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Ching-ping Wong - One of the best experts on this subject based on the ideXlab platform.

  • Robust vertically aligned Carbon nanotube–Carbon Fiber Paper hybrid as versatile electrodes for supercapacitors and capacitive deionization
    Carbon, 2013
    Co-Authors: Ziyin Lin, Kyoung-sik Moon, Yunnan Fang, Yagang Yao, Ching-ping Wong
    Abstract:

    Abstract We developed a facile method to transfer vertically aligned Carbon nanotubes (VACNT) onto a Carbon Fiber Paper (CFP) substrate using silicone as an adhesion layer. The resulting VACNT–CFP hybrid structure displays a very low interface resistance of 0.006 Ω as a result of the Van der Waals interaction at the VACNT–CFP interface. We demonstrated in this work that the VACNT–CFP can be used as a supercapacitor electrode with excellent rate performance and cycling stability, which could be attributed to the vertically alignment and chemical stability of CNTs in the hybrid structure. Further, we found that VACNT–CFP showed good resistance to the impact of flowing water when tested as a capacitive deionizer electrode, owing to superior mechanical robustness of the hybrid structure.

  • robust vertically aligned Carbon nanotube Carbon Fiber Paper hybrid as versatile electrodes for supercapacitors and capacitive deionization
    Carbon, 2013
    Co-Authors: Ziyin Lin, Kyoung-sik Moon, Yunnan Fang, Yagang Yao, Ching-ping Wong
    Abstract:

    Abstract We developed a facile method to transfer vertically aligned Carbon nanotubes (VACNT) onto a Carbon Fiber Paper (CFP) substrate using silicone as an adhesion layer. The resulting VACNT–CFP hybrid structure displays a very low interface resistance of 0.006 Ω as a result of the Van der Waals interaction at the VACNT–CFP interface. We demonstrated in this work that the VACNT–CFP can be used as a supercapacitor electrode with excellent rate performance and cycling stability, which could be attributed to the vertically alignment and chemical stability of CNTs in the hybrid structure. Further, we found that VACNT–CFP showed good resistance to the impact of flowing water when tested as a capacitive deionizer electrode, owing to superior mechanical robustness of the hybrid structure.

Gengchao Wang - One of the best experts on this subject based on the ideXlab platform.

  • A novel asymmetric supercapacitors based on binder-free Carbon Fiber Paper@ nickel cobaltite nanowires and graphene foam electrodes
    Journal of Power Sources, 2014
    Co-Authors: Qianqiu Tang, Mingming Chen, Le Wang, Gengchao Wang
    Abstract:

    Abstract Aqueous-based asymmetric supercapacitors (AASCs) provide an effective way to improve the energy density of the device by broadening the operating voltage window. In this work, nickel cobaltite (NiCo 2 O 4 ) nanowires are grown homogenously on Carbon Fiber Paper (CFP) to obtain a binder-free CFP@NiCo 2 O 4 positive electrode through a simple hydrothermal method followed by calcination. The highly porous graphene foam (GF) as negative electrode which also exhibits self-supporting structure is prepared by a facile mild reduction process. Taking advantages of the complementary voltage window of CFP@NiCo 2 O 4 and GF, the as-fabricated CFP@NiCo 2 O 4 //GF AASC obtains a stable working voltage window of 1.6 V, and a high energy density of 34.5 Wh kg −1 at the power density of 547 W kg −1 , which still maintains 17.1 Wh kg −1 at 9.68 kW kg −1 . Furthermore, it exhibits superior cycling performance with 92.2% capacitance retention rate after 10000 cycles.

  • all solid state asymmetric supercapacitor based on reduced graphene oxide Carbon nanotube and Carbon Fiber Paper polypyrrole electrodes
    Journal of Materials Chemistry, 2014
    Co-Authors: Chongyang Yang, Jiali Shen, Chunyan Wang, Haojie Fei, Hua Bao, Gengchao Wang
    Abstract:

    Sandwich-like reduced graphene oxide/carboxylated multi-walled Carbon nanotube (RGO/cMWCNT) hybrid film and the Carbon Fiber Paper-supported polypyrrole (CFP/PPy) composite film were prepared by a vacuum-infiltration process and an electrochemical deposition method, respectively. Furthermore, a novel all-solid-state asymmetric supercapacitor (ASC) was fabricated using RGO/cMWCNT as the negative electrode and CFP/PPy as the positive electrode, separated with potassium polyacrylate/KCl gel electrolyte. Due to the unique structure, stable potential window and good capacitive performance of the two electrodes, the as-fabricated ASC can be cycled reversibly at a cell voltage of 1.6 V and displays outstanding performances with an energy density of 28.6 W h kg−1 and a power density of 15.1 kW kg−1. Additionally, our ASC device also presents a superior long cycle life with 93% capacitance retention after 2000 cycles.

  • All-solid-state asymmetric supercapacitor based on reduced graphene oxide/Carbon nanotube and Carbon Fiber Paper/polypyrrole electrodes
    Journal of Materials Chemistry, 2013
    Co-Authors: Chongyang Yang, Jiali Shen, Chunyan Wang, Haojie Fei, Hua Bao, Gengchao Wang
    Abstract:

    Sandwich-like reduced graphene oxide/carboxylated multi-walled Carbon nanotube (RGO/cMWCNT) hybrid film and the Carbon Fiber Paper-supported polypyrrole (CFP/PPy) composite film were prepared by a vacuum-infiltration process and an electrochemical deposition method, respectively. Furthermore, a novel all-solid-state asymmetric supercapacitor (ASC) was fabricated using RGO/cMWCNT as the negative electrode and CFP/PPy as the positive electrode, separated with potassium polyacrylate/KCl gel electrolyte. Due to the unique structure, stable potential window and good capacitive performance of the two electrodes, the as-fabricated ASC can be cycled reversibly at a cell voltage of 1.6 V and displays outstanding performances with an energy density of 28.6 W h kg−1 and a power density of 15.1 kW kg−1. Additionally, our ASC device also presents a superior long cycle life with 93% capacitance retention after 2000 cycles.

Meilin Liu - One of the best experts on this subject based on the ideXlab platform.

  • Porous Functionalized Self-Standing Carbon Fiber Paper Electrodes for High-Performance Capacitive Energy Storage.
    ACS Applied Materials & Interfaces, 2017
    Co-Authors: Yuanyuan Zhu, Shuang Cheng, Weijia Zhou, Jin Jia, Lufeng Yang, Minghai Yao, Mengkun Wang, Haowei Luo, Meilin Liu
    Abstract:

    A facile and cost-efficient approach to functionalize raw Carbon Fiber Paper (CFP) used for a self-standing capacitive electrode has been proposed here. Benefiting from the improved specific surface area and surface functional groups, the functionalized CFP (F-CFP) showed much enhanced capacitive performance, 3 orders of magnitude higher than that of the raw CFP. It delivered the areal capacitance of 1275 mF cm–2 at 5 mA cm–2 with a rather wide voltage window of 1.4 V (−0.4 to 1 V vs Ag/AgCl) in 0.5 M H2SO4. However, in a neutral 1 M Na2SO4 aqueous solution, although the areal capacitance of 1115 mF cm–2 at 3 mA cm–2 is slightly smaller, the potential window is much wider (2 V, −1 to 1 V vs Ag/AgCl), indicating a high overpotential of hydrogen evolution. The areal capacitance was still as high as 722 mF cm–2 at a very fast charge–discharge current density of 50 mA cm–2, and about 66% of the initial capacitance (at 3 mA cm–2) was remained in Na2SO4, indicating considerable rate capability.

  • Nickel–Cobalt Hydroxide Nanosheets Coated on NiCo2O4 Nanowires Grown on Carbon Fiber Paper for High-Performance Pseudocapacitors
    Nano Letters, 2013
    Co-Authors: Liang Huang, Dongchang Chen, Yong Ding, Zhong Lin Wang, Shi Feng, Meilin Liu
    Abstract:

    A series of flexible nanocomposite electrodes were fabricated by facile electro-deposition of cobalt and nickel double hydroxide (DH) nanosheets on porous NiCo2O4 nanowires grown radially on Carbon Fiber Paper (CFP) for high capacity, high energy, and power density supercapacitors. Among different stoichiometries of CoxNi1–xDH nanosheets studied, Co0.67Ni0.33 DHs/NiCo2O4/CFP hybrid nanoarchitecture showed the best cycling stability while maintaining high capacitance of ∼1.64 F/cm2 at 2 mA/cm2. This hybrid composite electrode also exhibited excellent rate capability; the areal capacitance decreased less than 33% as the current density was increased from 2 to 90 mA/cm2, offering excellent specific energy density (∼33 Wh/kg) and power density (∼41.25 kW/kg) at high cycling rates (up to150 mA/cm2).

  • Carbon Fiber Paper supported hybrid nanonet/nanoflower nickel oxide electrodes for high-performance pseudo-capacitors
    Journal of Materials Chemistry, 2013
    Co-Authors: Shuang Cheng, Lei Yang, Yong Liu, Wei Lin, Liang Huang, Dongchang Chen, C.p. Wong, Meilin Liu
    Abstract:

    A composite electrode consisting of hybrid nanonet/nanoflower NiO deposited on Carbon Fiber Paper scaffolds demonstrates a much-improved areal capacitance (0.93 F cm−2) while maintaining high rate capability and excellent cycling life. These performance characteristics are attributed to the unique electrode architecture and the nanostructures of NiO. While the nanonet NiO with a high surface area greatly facilitates the redox reactions for charge storage, the porous nanoflowers further extend the active sites for the redox reactions, leading to fast Faradic reactions for efficient energy storage.

  • Carbon Fiber Paper supported hybrid nanonet nanoflower nickel oxide electrodes for high performance pseudo capacitors
    Journal of Materials Chemistry, 2013
    Co-Authors: Shuang Cheng, Lei Yang, Yong Liu, Wei Lin, Liang Huang, Dongchang Chen, C.p. Wong, Meilin Liu
    Abstract:

    A composite electrode consisting of hybrid nanonet/nanoflower NiO deposited on Carbon Fiber Paper scaffolds demonstrates a much-improved areal capacitance (0.93 F cm−2) while maintaining high rate capability and excellent cycling life. These performance characteristics are attributed to the unique electrode architecture and the nanostructures of NiO. While the nanonet NiO with a high surface area greatly facilitates the redox reactions for charge storage, the porous nanoflowers further extend the active sites for the redox reactions, leading to fast Faradic reactions for efficient energy storage.

Dongchang Chen - One of the best experts on this subject based on the ideXlab platform.

  • controlled synthesis of nico2s4 nanostructured arrays on Carbon Fiber Paper for high performance pseudocapacitors
    Nano Energy, 2015
    Co-Authors: Dongchang Chen, Xunhui Xiong, Gordon Henry Waller, Dong Ding, Ben H Rainwater, Bote Zhao, Zhixing Wang
    Abstract:

    Abstract A facile hydrothermal method is utilized to produce nanostructured NiCo2S4 arrays on Carbon Fiber Paper with controlled morphologies to study the effect of morphology on their electrochemical performance in supercapacitors. Specifically, NiCo2S4 solid nanoFiber, nanotube, and hollow nanoneedle of the same crystalline structure are synthesized by controlling the conditions of the hydrothermal synthesis. Among the three different morphologies studied, the hollow nanoneedle of NiCo2S4 shows the highest capacity and the longest cycling life, demonstrating a specific capacitance of ~1154 F g−1 at a charge–discharge current density of 1 A g−1 and negligible capacity loss after 8000 cycles (at a rate of 10 A g−1). This high performance is attributed to the unique nanostructure of the hollow nanoneedle, suggesting that the morphology of NiCo2S4 plays a vital role in determining the electrochemical performance. Further, an asymmetric capacitor consisting of NiCo2S4 hollow nanoneedle electrode and a tape-cast activated Carbon film electrode achieves an energy density of ~17.3 Wh kg−1 at 1 A g−1 and a power density of ~0.2 kW kg−1 at 20 A g−1 in a voltage range of 0–1.5 V, implying that it has a great potential for a wide variety of practical applications.

  • hybrid composite ni oh 2 nico2o4 grown on Carbon Fiber Paper for high performance supercapacitors
    ACS Applied Materials & Interfaces, 2013
    Co-Authors: Liang Huang, Dongchang Chen, Yong Ding, Zhong Lin Wang, Zhengzhi Zeng
    Abstract:

    We have successfully fabricated and tested the electrochemical performance of supercapacitor electrodes consisting of Ni(OH)2 nanosheets coated on NiCo2O4 nanosheets grown on Carbon Fiber Paper (CFP) current collectors. When the NiCo2O4 nanosheets are replaced by Co3O4 nanosheets, however, the energy and power density as well as the rate capability of the electrodes are significantly reduced, most likely due to the lower conductivity of Co3O4 than that of NiCo2O4. The 3D hybrid composite Ni(OH)2/NiCo2O4/CFP electrodes demonstrate a high areal capacitance of 5.2 F/cm2 at a cycling current density of 2 mA/cm2, with a capacitance retention of 79% as the cycling current density was increased from 2 to 50 mA/cm2. The remarkable performance of these hybrid composite electrodes implies that supercapacitors based on them have potential for many practical applications.

  • nickel cobalt hydroxide nanosheets coated on nico2o4 nanowires grown on Carbon Fiber Paper for high performance pseudocapacitors
    Nano Letters, 2013
    Co-Authors: Liang Huang, Dongchang Chen, Yong Ding, Shi Feng, Zhong Lin Wang
    Abstract:

    A series of flexible nanocomposite electrodes were fabricated by facile electro-deposition of cobalt and nickel double hydroxide (DH) nanosheets on porous NiCo2O4 nanowires grown radially on Carbon Fiber Paper (CFP) for high capacity, high energy, and power density supercapacitors. Among different stoichiometries of CoxNi1–xDH nanosheets studied, Co0.67Ni0.33 DHs/NiCo2O4/CFP hybrid nanoarchitecture showed the best cycling stability while maintaining high capacitance of ∼1.64 F/cm2 at 2 mA/cm2. This hybrid composite electrode also exhibited excellent rate capability; the areal capacitance decreased less than 33% as the current density was increased from 2 to 90 mA/cm2, offering excellent specific energy density (∼33 Wh/kg) and power density (∼41.25 kW/kg) at high cycling rates (up to150 mA/cm2).

  • Nickel–Cobalt Hydroxide Nanosheets Coated on NiCo2O4 Nanowires Grown on Carbon Fiber Paper for High-Performance Pseudocapacitors
    Nano Letters, 2013
    Co-Authors: Liang Huang, Dongchang Chen, Yong Ding, Zhong Lin Wang, Shi Feng, Meilin Liu
    Abstract:

    A series of flexible nanocomposite electrodes were fabricated by facile electro-deposition of cobalt and nickel double hydroxide (DH) nanosheets on porous NiCo2O4 nanowires grown radially on Carbon Fiber Paper (CFP) for high capacity, high energy, and power density supercapacitors. Among different stoichiometries of CoxNi1–xDH nanosheets studied, Co0.67Ni0.33 DHs/NiCo2O4/CFP hybrid nanoarchitecture showed the best cycling stability while maintaining high capacitance of ∼1.64 F/cm2 at 2 mA/cm2. This hybrid composite electrode also exhibited excellent rate capability; the areal capacitance decreased less than 33% as the current density was increased from 2 to 90 mA/cm2, offering excellent specific energy density (∼33 Wh/kg) and power density (∼41.25 kW/kg) at high cycling rates (up to150 mA/cm2).

  • Carbon Fiber Paper supported hybrid nanonet/nanoflower nickel oxide electrodes for high-performance pseudo-capacitors
    Journal of Materials Chemistry, 2013
    Co-Authors: Shuang Cheng, Lei Yang, Yong Liu, Wei Lin, Liang Huang, Dongchang Chen, C.p. Wong, Meilin Liu
    Abstract:

    A composite electrode consisting of hybrid nanonet/nanoflower NiO deposited on Carbon Fiber Paper scaffolds demonstrates a much-improved areal capacitance (0.93 F cm−2) while maintaining high rate capability and excellent cycling life. These performance characteristics are attributed to the unique electrode architecture and the nanostructures of NiO. While the nanonet NiO with a high surface area greatly facilitates the redox reactions for charge storage, the porous nanoflowers further extend the active sites for the redox reactions, leading to fast Faradic reactions for efficient energy storage.

Chongyang Yang - One of the best experts on this subject based on the ideXlab platform.

  • all solid state asymmetric supercapacitor based on reduced graphene oxide Carbon nanotube and Carbon Fiber Paper polypyrrole electrodes
    Journal of Materials Chemistry, 2014
    Co-Authors: Chongyang Yang, Jiali Shen, Chunyan Wang, Haojie Fei, Hua Bao, Gengchao Wang
    Abstract:

    Sandwich-like reduced graphene oxide/carboxylated multi-walled Carbon nanotube (RGO/cMWCNT) hybrid film and the Carbon Fiber Paper-supported polypyrrole (CFP/PPy) composite film were prepared by a vacuum-infiltration process and an electrochemical deposition method, respectively. Furthermore, a novel all-solid-state asymmetric supercapacitor (ASC) was fabricated using RGO/cMWCNT as the negative electrode and CFP/PPy as the positive electrode, separated with potassium polyacrylate/KCl gel electrolyte. Due to the unique structure, stable potential window and good capacitive performance of the two electrodes, the as-fabricated ASC can be cycled reversibly at a cell voltage of 1.6 V and displays outstanding performances with an energy density of 28.6 W h kg−1 and a power density of 15.1 kW kg−1. Additionally, our ASC device also presents a superior long cycle life with 93% capacitance retention after 2000 cycles.

  • All-solid-state asymmetric supercapacitor based on reduced graphene oxide/Carbon nanotube and Carbon Fiber Paper/polypyrrole electrodes
    Journal of Materials Chemistry, 2013
    Co-Authors: Chongyang Yang, Jiali Shen, Chunyan Wang, Haojie Fei, Hua Bao, Gengchao Wang
    Abstract:

    Sandwich-like reduced graphene oxide/carboxylated multi-walled Carbon nanotube (RGO/cMWCNT) hybrid film and the Carbon Fiber Paper-supported polypyrrole (CFP/PPy) composite film were prepared by a vacuum-infiltration process and an electrochemical deposition method, respectively. Furthermore, a novel all-solid-state asymmetric supercapacitor (ASC) was fabricated using RGO/cMWCNT as the negative electrode and CFP/PPy as the positive electrode, separated with potassium polyacrylate/KCl gel electrolyte. Due to the unique structure, stable potential window and good capacitive performance of the two electrodes, the as-fabricated ASC can be cycled reversibly at a cell voltage of 1.6 V and displays outstanding performances with an energy density of 28.6 W h kg−1 and a power density of 15.1 kW kg−1. Additionally, our ASC device also presents a superior long cycle life with 93% capacitance retention after 2000 cycles.