Sol-gel synthesis of nanoporous NiCo₂O₄ thin films on ITO glass as high-performance supercapacitor electrodes

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• 作者：Yang Liu ; Ni Wang ; Chengtao Yang ; Wencheng Hu ; ^{huwc@uestc.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanoporous ; NiCo2O4 thin film ; Supercapacitor ; High specific capacitance
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：11411-11416
• 全文大小：1971 K

文摘

Nanoporous NiCo₂O₄ thin films have been deposited on ITO glass by a sol–gel approach and X-ray diffraction spectroscopy has been employed to characterize their crystalline structure showing the successful synthesis of spinel phase. Scanning electron microscopy and atomic force microscope demonstrate the nanoporous surface morphologies. The electrochemical properties of nanoporous NiCo₂O₄ thin films investigated as supercapacitor electrodes by cyclic voltammetry and galvanostatic charge/discharge in 2 M KOH aqueous solution, show the nanoporous NiCo₂O₄ thin films to exhibit a high areal specific capacitance of 40.6 mF cm⁻² (corresponding to mass specific capacitance of 2157 F g⁻¹) at a current density of 0.133 mA cm⁻² and a long-term cyclic stability (96.5% retention of initial specific capacitance after 10,000 cycles). Both the nanoporous morphology and binder-free frame have been experienced to play an important role for the enhancement of electrochemical performance.