained, respectively, beyond 10 000 charge-discharge cycles. Cyclic fatigue tests show that the developed device is mechanically durable and suitable for wearable electronics applications. The smart electrochromic supercapacitor system is then integrated with a solar sensor to enable photoresponsive coloration where the transmittance changes in response to varying light intensity.
电致变色器件利用电极着色在节能应用中得到了广泛应用，但开发一种新的电致变色器件至关重要，这种器件可以智能着色，并在响应输入光强度时在透射率上具有宽光谱，同时还可以作为可再充电储能系统。在这项研究中，开发了一种基于纤维素纳米纤维/Ag 纳米线/还原氧化石墨烯/WO 复合材料电极的光响应电致变色超级电容器，该超级电容器能够进行“智能”可逆着色，同时作为可靠的储能装置。所制备的器件表现出高的着色效率为 64.8 cm C 和电化学性能具有 406.0 F g 的比电容，能量/功率密度为 40.6-47.8 Wh kg 和 6.8-16.9 kW kg 。电致变色超级电容器表现出优异的循环可靠性，超过 10000 次充放电循环后，其着色效率和电化学性能分别保留了 75.0%和 94.1%。循环疲劳测试表明，所开发的器件机械耐用，适用于可穿戴电子应用。然后，将智能电致变色超级电容器系统与太阳能传感器集成，以实现光响应着色，其中透射率根据光强度的变化而变化。
