Kuttappan Anupama , Merin Tomy , T.S. Xavier , K. A. Ann Mary
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引用次数: 0
Abstract
Despite the pseudocapacitive nature of polyaniline electrode materials, low power density and poor cyclic stability make them undesirable for efficient supercapacitor applications. Herein, trigonal selenium nanocrystallites decorated cellulose/polyaniline composites are prepared through freeze-drying-assisted room temperature polymerization. All Se/cellulose/PANI composites have similar interconnected fibrillar morphology, which facilitates effective conduction of electrons. Se improves the thermal stability of Se-cellulose-PANI by crystallizing in a trigonal form with crystallites that range in size from 4 to 6 nm. While the presence of Se nanocrystallites offers many ion-accessible active areas and short diffusion paths, cellulose provides outstanding cyclic stability to the material. Among the composites studied, the Se-cellulose-PANI composite demonstrates a noticeable areal capacitance and specific capacitance of 4.55 F/cm2 and 238.33 F/g at a sweep rate of 2 mV/s. Furthermore, it exhibits remarkable cyclic stability as it retains 100 % of initial capacitance even after 5000 cycles of charge-discharge. Additionally, the symmetric supercapacitors assembled with Se-cellulose-PANI composites have a high energy density of 0.087 mWh/cm2 and a power density of 10 mW/cm2. Even after 50,000 cycles, the supercapacitor has an excellent capacitance retention value of 99 %. The outcome supports the indefectible potential of the Se-cellulose-PANI composite and favours the development of efficient solid-state energy storage devices.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems