Khan Junaid, Ahmed Anique, Al-Kahtani Abdullah A
Department of Physics Government Postgraduate Collage No. 1 Abbottabad Khyber Pakhtunkhwa Pakistan
Department of Higher Education Achieves and Libraries, Government of Khyber Pakhtunkhwa Pakistan.
RSC Adv. 2025 Apr 11;15(15):11441-11450. doi: 10.1039/d5ra01653c. eCollection 2025 Apr 9.
In this work, to address the issue of poor conductivity in COFs, a layered porous composite (EG@COF) was successfully synthesized. A redox-active COF (DAAQ-TFP COF) was grown on the surface of expanded graphite (EG) through a solvent-free synthesis. SEM analysis displayed that the obtained composite (EG@COF) possessed a layered porous structure. Further investigations revealed that EG not only improved electrical conductivity but also regulated the pore size of the COFs. This structure was highly conducive to enhancing the specific capacitance of the electrode material. An electrochemical study demonstrated that the specific capacitance of EG@COF-3 reached 351 C g at 1 A g, with 94.4% capacitance retention after 10 000 cycles. The excellent capacitance retention was attributed to the stable backbone of the COF. Meanwhile, an asymmetric supercapacitor (ACS) comprising activated carbon (AC) and EG@COF exhibited an energy density of 16.4 W h kg at a power density of 806.0 W kg.
在这项工作中，为了解决共价有机框架（COFs）导电性差的问题，成功合成了一种层状多孔复合材料（EG@COF）。通过无溶剂合成法，在膨胀石墨（EG）表面生长了一种具有氧化还原活性的COF（DAAQ-TFP COF）。扫描电子显微镜（SEM）分析表明，所得复合材料（EG@COF）具有层状多孔结构。进一步研究发现，EG不仅提高了导电性，还调节了COFs的孔径。这种结构非常有利于提高电极材料的比电容。电化学研究表明，EG@COF-3在1 A g下的比电容达到351 C g，在10000次循环后电容保持率为94.4%。优异的电容保持率归因于COF稳定的骨架结构。同时，由活性炭（AC）和EG@COF组成的非对称超级电容器（ACS）在功率密度为806.0 W kg时，能量密度为16.4 W h kg。
