Koventhan Chelliah, Pandiyarajan Sabarison, Chen Shen Ming, Selvan Chelliah Senthamil
Department of Chemical Engineering and Biotechnology, College of Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, Taiwan 10608, Republic of China.
Department of Mechanical Engineering, College of Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, Taiwan 10608, Republic of China.
ACS Appl Mater Interfaces. 2023 Sep 27;15(38):44876-44886. doi: 10.1021/acsami.3c07836. Epub 2023 Sep 15.
In recent years, electrochemical supercapacitors are expected to represent the future of energy storage device technology. Specifically, the excellent electrochemical performance with long cycle life, high energy, and power density is considered an essential criterion for commercial applications. Herein, we constructed a novel composite of neodymium cobalt oxide-encapsulated graphene oxide nanocomposite (NCO/GO) via a simple and robust method for a symmetric supercapacitor (SSC) device. The prepared samples were securitized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and Brunauer-Emmett-Teller analysis. The as-synthesized NCO/GO is deposited on nickel foam (NF) and used as a supercapacitor electrode (NCO/GO/NF), which exhibits superior specific capacitance () of 1080.92 F g at 1 A g and fantastic cycling life with ∼89.42% retention after 10,000 cycles at 10 A g in 1.0 M KOH aqueous electrolyte. A tremendous electrochemical performance of the hybrid nanocomposite electrode is obtained from the good redox activity and synergistic effects of the NCO spherical-like nanoparticles combined with the GO nanosheets. Furthermore, the assembled SSC device delivers significantly enhanced power density (932.93 Wh kg) and energy density (210.42 mWh kg). Moreover, the SSCs exhibit excellent cycling stability with ∼82.19% capacity retaining over 10,000 charge/discharge cycles. Remarkably, a 1.8 V red light-emitting diode (LED) can be lit up for more than 10 min by series connection SSCs. Thus, the obtained results indicated that the NCO/GO/NF//NCO/GO/NF symmetric device has a robust and cost-effective electrode material for high-performance supercapacitor systems.
近年来，电化学超级电容器有望代表储能设备技术的未来。具体而言，具有长循环寿命、高能量和功率密度的优异电化学性能被认为是商业应用的重要标准。在此，我们通过一种简单且可靠的方法构建了一种新型的氧化钕钴包覆氧化石墨烯纳米复合材料（NCO/GO），用于对称超级电容器（SSC）器件。通过X射线衍射、傅里叶变换红外光谱、拉曼光谱、X射线光电子能谱、场发射扫描电子显微镜、高分辨率透射电子显微镜和布鲁诺尔-埃米特-泰勒分析对制备的样品进行了表征。合成的NCO/GO沉积在泡沫镍（NF）上，并用作超级电容器电极（NCO/GO/NF），在1 A g时表现出1080.92 F g的优异比电容（），在1.0 M KOH水溶液电解质中以10 A g循环10000次后具有约89.42%的出色循环寿命保持率。混合纳米复合电极的优异电化学性能源于NCO类球形纳米颗粒与GO纳米片的良好氧化还原活性和协同效应。此外，组装的SSC器件具有显著提高的功率密度（932.93 Wh kg）和能量密度（210.42 mWh kg）。而且，SSC在10000次充放电循环中表现出优异的循环稳定性，容量保持率约为82.19%。值得注意的是，可以通过串联SSC点亮一个1.8 V的红色发光二极管（LED）超过10分钟。因此，所获得的结果表明，NCO/GO/NF//NCO/GO/NF对称器件对于高性能超级电容器系统具有一种坚固且经济高效的电极材料。
