Study on Preparation and Electrochemical Properties of Biomass-Derived Spherical Activated Carbon
Yuzhu Ma,
Cong Zhou,
Baojun Yu,
Mingming Chen,
Chengyang Wang
Issue:
Volume 4, Issue 4, August 2018
Pages:
26-32
Received:
25 October 2018
Accepted:
4 December 2018
Published:
3 January 2019
DOI:
10.11648/j.ajme.20180404.11
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Abstract: Spherical activated carbon (SPs) with hierarchical porous structure was prepared via a simple solvent evaporation method followed by an activation process using leonardite humic acid (LHA) as carbon source. The surface morphologies and pore parameters of the as-prepared SPs were analyzed by scanning electron microscope (SEM) and N2 physical adsorption-desorption instrument. The electrochemical performance of supercapacitors tested by galvanostatic charge-discharge (GCD), cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) are conducted in both aqueous and organic electrolyte. The SPs with high specific surface area (2034 m2 g-1) and pore volume (1.24 cm3 g-1) exhibit a superior higher specific capacitance of 319 F g-1 at a current density of 0.05 A g-1 in aqueous electrolyte compared with powdered activated carbon (SP1). In addition, SPs1 also exhibit a high initial specific capacitance of 154 F·g-1 at 0.05 A·g-1 and a higher capacitance retention of 96.4% than the bulked sample started from the same raw materials in organic electrolyte. These results suggest that the LHA-based spherical activated carbon should be a competitive and promising supercapacitor electrode material.
Abstract: Spherical activated carbon (SPs) with hierarchical porous structure was prepared via a simple solvent evaporation method followed by an activation process using leonardite humic acid (LHA) as carbon source. The surface morphologies and pore parameters of the as-prepared SPs were analyzed by scanning electron microscope (SEM) and N2 physical adsorpt...
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