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Effects of Surface Oxygenic Functional Groups on the Electrochemical Properties of Supercapacitor

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The surface oxygenic functional groups are significant to the capacity and cycle stability of supercapacitor. Coconut shell-based activated carbon (CS) with high surface oxygen content was used as starting material and reduced by hydrogen. The measurement results of microstructure showed that the specific surface area and total pore volume increased a little. While the surface oxygen content decreased greatly according to the results of X-ray photoelectron spectroscopy (XPS). Electrochemical behaviors of the electrode built with CS and hydrogen reduced CS (HCS) were investigated in two kinds of electrolytes, 6 mol L−1 KOH and 1 mol L−1 Et4NBF4/PC, respectively. The results showed that the surface oxygen groups have little influence to the electrochemical properties of supercapacitor in KOH electrolyte. As for supercapacitor in Et4NBF4/PC, HCS presents higher specific capacitance, higher energy density, better capacity retention and lower leakage current than those of original CS. This indicates that the surface oxygenic functional groups have reaction and impediment to the organic electrolyte. The study not only provides a simple and effective method for large-scale and safe application of supercapacitors using organic electrolyte, but also offers a better understanding of the action of surface functional groups on the electrochemical performances of porous carbon materials.
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Keywords: Electrochemical properties; Leakage Current; Reduction; Supercapacitor; Surface Oxygenic Functional Groups

Document Type: Research Article

Affiliations: National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China

Publication date: June 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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