Abstract Coordination polymers and metal–organic frameworks have attracted immense attention across different fields of science as materials with numerous functional applications. Herein, we report the use of coordination polymers obtained from near-isostructural metal (Mn2+, Fe2+, and Co2+) bipyridine complexes as electrode materials in a symmetric supercapacitor test cell. The variation in the central metal ion (Mn2+ vs. Fe2+ vs. Co2+) in these nearly identical coordination complexes was found to dictate the capacitive performance of the coordination polymers obtained via Pd(II) cross-linking. The central metal ion not only influences the porosity, Brunauer–Emmett–Teller (BET) surface area (6.5 (Mn), 10.4 (Fe), and 29.7 (Co) m2/g), and the areal capacitance, but also the performance parameters such as the cycling stability and charge–discharge kinetics as well as the charge transfer mechanism. A 3:4:5 ratio for the areal capacitance values (9.1 (Mn), 12.2 (Fe), and 15.4 (Co) mF cm−2 at a scan rate of 5 mV/s) corroborates the modulative effect of the metal center. The cycling stabilities of these coordination polymers also followed the same order. At higher current densities (>0.50 mA cm−2), the supercapacitors fabricated from the Mn-coordination polymer were found to charge and discharge at faster rates, whereas those fabricated from Fe- or Co-coordination polymers continued to discharge at similar rates, indicating similar pore volumes for the latter as confirmed by BET surface area measurements. Although the materials used in this study resulted in modest capacitive performance, the possibilities to enhance their surface area and crystallinity is envisaged to result in the development of new, multifunctional non-carbon electrode materials with efficient electrochemical storage characteristics and tunable electro-optical properties.

中文翻译：

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近等结构配合物衍生的电致变色配位聚合物中金属离子诱导的电容调制

摘要 配位聚合物和金属有机骨架作为具有多种功能应用的材料，在不同科学领域引起了极大的关注。在此，我们报告了使用从近等结构金属（Mn2+、Fe2+ 和 Co2+）联吡啶配合物获得的配位聚合物作为对称超级电容器测试电池中的电极材料。发现这些几乎相同的配位络合物中中心金属离子（Mn2+ vs. Fe2+ vs. Co2+）的变化决定了通过 Pd(II) 交联获得的配位聚合物的电容性能。中心金属离子不仅影响孔隙率、Brunauer-Emmett-Teller (BET) 表面积（6.5 (Mn)、10.4 (Fe) 和 29.7 (Co) m2/g）和面积电容，以及循环稳定性和充放电动力学以及电荷转移机制等性能参数。3:4:5 的面积电容值（9.1 (Mn)、12.2 (Fe) 和 15.4 (Co) mF cm-2，扫描速率为 5 mV/s）证实了金属中心的调制效应. 这些配位聚合物的循环稳定性也遵循相同的顺序。在更高的电流密度 (>0.50 mA cm−2) 下，发现由 Mn 配位聚合物制成的超级电容器以更快的速率充电和放电，而由 Fe 或 Co 配位聚合物制成的超级电容器继续以相似的速率放电，表明后者的孔体积与 BET 表面积测量结果相似。尽管本研究中使用的材料导致了适度的电容性能，