Sulfur-doped carbon nanotubes as a conducting agent in supercapacitor electrodes
- Sulfur-doped carbon nanotubes as a conducting agent in supercapacitor electrodes
- 양철민; 고영일; 김지훈; Yoong Ahm Kim; Keun Soo Kim
- Carbon nanotube; Sulfur doping; Supercapacitor electrode; Conducting agent; Electrochemical performance
- Issue Date
- Journal of alloys and compounds
- VOL 855, 157282
- 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.
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