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Electrodeposition of porous graphene networks on nickel foams as supercapacitor electrodes with high capacitance and remarkable cyclic stability.

Yang S, Deng B, Ge R, Zhang L, Wang H, Zhang Z, Zhu W, Wang G - Nanoscale Res Lett (2014)

Bottom Line: The electrodeposition process was accomplished by electrochemical reduction of graphene oxide (GO) in its aqueous suspension.The resultant binder-free PG/NF electrodes exhibited excellent double-layer capacitive performance with a high rate capability and a high specific capacitance of 183.2 mF cm(-2) at the current density of 1 mA cm(-2).Moreover, the specific capacitance maintains nearly 100% over 10,000 charge-discharge cycles, demonstrating a remarkable cyclic stability of these porous supercapacitor electrodes. 82.47.Uv (Electrochemical capacitors); 82.45.Fk (Electrodes electrochemistry); 81.05.Rm (Fabrication of porous materials).

View Article: PubMed Central - PubMed

Affiliation: Hefei National Laboratory for Physical Sciences at Microscale, and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China, shorlin@mail.ustc.edu.cn.

ABSTRACT

Unlabelled: We describe a facile, low-cost, and green method to fabricate porous graphene networks/nickel foam (PG/NF) electrodes by electrochemical deposition of graphene sheets on nickel foams (NFs) for the application of supercapacitor electrodes. The electrodeposition process was accomplished by electrochemical reduction of graphene oxide (GO) in its aqueous suspension. The resultant binder-free PG/NF electrodes exhibited excellent double-layer capacitive performance with a high rate capability and a high specific capacitance of 183.2 mF cm(-2) at the current density of 1 mA cm(-2). Moreover, the specific capacitance maintains nearly 100% over 10,000 charge-discharge cycles, demonstrating a remarkable cyclic stability of these porous supercapacitor electrodes.

Pacs: 82.47.Uv (Electrochemical capacitors); 82.45.Fk (Electrodes electrochemistry); 81.05.Rm (Fabrication of porous materials).

No MeSH data available.


Electrochemical measurements of the PG/NF deposited under the potential of -1.2 V with the deposition time of 500 s. (A) Cyclic voltammetry curves at different scan rates. (B) Magnification of the CV curves for the scan rates of 10, 20, and 50 mV s-1 in (A). (C) Galvanostatic charge-discharge curves measured with different current densities. (D) Plot of specific capacitances at different current densities. (E) Cyclic stability test at scan rate of 500 mV s-1. (F) Nyquist plot of EIS. Inset: plot on enlarged scale.
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Fig5: Electrochemical measurements of the PG/NF deposited under the potential of -1.2 V with the deposition time of 500 s. (A) Cyclic voltammetry curves at different scan rates. (B) Magnification of the CV curves for the scan rates of 10, 20, and 50 mV s-1 in (A). (C) Galvanostatic charge-discharge curves measured with different current densities. (D) Plot of specific capacitances at different current densities. (E) Cyclic stability test at scan rate of 500 mV s-1. (F) Nyquist plot of EIS. Inset: plot on enlarged scale.

Mentions: In the following experiment, we performed detailed electrochemical characterization of the PG/NF electrode prepared under the deposition potential of -1.2 V with the time of 500 s. Figure 5A presents the CV behavior of the PG/NF under different scan rates from 10 to 1,000 mV s-1, and Figure 5B shows the CV curves for the scan rates from 10 to 50 mV s-1 on enlarged scale. The rectangular shape and the absence of redox peaks for all curves imply that the charge dispersion at the electrode surfaces follows the mechanism of electric double-layer capacitors [28]. The CV curve keeps a quasi-rectangular shape even at a high rate of 1 V s-1, suggesting that the PG/NF electrode has a good rate performance and a low internal resistance [40].Figure 5


Electrodeposition of porous graphene networks on nickel foams as supercapacitor electrodes with high capacitance and remarkable cyclic stability.

Yang S, Deng B, Ge R, Zhang L, Wang H, Zhang Z, Zhu W, Wang G - Nanoscale Res Lett (2014)

Electrochemical measurements of the PG/NF deposited under the potential of -1.2 V with the deposition time of 500 s. (A) Cyclic voltammetry curves at different scan rates. (B) Magnification of the CV curves for the scan rates of 10, 20, and 50 mV s-1 in (A). (C) Galvanostatic charge-discharge curves measured with different current densities. (D) Plot of specific capacitances at different current densities. (E) Cyclic stability test at scan rate of 500 mV s-1. (F) Nyquist plot of EIS. Inset: plot on enlarged scale.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493843&req=5

Fig5: Electrochemical measurements of the PG/NF deposited under the potential of -1.2 V with the deposition time of 500 s. (A) Cyclic voltammetry curves at different scan rates. (B) Magnification of the CV curves for the scan rates of 10, 20, and 50 mV s-1 in (A). (C) Galvanostatic charge-discharge curves measured with different current densities. (D) Plot of specific capacitances at different current densities. (E) Cyclic stability test at scan rate of 500 mV s-1. (F) Nyquist plot of EIS. Inset: plot on enlarged scale.
Mentions: In the following experiment, we performed detailed electrochemical characterization of the PG/NF electrode prepared under the deposition potential of -1.2 V with the time of 500 s. Figure 5A presents the CV behavior of the PG/NF under different scan rates from 10 to 1,000 mV s-1, and Figure 5B shows the CV curves for the scan rates from 10 to 50 mV s-1 on enlarged scale. The rectangular shape and the absence of redox peaks for all curves imply that the charge dispersion at the electrode surfaces follows the mechanism of electric double-layer capacitors [28]. The CV curve keeps a quasi-rectangular shape even at a high rate of 1 V s-1, suggesting that the PG/NF electrode has a good rate performance and a low internal resistance [40].Figure 5

Bottom Line: The electrodeposition process was accomplished by electrochemical reduction of graphene oxide (GO) in its aqueous suspension.The resultant binder-free PG/NF electrodes exhibited excellent double-layer capacitive performance with a high rate capability and a high specific capacitance of 183.2 mF cm(-2) at the current density of 1 mA cm(-2).Moreover, the specific capacitance maintains nearly 100% over 10,000 charge-discharge cycles, demonstrating a remarkable cyclic stability of these porous supercapacitor electrodes. 82.47.Uv (Electrochemical capacitors); 82.45.Fk (Electrodes electrochemistry); 81.05.Rm (Fabrication of porous materials).

View Article: PubMed Central - PubMed

Affiliation: Hefei National Laboratory for Physical Sciences at Microscale, and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China, shorlin@mail.ustc.edu.cn.

ABSTRACT

Unlabelled: We describe a facile, low-cost, and green method to fabricate porous graphene networks/nickel foam (PG/NF) electrodes by electrochemical deposition of graphene sheets on nickel foams (NFs) for the application of supercapacitor electrodes. The electrodeposition process was accomplished by electrochemical reduction of graphene oxide (GO) in its aqueous suspension. The resultant binder-free PG/NF electrodes exhibited excellent double-layer capacitive performance with a high rate capability and a high specific capacitance of 183.2 mF cm(-2) at the current density of 1 mA cm(-2). Moreover, the specific capacitance maintains nearly 100% over 10,000 charge-discharge cycles, demonstrating a remarkable cyclic stability of these porous supercapacitor electrodes.

Pacs: 82.47.Uv (Electrochemical capacitors); 82.45.Fk (Electrodes electrochemistry); 81.05.Rm (Fabrication of porous materials).

No MeSH data available.