α-MnO2 nanotube@δ-MnO2 nanoflake hierarchical structure on three-dimensional graphene foam as a lightweight and free-standing supercapacitor electrode

He, Mi; Cao, Linli; Li, Weilong; Chang, Xinwei; Ren, Zhaoyu

doi:10.1016/j.jallcom.2021.158934

Cited by 22 publications

(13 citation statements)

References 48 publications

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“…The energy density is calculated as 54 Wh kg À1 at the power density of 181 W kg À1 , which outperforms the recently reported MnO 2 -based symmetric supercapacitors [62][63][64][65][66][67][68][69] and is even higher than the advanced asymmetric supercapacitors in literature. [70][71][72][73][74] Even at a high power density of 2.08 kW kg À1 , the device can still achieve an energy density of 8.829 Wh kg À1 . Two symmetric supercapacitors connected in parallel can drive a blue LED light successfully, indicating the practicability of the supercapacitors (Figure 7f ).…”

Section: Electrochemical Characterization Of Supercapacitorsmentioning

confidence: 99%

Nano Carbon/Vertical Graphene/MnO₂ Nanosheets Composite Particles for High‐Performance Supercapacitors

Lin

Zhao

et al. 2022

Energy Tech

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Compounding carbon substrate materials with pseudocapacitive materials is an important strategy for making high-performance supercapacitor materials. Nano carbon black (CB) is widely used as the conductive additive in energy storage devices owing to its low cost, high conductivity, good spreadability, and excellent ability of adsorbing electrolyte, reducing the binder consumption, adjusting the pore size and fraction of the electrode, and high-voltage operation. However, very little attention has been paid to applying CB as the substrate materials for producing composite active materials. Herein, a surface-modified CB is developed by growing vertical graphene nanosheets on the surface of CB by chemical vapor deposition. After growing MnO 2 nanosheets on the modified CB, the obtained nanocomposites deliver high specific capacitance, rate performance, and cycling stability. The assembled symmetric supercapacitor obtains a high energy density of 54 Wh kg À1 at a power density of 181 W kg À1 . Systematic experimental research reveals the superior performance benefits from the surface modification of CB by vertical graphene nanosheets, which improves the electrical conductivity, thermal stability, and pore structure of the whole electrodes. This method is of great promise for the development of new materials for highperformance supercapacitors.

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Section: Electrochemical Characterization Of Supercapacitorsmentioning

confidence: 99%

Nano Carbon/Vertical Graphene/MnO₂ Nanosheets Composite Particles for High‐Performance Supercapacitors

Lin

Zhao

et al. 2022

Energy Tech

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“…Owing to the excellent properties of CNTs, the α-MCNTs//FCNTs-2V device retains 87.06% of its initial capacity, that is better than α-M//F-2V (49.46%) and most other devices shown in Table S3. According to Equations ( 2) and ( 3), the energy and power densities of α-MCNTs//FCNTs-2V are calculated and shown in Figure 8i and compared to other Mn-based supercapacitors in Figure 8i and Table S3 [ [49][50][51][52]. The total mass loading of α-MnO 2 on CNTs/CC is about 0.73 mg cm −2 and the discharging time at different current densities are used to calculate the energy and power densities.…”

Section: Electrochemical Performance Of α-Mno2-based Supercapacitor D...mentioning

confidence: 99%

“…Comparison of the electrochemical properties of MnO 2 -based supercapacitors. References [47,[49][50][51][52][53][54][55][56]62] are cited in the supplementary materials. Institutional Review Board Statement: Not applicable.…”

Section: Supplementary Materialsmentioning

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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“…[13][14][15][16][17][18][19] In particular, manganese oxide (MnO 2 ) has become a widely-used agent for treating different kinds of organic dyes because of its high stability, good environmental compatibility, and variable valence. [20][21][22][23] On the other hand, for oxidative degradation, the degradation efficiency of organic pollutants largely depends on the degree of the pollutants close to the surface of active metal oxides. However, MnO 2 particles prepared by traditional methods such as the hydrothermal method and coprecipitation have low specic surface areas, which seriously reduces their actual efficiency in the treatment of organic pollutants in water.…”

Section: Introductionmentioning

confidence: 99%

Urchin-like hollow SiO₂@γ-MnO₂ microparticles for the rapid degradation of organic dyes

Zhang

et al. 2022

RSC Adv.

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α-MnO2 nanotube@δ-MnO2 nanoflake hierarchical structure on three-dimensional graphene foam as a lightweight and free-standing supercapacitor electrode

Cited by 22 publications

References 48 publications

Nano Carbon/Vertical Graphene/MnO₂ Nanosheets Composite Particles for High‐Performance Supercapacitors

Nano Carbon/Vertical Graphene/MnO₂ Nanosheets Composite Particles for High‐Performance Supercapacitors

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

Urchin-like hollow SiO₂@γ-MnO₂ microparticles for the rapid degradation of organic dyes

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α-MnO2 nanotube@δ-MnO2 nanoflake hierarchical structure on three-dimensional graphene foam as a lightweight and free-standing supercapacitor electrode

Cited by 22 publications

References 48 publications

Nano Carbon/Vertical Graphene/MnO2 Nanosheets Composite Particles for High‐Performance Supercapacitors

Nano Carbon/Vertical Graphene/MnO2 Nanosheets Composite Particles for High‐Performance Supercapacitors

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

Urchin-like hollow SiO2@γ-MnO2 microparticles for the rapid degradation of organic dyes

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Product

Resources

About

Nano Carbon/Vertical Graphene/MnO₂ Nanosheets Composite Particles for High‐Performance Supercapacitors

Nano Carbon/Vertical Graphene/MnO₂ Nanosheets Composite Particles for High‐Performance Supercapacitors

Urchin-like hollow SiO₂@γ-MnO₂ microparticles for the rapid degradation of organic dyes