Preparation and characterization of high value-added activated carbon derived from biowaste walnut shell by KOH activati
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Preparation and characterization of high value-added activated carbon derived from biowaste walnut shell by KOH activation for supercapacitor electrode Dawei Lan1, Mingyan Chen1,3,* , Yucheng Liu1, Qingling Liang1, Wenwen Tu1, Yuanyuan Chen1, Jingjing Liang1, and Feng Qiu2 1
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China 3 School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China 2
Received: 3 March 2020
ABSTRACT
Accepted: 2 September 2020
Walnut shell, a renewable and easy-accessible agricultural biowaste, was utilized as a precursor for the preparation of activated carbon materials with KOH activation in this study. After a series of activation processes, therefore, the activated carbon derived from walnut shells achieved a specific surface area of 1016.4 m2/g. With the advantage of low cost and environmental friendly, the prepared carbon materials have superior electrochemical performance and excellent prospects in the application of supercapacitor electrodes. The morphology and textural properties of the AC samples were examined by N2 adsorption–desorption, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and FTIR spectra. All the electrode samples exhibited excellent electrochemical performance. The AC-650 electrode achieved a maximum specific capacitance of 169.2 F/g at current density of 0.5 A/g in 6 M KOH electrolyte. This work provided an effective approach for the treatment and utilization of agricultural biowastes, which was worthwhile for economic, environmental, and societal viewpoints.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Nowadays, more effective energy storage devices are required given huge fossil fuel combustion coupled, and the environmental threat requires the advancement of Industry. Electrochemical capacitor (EC), known as supercapacitors, which is characteristic of long cycle life and large specific power, has drawn
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https://doi.org/10.1007/s10854-020-04398-0
growing attention in the energy storage technology field [1]. EC has a wide variety of applications [2] such as digital devices, electrical vehicles, and pulsing techniques [3]. Based on the charge-storage mechanism, there are two categories in the EC, pseudocapacitors, and electric double-layer capacitors (EDLCs) [4]. Supercapacitors store energy by the accumulation of charge in an electric double-layer
J Mater Sci: Mater Electron
that formed at electrodes interface under electrostatic forces, which means that the electrodes play an important role in the storage performance of EDLCs [5, 6]. Generally, Activated carbon (AC) is widely regarded as the first alternative electrode material for EDLCs [7], because of its high specific area and excellent conductivity [8–10]. By virtue of the e
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