Hybrid α-Fe 2 O 3 @NiO heterostructures for flexible and high performance supercapacitor electrodes and visible light driven photocatalysts

Yang, Jianqun; Yang, Lijun; Yin, Bing; Zhang, Siwen; Qu, Fengli; Wu, Xiang

doi:10.1016/j.nanoen.2014.09.002

Cited by 203 publications

(77 citation statements)

References 44 publications

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“…The use of pseudocapacitive materials, such as transition metal oxides and conducting polymers [12][13][14][15], instead of carbon based materials, leads to enhanced energy density without significant loss of power density. This enhancement results from the additive effect of fast superficial redox reactions and electric double layer formation at the electrode/electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

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Keywords: electrochemical anodization WO 3 nanostructure phosphoric acid supercapacitor energy storage A B S T R A C T Herein we illustrate the functionality as pseudocapacitive material of tungsten trioxide (WO 3 ) nanochannel layers fabricated by electrochemical anodization of W metal in pure hot ortho-phosphoric acid (o-H 3 PO 4 ). These layers are characterized by a defined nanochannel morphology and show remarkable pseudocapacitive behaviour in the negative potential (À0.8-0.5 V) in neutral aqueous electrolyte (1 M Na 2 SO 4 ). The maximum volumetric capacitance of 397 F cm À3 is obtained at 2 A cm À3. The WO 3 nanochannel layers display full capacitance retention (up to 114%) after 3500 charge-discharge cycles performed at 10 A cm À3 . The relatively high capacitance and retention ability are attributed to the high surface area provided by the regular and defined nanochannel morphology. Kinetic analysis of the electrochemical results for the best performing WO 3 structures, i.e., grown by 2 h-long anodization, reveals the occurrence of pseudocapacitance and diffusional controlled processes. Electrochemical impedance spectroscopy measurements show for the same structures a relatively low electrical resistance, which is the plausible cause for the superior electrochemical behaviour compared to the other structures.

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Section: Introductionmentioning

confidence: 99%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

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“…7,8 Amongst those transition metal elements, due to the high redox activity, and environmentally benign nature, Ni or Co based materials (oxides or hydroxides) are considered to be admirable candidates of pseudocapacitance electrode materials, consequently, those two transition metal oxides or hydroxides gradually become the emphasis of pseudocapacitors study. 9,10 Moreover, some researchers also devote to consider using composite oxides as the electrode materials of supercapacitors or lithium-ions batteries, such as Ni-Co [11][12][13][14][15][16] , Ni-Mn 17, 18 , Co-Mn 19,20 , Fe-Ni 21,22 , Ni-Sn 23,24 , Mn-Fe 25 oxides.…”

mentioning

confidence: 99%

Amorphous Ni–Co Binary Oxide with Hierarchical Porous Structure for Electrochemical Capacitors

Long

Zheng

Xiao

et al. 2015

ACS Appl. Mater. Interfaces

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A simple and outstanding approach is provided to fabricate amorphous structure Ni-Co binary oxide as supercapacitors electrode materials. We can easily obtain porous Ni-Co oxides composite materials via chemical bath deposition and subsequent calcination without any template or complicate operation procedures. The amorphous porous Ni-Co binary oxide exhibits brilliant electrochemical performance: first, the peculiar porous structure can effectively transport electrolytes and shorten the ion diffusion path; second, binary composition and amorphous character introduce more surface defects for redox reactions. It shows a high specific capacitance up to 1607 F g(-1) and can be cycled for 2000 cycles with 91% capacitance retention. In addition, the asymmetric supercapacitor delivers superior energy density of 28 W h kg(-1), and the maximum power density of 3064 W kg(-1) with a high energy density of 10 W h kg(-1).

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“…); (iii) constructing nanoarrays with one-dimensional or two-dimensional morphologies; (iv) fabricating complex heterostructured nanomaterials; (v) preparing, carbon based materials or conducting polymers wrapped active material; and (vi) surfactant/polymer-assisted synthesis, etc. [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

et al. 2015

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Polyvinylpyrrolidone (PVP)-assisted Bi 2 WO 6 nanoparticles were successfully synthesized by sonochemical method. Three different concentrations of PVP (0.05, 0.1, and 0.2 g) were used, and their effects over the structural, morphological, compositional, and electrochemical analysis were studied. The structural investigation revealed the formation of 100 % pure Bi 2 WO 6 phase. The presence of carbon in the PVP-assisted materials was evidenced from differential scanning calorimetry, Fourier transform infra red (FT-IR) spectroscopy and Raman analysis. There was a reduction in the particle size of Bi 2 WO 6 (30-35 nm) upon using PVP. The highly crystalline nature and the presence of carbon coating over Bi 2 WO 6 were evidenced from the high-resolution transmission electron microscopic image. Besides, the calculated d-spacing of 0.19 nm attributed to (2 0 6) lattice plane of Bi 2 WO 6 nanoparticles. Subsequently, a shift in binding energy toward larger values while using PVP was identified through X-ray photoelectron spectroscopic analysis. The electrochemical analysis showed a subsequent enhancement in specific capacitance of PVP-assisted Bi 2 WO 6 (462 F g -1 ) compared with pristine Bi 2 WO 6 (304 F g -1 ) at 3 mA cm -2 .

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Hybrid α-Fe 2 O 3 @NiO heterostructures for flexible and high performance supercapacitor electrodes and visible light driven photocatalysts

Cited by 203 publications

References 44 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Amorphous Ni–Co Binary Oxide with Hierarchical Porous Structure for Electrochemical Capacitors

Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

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