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Electrochromic and Electrochemical Energy Storage Properties of Micro-nano Hierarchical NiO film

机译:微纳分层NiO薄膜的电致变色和电化学储能特性

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Micro-nano hierarchical metal oxides offer unique advantages over traditional compact ones whenserving as electrode materials, mainly because their good electrolyte wettability and high specific surfacearea can facilitate fast ion and electron transfer. Herein, we develop a facile route to fabricate micro-nano hierarchical NiO films for achieving enhanced bifunction of electrochromism and energy storage.The introducing of hierarchical structure effectively reduced the ion diffusion resistance and electrontransfer resistance. As a result, hierarchical NiO films demonstrate superior electrochromic opticalmodulation and electrochemical energy storage compared with the compact ones. The transmittancechange between the coloration and bleached states reaches 64.5% at 550 nm. Furthermore, thecapacitance of hierarchical NiO is 14.85 F g -1 at 0.2 mA cm -2 , which is approximately 20% higher thanthat of the compact NiO (12.36 F g -1 ). This work provides an efficient way to prepare high-performancehierarchical NiO films, which can be extended to the fabrication of other metal oxides for wideapplications in the highly efficient electrochemical utilization.
机译:当用作电极材料时,微纳米级金属氧化物具有优于传统紧凑型金属氧化物的独特优势,主要是因为它们良好的电解质润湿性和高比表面积可以促进离子和电子的快速转移。本文中,我们开发了一种制备微纳米分层NiO膜的简便方法,以实现增强的电致变色和能量存储双功能。引入分层结构有效降低了离子扩散阻力和电子转移阻力。结果,与紧凑型NiO薄膜相比,分层NiO薄膜具有出色的电致变色光学调制和电化学能量存储能力。在550nm处,着色状态和漂白状态之间的透射率变化达到64.5%。此外,分层NiO在0.2mA cm -2处的电容为14.85 F g -1,比紧凑型NiO(12.36 F g -1)高约20%。这项工作提供了一种制备高性能分层NiO膜的有效方法,该方法可以扩展到其他金属氧化物的制备中,从而在高效电化学利用中得到广泛应用。

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