Facile interfacial synthesis of flower-like hierarchical a-MnO2 sub-microspherical superstructures constructed by two-dimension mesoporous nanosheets and their application in electrochemical capacitors
Facile interfacial synthesis of flower-like hierarchical a-MnO2 sub-microspherical superstructures constructed by two-dimension mesoporous nanosheets and their application in electrochemical capacitors
复制标题
二维介孔纳米片构建的花状分级α-MnO2亚微球超结构的简便界面合成及其在电化学电容器中的应用
DOI：
10.1039/c1jm11886b
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发表时间：
2011-10
影响因子：
--
通讯作者：
张校刚
中科院分区：
文献类型：
--
作者：
张校刚
本工作采用一种新颖的界面策略，以两亲性三嵌段聚氧乙烷-b-聚氧丙烷-b-聚氧乙烷为反应原料和模板，在酸性介质中合成了花状的层次型a-MnO2亚微球超结构。进一步的物理表征表明，由二维介孔纳米片组装而成的比表面积为216m2g−1的花状MnO2层状超结构与合成条件密切相关。电化学结果表明，这种独特的二氧化锰超结构材料在0.117 A g−1电流密度下的比电容为298F g−1，在2.353 A g−1电流密度下的比电容为236F g−1，表现出很强的高倍率高能量密度传输能力。良好的电化学容量主要源于其独特的层次化多孔结构和丰富的MnO2-电解液界面。独特的层次化多孔结构为K+离子与其丰富的电活性中心的接触提供了方便的离子传输途径，从而实现了快速高效的能量存储。
In this work, flower-like hierarchical a-MnO2 sub-microspherical superstructures were synthesized by means of a novel interfacial strategy, where the amphiphilic tri-block poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) was used both as a reaction material and a template in an acidic media. Further physical characterizations revealed that the flower-like MnO2 hierarchical superstructures with a specific surface area of 216 m2 g−1 were assembled by two-dimension mesoporous nanosheet building blocks and greatly depended upon the synthesis condition. Electrochemical results demonstrated that the unique MnO2 superstructures delivered a specific capacitance of 298 F g−1 at a current density of 0.117 A g−1, and even 236 F g−1 at 2.353 A g−1, demonstrating their great ability of delivering large energy density at high rates. The good electrochemical capacitance mainly resulted from their unique hierarchical porous structure and rich MnO2-electrolyte interfaces. The unique hierarchical porous structure provided convenient ion transport paths for K+ ions to contact their rich electroactive sites for fast and efficient energy storage.
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