Journal
JOURNAL OF POWER SOURCES
Volume 252, Issue -, Pages 90-97Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.12.004
Keywords
Supercapacitor; Sulfur; Specific capacitance; Energy density; Activated carbon
Funding
- National Science Foundation [CMMI-1030048]
- Fundamental Research Funds for the Central University of China [K5051205006]
- China Scholarship Council (CSC)
- NESAC/BIO [EB-002027]
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Sulfurized activated carbon (SAC), made by coating the pore surface with thiophenic sulfur functional groups from the pyrolysis of sulfur flakes, were characterized and tested for supercapacitor applications. From X-ray photoelectron spectroscopy (XPS), the sulfur content in the SAC was found to be 2.7 at%. Electrochemical properties from potentiostatic and galvanostatic measurements, and electrochemical impedance spectroscopy (EIS) were used to evaluate the effect of sulfur on porous carbon electrodes. The SAC electrode exhibits better conductivity, and an obvious increase in specific capacitance that is almost 40% higher than plain activated carbons (ACs) electrode at a high current density of 1.4 A g(-1). The proposed mechanism for improved conductivity and capacitive performance due to the sulfur functional groups on ACs will be discussed. (C) 2013 Elsevier B.V. All rights reserved.
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