Khan Shabnam, Lone Aadil Rashid, Khan Mohammad Yasir, Rahaman Sabiar, Pandey Kavita, Helal Aasif, Sama Farasha, Shahid M
Interdisciplinary Research Center for Hydrogen Technologies and Carbon Management (IRC-HTCM), King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
Centre for Nano and Soft Matter Sciences (CeNS), Shivanapura, Bangalore 562162, India.
Langmuir. 2024 Oct 8;40(40):21106-21119. doi: 10.1021/acs.langmuir.4c02522. Epub 2024 Sep 25.
The present work summarizes the fabrication of an amine-functionalized cadmium-based metal-organic framework (MOF), {[Cd(AT)(BP)]·4DMF} or , by adopting a simple solvothermal approach using 2-aminoterephthalic acid (AT) as the main linker, while 4,4'-bipyridyl (BP) as an auxiliary linker. The structure of was validated by the single-crystal X-ray diffraction technique that revealed the formation of an overall three-dimensional network with BP acting as a bridge between the 2D sheets of the MOF. The robust framework of decorated with a free amine functional group was utilized for energy storage application. The electrochemical measurements of revealed a maximum areal capacitance of 9.8 mF/cm at a scan rate of 5 mV/s. Further, to enhance the practical utility of in energy storage devices, two composites of with reduced graphene oxide (rGO) and multiwalled carbon nanotubes (CNTs), viz., and , were prepared by adopting a facile ultrasonication approach. The synthesized and composites displayed an impressive areal capacitance of 117 and 37 mF/cm (58.5 and 17.5 F/g) at a scan rate of 5 mV/s, respectively, and a capacitance retention of up to 118 and 100% after 5000 cycles at a constant current density of 5 mA/cm. The highest energy density of about 4.23 mW h/cm (2.12 W h/kg) at a current density of 1 mA/cm was shown by among all the three materials attributable to the layered structure of rGO, providing a larger surface area accessible for ion adsorption. Enticed by the remarkable outcomes exhibited by , we fabricated a two-electrode asymmetric supercapacitor (ASC) device. The developed ASC device revealed energy and power densities of 26.7 mW h/cm (13.4 W h/kg) and 3760 mW/cm (1880 W/kg), respectively, with a galvanostatic charge-discharge stability of up to 10,000 cycles. The findings identify as a potential contender for future-generation supercapacitors.
本工作总结了一种胺官能化镉基金属有机框架（MOF）{[Cd(AT)(BP)]·4DMF}的制备方法，该方法采用简单的溶剂热法，以2-氨基对苯二甲酸（AT）作为主要连接体，4,4'-联吡啶（BP）作为辅助连接体。通过单晶X射线衍射技术验证了其结构，该技术揭示了形成了一个整体的三维网络，其中BP作为MOF二维片层之间的桥梁。具有游离胺官能团修饰的坚固框架被用于储能应用。对其进行的电化学测量显示，在扫描速率为5 mV/s时，最大面积电容为9.8 mF/cm²。此外，为了提高其在储能器件中的实际应用价值，采用简便的超声处理方法制备了两种与还原氧化石墨烯（rGO）和多壁碳纳米管（CNT）的复合材料，即 和 。合成的 和 复合材料在扫描速率为5 mV/s时，分别显示出令人印象深刻的面积电容117和37 mF/cm²（58.5和17.5 F/g），并且在5 mA/cm²的恒定电流密度下经过5000次循环后，电容保持率分别高达118%和100%。在这三种材料中， 由于rGO的层状结构提供了更大的可用于离子吸附的表面积，在电流密度为1 mA/cm²时显示出约4.23 mW h/cm²（2.12 W h/kg）的最高能量密度。受 所展示的显著成果的吸引，我们制备了一种两电极不对称超级电容器（ASC）器件。所开发的ASC器件分别显示出能量密度和功率密度为26.7 mW h/cm²（13.4 W h/kg）和3760 mW/cm²（1880 W/kg），恒电流充放电稳定性高达10000次循环。这些发现表明 是下一代超级电容器的潜在竞争者。
