NiO Electrode Synthesized via Sol-gel Method and Super-Capacitive Performance

doi:10.11901/1005.3093.2016.529

Chinese Journal of Materials Research

2017, Vol. 31

Issue (9): 714-720 DOI: 10.11901/1005.3093.2016.529

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NiO Electrode Synthesized via Sol-gel Method and Super-Capacitive Performance

Ning MI¹(

), Lei ZHAO¹, Maocheng LIU²

1 School of Mechanical Engineering, Longdong University, Qingyang 745000, China
2 State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China

Cite this article:

Ning MI, Lei ZHAO, Maocheng LIU. NiO Electrode Synthesized via Sol-gel Method and Super-Capacitive Performance. Chinese Journal of Materials Research, 2017, 31(9): 714-720.

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Abstract

NiO with maximum specific capacitance of 744 Fg^-1 was successfully synthesized by sol-gel method and then simple calcination. The microstructure and aggregation morphology of the as-prepared NiO electrode were characterized by powder X-ray diffract ometer (XRD) and scanning electron microscopy (SEM), transmission electron microscopy (TEM) and BET. An asymmetric supercapacitor has been constructed with nickel oxide as the positive electrode and activated carbon as the negative electrode, respectively. The performance of the asymmetric supercapacitor was investigated in 2 mol/L KOH aqueous electrolyte using cyclic voltammetry (CV) and galvanostatic charge/discharge test. The asymmetric supercapacitor exhibited excellent energy density, power density and cycle stability, especially good electrochemical stability, i.e. even after consecutive 1,000 cycles the capacitance of the capacitor still kept at 84.3% of the initial value.

Key words: inorganic non-metallic materials asymmetric supercapacitor nickel oxide sol-gel supercapatitor

Received: 27 July 2016

ZTFLH:	TB321
	TM911

Fund: Supported by National Natural Science Foundation of China (No.21403099) and Youth Science and Technology Innovation Project of Longdong University (No.XYZK1608)

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	Ning MI
	Lei ZHAO
	Maocheng LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.529 OR https://www.cjmr.org/EN/Y2017/V31/I9/714

Fig.1 XRD patterns of NiO electrode material

Fig.2 SEM images of NiO electrode material

Fig.3 TEM image of NiO electrode material

Fig.4 N₂ adsorption/desorption isotherms of NiO electrode material; the inset shows pore size distribution of the sample

Fig.5 CV curves of AC (a) and NiO (b) electrodes at a scan rate of 5 mVs^-1

Fig.6 Charge/discharge curves of the NiO electrode in the potential window 0 to 0.4 V (a) and AC electrode in the potential window of -1 to 0 V (b)

Fig.7 Electrochemical curves of asymmetric supercapacitor in 2 mol/L KOH solution (a) CV curves at different scan rates and (b) charge/discharge behavior at different current densities

Fig.8 Curves of the variational specific capacitance by different current densities for asymmetric supercapacitor (a) and AC-based EDLC capacitor (b)

Fig.9 Ragone plot of asymmetric supercapacitor (a) and AC-based EDLC capacitor (b)

Fig.10 Cycle life of the asymmetric supercapacitor at a current density of 10 mAcm^-2,the inset is charge/discharge curves of the asymmetric supercapacitor

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