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首页> 外文期刊>RSC Advances >Graphene aerogel-supported and graphene quantum dots-modified gamma-MnOOH nanotubes as a highly efficient electrocatalyst for oxygen reduction reaction
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Graphene aerogel-supported and graphene quantum dots-modified gamma-MnOOH nanotubes as a highly efficient electrocatalyst for oxygen reduction reaction

机译：石墨烯气凝胶支撑和石墨烯量子点修饰的γ-MnOOH纳米管作为氧还原反应的高效电催化剂

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摘要

In this work, we demonstrate a facile strategy to synthesize a novel three-dimensional (3D) graphene aerogel-supported and graphene quantum dots-modified gamma-MnOOH nanotubes as a highly efficient electrocatalyst. The structure, morphology, and chemical composition of gamma-MnOOH@GA/GQDs are investigated by X-ray diffraction (XRD) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The electrocatalytic activity of catalysts is discussed by cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS), and rotating disk electrode (RDE) measurements in O-2-saturated 0.1 M KOH electrolyte. The gamma-MnOOH@GA/GQDs hybrid exhibits more positive onset potential and half-wave potential, faster charge transfer, lower Tafelslope than that of gamma-MnOOH@GA, GA and gamma-MnOOH, and mainly undergoes a direct 4e(-) reaction pathway. Furthermore, its electrocatalytic performance is comparable with the commercial 20 wt% Pt/C, which is attributed to the unique 3D crumpled porous nanostructure of GA with large specific area and fast electron transport, and the synergic covalent coupling between the gamma-MnOOH nanotubes and GA. More importantly, the GQDs structural defects can facilitate the adsorption of oxygen and charge transfer. As a highly efficient surface "sensitizer", GQDs are modified on the gamma-MnOOH surfaces to further boost the electrocatalytic property.
机译：在这项工作中，我们展示了一种简便的策略来合成新型的三维（3D）石墨烯气凝胶支撑和石墨烯量子点修饰的γ-MnOOH纳米管，作为高效的电催化剂。通过X射线衍射（XRD）光谱，扫描电子显微镜（SEM），透射电子显微镜（TEM），拉曼光谱和X射线光电子学研究了γ-MnOOH@ GA / GQDs的结构，形态和化学成分光谱（XPS）。通过循环伏安图（CV），电化学阻抗谱（EIS）和O-2-饱和0.1 M KOH电解质中的旋转盘电极（RDE）测量，讨论了催化剂的电催化活性。与γ-MnOOH@ GA，GA和γ-MnOOH相比，γ-MnOOH@ GA / GQDs杂合体显示出更高的正起始电势和半波电势，更快的电荷转移，更低的Tafelslope，并且主要经历直接4e（-）反应途径。此外，其电催化性能可与市售的20 wt％Pt / C相媲美，这归因于GA具有独特的3D皱褶多孔纳米结构，具有大的比表面积和快速的电子传输能力，以及γ-MnOOH纳米管与碳纳米管之间的协同共价偶联。 GA。更重要的是，GQD的结构缺陷可以促进氧气的吸附和电荷转移。作为高效的表面“敏化剂”，GQD在γ-MnOOH表面进行了修饰，以进一步提高电催化性能。

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