科研之友
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摘要
Activated carbon//zinc (AC//Zn) supercapacitors using alkaline electrolyte become promising as an energy storage device due to their impressive specific capacitance. However, it is limited by a narrow voltage In this work, a new type supercapacitor (AC|PVA-Na2SO4//PVA-KOH|Zn@CFP) was developed using a decoupled electrolyte system comprising Na2SO4-polyvinyl alcohol (PVA)//cation exchange membrane//KOH-PVA, AC as positive electrode and Zinc electrodeposited on the carbon fiber paper (Zn@CFP) as a negative electrode. Importantly, the operational cell voltage was successfully raised to 2.3 V. This design enables autonomous lighting a green light-emitting diode (LED) by a single device. The device delivers a specific capacity of 517.6C g- 1 at 1 A g-1, corresponding to a specific energy of 186.9 Wh kg -1 at 1300 W kg -1, considering that the threedimensional (3D) architecture of Zn@CFP offers a significantly enlarged surface area, thereby facilitating enhanced performance. The device also exhibited good stability, with a capacity retention of approximately 95.3 % after 1000 charge/discharge cycles. Furthermore, the PVA-based decoupled gel electrolyte offers excellent processability and remarkable flexibility. Remarkably, at an elevated temperature of 50 degrees C, the device showed an even higher specific energy of 238.8 Wh kg -1 at 1300 W kg -1. These findings underscore the substantial potential of the wide-voltage zinc-ion supercapacitor. Our strategy offers the device not only a high specific energy but also exceptional flexibility, rendering it highly promising for future applications in wearable electronic devices.
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单位中国科学院
