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J. Mater. Sci. Technol.  2018, Vol. 34 Issue (7): 1103-1109    DOI: 10.1016/j.jmst.2017.12.006
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High-performance asymmetric supercapacitors based on reduced graphene oxide/polyaniline composite electrodes with sandwich-like structure
Jun Maab, Shaochun Tanga, Junaid Ali Syeda, Dongyun Suc, Xiangkang Menga()
aInstitute of Materials Engineering, National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
bSchool of Mechatronics & Traffic Engineering, Nantong College of Science and Technology, Nantong 226007, China
cCollege of Mechanical Engineering, Nantong Vocational University, Nantong 226007, China
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Abstract  

The sandwich-like structure of reduced graphene oxide/polyaniline (RGO/PANI) hybrid electrode was prepared by electrochemical deposition. Both the voltage windows and electrolytes for electrochemical deposition of PANI and RGO were optimized. In the composites, PANI nanofibers were anchored on the surface of the RGO sheets, which avoids the re-stacking of neighboring sheets. The RGO/PANI composite electrode shows a high specific capacitance of 466 F/g at 2 mA/cm2 than that of previously reported RGO/PANI composites. Asymmetric flexible supercapacitors applying RGO/PANI as positive electrode and carbon fiber cloth as negative electrode can be cycled reversibly in the high-voltage region of 0-1.6 V and displays intriguing performance with a maximum specific capacitance of 35.5 mF cm-2. Also, it delivers a high energy density of 45.5 mW h cm-2 at power density of 1250 mW cm-2. Furthermore, the asymmetric device exhibits an excellent long cycle life with 97.6% initial capacitance retention after 5000 cycles. Such composite electrode has a great potential for applications in flexible electronics, roll-up display, and wearable devices.

Key words:  Hybrid electrode      Asymmetric supercapacitor      Sandwich-like      Electrochemical reduced graphene oxide     
Received:  29 October 2017      Published:  22 July 2018

Cite this article: 

Jun Ma, Shaochun Tang, Junaid Ali Syed, Dongyun Su, Xiangkang Meng. High-performance asymmetric supercapacitors based on reduced graphene oxide/polyaniline composite electrodes with sandwich-like structure. J. Mater. Sci. Technol., 2018, 34(7): 1103-1109.

URL: 

http://www.jmst.org/EN/10.1016/j.jmst.2017.12.006     OR     http://www.jmst.org/EN/Y2018/V34/I7/1103

Fig. 1.  Schematic diagram of preparing PANI/RGO composite electrode.
Fig. 2.  CV of (a) step a: electrochemical deposition of PANI, (b) step b: electrochemical reduced graphene oxide, (c) step c: electrochemical deposition of PANI.
Fig. 3.  SEM of (a) CC, (b) PANI(5)/CC, (c) PANI-RGO(10)-PANI/CC, (d) PANI-RGO(20)-PANI/CC, (e) PANI-RGO(30)-PANI/CC, (f) PANI-RGO(40)-PANI/CC.
Fig. 4.  (a) SEM of PANI-RGO(30)-PANI/CC composite electrode; (b) TEM of PANI-RGO(30)-PANI/CC (c) XRD patterns of pure graphite and exfoliated GO (d) XRD patterns of electrochemical reduced graphene oxide (ERGO) and chemical reduced graphene oxide (CRGO).
Fig. 5.  (a) CV curves of PANI-RGO(30)-PANI/CC at different scan rates of 5-100 mV/s; (b) CD curves of PANI-RGO(30)-PANI/CC at current of 2-20 mA/cm2 (1 M H2SO4 aqueous solution); (c) Nyquist plot of PANI-RGO(30)-PANI/CC; (d) the flexible composite film of PANI/RGO/CC.
Fig. 6.  (a) CV of PANI/RGO//CC asymmetric supercapacitor device; (b) CD of PANI/RGO//CC asymmetric supercapacitor device.
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