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Alternating Voltage

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Mingjun Jing – One of the best experts on this subject based on the ideXlab platform.

  • Nitrogen-Doped Graphene via In-situ Alternating Voltage Electrochemical Exfoliation for Supercapacitor Application.
    Frontiers in Chemistry, 2020
    Co-Authors: Mingjun Jing, Yazheng Zhou, Yong Liu

    Abstract:

    Doping heteroatom, an effective way to enhance the electrochemical performances of graphene, has received wide attention, especially related to nitrogen. Alternating Voltage electrochemical exfoliation, as a low cost and green electrochemical approach, has been developed to construct in-situ N-doped graphene (N-Gh) material. The N-Gh presents a much higher capacity than that of pure graphene prepared via the same method, which might be attributed to the introduction of nitrogen, which has much more effects and a disordered structure. As-prepared N-Gh exhibits a low O/C ratio that is helpful in maintaining high electrical conductivity. And the effects and disorder structure are also conductive to reduce the overlaps of graphene layers. A symmetric supercapacitor assembled with N-Gh electrodes displays a satisfactory rate behavior and long cycling stability (92.3% retention after 5,000 cycles).

  • Alternating Voltage induced electrochemical synthesis of three-dimensionalization copper oxide for lithium-ion battery application
    Chemical Physics Letters, 2016
    Co-Authors: Mingjun Jing, Hongshuai Hou, Yan Zhang, Zhiying Ding, Guoqiang Zou

    Abstract:

    Abstract Three-dimensional copper oxide structures composed of single crystal nanosheets have been successfully prepared by a green electrochemical Alternating Voltage approach. This special structure of copper oxide grown along the [0 1 0] direction can be effective to accommodate the volume expansion during charge–discharge cycles. The obtained product as anode materials in lithium-ion batteries displays outstanding electrochemical performances with a high reversible capacity of 635.2 mA h g −1 after 50 cycles at 100 mA g −1 close to the theoretical capacity of copper oxide (674 mA h g −1 ).

  • Ultrafine nickel oxide quantum dots enbedded with few-layer exfoliative graphene for an asymmetric supercapacitor: Enhanced capacitances by Alternating Voltage
    Journal of Power Sources, 2015
    Co-Authors: Mingjun Jing, Yingchang Yang, Yirong Zhu, Hongshuai Hou, Chiwei Wang, Xinnan Jia, Yan Zhang

    Abstract:

    Abstract A green and one-step method of electrochemical Alternating Voltage has been utilized to form NiO quantum dots/graphene flakes (NiO-dots/Gh) for supercapacitor applications. NiO quantum dots (∼3 nm) are uniformly deposited on few-layer graphene surfaces by oxygen functional groups on graphene surface that is naturally utilized to bridge NiO and graphene through Ni–O–C bands, which exhibits outstanding specific capacitance 1181.1 F g −1 at a current density of 2.1 A g −1 and rate behavior 66.2% at 42 A g −1 as NiO dots can be fleetly wired up to current collector through the underlying graphene two-dimensional layers. The NiO-dots/Gh composite is further undertaken in asymmetric supercapacitors with high energy density (27.3 Wh kg −1 at 1562.6 W kg −1 ).

Hongshuai Hou – One of the best experts on this subject based on the ideXlab platform.

  • Alternating Voltage Introduced [001]-Oriented α-MoO3 Microrods for High-Performance Sodium-ion Batteries
    Electrochimica Acta, 2017
    Co-Authors: Hongshuai Hou, Hanxiao Liao, Zhaodong Huang, Xiaoqing Qiu

    Abstract:

    Abstract Rod-like α-MoO 3 is successfully designed by Alternating Voltage induced electrochemical synthesis (AVIES) approach. The morphology and texture of MoO 3 is effectively controlled by applying various calcination temperature of 300–600 °C. Notably, the α-MoO 3 microrods growing along [001] direction have the high aspect ratio, and the randomly stacked structure can facilitate the charge transfer and offer more active sites for sodium storage. When utilized for sodium-ion batteries, it presents the high charge capacities of 305 mAh g −1 at 1C and 143 mAh g −1 at 10C. Even after 3000 cycles at 10C, a significant capacity of 108 mAh g −1 is still delivered, highlighting its marvelous electrochemical properties. This work may be a compelling exploration for developing metal/metal oxides materials for sodium storages by AVIES.

  • Alternating Voltage induced ordered anatase TiO2 nanopores: An electrochemical investigation of sodium storage
    Journal of Power Sources, 2016
    Co-Authors: Lingling Xie, Hongshuai Hou, Hanxiao Liao, Zhaodong Huang, Xiaoqing Qiu

    Abstract:

    Abstract Anatase TiO 2 nanopores are successfully prepared through Alternating Voltage induced electrochemical synthesis (AVIES) approach at room temperature. When utilizing TiO 2 nanoporous materials as an anode for Na-ion battery, it delivers a reversible charge-discharge capacity of around 180 mA h g −1 at 0.2 C (67 mA g −1 ) after 200 cycles. Meanwhile, it also shows a good cycling performance and a high rate capability due to unique nanoporous structures, which promote electrolyte wetting and facilitate diffusion of Na + . Additionally, cyclic voltammetry demonstrate that the sodium-ion storage of as-prepared TiO 2 is a cooperative control behavior of diffusion and capacitance, but mainly controlled by capacitive behavior, which further facilitates a rapid (de-)intercalation of Na + .

  • Alternating Voltage induced electrochemical synthesis of three-dimensionalization copper oxide for lithium-ion battery application
    Chemical Physics Letters, 2016
    Co-Authors: Mingjun Jing, Hongshuai Hou, Yan Zhang, Zhiying Ding, Guoqiang Zou

    Abstract:

    Abstract Three-dimensional copper oxide structures composed of single crystal nanosheets have been successfully prepared by a green electrochemical Alternating Voltage approach. This special structure of copper oxide grown along the [0 1 0] direction can be effective to accommodate the volume expansion during charge–discharge cycles. The obtained product as anode materials in lithium-ion batteries displays outstanding electrochemical performances with a high reversible capacity of 635.2 mA h g −1 after 50 cycles at 100 mA g −1 close to the theoretical capacity of copper oxide (674 mA h g −1 ).

Yingchang Yang – One of the best experts on this subject based on the ideXlab platform.

  • Black defect-engineered TiO2 nanocrystals fabricated through square-wave Alternating Voltage as high-performance anode materials for lithium-ion batteries
    Journal of Alloys and Compounds, 2018
    Co-Authors: Yingchang Yang, Wei Shi, Liao Shijia, Renhui Zhang, Senlin Leng

    Abstract:

    Abstract Black defect-engineered TiO2 nanocrystals have been successfully fabricated via electrochemical square-wave Alternating Voltage method. Repeated redox of Ti foil surface accompanying vigorous hydrogen evolution plays a key role on the formation of the black TiO2 nanocrystals. Transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller specific surface area are utilized to characterize the structure and properties of the products. When utilized as anode materials for lithium-ion batteries, the black TiO2 nanocrystals electrode exhibits a high reversible capacity of 271 and 266 mAh g−1 after 200 cycles at 0.5 C (1 C = 168 mA g−1), as well as a good rate capability, which are likely to be associated with small particle size (ca. 6 nm), surface/interfacial pseudocapacitive lithium storage and increased electronic conductivity contributed from Ti3+ defects.

  • Ultrafine nickel oxide quantum dots enbedded with few-layer exfoliative graphene for an asymmetric supercapacitor: Enhanced capacitances by Alternating Voltage
    Journal of Power Sources, 2015
    Co-Authors: Mingjun Jing, Yingchang Yang, Yirong Zhu, Hongshuai Hou, Chiwei Wang, Xinnan Jia, Yan Zhang

    Abstract:

    Abstract A green and one-step method of electrochemical Alternating Voltage has been utilized to form NiO quantum dots/graphene flakes (NiO-dots/Gh) for supercapacitor applications. NiO quantum dots (∼3 nm) are uniformly deposited on few-layer graphene surfaces by oxygen functional groups on graphene surface that is naturally utilized to bridge NiO and graphene through Ni–O–C bands, which exhibits outstanding specific capacitance 1181.1 F g −1 at a current density of 2.1 A g −1 and rate behavior 66.2% at 42 A g −1 as NiO dots can be fleetly wired up to current collector through the underlying graphene two-dimensional layers. The NiO-dots/Gh composite is further undertaken in asymmetric supercapacitors with high energy density (27.3 Wh kg −1 at 1562.6 W kg −1 ).

  • Alternating Voltage Introduced NiCo Double Hydroxide Layered Nanoflakes for an Asymmetric Supercapacitor.
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Mingjun Jing, Yingchang Yang, Hongshuai Hou, Craig E. Banks, Yan Zhang

    Abstract:

    An electrochemical Alternating Voltage approach of producing NiCo double hydroxide (NiCoDH) layered ultrathin nanoflakes with large specific surface area (355.8 m2 g–1), remarkable specific capacitance and rate capability is presented. The obtained NiCoDH as anode for asymmetric supercapacitors shows excellent energy density of 17.5 Wh kg–1 at high power density of 10.5 kW kg–1 and cycling stability (91.2% after 10 000 cycles).