Green synthesis of ternary-doped layered graphene nanosheets (DGNS) synthesized from waste onion peel for supercapacitor
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Green synthesis of ternary‑doped layered graphene nanosheets (DGNS) synthesized from waste onion peel for supercapacitors Swati Chaudhary1 · Raja Mohan2 · O. P. Sinha1 Received: 31 August 2020 / Accepted: 11 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Wastes produced during food processing in day to day life can cause environmental pollution if not managed properly. One of the best methods to overcome such a problem is to convert this wastage into compost, which can strengthen our ecosystem. However, it may not be possible to convert it into compost every time and thus an alternate process is the need of time. In this regard, the present research work proposed a green synthesis pyrolysis method for ternary-doped layered graphene nanosheets (DGNS) from onion peel wastage. This synthesis process is economically feasible and easily scalable. Further, synthesized DGNS have been analyzed with various characterizations. Finally, electrochemical studies have been also performed to analyze DGNS for energy storage applications. The highest capacitance attained using synthesized materials is 450 A g−1 at 1 A g−1 current density with 2 M H2SO4 electrolytic solution. These results indicated that DGNS are suitable electrode material for high-performance supercapacitors. Keywords Supercapacitors · Green synthesis · Onion peel · Electrochemical studies
1 Introduction In the era of increasing consumption of fossil fuels and their fast depletion, there is a need to develop environmentfriendly non-conventional energy sources and energy storage devices. In recent times, supercapacitors have attracted the researcher’s attention due to their high power density requirements where high power bursts are needed for shorter durations. The increasing interest to electrochemical supercapacitors as energy storage and power delivery technologies in fields of renewable energy systems, hybrid electric vehicles, portable electronics and communication devices are attributed to their remarkable advantages such as high power capability, high rate of charge/discharge, high efficiency, low level of heat emission, environmental friendliness and practically unlimited cycle life [1]. Despite increased research interest and intensive work in this area, high energy density
* Swati Chaudhary [email protected] 1
Amity Institute of Nanotechnology, Amity University, Sector‑125, Noida 201303, Uttar Pradesh, India
Department of Chemistry, PERI Institute of Technology, Chennai 600048, Tamil Nadu, India
2
and power density using environment-friendly materials still require further development. Apart from the above, the development of electrodes from natural derivatives with the desired morphology and texture is also of great interest. Among recently explored electrode materials, carbon materials prepared from natural sources have great potential due to their low cost, easy processing techniques, stability and versatility. Further, functionalization plays an important role in e
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