Hierarchical porous graphitic carbon for high-performance supercapacitors at high temperature

Lithium-ion capacitors (LICs) have been widely explored for energy storage. Nevertheless, achieving good energy density, satisfactory power density, and stable cycle life is still challenging. For this study, we fabricated a novel LIC with a NiO-rGO composite as a negative material and commercial activated carbon (AC) as a positive material for energy storage. The NiO-rGO//AC system utilizes NiO nanoparticles uniformly distributed in rGO to achieve a high specific capacity (with a current density of 0.5 A g−1 and a charge capacity of 945.8 mA h g−1) and uses AC to provide a large specific surface area and adjustable pore structure, thereby achieving excellent electrochemical performance. In detail, the NiO-rGO//AC system (with a mass ratio of 1:3) can achieve a high energy density (98.15 W h kg−1), a high power density (10.94 kW kg−1), and a long cycle life (with 72.1% capacity retention after 10,000 cycles). This study outlines a new option for the manufacture of LIC devices that feature both high energy and high power densities.

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In situ construction of yolk–shell zinc cobaltite with uniform carbon doping for high performance asymmetric supercapacitors

Journal of Materials Chemistry A ◽

10.1039/c8ta01759j ◽

2018 ◽

Vol 6 (19) ◽

pp. 9109-9115 ◽

Cited By ~ 31

Author(s):

Xiaoya Chang ◽

Lei Zang ◽

Song Liu ◽

Mengying Wang ◽

Huinan Guo ◽

...

Keyword(s):

Energy Density ◽

Power Density ◽

High Performance ◽

High Energy ◽

Carbon Doping ◽

High Energy Density ◽

Asymmetric Supercapacitors

Yolk–shell ZnCo2O4 with in situ formed carbon shows great potential for supercapacitors, which delivers high energy density and power density.

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High-Performance Asymmetric Supercapacitors Based on the Ni1.5Co1.5S4@CNTs Nanocomposites

NANO ◽

10.1142/s1793292020501362 ◽

2020 ◽

Vol 15 (10) ◽

pp. 2050136

Author(s):

Xuan Zheng ◽

Xingxing He ◽

Jinlong Jiang ◽

Zhengfeng Jia ◽

Yu Li ◽

...

Keyword(s):

Energy Density ◽

Power Density ◽

High Performance ◽

Specific Capacity ◽

Negative Electrode ◽

High Energy ◽

Cycling Stability ◽

Power Delivery ◽

High Energy Density ◽

Practical Applications

In this paper, the Ni[Formula: see text]Co[Formula: see text]S4@CNTs nanocomposites containing different carbon nanotubes (CNT) content were prepared by a one-step hydrothermal method. More hydroxyl and carboxyl groups were introduced on the surface of CNTs by acidizing treatment to increase the dispersion of CNTs. The acid-treated CNTs can more fully compound with Ni[Formula: see text]Co[Formula: see text]S4 nanoparticles to form heterostructure. When the CNTs content is 10[Formula: see text]wt.%, the Ni[Formula: see text]Co[Formula: see text]S4@CNTs-10 nanocomposite exhibits the highest specific capacity of 210[Formula: see text]mAh[Formula: see text]g[Formula: see text] in KOH aqueous electrolytes at current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text]. The superior performances of the Ni[Formula: see text]Co[Formula: see text]S4@CNTs-10 nanocomposite are attributed to the effective synergic effects of the high specific capacity of Ni[Formula: see text]Co[Formula: see text]S4 and the excellent conductivity of CNTs. An asymmetric supercapacitor (ASC) was assembled based on Ni[Formula: see text]Co[Formula: see text]S4@CNTs-10 positive electrode and activated carbon (AC) negative electrode, which delivers a high energy density of 61.2[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at a power density of 800[Formula: see text]W[Formula: see text]kg[Formula: see text], and maintains 34.8[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at a power density of 16079[Formula: see text]W[Formula: see text]kg[Formula: see text]. Also, the ASC device shows an excellent cycling stability with 91.49% capacity retention and above 94% Columbic efficiency after 10 000 cycles at 10[Formula: see text]A[Formula: see text]g[Formula: see text]. This aqueous asymmetric Ni[Formula: see text]Co[Formula: see text]S4@CNTs//AC supercapacitor is promising for practical applications due to its advantages such as high energy density, power delivery and cycling stability.

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Construction of highly dispersed mesoporous bimetallic-sulfide nanoparticles locked in N-doped graphitic carbon nanosheets for high energy density hybrid flexible pseudocapacitors

Journal of Materials Chemistry A ◽

10.1039/c9ta05180e ◽

2019 ◽

Vol 7 (29) ◽

pp. 17435-17445 ◽

Cited By ~ 22

Author(s):

Muhammad Sufyan Javed ◽

Hang Lei ◽

Jinliang Li ◽

Zilong Wang ◽

Wenjie Mai

Keyword(s):

Energy Density ◽

Power Density ◽

High Energy ◽

Graphitic Carbon ◽

High Energy Density ◽

Ultrahigh Energy ◽

Carbon Nanosheets ◽

Highly Dispersed ◽

Bimetallic Sulfide ◽

High Flexibility

The as-fabricated ZCS//MPC-ASC device delivered the ultrahigh energy density of 92.59 W h kg−1 at the power density of 846.02 W kg−1 with high flexibility.

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Facile Synthesis of FeS@C Particles Toward High-Performance Anodes for Lithium-Ion Batteries

Nanomaterials ◽

10.3390/nano9101467 ◽

2019 ◽

Vol 9 (10) ◽

pp. 1467

Author(s):

Xuanni Lin ◽

Zhuoyi Yang ◽

Anru Guo ◽

Dong Liu

Keyword(s):

Energy Density ◽

Electrochemical Performance ◽

Lithium Ion Batteries ◽

High Performance ◽

High Current Density ◽

Specific Capacity ◽

Lithium Ion ◽

High Energy ◽

High Energy Density ◽

Hierarchical Porous

High energy density batteries with high performance are significantly important for intelligent electrical vehicular systems. Iron sulfurs are recognized as one of the most promising anodes for high energy density lithium-ion batteries because of their high theoretical specific capacity and relatively stable electrochemical performance. However, their large-scale commercialized application for lithium-ion batteries are plagued by high-cost and complicated preparation methods. Here, we report a simple and cost-effective method for the scalable synthesis of nanoconfined FeS in porous carbon (defined as FeS@C) as anodes by direct pyrolysis of an iron(III) p-toluenesulfonate precursor. The carbon architecture embedded with FeS nanoparticles provides a rapid electron transport property, and its hierarchical porous structure effectively enhances the ion transport rate, thereby leading to a good electrochemical performance. The resultant FeS@C anodes exhibit high reversible capacity and long cycle life up to 500 cycles at high current density. This work provides a simple strategy for the mass production of FeS@C particles, which represents a critical step forward toward practical applications of iron sulfurs anodes.

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Blow-spun N-doped carbon fiber based high performance flexible lithium ion capacitors

RSC Advances ◽

10.1039/c9ra10348a ◽

2020 ◽

Vol 10 (17) ◽

pp. 9833-9839

Author(s):

Changzhen Zhan ◽

Jianan Song ◽

Xiaolong Ren ◽

Yang Shen ◽

Hui Wu ◽

...

Keyword(s):

Carbon Fiber ◽

Energy Density ◽

Power Density ◽

High Power ◽

High Performance ◽

Lithium Ion ◽

High Energy ◽

High Energy Density ◽

High Power Density ◽

Hybrid Supercapacitors

Constructing flexible hybrid supercapacitors is a feasible way to achieve devices with high energy density, high power density and flexibility at the same time.

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Highly porous graphitic carbon and Ni2P2O7 for a high performance aqueous hybrid supercapacitor

Journal of Materials Chemistry A ◽

10.1039/c5ta04737d ◽

2015 ◽

Vol 3 (43) ◽

pp. 21553-21561 ◽

Cited By ~ 106

Author(s):

Baskar Senthilkumar ◽

Ziyauddin Khan ◽

Seungyoung Park ◽

Kyoungho Kim ◽

Hyunhyub Ko ◽

...

Keyword(s):

Energy Density ◽

High Performance ◽

Rate Capability ◽

High Energy ◽

Maximum Energy ◽

Porous Graphitic Carbon ◽

Graphitic Carbon ◽

Hybrid Supercapacitor ◽

Highly Porous ◽

Good Rate Capability

A high energy hybrid capacitor fabricated from highly porous graphitic carbon and novel electrode material Ni2P2O7 delivers a maximum energy density of 65 W h kg−1 at a power density of 800 W kg−1, good rate capability and cycling stability in an aqueous Na-ion based electrolyte.

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Nitrogen-Doped Hierarchical Porous Activated Carbon Derived from Paddy for High-Performance Supercapacitors

Materials ◽

10.3390/ma14020318 ◽

2021 ◽

Vol 14 (2) ◽

pp. 318

Author(s):

Yudan Yuan ◽

Yi Sun ◽

Zhichen Feng ◽

Xingjian Li ◽

Ruowei Yi ◽

...

Keyword(s):

Activated Carbon ◽

Energy Density ◽

Specific Capacitance ◽

High Performance ◽

High Energy ◽

High Energy Density ◽

Scale Production ◽

Nitrogen Doped ◽

Hierarchical Porous ◽

Porous Activated Carbon

A facile and environmentally friendly fabrication is proposed to prepare nitrogen-doped hierarchical porous activated carbon via normal-pressure popping, one-pot activation and nitrogen-doping process. The method adopts paddy as carbon precursor, KHCO3 and dicyandiamide as the safe activating agent and nitrogen dopant. The as-prepared activated carbon presents a large specific surface area of 3025 m2·g−1 resulting from the synergistic effect of KHCO3 and dicyandiamide. As an electrode material, it shows a maximum specific capacitance of 417 F·g−1 at a current density of 1 A·g−1 and very good rate performance. Furthermore, the assembled symmetric supercapacitor presents a large specific capacitance of 314.6 F·g−1 and a high energy density of 15.7 Wh·Kg−1 at 1 A·g−1, maintaining 14.4 Wh·Kg−1 even at 20 A·g−1 with the energy density retention of 91.7%. This research demonstrates that nitrogen-doped hierarchical porous activated carbon derived from paddy has a significant potential for developing a high-performance renewable supercapacitor and provides a new route for economical and large-scale production in supercapacitor application.

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High Energy-Density Supercapacitor, Enabled by Carbon Nanostructures

10.1149/osf.io/b3ec4 ◽

2020 ◽

Author(s):

Christopher Scott Carley ◽

Danny J. Espinoza ◽

José Luis Reyes-Rodríguez ◽

Ethan C. Ahn

Keyword(s):

Energy Density ◽

Power Density ◽

Carbon Nanostructures ◽

High Performance ◽

Renewable Energy Sources ◽

Lithium Ion ◽

High Energy ◽

Experimental Methodology ◽

High Energy Density ◽

Energy Storage Devices

The rapidly increasing demand for renewable energy sources has revived interest in energy storage devices due to the intermittent nature of energy generated from these sources (e.g., solar, wind). Compared to lithium-ion batteries and hydrogen fuel cells, supercapacitors exhibit superior power-density (W/kg), enabling fast charging/discharging cycles. Although supercapacitors generally promise long life-cycle and a robust thermal operating range, a relatively low energy-density (Wh/kg) still remains the greatest challenge. This research presents a relatively simple, low-cost experimental methodology to develop all solid-state, flexible, and high-performance supercapacitor devices. The interdigitated electrodes will consist of two different types of solution-processable carbon nanostructures – namely, reduced graphene oxide (rGO) and single-walled carbon nanotube (SWCNT). We developed models to better guide the experimental work while predicting the power-density and energy-density characteristics of supercapacitors with varying physical dimensions.

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