Journal
NANO ENERGY
Volume 70, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104482
Keywords
Vertically-structured electrode; Energy storage; Interlayer-confined reaction; Ion-transport; Chemically-expanded graphite
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Funding
- National Science Foundation of China [51173027]
- Shanghai International Collaboration research project [19520713900]
- State Key Laboratory of Molecular Engineering of Polymers for the Senior Visiting Scholar Project of Fudan University
- National Research Foundation, Singapore [NRF-NRF12015-01]
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Graphene has attracted major interests as electrode materials for energy storage applications. However, the major limitation of using blade- or spin-coated graphene films for fabricating electrode is that the basal plane of the flat-lying graphene is orthogonal to the direction of charge transport, causing sluggish charge transfer kinetics for the coated graphene film. Here we propose a general, scalable strategy to prepare vertically-structured hybrid electrodes using accordion-like, chemically expanded graphite (CEG). The coated CEG rods possess two-dimensional (2D) interlayer galleries that are vertically aligned with respect to the substrate because of their large length-diameter ratio, which facilitates high-efficiency ion transport. Due to its excellent wettability and high electrochemical surface areas, these interlayer galleries allow a high loading of redox-active (RA) materials, including metal (Pt), metal hydroxide (Ni(OH)(2), Fe2O3 and MnO2) or metal dichalcogenide (MoS2). As an example, Ni(OH)(2)-infiltrated CEG shows excellent rate-performance and long-term cycling stability when used as electrochemical electrodes in lithium-ion batteries and supercapacitors.
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