Boosting the performance of supercapacitors based hierarchically porous carbon from natural Juncus effuses by incorporation of MnO2

Ping, Yunjie; Liu, Zhe; Li, Jingjing; Han, Jinzhao; Yang, Yue; Xiong, Bangyun; Fang, Pengfei; He, Chunqing

doi:10.1016/j.jallcom.2019.07.125

Cited by 34 publications

(7 citation statements)

References 41 publications

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“…The energy and power densities of the supercapacitor are also calculated, and the results are summarized as the Ragone plot in Figure 7e. The energy density is calculated as 54 Wh kg −1 at the power density of 181 W kg −1 , which outperforms the recently reported MnO 2 ‐based symmetric supercapacitors [ 62–69 ] and is even higher than the advanced asymmetric supercapacitors in literature. [ 70–74 ] Even at a high power density of 2.08 kW kg −1 , the device can still achieve an energy density of 8.829 Wh kg −1 .…”

Section: Resultsmentioning

confidence: 57%

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: Resultsmentioning

confidence: 57%

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

Lin

Zhao

et al. 2022

Energy Tech

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“…Recent studies have shown that 3D hierarchical nanostructured carbons are promising candidates as substrates of nanoscaled MnO 2 accumulation to fabricate hybrid composites [ 25 , 26 ] because of their unique internal porous structures. For example, 3D graphene foam [ 27 ], carbon nanotube sponges [ 28 ], hierarchical porous carbon (HPC) [ 29 , 30 ], and hierarchical hybrid nanostructures [ 31 , 32 ] have been developed. Despite these achievements, it is also desirable to develop simple and scalable methods to synthesize MnO 2 /HPC composites.…”

Section: Introductionmentioning

confidence: 99%

“…HPCs are usually prepared from polymer precursors using template-assisted methods. In recent years, a lot of waste materials and biomass resources such as plant fibers [ 30 , 33 ], animal tissues [ 34 ], or industry waste [ 35 ] have been transformed into HPCs by their self-structuring procedure. Obviously, the high value-added utilization of worthless and renewable material is beneficial to both environmental protection and sustainable development [ 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge

Han

Gong³

et al. 2021

Nanomaterials

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In the aim to go beyond the performance tradeoffs of classic electric double-layer capacitance and pseudo-capacitance, composites made out of carbon and pseudo-capacitive materials have been a hot-spot strategy. In this paper, a nest-like MnO2 nanowire/hierarchical porous carbon (HPC) composite (MPC) was successfully fabricated by a controllable in situ chemical co-precipitation method from oily sludge waste. Due to the advantages of high surface area and fast charge transfer for HPC as well as the large pseudo-capacitance for MnO2 nanowires, the as-prepared MPC has good capacitance performance with a specific capacitance of 437.9 F g−1 at 0.5 A g−1, favorable rate capability of 79.2% retention at 20 A g−1, and long-term cycle stability of 78.5% retention after 5000 cycles at 5 A g−1. Meanwhile, an asymmetric supercapacitor (ASC) was assembled using MPC as the cathode while HPC was the anode, which exhibits a superior energy density of 58.67 W h kg−1 at the corresponding power density of 498.8 W kg−1. These extraordinary electrochemical properties highlight the prospect of our waste-derived composites electrode material to replace conventional electrode materials for a high-performance supercapacitor.

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“…Recently, carbon-based materials with an excellent conductivity and ultrastability (representing EDLCs performance) have been hybridized with MnO 2 (the representing pseudocapacitive performance). This allowed overcoming the limitations of each material by making full use of their advantages due to the synergistic effects between those two types of SCs [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Surfactant-assisted microwave synthesis of carbon supported MnO2 nanocomposites and their application for electrochemical supercapacitors

Jablonskienė¹,

Šimkūnaitė²,

Vaičiūnienė³

et al. 2020

chemija

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MnO2/C nanocomposites have been prepared using a simple onestep microwave heating method by applying different concentrations of cationic surfactant – cetyl trimethylammonium bromide (CTAB). The morphology and composition of the prepared MnO2/C nanocomposites have been investigated using X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and inductively coupled plasma optical emission spectroscopy (ICP-OES). The electrochemical performance of the prepared nanocomposites has been analysed using cyclic voltammetry. It was found that a high specific capacitance (Cs) of 742 F g−1 at a scan rate of 10 mV s−1 in a 1 M Na2SO4 solution has been obtained for the MnO2/C nanocomposite that has the mass loading of 0.140 mg cm−2 and has been synthesized in the absence of CTAB. Meanwhile, the application of CTAB allowed the increase in the mass loading of MnO2 in the nanocomposites. In the presence of CTAB, the highest value of 654 F g−1 at a scan rate of 10 mV s−1 has been obtained for MnO2/C that has the mass loading of 0.570 mg cm−2. This result confirmed a good performance of the prepared MnO2/C nanocomposites as the electrode material for supercapacitors.

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Boosting the performance of supercapacitors based hierarchically porous carbon from natural Juncus effuses by incorporation of MnO2

Cited by 34 publications

References 41 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

Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge

Surfactant-assisted microwave synthesis of carbon supported MnO2 nanocomposites and their application for electrochemical supercapacitors

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Boosting the performance of supercapacitors based hierarchically porous carbon from natural Juncus effuses by incorporation of MnO2

Cited by 34 publications

References 41 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

Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge

Surfactant-assisted microwave synthesis of carbon supported MnO2 nanocomposites and their application for electrochemical supercapacitors

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

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