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首页> 外文期刊>Advanced energy materials >Exploration of the Effective Location of Surface Oxygen Defects in Graphene-Based Electrocatalysts for All-Vanadium Redox-Flow Batteries
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Exploration of the Effective Location of Surface Oxygen Defects in Graphene-Based Electrocatalysts for All-Vanadium Redox-Flow Batteries

机译：全钒氧化还原液流电池石墨烯基电催化剂中表面氧缺陷有效位置的探索

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摘要

Oxygen functional groups play a key role in vanadium redox reactions. To identify the effective location of oxygen functionalities in graphene-based nanomaterials, a selectively edge-functionalized graphene nanoplatelet (E-GnP) with a crystalline basal plane is produced by a ball-milling process in the presence of dry ice. For comparison, the reduced graphene oxide (rGO) that contains defects at both edges and in the basal plane is produced by a modified Hummers' method. The location of defects in the graphene-based nanomaterials significantly affects the electrocatalytic activity towards vanadium redox couples (V2+/V3+ and VO2+/VO2 +). The improved activity of these nanoplatelets lies in the presence of oxygen defects at the edge sites and higher crystallinity of basal planes than in rGO. This effective location of oxygen defects facilitates fast electron-transfer and mass-transport processes.
机译：氧官能团在钒氧化还原反应中起关键作用。为了确定氧功能在石墨烯基纳米材料中的有效位置，在干冰的存在下，通过球磨工艺生产了具有结晶基面的选择性边缘官能化石墨烯纳米片（E-GnP）。为了进行比较，通过改进的悍马方法产生了在两个边缘和基面上都包含缺陷的还原氧化石墨烯（rGO）。石墨烯基纳米材料中缺陷的位置会显着影响对钒氧化还原对（V2 + / V3 +和VO2 + / VO2 +）的电催化活性。与rGO相比，这些纳米片的活性提高在于边缘部位存在氧缺陷，且基底平面的结晶度更高。氧缺陷的这种有效位置促进了快速的电子转移和质量转移过程。

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  • 来源
    《Advanced energy materials》 |2015年第5期|1-7|共7页
  • 作者

    Minjoon Park; In-Yup Jeon; Jaechan Ryu; Jong-Beom Baek; Jaephil Cho;

  • 作者单位

    Department of Energy Engineering and School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea;

    Department of Energy Engineering and School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea;

    Department of Energy Engineering and School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea;

    Department of Energy Engineering and School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea;

    Department of Energy Engineering and School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea;

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  • 正文语种 eng
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  • 关键词

    edge-functionality; electrocatalysts; energy storage; graphene; vanadium redox reactions;

    机译：边缘功能;电催化剂;储能;石墨烯;钒氧化还原反应;

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