Qin Zhao, Xu Yanqin, Liu Lin, Liu Min, Zhou Hanjun, Xiao Liyue, Cao Yuan, Chen Changguo
School of Chemistry and Chemical Engineering, Chongqing University Chongqing 400044 China
Chongqing Academy of Metrology and Quality Inspection Chongqing 401121 China.
RSC Adv. 2022 Oct 12;12(45):29177-29186. doi: 10.1039/d2ra04939b. eCollection 2022 Oct 11.
Electrodes for supercapacitors made from metal-organic frameworks (MOFs) are still hindered by electron transfer properties. Therefore, an electrode composite material Ni-MOF@PPy was synthesized from a Ni-based metal-organic framework (Ni-MOF) doped with poly-pyrrole (PPy) using a simple chemical oxidation method to improve its electron transfer property. After introducing the electrochemically active substance KFe(CN) into the electrolyte, the composite material had a specific capacitance of 1815.4 F g at a current density of 1 A g. Ni-MOF@PPy and active carbon (AC) as the positive and negative electrodes have been used, respectively, to assemble asymmetric supercapacitors (ASCs) in the KOH and KFe(CN) mixed electrolyte. This novel Ni-MOF@PPy//AC ASC energy storage device can provide 38.5 W h kg energy density, 7001 W kg power density, and 90.2% capacitance retention after 3000 cycles. Therefore, Ni-MOF@PPy//AC ASC is an excellent energy storage device with practical and economic value. The synergistic effect strategy proposed in this work can be easily applied to develop other MOFs with unique crystal structures as well as other redox active additives, providing new avenues and research ideas for exploring novel energy storage devices.
由金属有机框架（MOF）制成的超级电容器电极仍受电子转移特性的阻碍。因此，采用简单的化学氧化法，由掺杂聚吡咯（PPy）的镍基金属有机框架（Ni-MOF）合成了一种电极复合材料Ni-MOF@PPy，以改善其电子转移性能。在将电化学活性物质KFe(CN)引入电解质后，该复合材料在电流密度为1 A g时的比电容为1815.4 F g。分别使用Ni-MOF@PPy和活性炭（AC）作为正负极，在KOH和KFe(CN)混合电解质中组装了不对称超级电容器（ASC）。这种新型的Ni-MOF@PPy//AC ASC储能装置可提供38.5 W h kg的能量密度、7001 W kg的功率密度，并且在3000次循环后电容保持率为90.2%。因此，Ni-MOF@PPy//AC ASC是一种具有实用和经济价值的优异储能装置。本文提出的协同效应策略可轻松应用于开发具有独特晶体结构的其他MOF以及其他氧化还原活性添加剂，为探索新型储能装置提供了新途径和研究思路。
