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

机译：石墨烯气体载体和石墨烯量子点改性γ-Mnooh纳米管作为高效的氧还原反应电催化剂

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In this work, we demonstrate a facile strategy to synthesize a novel three-dimensional (3D) graphene aerogel-supported and graphene quantum dots-modified γ-MnOOH nanotubes as a highly efficient electrocatalyst. The structure, morphology, and chemical composition of γ-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 γ-MnOOH@GA/GQDs hybrid exhibits more positive onset potential and half-wave potential, faster charge transfer, lower Tafel slope than that of γ-MnOOH@GA, GA and γ-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 γ-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 γ-MnOOH surfaces to further boost the electrocatalytic property.
机译：在这项工作中，我们证明了一种容易策略，用于合成一种新型三维（3D）石墨烯气体负载的和石墨烯量子点改性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射线光电子来研究γ-Mnooh @ Ga / GQDS的结构，形貌和化学组成光谱学（XPS）。催化剂的电催化活性由循环伏安图（CV），电化学阻抗谱（EIS）和旋转盘电极（RDE）测量讨论 - 在O _（2） - 饱和0.1M KOH电解质中进行旋转盘电极（RDE）测量。 γ-mnooh @ ga / gqds杂交机表现出更积极的发病潜力和半波电位，更快的电荷转移，比γ-mnooh @ ga，ga和γ-mnooh更低的塔拉布斜率，并且主要经历直接4e〜（ ？）反应途径。此外，其电催化性能与商业20wt％pt / c相当，其归因于具有大特异性区域和快速电子传输的Ga的独特的3D皱巴覆多孔纳米结构，以及γ-mnooh纳米管和γ-mnooh纳米管之间的协同共价偶联乔。更重要的是，GQDS结构缺陷可以促进氧气和电荷转移的吸附。作为高效表面“敏化剂”，GQD在γ-Mnooh表面上改性，以进一步提高电催化性。

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