Photoresponsive Smart Coloration Electrochromic Supercapacitor
Photoresponsive Smart Coloration Electrochromic Supercapacitor
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DOI：
10.1002/adma.201606728
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发表时间：
2017-06
影响因子：
29.4
通讯作者：
Tae Gwang Yun;Donghyuk Kim;Yong Ho Kim;Minkyu Park;S. Hyun;S. Han
中科院分区：
文献类型：
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作者：
Tae Gwang Yun;Donghyuk Kim;Yong Ho Kim;Minkyu Park;S. Hyun;S. Han
电致变色器件利用电极显色的优势已广泛应用于节能领域，但开发一种新的电致变色器件是至关重要的，该器件既可以进行智能显色，又可以具有响应输入光强的宽透射光谱，同时还可以作为可充电的储能系统。在这项研究中，开发了一种基于纤维素-纳米纤维/银-纳米线/还原-氧化石墨烯/WO3 -复合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。该器件具有64.8 cm2 C−1的显色效率和406.0 F g−1的电化学性能，能量/功率密度为40.6 ~ 47.8 Wh kg−1和6.8 ~ 16.9 kW kg−1。电致变色超级电容器表现出优异的循环可靠性，在超过10,000次充放电循环后，其显色效率和电化学性能分别保持75.0%和94.1%。循环疲劳试验表明，所研制的装置具有良好的机械耐久性，适合于可穿戴电子产品的应用。然后，智能电致变色超级电容器系统与太阳能传感器集成在一起，实现光响应性着色，其中透光率随光强度的变化而变化。
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/WO3‐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 cm2 C−1 and electrochemical performance with specific capacitance of 406.0 F g−1, energy/power densities of 40.6–47.8 Wh kg−1 and 6.8–16.9 kW kg−1. 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.