Thiagarajan Kannadasan, Balaji Dhandapani, Madhavan Jagannathan, Theerthagiri Jayaraman, Lee Seung Jun, Kwon Ki-Young, Choi Myong Yong
Solar Energy Lab, Department of Chemistry, Thiruvalluvar University, Vellore 632 115, India.
Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, Korea.
Nanomaterials (Basel). 2020 Nov 4;10(11):2195. doi: 10.3390/nano10112195.
In the present study, the synthesis of CoWO (CWO)-Ni nanocomposites was conducted using a wet chemical method. The crystalline phases and morphologies of the Ni nanoparticles, CWO, and CWO-Ni composites were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDAX). The electrochemical properties of CWO and CWO-Ni composite electrode materials were assessed by cyclic voltammetry (CV), and galvanostatic charge-discharge (GCD) tests using KOH as a supporting electrolyte. Among the CWO-Ni composites containing different amounts of Ni1, Ni2, and Ni3, CWO-Ni3 exhibited the highest specific capacitance of 271 F g at 1 A g, which was greater than that of bare CWO (128 F g). Moreover, the CWO-Ni3 composite electrode material displayed excellent reversible cyclic stability and maintained 86.4% of its initial capacitance after 1500 discharge cycles. The results obtained herein demonstrate that the prepared CWO-Ni3 nanocomposite is a promising electrode candidate for supercapacitor applications.
在本研究中，采用湿化学法合成了CoWO（CWO）-Ni纳米复合材料。利用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和能量色散X射线光谱（EDAX）分析了Ni纳米颗粒、CWO以及CWO-Ni复合材料的晶相和形貌。以KOH作为支持电解质，通过循环伏安法（CV）和恒电流充放电（GCD）测试评估了CWO和CWO-Ni复合电极材料的电化学性能。在含有不同量Ni1、Ni2和Ni3的CWO-Ni复合材料中，CWO-Ni3在1 A g时表现出最高的比电容271 F g，高于裸CWO（128 F g）。此外，CWO-Ni3复合电极材料表现出优异的可逆循环稳定性，在1500次放电循环后仍保持其初始电容的86.4%。本文获得的结果表明，制备的CWO-Ni3纳米复合材料是超级电容器应用中一种有前景的电极候选材料。
