Journal
CHEMICAL ENGINEERING JOURNAL
Volume 455, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.140789
Keywords
Vanadium redox flow batteries; Ionic liquid; Microwave; MXene; Electrocatalysts
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In this study, a novel IL-MW-MXene with unique 2D structure and abundant active functional groups was prepared easily and effectively by ionic liquid etching and microwave-assisted stripping. It was proposed as a promising electrocatalyst for the V3+/V2+ redox reactions in VRFBs. The IL-MW-MXene showed improved hydrophilicity and electrocatalytic activity, resulting in a higher energy efficiency of 83.56% in a single VRFB compared to pristine CF as the negative electrode.
The reaction kinetics of V3+/V2+ redox couple in VRFBs are relatively lagging behind, thus developing excellent electrocatalyst to enhance the negative reaction kinetics is more efficient to improve the battery performance. In this work, a novel IL-MW-MXene with unique 2D structure and abundant active functional groups is prepared easily and effectively by ionic liquid etching and microwave-assisted stripping, which is proposed as a promising electrocatalyst for the V3+/V2+ redox reactions. The morphology, structure and surface element composition are systematically investigated. Carbon fibers felt covered with this novel 2D-MXene flake exhibits improved hy-drophilicity and electrocatalytic activity towards the V3+/V2+ redox reactions. And the single VRFB with IL-MW-MXene/CF composites as the negative electrode exhibits the higher energy efficiency of 83.56 % at 200 mA cm-2, which are 7.53 % higher than that with pristine CF as the negative electrode. More importantly, the energy efficiency shows no obvious attenuation over 200 continuous charge-discharge cycles, and the discharging ca-pacity decay rate is only 0.12 % per cycle. The IL-MW-MXene exhibits good application potential in VRFBs and other electrochemical devices due to the green and highly effective preparation process and excellent electro-catalytic property.
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