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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Graphene hydrogels non-covalently functionalized with alizarin: an ideal electrode material for symmetric supercapacitors
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Graphene hydrogels non-covalently functionalized with alizarin: an ideal electrode material for symmetric supercapacitors

机译：茜素非共价功能化的石墨烯水凝胶：对称超级电容器的理想电极材料

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摘要

In the present work, the anthraquinone derivative alizarin (AZ) with a multi-electron redox center as the functionalizing molecule has been immobilized onto three-dimensional (3D) self-assembled graphene hydrogels (SGHs) through a non-covalent functionalization strategy. The excellent electrical conductivity and interconnected macroporous framework of SGHs facilitate unconstrained electrolyte ion diffusion and electron transportation. Moreover, the surface confined redox reactions and fast kinetic feature of AZ molecules result in an outstanding electrochemical capacitive performance. In the three-electrode system, the AZ-functionalized SGHs (AZ-SGHs) electrodes exhibit a larger specific capacitance (as high as 350 F g(-1) at 1 A g(-1), two times higher than that of bare SGHs) and ultrahigh rate capability (61% capacitance retention at 200 A g(-1)) in aqueous electrolyte solutions. More importantly, when the resultant AZ-SGHs electrodes are integrated into a symmetric supercapacitor (SSC), the electrode material shows a good self-synergy and potential self-matching behavior due to two pairs of redox peaks with mirror symmetry. As a result, the AZ-SGHs SSC exhibits an excellent energy storage performance. In a voltage range from 0 to 1.4 V. a maximum energy density of 18.2 W h kg(-1) is achieved at a power density of 700 W kg(-1).
机译：在目前的工作中，通过非共价官能化策略将具有多电子氧化还原中心作为官能化分子的蒽醌衍生物茜素（AZ）固定在三维（3D）自组装石墨烯水凝胶（SGH）上。 SGH的出色电导率和相互连接的大孔骨架有助于无限制的电解质离子扩散和电子传输。此外，AZ分子的表面受限氧化还原反应和快速动力学特征导致出色的电化学电容性能。在三电极系统中，AZ功能化的SGH（AZ-SGH）电极表现出更大的比电容（在1 A g（-1）时高达350 F g（-1），比裸电极高出两倍） SGHs）和超高倍率能力（在200 A g（-1）时在电解质水溶液中具有61％的电容保持率）。更重要的是，当将所得的AZ-SGHs电极集成到对称超级电容器（SSC）中时，由于两对镜像对称的氧化还原峰，电极材料显示出良好的自协同作用和潜在的自匹配行为。结果，AZ-SGHs SSC表现出出色的储能性能。在0到1.4 V的电压范围内，在700 W kg（-1）的功率密度下可达到18.2 W h kg（-1）的最大能量密度。

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