Anand Samika, Devi Kalathiparambil Rajendra Pai Sunaja, Kumar Abhishek, V Yelamaggad Channabasaveshwar
Department of Chemistry, Christ University, Bangalore 560029, Karnataka, India.
Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, Karnataka, India.
ACS Omega. 2024 Sep 20;9(40):41807-41818. doi: 10.1021/acsomega.4c06108. eCollection 2024 Oct 8.
In recent years, pseudocapacitive materials have been investigated rigorously as they provide a unique pathway for realizing high-energy and high-power densities. However, innovative approaches involving rational design and synthesis of new materials are still vital to address concerns such as degradation, low conductivity, low cycling performance, high resistance, production cost, etc. Working in this direction, we report the cost-effective synthesis, characterization, and excellent pseudocapacitive behavior of a Cd(II)-based coordination polymer (COP) abbreviated as Cd(DAB). It has been realized in quantitative yield through a facile one-pot reaction occurring among the N4-ligand, 3,3'-diaminobenzidine (DAB), and Cd(II) ions, derived from Cd(OAc)·2HO, at room temperature. The proposed structure of the COP was ascertained by subjecting it to various standard spectroscopic and electron microscopic studies; these techniques reveal the self-assembly of indefinitely long coordination strands into a two-dimensional (2D) layered structure. The electrochemical performance of Cd(DAB) was evaluated as an electrode material for supercapacitors. Owing to its high conductivity, it portrayed remarkable energy storage (pseudocapacitor) behavior; it exhibited a high specific capacitance of 1341.6 F g and a long cycle life with 81% retention over 10,000 cycles at 20 A g. Additionally, an asymmetrical supercapacitor device was fabricated, which exhibited a specific capacitance of 428.5 F g at a current density of 1 A g.
近年来，赝电容材料受到了深入研究，因为它们为实现高能量和高功率密度提供了一条独特的途径。然而，涉及合理设计和合成新材料的创新方法对于解决诸如降解、低导电性、低循环性能、高电阻、生产成本等问题仍然至关重要。朝着这个方向努力，我们报道了一种基于镉（II）的配位聚合物（COP）（简称为Cd（DAB））的经济高效合成、表征及其优异的赝电容行为。它是通过在室温下，由Cd（OAc）·2HO衍生的N4配体3,3'-二氨基联苯胺（DAB）与镉（II）离子之间发生的简便一锅法反应，以定量产率实现的。通过对该COP进行各种标准光谱和电子显微镜研究确定了其提议的结构；这些技术揭示了无限长的配位链自组装成二维（2D）层状结构。评估了Cd（DAB）作为超级电容器电极材料的电化学性能。由于其高导电性，它表现出显著的储能（赝电容器）行为；它在20 A g下表现出1341.6 F g的高比电容和长循环寿命，在10000次循环中保持率为81%。此外，制备了一种不对称超级电容器装置，在1 A g的电流密度下表现出428.5 F g的比电容。
