TY - JOUR
T1 - NiCo2O4-decorated porous carbon nanosheets for high-performance supercapacitors
AU - Veeramani, Vediyappan
AU - Madhu, Rajesh
AU - Chen, Shen Ming
AU - Sivakumar, Mani
AU - Hung, Chin Te
AU - Miyamoto, Nobuyoshi
AU - Liu, Shang Bin
N1 - Funding Information:
The authors are grateful for the financial support (NSC 101-2113-M-027-001-MY3 to SMC and MOST 104-2113-M-001-019 to SBL) from the Ministry of Science and Technology (MOST), Taiwan. R.M and N.M are grateful to the Japan Society for the Promotion of Science (JSPS-16F16048) KAKENHI from MEXT, Japan.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/9/1
Y1 - 2017/9/1
N2 - A facile hydrothermal method is invoked for direct template-free synthesis of nickel cobaltite (NiCo2O4)-decorated porous carbon nanosheets using polymeric 3,4-ethylenedioxythiophene (EDOT) as the precursor. The nanocomposite materials (named as NC-ECN) so fabricated were characterized by a variety of different techniques (viz. SEM/TEM, XPS, EDX etc.). These novel NC-ECN nanocomposites, which exhibit flower-like morphology and excellent electrochemical properties such as good electric conductivity and redox properties, high specific capacitance, excellent rate capability and cyclability, are shown to be desirable for high-performance pseudosupercapacitor applications. On the basis of cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) measurements, the NC-ECN modified electrode was found to exhibit a maximum specific capacitance of 596.8 F g−1 measured at a current density of 2 A g−1 over an aqueous 6.0 M KOH electrolyte solution. Moreover, the fabricated supercapacitor is also found to have excellent cyclability, retaining ca. 98% of its capacitance over more than 3,000 charge-discharge cycles. The excellent pseudocapacitive performances observed for the NC-ECN electrode results are attributed to the synergistic effect of redox characteristics of binary metal oxide and the improved electric conductivity of the porous ECN carbon nanosheets, which effectively enhances kinetics of ion diffusion.
AB - A facile hydrothermal method is invoked for direct template-free synthesis of nickel cobaltite (NiCo2O4)-decorated porous carbon nanosheets using polymeric 3,4-ethylenedioxythiophene (EDOT) as the precursor. The nanocomposite materials (named as NC-ECN) so fabricated were characterized by a variety of different techniques (viz. SEM/TEM, XPS, EDX etc.). These novel NC-ECN nanocomposites, which exhibit flower-like morphology and excellent electrochemical properties such as good electric conductivity and redox properties, high specific capacitance, excellent rate capability and cyclability, are shown to be desirable for high-performance pseudosupercapacitor applications. On the basis of cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) measurements, the NC-ECN modified electrode was found to exhibit a maximum specific capacitance of 596.8 F g−1 measured at a current density of 2 A g−1 over an aqueous 6.0 M KOH electrolyte solution. Moreover, the fabricated supercapacitor is also found to have excellent cyclability, retaining ca. 98% of its capacitance over more than 3,000 charge-discharge cycles. The excellent pseudocapacitive performances observed for the NC-ECN electrode results are attributed to the synergistic effect of redox characteristics of binary metal oxide and the improved electric conductivity of the porous ECN carbon nanosheets, which effectively enhances kinetics of ion diffusion.
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U2 - 10.1016/j.electacta.2017.06.171
DO - 10.1016/j.electacta.2017.06.171
M3 - Article
AN - SCOPUS:85022346046
VL - 247
SP - 288
EP - 295
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -