Spacing graphene and Ni-Co layered double hydroxides with polypyrrole for high-performance supercapacitors

doi:10.1016/j.jmst.2019.10.030

Abstract

Abstract:

The urgent need of high-performance of energy storage devices triggers us to design newly class of materials. Generally, the materials feature with high conductivity, abundant pores and excellent stability. Here, a sandwiched hybrid composite containing reduced graphene oxide, polypyrrole and Ni-Co layered double hydroxides (RGO/PPy/NiCo-LDH) was prepared in a facile way. The polypyrrole was incorporated in the two dimensional (2D) nanosheets, which not only serve as the spacer to increase the surface area, but also enhance the conductivity of the nanocomposite. The obtained architecture was employed as an advanced electrode in a supercapacitor. The electrode shows an ultrahigh specific capacitance (2534 F g^-1 at 1 A g ^-1) and good cycling efficiency (78 % after 5000 cycles). Moreover, an asymmetric cell based RGO/PPy/NiCo-LDH composite demonstrates excellent electrochemical properties and good prospect of practical use.

Key words: Graphene, Ni-Co layered double hydroxides, Polypyrrole, Supercapacitor, Porous carbon

Jing Liang, Cuili Xiang, Yongjin Zou, Xuebu Hu, Hailiang Chu, Shujun Qiu, Fen Xu, Lixian Sun. Spacing graphene and Ni-Co layered double hydroxides with polypyrrole for high-performance supercapacitors[J]. J. Mater. Sci. Technol., 2020, 55: 190-197.

Figures/Tables 11

Fig. 1. Schematic illustration of the fabrication procedure for RGO/PPy/NiCo-LDH composite.

Fig. 2. SEM images of GO (a), RGO/PPy (b), and RGO/PPy/NiCo-LDH (c, d), TEM image of RGO/PPy/NiCo-LDH (e) and SAED pattern of RGO/PPy/NiCo-LDH (f).

Fig. 3. FT-IR spectra (a) and Raman spectra (b) of GO, RGO/PPy, and RGO/PPy/NiCo-LDH.

Fig. 4. XRD patterns of the GO, RGO-PPy, and RGO/PPy/NiCo-LDH.

Fig. 5. XPS survey spectrum of RGO/PPy/NiCo-LDH (a), high-resolution XPS of Ni 2p (b), Co 2p (c), and N 1s (d).

Fig. 6. N2 adsorption-desorption isotherms (a) and pore-size distribution curves (b) of GO, RGO/PPy, and RGO/PPy/NiCo-LDH.

Fig. 7. Electrochemical characterization of GO, RGO/PPy, and RGO/PPy/ NiCo-LDH electrodes: (a) CV curves at 10 mV s-1; (b) GCD curves at 1 A g-1.

Table 1 Comparison of the specific capacitance of RGO/PPy/NiCo-LDH electrode with some of the recent reports.

Electrode materials	Current density (A g^-1)	Specific capacitance (F g^-1)	Ref.
Co(OH)₂/Ni-Co LDH	1	825	[20]
Co₉S₈@Ni-Co LDH	1.25	1020	[34]
Ni(OH)₂/Co(OH)₂/GO	1	2050.6	[43]
Ni(OH)₂/PNTs	1	864	[44]
PPy/Ni(OH)₂/SGO	2.8	1632.5	[45]
Ni(OH)₂/graphene sheets	0.5	1335	[46]
Co(OH)₂ nanowires	5	358	[47]
Ni(OH)₂/CNTs hybrids	3	1244.2	[48]
Ni-Co binary hydroxides	5	1030	[49]
Ni(OH)₂/3D graphene	1	1450	[50]
RGO/Ni-Co-OH	1	1622	[51]
Carbon cloth/N-doped-LDH	1	1817	[52]
NiCo₂O₄/RGO	0.5	947.4	[53]
NiCo-LDH/RGO	2	1911.1	[54]
RGO/Ag/NiCo₂S₄	2	2438	[55]
RGO/PPy/NiCo-LDH	1	2534	This work

Fig. 8. (a) GCD curves of RGO/PPy/Co-LDH, RGO/PPy/Ni-LDH, and RGO/PPy/ NiCo-LDH at 1 A g-1 and (b) GCD curves of RGO/PPy/NiCo-LDH with various Ni/Co ratios at 1 A g-1.

Fig. 9. Electrochemical performance of RGO/PPy/NiCo-LDH: (a) GCD curve at various current densities; (b) cycling performance at 1 A g-1.

Fig. 10. Electrochemical performance of PPy/NiCo-LDH//RGO ASC: (a) CV curves at 5 mV s-1; (b) GCD curves; (c) Ragone plots; (d) cycling test and coulombic efficiency at 1 A g-1.

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