Abstract
Nanostructured metal-based compound electrodes with excellent electrochemical activity and electrical conductivity are promising for high-performance energy storage applications. In this paper, we report an asymmetric supercapacitor based on Ti and Cu coated vertical-aligned carbon nanotube electrodes on carbon cloth. The active material is achieved by in-situ functionalization using a high-temperature annealing process. Scanning and transmission electron microscopy and Raman spectroscopy confirm the detailed nanostructures and composition of the electrodes. The TiC@VCC and CuxS@VCC electrodes show a high specific capacity of 200.89 F g−1 and 228.37 F g−1, respectively, and good capacitive characteristics at different scan speeds. The excellent performance can be attributed to a large surface area to volume ratio and high electrical conductivity of the electrodes. Furthermore, an asymmetric supercapacitor is assembled with TiC@VCC as anode and CuxS@VCC as cathode. The full device can operate within the 0–1.4 V range, and shows a maximum energy density of 9.12 Wh kg−1 at a power density of 46.88 W kg−1. These findings suggest that the metal-based asymmetric electrodes have a great potential for supercapacitor applications.
Highlights
Supercapacitors (SCs) with outstanding power densities and cycling performances have become one of the most promising power sources for generation microelectronics and portable electronic products (Wang, 2010)
Low-magnification images of TiC@VACNTs on carbon cloth (VCC) and CuxS@VCC are further provided as shown in Figures 4C,D to confirm the material of electrodes
The intensities of the Raman disordered band (D band) and graphitic band (G band) are significantly reduced, confirming that the TiC thin film shell was conformably coated on verticalaligned carbon nanotube (VACNT)
Summary
Supercapacitors (SCs) with outstanding power densities and cycling performances have become one of the most promising power sources for generation microelectronics and portable electronic products (Wang, 2010). To better evaluate the capacitance of CuS based electrodes, an asymmetric supercapacitor cell, constructed with nanostructured CuS networks as the cathode and activated carbon as anode, was demonstrated with a high specific capacity of 49.8 mAh g−1 at a current density of 1 A g−1, and the maximum energy density is 17.7 Wh kg−1 at a power density of 504 W kg−1 (Fu et al, 2016). A high-temperature annealing process is conducted to in-situ functionalize the metal-coated VCC electrodes for the anode and cathode.
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