一种高性能的电极材料,持久耐用,和低成本的超级电容器长期以来一直是学术界和工业界的期望。在所有影响电极材料电化学性能和循环稳定性的因素中,形貌和内在结构特征是最重要的。在这项研究中,利用Ce3+和-COOH基团设计了一种新型的3D花状Ce(COOH)3电极材料,并通过一锅微波辅助方法制备。通过SEM对样品的形貌和结构特征进行了分析,EDS,TEM,XRD,FT-IR,XPS,N2吸附/解吸技术,并在三电极结构中研究了电化学行为。Ce(COOH)3电极在1Ag-1时具有140Fg-1的出色比电容,高于许多其他先前报道的Ce基电极。此外,它提供了高速率的能力,保留其初始电容的60%时,电流密度放大20倍。戏剧性地,Ce(COOH)3电极具有超高的循环稳定性,60,000次循环后的电容保持率为107.9%,据我们所知,这是报道的Ce-有机化合物电极中耐久性最高的。优异的电化学性能归因于其固有的晶体结构和独特的形貌。这项工作表明,3D花状Ce(COOH)3具有用于超级电容器应用的巨大潜力,并且可以扩展简便且可扩展的合成策略以生产其他金属-有机复合电极。
An electrode material with high performance, long durability, and low cost for supercapacitors has long been desired in academia and industry. Among all the factors that affect the electrochemical performance and cycling stability of electrode materials, the morphology and intrinsic structure characteristics are the most important. In this study, a novel 3D flower-like Ce(COOH)3 electrode material was designed by taking advantage of the Ce3+ and -COOH groups and fabricated by a one-pot microwave-assisted method. The morphology and structure characteristics of the sample were examined by SEM, EDS, TEM, XRD, FT-IR, XPS, N2 adsorption/desorption techniques, and the electrochemical behaviors were investigated in a three-electrode configuration. The Ce(COOH)3 electrode presents an excellent specific capacitance of 140 F g-1 at 1 A g-1, higher than many other previously reported Ce-based electrodes. In addition, it delivers high rate capability that retains 60% of its initial capacitance when the current density is magnified 20 times. Dramatically, the Ce(COOH)3 electrode exhibits an ultra-high cycling stability with capacitance retention of 107.9% after 60,000 cycles, which is the highest durability among reported Ce-organic compound electrodes to the best of our knowledge. The excellent electrochemical performance is ascribed to its intrinsic crystal structure and unique morphology. This work indicates that the 3D flower-like Ce(COOH)3 has significant potential for supercapacitor applications and the facile and scalable synthesis strategy can be extended to produce other metal-organic composite electrodes.