Recent Advances on Synthesis and Supercapacitor Application of Binary Metal Oxide

doi:10.15541/jim20160452

Abstract

Abstract:

Supercapacitors (SCs) have been regarded as ‘bridges’ between traditional capacitors and batteries, and the integrated performance of SC is essentially determined by its electrode materials. It is found that the capacitance of pseudocapacitive electrode materials can be ten times higher than that of carbon-based electrode materials. As one of the most promising electroactive materials, binary transition metal oxides (BTMOs) and their corresponding composites have been widely studied for energy storage due to their rich redox properties involving multiple oxidation states and different ions. This review presents an extensive description of BTMO materials and the most commonly used synthetic methods. Furthermore, several notable BTMOs and their composites in the application of SCs are reviewed and their prospect and direction of development as well as the scientific problems remaining to be solved are pointed out.

Key words: binary transition metal oxides, composite, supercapacitor, synthetic method, application, review

CLC Number:

TQ174

TIAN Xiao-Dong, LI Xiao, YANG Tao, SONG Yan, LIU Zhan-Jun, GUO Quan-Gui. Recent Advances on Synthesis and Supercapacitor Application of Binary Metal Oxide[J]. Journal of Inorganic Materials, 2017, 32(5): 459-468.

Figures/Tables 10

Table 1 Parameters and performance of BTMOs synthesized by solvothermal method

Materials	Parameters	Specific capacitance	Ref.
NiMoO₄nanospheres	H₂O, 140℃, 12 h	974.4 F/g (1 A/g)	[27]
NiMoO₄ nanorods	Ethanol-H₂O, 140℃, 12 h	944.8 F/g (1 A/g)	[27]
MnMoO₄ nanosheets on Ni foam	H₂O, 150℃, 8 h	1271 F/g (5 mV/s)	[28]
CoMoO₄ nanoplate arrays on Ni foam	H₂O, 180℃, 12 h	1.26 F/cm² (4 mA/cm²)	[29]
NiMoO₄ nanowire arrays on carbon cloth	H₂O, 140℃, 8 h	414.7 F/g (0.25 A/g)	[30]

Fig. 1 (a) Schematic illustration of the formation processes of the NiMoO4 NW arrays on carbon cloth via hydrothermal; SEM images of the prepared NiMoO4 NW arrays on carbon cloth at 140℃ for different hours (b-d) and SEM inage of NiMoO4 NW arrays at 180℃(e) [30]

Fig. 2 FE-SEM and TEM images of porous NiCo2O4 microsphere[32]

Fig. 3 TEM images (a-c), HRTEM image (d) and corresponding SAED pattern (inset in (d)) of the mesoporous NiCo2O4 hollow submicrospheres[40]

Fig. 4 (a) CV curves of NiMoO4·xH2O, CoMoO4, and CoMoO4-NiMoO4·xH2O bundles at a scan rate of 20 mV/s; (b) Specific capacitances of NiMoO4·xH2O, CoMoO4, and CoMoO4-NiMoO4·xH2O bundles at controlled current densities[42]

Fig. 5 (a) Schematic illustration for the formation process of the ternary TMOs with complex 1D nanostructures including tube-in-tube, nanotube, and solid 1D nanostructures; (b) CV curves of NiCo2O4 tube-in-tube nanostructures at various scan rates ranging from 1-20 mV•s-1; (c) the specific capacitance at various current density of NiCo2O4 tube-in-tube, nanotube, and 1D solid nanostructures[47]

Fig. 6 FESEM images of NGF7.5 after 5000 charge-discharge cycles at (a) low and (b) high magnification[48]

Fig. 7 Schematic diagram showing (a) the fabrication of the winding electrode and (b) the fabrication process of the fiber solid-state NCO SCs; (c) Photos of fiber SCs in straight and bending states; (d) CV curves at 80 mV/s in straight and bending states, respectively. (e, f) The capacitance stability of fiber SCs in straight and bending states for 500 cycles, respectively[48]

Fig. 8 Comparison of cycle stability of different samples[51]

Table 2 Comparison of the electrochemical performance of NiCo2O4 obtained by different methods

Materials	Method	C/(F•g^-1)	Rate capability	Cycle performance	Ref.
NiCo₂O₄ nanorobs on carbon nanofibers	Coprecipitation	1026 (1 A/g)	48.7% (20/1)	91.5% (2 A/g, 2000)	[26]
NiCo₂O₄ nanosheets on carbon nanofibers	Coprecipitation	1002 (1 A/g)	51.9% (20/1)	96.4% (2 A/g, 2400)	[26]
NiCo₂O₄microspheres	Microwave assisted synthesis	774 (2 mV/s)	52.3% (100/2)	-	[32]
Ordered mesoporous NiCo₂O₄	Hard template	739 (2.86 A/g)	55.2% (28.6/2.86)	95%(28.6 A/g, 2500)	[38]
NiCo₂O₄hollow submicropheres	Soft template	987 (1 A/g)	62.8% (50/1)	No capacity loss (5 A/g, 5000)	[40]
NiCo₂O₄ nanowires	Microemulsion	1481 (0.5 A/g)	42.2% (8/0.5)	91.4% (2 A/g, 2000)	[44]
NiCo₂O₄tube-in-tube structure	Electrospinning	1756 (1 A/g)	83.0% (20/1)	92.4% (5 A/g, 5000)	[47]
Flower like NiCo₂O₄/3D graphene foam	Electrodeposition	1402 (1 A/g)	77.0% (20/1)	76.6% (5 A/g, 5000)	[48]
NiCo₂O₄@Ppy nanowire arrays on carbon textiles	Hydrothermal	2244 (1 A/g)	60.5% (30/1)	82.9% (3 A/g, 10000)	[54]
Si/NiCo₂O₄ heterostructure	Hydrothermal	1972 (2 A/g)	54.4% (10/2)	78% (10 A/g, 2000)	[55]

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