Abstract
A flexible filter paper based composite electrode was prepared via the convenient one-step synthesis of silver doped graphene for the first time, followed by in-situ polymerization of aniline monomers. Using L-ascorbic acid for simultaneous reduction of grapheme oxide and silver nitrate, we provided a new and green method to prepare graphene hybrid sheets without toxicity. It was found that the as-fabricated hybrid electrode formed a three-dimensional porous architecture, which not only increased the specific surface area of composite, but also facilitated the ion diffusion of the electrolyte. In addition, according to the tests of electrochemical performances, the flexible hybrid electrode subsequently exhibited exceptional specific capacitance of 437.3 F/g, energy density of 1133.5 W·h/kg and power density of 88.8 kW/kg, respectively. Meanwhile, the as-prepared hybrid demonstrated a good cycling stability with only 10.99% specific capacitance deterioration after 5000 times of cycling. This preparation technology presented here shows great potential for the development and application of wearable and portable energy storage devices, particularly for flexible supercapacitors. Moreover, this study puts forward a general, simple and low-cost route of fabricating a novel flexible electrode on a large scale, eventually for environmental protection.
Highlights
With the aggravation of environmental pollution and the over exploitation of natural resources, the development and utilization of renewable energy has aroused extensive attention and research throughout the world
Depending on the charge storage mechanisms, supercapacitors can be divided into two general categories: Electric double layer capacitors (EDLCs) and faradaic pseudocapacitors [5,6]
In order to combine the advantages of EDLCs and pseudocapacitors, hybrid supercapacitors were fabricated by using the carbon nanomaterial/metal oxide/ polyaniline composite as electrodes [9,10,11]
Summary
With the aggravation of environmental pollution and the over exploitation of natural resources, the development and utilization of renewable energy has aroused extensive attention and research throughout the world. Like other paper-based supercapacitors, the low electrochemical activity and poor electrical conductivity of FP seriously hindered the development and application in portable and wearable electric devices To overcome this drawback, it is of great significance to explore new modification methods of paper-based substrates. The most frequently used way is to deposit various carbon nanomaterials on the surfaces of cellulose paper, which can improve electrochemical performances remarkably [20] Another straightforward approach is to prepare metallic nanoparticles to increase the conductivity of paper-based substrates. The electrochemical results showed an excellent specific capacitance of 437.3 F/g, energy density of 1133.5 W h/kg and power density of 88.8 kW/kg, respectively The reason for this was that the silver nanoparticles, graphene and polyaniline combined with the porous filter paper produced synergistic effects in the hybrid. The specific capacitance retention of flexible electrode was up to 89.01% after 5000 cycles, indicating good cycling stability
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