Fe2O3 nanowire arrays on Ni-coated yarns as excellent electrodes for high performance wearable yarn-supercapacitor

Wu, Xuhao; Chen, Yuhua; Liang, Kaijie; Yu, Xueang; Zhuang, Qinqin; Yang, Qiao; Liu, Shaofeng; Liao, Shuang; Li, Na; Zhang, Haiyan

doi:10.1016/j.jallcom.2020.158156

Cited by 33 publications

(15 citation statements)

References 27 publications

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“…At 1 mA cm −2 , the energy density of device is 0.102 mWh cm −3 at 4.2 W cm −2 . This is better than some previously reported materials [38][39][40][41] (Table 1). α-Fe 2 O 3 @MnO 2 delivers excellent performance, which can be explained by the following reasons: (a) Nanostructure uniformly covered on the carbon cloth, which provides outstanding electrical conductivity and flexibility; (b) With α-Fe 2 O 3 as a strong mechanical support and MnO 2 as an outer layer, this structure not only protects the morphological structure, but also provides many active sites; (c) The composite utilizes the synergistic effect of α-Fe 2 O 3 and MnO 2 , so that electrode processes high capacitance and low resistance.…”

Section: Resultscontrasting

confidence: 51%

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

Niu

Shang

2022

Nanomaterials

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It is vital to improve the electrochemical performance of negative materials for energy storage devices. The synergistic effect between the composites can improve the total performance. In this work, we prepare α-Fe2O3@MnO2 on carbon cloth through hydrothermal strategies and subsequent electrochemical deposition. The α-Fe2O3@MnO2 hybrid structure benefits electron transfer efficiency and avoids the rapid decay of capacitance caused by volume expansion. The specific capacitance of the as-obtained product is 615 mF cm−2 at 2 mA cm−2. Moreover, a flexible supercapacitor presents an energy density of 0.102 mWh cm−3 at 4.2 W cm−2. Bending tests of the device at different angles show excellent mechanical flexibility.

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Section: Resultscontrasting

confidence: 51%

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

Niu

Shang

2022

Nanomaterials

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“…At a power density of 1185.9 mW/cm 3 (equivalent to 5 kW/kg), the ASC still delivers an energy density 0.57 mWh/cm 3 (equivalent to 2.78 Wh/kg). Table S1 lists the electrochemical performance comparison between AC//RuS 2 ASC with other Ru-based and transition-metal-based ASCs reported in recent literature studies, which again suggests the superiority of the present AC//RuS 2 system. ,,,,− As shown in Figure h, ASC’s cycling performance is measured during 20,000 CV cycles at a scan rate of 200 mV/s. Interestingly, the ASC retains almost 96% of its first cycle capacitance during the test, indicating the excellent stability of electrode materials as well as the electrolyte within a potential window of 0–2 V. A comparison of Nyquist plots before and after the cycling test (Figure S9a, Supporting Information) reveals a negligible change in the Ohmic resistance ( R el ) of the device during cycling, again indicating the excellent stability of electrode materials.…”

Section: Resultsmentioning

confidence: 65%

Asymmetric Supercapacitors with Nanostructured RuS₂

et al. 2021

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A one-step synthesis of sheet-like RuS2 nanoarchitectures exhibiting traits of a potential cathode material for designing high-performance asymmetric supercapacitors (ASCs) is demonstrated. The synthesis includes direct sulfurization of RuO2 in an inert atmosphere at high temperature that results in densely packed nanosheets of RuS2 with a moderate surface area. Such a structure provides abundant sites for faradaic/non-faradaic reactions for energy storage while facilitating ion migration during charge/discharge processes. Furthered from these traits, the RuS2 electrode exhibits substantially enhanced electrochemical performance as compared to the RuO2 electrode. Detailed analyses suggest that the charge storage at higher scan rates is dominated by capacitive processes, while at lower scan rates, the diffusion-controlled process of charge storage in addition to the capacitive processes is responsible for increased capacitance. The as-assembled activated carbon//RuS2 ASC with an optimum cell voltage of 2 V in an aqueous electrolyte exhibits attractive energy-power combination with excellent cycling performance, which outperforms many other recently reported ASCs.

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“…The Fe 2p peaks at 724.58 eV and 710.86 eV in Figure 2e are the Fe 2p peaks of Fe 2 O 3 @TiN/CC representing Fe 2p 1/2 and Fe 2p 3/2 in α-Fe 2 O 3 [28]. As shown in Figure 2f, the peaks at 530.0, 531.4, and 532.5 eV of Fe 2 O 3 @CNTs/CC arise from O 2− , OH − , and O-C=O, respectively [25], and that at 532.6 eV corresponds to the H-O-H of the adsorbed water molecules [33]. The peak at 531.4 eV reflects the O-H of the surface or the internal hydroxyl groups and the chemically adsorbed oxygen [34], and that at 530.0 eV stems from the O 2− in Fe 2 O 3 [35].…”

Section: Electrochemical Measurementsmentioning

confidence: 89%

“…The CNTs offer advantages such as a large surface area, efficient ion diffusion, large active substance loading, and excellent substrate conductivity to improve the rate as well as the energy and power densities of the electrode. The α-MnO 2 @CNTs/CC positive electrode and Fe 2 O 3 @CNTs/CC negative electrodes are prepared (Figure 1) [25] and the electrochemical properties of the two electrodes are determined in 1 M Na 2 SO 4 . An asymmetrical supercapacitor (ASCs) consisting of the α-MnO 2 @CNTs/CC as the positive electrode, Fe 2 O 3 @CNTs/CC as the negative electrode, and 1 M Na 2 SO 4 as the electrolyte is assembled to provide a 2 V window (α-MCNTs//FCNTs-2V).…”

Section: Introductionmentioning

confidence: 99%

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

Zhu

Zhao

et al. 2022

Nanomaterials

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In this study, α-MnO2 and Fe2O3 nanomaterials are prepared on a carbon fiber modified with carbon nanotubes to produce the nonbinder core–shell positive (α-MnO2@CNTs/CC) and negative (Fe2O3@CNTs/CC) electrodes that can be operated in a wide voltage window in ultrafast asymmetrical flexible supercapacitors. MnO2 and Fe2O3 have attracted wide research interests as electrode materials in energy storage applications because of the abundant natural resources, high theoretical specific capacities, environmental friendliness, and low cost. The electrochemical performance of each electrode is assessed in 1 M Na2SO4 and the energy storage properties of the supercapacitors consisting of the two composite electrodes are determined in Na2SO4 and EMImBF4 electrolytes in the 2 V and 4 V windows. The 2 V supercapacitor can withstand a large scanning rate of 5000 mV S−1 without obvious changes in the cyclic voltammetry (CV) curves, besides showing a maximum energy density of 57.29 Wh kg−1 at a power density of 833.35 W kg−1. Furthermore, the supercapacitor retains 87.06% of the capacity after 20,000 galvanostatic charging and discharging (GCD) cycles. The 4 V flexible supercapacitor shows a discharging time of 1260 s and specific capacitance of 124.8 F g−1 at a current of 0.5 mA and retains 87.77% of the initial specific capacitance after 5000 GCD cycles. The mechanical robustness and practicality are demonstrated by physical bending and the powering of LED arrays. In addition, the contributions of the active materials to the capacitive properties and the underlying mechanisms are explored and discussed

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Fe2O3 nanowire arrays on Ni-coated yarns as excellent electrodes for high performance wearable yarn-supercapacitor

Cited by 33 publications

References 27 publications

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

Asymmetric Supercapacitors with Nanostructured RuS₂

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

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Fe2O3 nanowire arrays on Ni-coated yarns as excellent electrodes for high performance wearable yarn-supercapacitor

Cited by 33 publications

References 27 publications

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

Asymmetric Supercapacitors with Nanostructured RuS2

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

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Asymmetric Supercapacitors with Nanostructured RuS₂