Nanoflake NiMoO4 based smart supercapacitor for intelligent power balance monitoring
Nanoflake NiMoO4 based smart supercapacitor for intelligent power balance monitoring
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DOI：
10.1016/j.solmat.2018.05.030
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发表时间：
2018-10-01
影响因子：
6.9
通讯作者：
Kim, Hyungsang
中科院分区：
文献类型：
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作者：
Chavan, Harish S.;Hou, Bo;Kim, Hyungsang
超级电容器被公认为是为我们日常生活中的电子设备供电的新兴能源之一。尽管已经设计和演示了各种类型的超级电容器，但如果将其他物理化学特性（例如光学）的利用纳入电极中，它们的市场前景可能会变得更加先进。在此，我们提出了一种基于纳米片 NiMoO4 薄膜的电致变色超级电容器（智能超级电容器），该薄膜是使用简便且控制良好的连续离子层吸附和反应（SILAR）技术制造的。多晶纳米片 NiMoO4 电极表现出 96.3 cm(2) 的大电化学活性表面积。其纳米多孔结构为离子的嵌入和脱嵌提供了简单的途径。纳米片 NiMoO4 电极在充电状态下呈深棕色，在放电状态下变得透明，具有 57% 的高光学调制。该电极在1 Ag-1电流倍率下表现出1853 Fg(-1)的高比容量和3L44 cm(2)/C的良好着色效率。当电极在不同电位下充电时获得动态视觉信息，反映设备中能量存储的水平。与初始容量相比，该器件在 2500 次充放电循环后仍保留 65% 的容量。纳米片NiMoO4基智能超级电容器的优异性能与纳米多孔形态、大电化学活性表面积和氧化还原反应所需化学成分的协同效应有关。
A supercapacitor is well recognized as one of emerging energy sources for powering electronic devices in our daily life. Although various kind of supercapacitors have been designed and demonstrated, their market aspect could become advanced if the utilisation of other physicochemical properties (e.g. optical) is incorporated in the electrode. Herein, we present an electrochromic supercapacitor (smart supercapacitor) based on a nanoflake NiMoO4 thin film which is fabricated using a facile and well-controlled successive ionic layer adsorption and reaction (SILAR) technique. The polycrystalline nanoflake NiMoO4 electrode exhibits a large electrochemically active surface area of 96.3 cm(2). Its nanoporous architecture provides an easy pathway for the intercalation and de-intercalation of ions. The nanoflake NiMoO4 electrode is dark-brown in the charged state and becomes transparent in the discharged state with a high optical modulation of 57%. The electrode shows a high specific capacity of 1853 Fg(-1) at a current rate of 1 Ag-1 with a good coloration efficiency of 3L44 cm(2)/C. Dynamic visual information is obtained when the electrode is charged at different potentials, reflecting the level of energy storage in the device. The device retains 65% capacity after 2500 charge-discharge cycles compared with its initial capacity. The excellent performance of the nanoflake NiMoO4 based smart supercapacitor is associated with the synergetic effect of nanoporous morphology with a large electrochemically active surface area and desired chemical composition for redox reaction.