Porous α-Fe2O3@C Nanowire Arrays as Flexible Supercapacitors Electrode Materials with Excellent Electrochemical Performances

Dong, Yidi; Lü, Xing; Chen, Kunfeng; Wu, Xiang

doi:10.3390/nano8070487

Cited by 29 publications

(14 citation statements)

References 39 publications

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“…Compared to the values of bare Fe 2 O 3 nanorods (370 A g −1 ) and HPC (323 A g −1 ) electrodes at 1 A g −1 , the maximum C sp of the α-Fe 2 O 3 /HPC hybrid electrode is 706 F g −1 , indicating a larger capacitive property. This result is superior to other recently reported iron oxide-based electrodes at the same current density, such as Fe 2 O 3 /graphene (226 F g −1 ) (Wang et al, 2013), Fe 2 O 3 /CNT (204 F g −1 ) (Yue et al, 2018), Fe 2 O 3 /N-doped CNT (264 F g −1 ) (Gnana Sundara Raj et al, 2020), α-Fe 2 O 3 /C (280 F g −1 ) (Dong et al, 2018), and Fe 2 O 3 /hemp straw (256 F g −1 ) (Jiang et al, 2020). At 10 A g −1 , the C sp of α-Fe 2 O 3 /HPC is 410 F g −1 , showing a decrease as the current density increases.…”

Section: Electrochemical Measurementsmentioning

confidence: 59%

“…Nearly symmetric GCD curves were observed at 1-10 A g −1 (Figure 5C), indicating an excellent coulombic efficiency and superior capacitance of the α-Fe 2 O 3 /HPC//PANI/HPC ASC. The maximum C asy of α-Fe 2 O 3 /HPC//PANI/HPC ASC is 212 F g −1 at 1 A g −1 (Figure 5D), superior to these published α-Fe 2 O 3 /C//MnO 2 (Dong et al, 2018), Fe 2 O 3 /N-CNT//CuCo 2 O 4 (Gnana Sundara Raj et al, 2020), and CF (carbon fiber)-rGO/Fe 2 O 3 //CF-MnOx (Serrapede et al, 2019), comparable to that of α-Fe 2 O 3 @C//CNTs-COOH (Xu et al, 2019) ( Supplementary Table 1). Figure 5E shows the C asy vs. cycle number plot of the α-Fe 2 O 3 /HPC//PANI/HPC ASC, conducted at 1 A g −1 , which is only 5.8% decay of the original capacity after 5,000 cycles.…”

Section: Electrochemical Measurementsmentioning

confidence: 66%

“…By constructing integrated hybrid electrodes, α-Fe 2 O 3 is directly deposited onto conductive skeletons of carbonaceous materials. Carbon nanotubes (Dong et al, 2018;Yue et al, 2018), porous carbon (Arun et al, 2019), and graphene (Xu et al, 2019) can overcome this vexing issue of low conductivity, which indeed demonstrates that integrated hybrid electrodes show better electrochemical performances than individual components because of the synergistic effect between the α-Fe 2 O 3 nanostructure and the carbon configurations. Thus, far, the unsatisfactory dispersion and small surface area of α-Fe 2 O 3 still causes a relatively low specific capacitance.…”

Section: Introductionmentioning

confidence: 94%

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Porous Fe2O3 Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors

Duan

Jiang

2020

Front. Chem.

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In this study, a novel negative electrode material was prepared by aligning α-Fe2O3 nanorods on a hierarchical porous carbon (HPC) skeleton. The skeleton was derived from wheat flour by a facile hydrothermal route to enhance conductivity, improve surface properties, and achieve substantially good electrochemical performances. The α-Fe2O3/HPC electrode exhibits enhanced specific capacitance of 706 F g−1, which is twice higher than that of α-Fe2O3. The advanced α-Fe2O3/HPC//PANI/HPC asymmetrical supercapacitor was built with an expanded voltage of 2.0 V in 1 M Li2SO4, possessing a specific capacitance of 212 F g−1 at 1 A g−1 and a maximum energy density of 117 Wh kg−1 at 1.0 kW kg−1, along with an excellent stability of 5.8% decay in capacitance after 5,000 cycles. This study affords a simple process to develop asymmetric supercapacitors, which exhibit high electrochemical performances and are applicable in next-generation energy storage devices, based on α-Fe2O3 hybrid materials.

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Section: Electrochemical Measurementsmentioning

confidence: 59%

Section: Electrochemical Measurementsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 94%

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Porous Fe2O3 Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors

Duan

Jiang

2020

Front. Chem.

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“…In addition, non-expanding clay can’t be attacked by protons from the interlayer space, so non-expanding illite and kaolinite are more resistant to acid attack than montmorillonite or vermiculite [ 36 , 37 ]. The characteristic diffraction peaks of the hexagonal hematite crystal phases (JCPDS PDF card 33-0664) can be observed at 2 θ = 24.21°, 33.19°, 35.72°, 40.96°, 49.55°, 54.18°, 62.54°, and 64.10° in Clay-IORs [ 38 ], indicating that Fe(III) were converted in-situ to α-Fe 2 O 3 in the presence of clay minerals as green precipitants. In addition, the peaks of some associated minerals (i.e., quartz, muscovite, talc) remain in the Clay-IORs with a decreased intensity, suggesting that the associated minerals may also participate in the hydrothermal reaction.…”

Section: Resultsmentioning

confidence: 99%

Optimal Synthesis of Environment-Friendly Iron Red Pigment from Natural Nanostructured Clay Minerals

Dong

Wang

et al. 2018

Nanomaterials

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A series of environment-friendly clay minerals—α-Fe2O3 iron-red hybrid pigments—were prepared by a simple one-step hydrothermal reaction process using natural nanostructured silicate clay minerals as starting materials. The influence of structure, morphology and composition of different clay minerals on the structure, color properties, and stability of the pigments was studied comparatively by systematic structure characterizations with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmittance electron microscope (TEM), X-ray fluorescence spectroscopy (XRF), X-ray photoelectron spectroscopy (XPS) and CIE-L*a*b* Colorimetric analyses. The results showed that the clay minerals act as green precipitants during the hydrothermal reaction to induce in-situ transformation of Fe(III) ions into Fe2O3 crystals. Meanwhile, they also act as the “micro-reactor” for forming Fe2O3 crystals and the supporter for inhibiting the aggregation of Fe2O3 nanoparticles. The color properties of iron-red hybrid pigments are closely related to the surface charges, surface silanol groups, and solid acid sites of clay minerals. The clay minerals with higher surface activity are more suitable to prepare iron-red pigments with better performance. The iron-red hybrid pigment derived from illite (ILL) clay showed the best red color performance with the color values of L* = 31.8, a* = 35.2, b* = 27.1, C* = 44.4 and h° = 37.6, and exhibited excellent stability in different chemical environments such as acid, alkaline, and also in high-temperature conditions.

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“…Among them, flexible supercapacitors become a promising candidate. The rapid growth of flexible and portable electronics has stimulated enormous efforts to develop multi-purpose, high-power supercapacitors [1,2,3,4,5,6]. Nowadays, flexible supercapacitors are emerging research directions in rechargeable batteries.…”

Section: Introductionmentioning

confidence: 99%

VO2(B)/Graphene Composite-Based Symmetrical Supercapacitor Electrode via Screen Printing for Intelligent Packaging

et al. 2018

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More multipurpose and convenient demand driven by Radio Frequency Identification (RFID) and intelligent packaging require flexible power sources. A VO2(B)/graphene (VO2(B)/GN) core-shell composite was successfully synthesized by the hydrothermal treatment with V2O5 and graphite. The as-obtained sample was characterized by XRD, FT-IR, SEM, TEM, and XPS measurements. In addition, the electrochemical properties of VO2(B)/GN were tested. Due to its great electrochemical performance and mechanical properties, graphene could increase the electrochemical performance and strengthen the structural stability of the material at the same time. With increasing loading amount of GN, the specific capacitance of VO2(B)/GN increased correspondingly. With 20% GN loading, the initial discharge specific capacity could reach 197 F g−1 at 0.5 A g−1, and 160 F g−1 at 1 A g−1 in 0.5 M Na2SO4 electrolyte, which is better than that of pure rod-like VO2(B). The capacitance of the VO2(B)/GN (20%) composite electrode retains 95.49% after 1000 cycles, which is higher than that of a pure VO2(B) electrode (85.43%), indicating that the VO2(B)/GN composite possesses better cycling stability. Moreover, a symmetrical solid-state supercapacitor (SCs) using VO2(B)/GN(20%) as the anode was assembled. Four printed SCs were connected in series to light up a 1.5 V red LED. This demonstrates its potential application in intelligent packaging to trace food safety.

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Porous α-Fe2O3@C Nanowire Arrays as Flexible Supercapacitors Electrode Materials with Excellent Electrochemical Performances

Cited by 29 publications

References 39 publications

Porous Fe2O3 Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors

Porous Fe2O3 Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors

Optimal Synthesis of Environment-Friendly Iron Red Pigment from Natural Nanostructured Clay Minerals

VO2(B)/Graphene Composite-Based Symmetrical Supercapacitor Electrode via Screen Printing for Intelligent Packaging

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