Sulfur-doped carbon nanotubes as a conducting agent in supercapacitor electrodes

The electrochemical performance of sulfur-doped carbon nanotubes (S-CNTs) was investigated to confirm the S-doping effects and the possibility of their application as conducting agents in supercapacitor electrodes. S-CNTs were successfully synthesized via chemical vapor deposition using dimethyl dis...

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Bibliographic Details
Published in:	Journal of alloys and compounds 2021-02, Vol.855, p.157282, Article 157282
Main Authors:	Kim, Ji Hoon, Ko, Yong-il, Kim, Yoong Ahm, Kim, Keun Soo, Yang, Cheol-Min
Format:	Article
Language:	eng
Subjects:	Activated carbon Atomic properties Carbon Carbon nanotube Charge transfer Chemical synthesis Chemical vapor deposition Conducting agent Doping Electrical resistivity Electrochemical analysis Electrochemical performance Electrodes Electrons Heat treatment Multi wall carbon nanotubes Sulfur Sulfur doping Supercapacitor electrode Supercapacitors
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Summary:	The electrochemical performance of sulfur-doped carbon nanotubes (S-CNTs) was investigated to confirm the S-doping effects and the possibility of their application as conducting agents in supercapacitor electrodes. S-CNTs were successfully synthesized via chemical vapor deposition using dimethyl disulfide as the carbon source. They were purified to obtain purified S-CNTs (P–S-CNTs) with diameters 30–50 nm and S content of 0.65 at%. The doped S atoms were removed partially from the P–S-CNTs by heat treatment in H2 atmosphere (De-P-S-CNTs). To compare the electrochemical performances of various conducting materials for supercapacitor electrodes, commercial activated carbon (MSP20) was used as the active material and commercial conducting agent (Super-P), commercial multi-walled CNTs (MWCNTs), De-P-S-CNTs, and P–S-CNTs were used as the conducting agents. The electrode with P–S-CNTs exhibited the highest specific capacitance at a high discharge current density of 100 mA cm−2 (120.2 F g−1) and the lowest charge-transfer resistance (6.19 Ω) that are significantly superior to those of Super-P (83.9 F g−1 and 15.16 Ω), MWCNTs (87.8 F g−1 and 17.02 Ω), and De-P-S-CNTs (90.1 F g−1 and 22.33 Ω). The superior electrochemical performance of P–S-CNTs can be attributed to the excellent electrical conductivity and pseudocapacitive contribution of the S-doping effect. [Display omitted] •Sulfur-doped carbon nanotubes (S-CNTs) are synthesized by chemical vapor deposition.•Purified S-CNTs can be used as conducting agents in supercapacitor electrodes.•Electrochemical performance of CNTs is enhanced by sulfur (S) doping.•Conductivity and pseudocapacitive contribution of S doping improve electrochemical performance.
ISSN:	0925-8388 1873-4669