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  • Wiley  (3)
  • Xu, Lin  (3)
  • English  (3)
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  • Wiley  (3)
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  • English  (3)
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  • 1
    In: Small, Wiley, Vol. 15, No. 30 ( 2019-07)
    Abstract: In situ monitoring the evolution of electrode materials in micro/nano scale is crucial to understand the intrinsic mechanism of rechargeable batteries. Here a novel on‐chip Langmuir–Blodgett nanowire (LBNW) microdevice is designed based on aligned and assembled MnO 2 nanowire quasimonolayer films for directly probing Zn‐ion batteries (ZIBs) in real‐time. With an interdigital device configuration, a splendid Ohmic contact between MnO 2 LBNWs and pyrolytic carbon current collector is demonstrated here, enabling a small polarization voltage. In addition, this work reveals, for the first time, that the conductance of MnO 2 LBNWs monotonically increases/decreases when the ZIBs are charged/discharged. Multistep phase transition is mainly responsible for the mechanism of the ZIBs, as evidenced by combined high‐resolution transmission electron microscopy and in situ Raman spectroscopy. This work provides a new and adaptable platform for microchip‐based in situ simultaneous electrochemical and physical detection of batteries, which would promote the fundamental and practical research of nanowire electrode materials in energy storage applications.
    Type of Medium: Online Resource
    ISSN: 1613-6810 , 1613-6829
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2168761-4
    detail.hit.zdb_id: 2168935-0
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  • 2
    In: Small, Wiley, Vol. 15, No. 31 ( 2019-08)
    Abstract: In the hydrogen evolution reaction (HER), energy‐level matching is a prerequisite for excellent electrocatalytic activity. Conventional strategies such as chemical doping and the incorporation of defects underscore the complicated process of controlling the doping species and the defect concentration, which obstructs the understanding of the function of band structure in HER catalysis. Accordingly, 2H‐MoS 2 and 1T‐MoS 2 are used to create electrocatalytic nanodevices to address the function of band structure in HER catalysis. Interestingly, it is found that the 2H‐MoS 2 with modulated Fermi level under the application of a vertical electric field exhibits excellent electrocatalytic activity (as evidenced by an overpotential of 74 mV at 10 mA cm −2 and a Tafel slope of 99 mV per decade), which is superior to 1T‐MoS 2 . This unexpected excellent HER performance is ascribed to the fact that electrons are injected into the conduction band under the condition of back‐gate voltage, which leads to the increased Fermi level of 2H‐MoS 2 and a shorter Debye screen length. Hence, the required energy to drive electrons from the electrocatalyst surface to reactant will decrease, which activates the 2H‐MoS 2 thermodynamically.
    Type of Medium: Online Resource
    ISSN: 1613-6810 , 1613-6829
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2168761-4
    detail.hit.zdb_id: 2168935-0
    Location Call Number Limitation Availability
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  • 3
    In: Advanced Energy Materials, Wiley, Vol. 8, No. 32 ( 2018-11)
    Abstract: Accompanied by the development and utilization of renewable energy sources, efficient energy storage has become a key topic. Electrochemical energy storage devices are considered to be one of the most practical energy storage devices capable of converting and storing electrical energy generated by renewable resources, which are also used as the power source of electric vehicles and portable electronic devices. The ultimate goals of electrochemical energy storage devices are long lifespan, high safety, high power, and high energy density. To achieve the above goals, researchers have attempted to use various nanomaterials to improve electrochemical performance. Among these, 1D materials play a critical role. This review classifies nanowires according to morphologies (simple nanowires, core–shell/coated nanowires, hierarchical/heterostructured nanowires, porous/mesoporous nanowires, hollow structures) and combined forms (nanowire arrays, nanowire networks, nanowire bundles) and introduces their characteristics and corresponding synthetic methods. The characteristics and advantages of nanowires in lithium‐ion, sodium‐ion and zinc‐ion batteries, and supercapacitors, along with in situ characterization of nanowire electrode are reflected in the application examples. In the summary and outlook section, some comments are presented to provide directions for further exploring nanowire based electrochemical energy storage in the future.
    Type of Medium: Online Resource
    ISSN: 1614-6832 , 1614-6840
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2555492-X
    detail.hit.zdb_id: 2594556-7
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