Energizing Fe2O3-based supercapacitors with tunable surface pseudocapacitance via physical spatial-confining strategy

Cheng, Situo; Zhang, Yaxiong; Liu, Yupeng; Sun, Zhenheng; Peng, Chi; Zhang, Junli; Hua, Xiaohui; Su, Qing; Fu, Jiecai; Xie, Erqing

doi:10.1016/j.cej.2020.126875

Cited by 74 publications

(34 citation statements)

References 66 publications

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“…As shown in Figure 8 a, the value is much higher than that of other asymmetric supercapacitors reported previously [ 36 , 37 , 38 , 39 , 40 , 41 ]. The Nyquist plot of the device in Figure 8 b shows an equivalent series resistance (Rs = 8.5 Ω), which is lower than the reported result [ 27 ], and the measured charge-transfer resistance (R ct = 19.49 Ω) may be caused by the existence of the proton exchange membrane. In addition, the multi-cycling test, shown in Figure 8 c, manifests that the ASC device has a capacitance retention rate of 102% after 10,000 cycles.…”

Section: Resultscontrasting

confidence: 62%

“…Compared with pseudo-capacitance electrode materials, they have better physical and chemical stability, higher electrical conductivity, larger specific surface area [ 23 , 24 , 25 ], and more importantly, stable electrochemical performance in acid electrolytes in the wide potential window. However, the low capacitance of the carbon-based materials may limit their application in supercapacitors [ 26 , 27 ]. Recently, being coupled with the redox-active electrolyte has been identified as an effective way to improve their electrochemical performance as the occurrence of the redox reaction of the additives in the electrolyte on the electrode/electrolyte interface will provide additional pseudo-capacitance for the electrochemical system [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

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High Performance Asymmetric Supercapacitor Based on Hierarchical Carbon Cloth In Situ Deposited with h-WO3 Nanobelts as Negative Electrode and Carbon Nanotubes as Positive Electrode

Lin

2021

Micromachines

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Urchin-like tungsten oxide (WO3) microspheres self-assembled with nanobelts are deposited on the surface of the hydrophilic carbon cloth (CC) current collector via hydrothermal reaction. The WO3 nanobelts in the urchin-like microspheres are in the hexagonal crystalline phase, and their widths are around 30–50 nm. The resulted hierarchical WO3 / CC electrode exhibits a capacitance of 3400 mF / cm2 in H2SO4 electrolyte in the voltage window of −0.5 ~ 0.2 V, which makes it an excellent negative electrode for asymmetric supercapacitors. To improve the capacitive performance of the positive electrode and make it comparable with that of the WO3 / CC electrode, both the electrode material and the electrolyte have been carefully designed and prepared. Therefore, the hydrophilic CC is further coated with carbon nanotubes (CNTs) to create a hierarchical CNT / CC electrode via a convenient flame synthesis method, and a redox-active electrolyte containing an Fe2+ / Fe 3+ couple is introduced into the half-cell system as well. As a result, the high performance of the asymmetric supercapacitor assembled with both the asymmetric electrodes and electrolytes has been realized. It exhibits remarkable energy density as large as 403 μW h / cm2 at 15 mW / cm2 and excellent cyclic stability after 10,000 cycles.

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Section: Resultscontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

High Performance Asymmetric Supercapacitor Based on Hierarchical Carbon Cloth In Situ Deposited with h-WO3 Nanobelts as Negative Electrode and Carbon Nanotubes as Positive Electrode

Lin

2021

Micromachines

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“…In addition, the mixture of a polymer binder with active materials will lead to an increase in the dead area, which can suppress the migration of electron and ions. 15 (ii) A combination of bimetallic oxides can synthesize better structures; however, it does not optimize conductivity. 16 Mai et al fabricated MnMoO 4 /CoMoO 4 heterostructured nanowires via a simple refluxing strategy, which showed only 187.1 F g −1 at 1 A g −1 .…”

Section: Introductionmentioning

confidence: 99%

Interfacial Engineering in Crystalline Cobalt Tungstate/Amorphous Cobalt Boride Heterogeneous Nanostructures for Enhanced Electrochemical Performances

Hou

Gao

Kong

2020

ACS Appl. Energy Mater.

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Interfacial engineering is one of the feasible pathways to tune the characteristics and functions of nanomaterials. In this report, we successfully synthesized crystalline CoWO 4 /amorphous Co−B heterostructures that enable superior electrochemical performance. The electrodes overcome the defect of low conductivity of cobalt tungstate and also expose more active sites. The optimized CoWO 4 /Co−B electrode has a remarkable specific capacity of 177.4 C g −1 at 0.5 A g −1 and a great specific capacity retention of 100% at 5 A g −1 after 10,000 cycles with reasonable cycling stability. Moreover, the Co−B/CoWo 4 electrode and activated carbon electrode are combined to assemble an asymmetric supercapacitor, which achieves 22.26 W h kg −1 maximum energy density at 200 W kg −1 and a capacity retention of 95.65% after 10,000 cycles at 2 A g −1 . In general, the work shows the unique characteristics of the crystalline/amorphous nanoheterostructure and provides a direction for future studies on increasing the electrochemical character and application of nanomaterials through regulating the interface contact of composites.

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“…The lattice spacing of 0.27 nm well corresponds to the (104) crystal plane of Fe 2 O 3 [42], which proves the successful preparation of Fe 2 O 3 nanoarray coated with an ultra-thin carbon layer. As can be seen from Fig.…”

Section: Resultsmentioning

confidence: 63%

Water-based asymmetric supercapacitors with 2.5 V wide potential and high energy density based on Na0.6CoO2 nanoarray formed via electrochemical oxidation

Liu

Qiu

Cui

et al. 2022

Carbon

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Energizing Fe2O3-based supercapacitors with tunable surface pseudocapacitance via physical spatial-confining strategy

Cited by 74 publications

References 66 publications

High Performance Asymmetric Supercapacitor Based on Hierarchical Carbon Cloth In Situ Deposited with h-WO3 Nanobelts as Negative Electrode and Carbon Nanotubes as Positive Electrode

High Performance Asymmetric Supercapacitor Based on Hierarchical Carbon Cloth In Situ Deposited with h-WO3 Nanobelts as Negative Electrode and Carbon Nanotubes as Positive Electrode

Interfacial Engineering in Crystalline Cobalt Tungstate/Amorphous Cobalt Boride Heterogeneous Nanostructures for Enhanced Electrochemical Performances

Water-based asymmetric supercapacitors with 2.5 V wide potential and high energy density based on Na0.6CoO2 nanoarray formed via electrochemical oxidation

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