Abstract
Carbon fiber electrodes were prepared by grafting anthraquinone molecules via a scalable electrochem-ical approach which simultaneously increased interfacial and electrochemical capacitance properties.In this work,anthraquinone diazonium salts were synthesized and grafted onto carbon fiber tows at var-ious concentrations.These modified fibers were subsequently evaluated mechanically and electrochem-ically to analyze their suitability in structural supercapacitors.Compared to control fibers,the grafted anthraquinone groups resulted in a 30％increase in interfacial shear strength(IFSS)and 6.6x increase in specific capacitance.Industry application was also a focus thus carbon fibers were also modified with in-situ generated diazonium salts to determine the applicability to an in-line industrial process.Specifically,potentiostatic functionalization of fibers with in-situ generated diazonium salts AQ-1 and AQ-2,showed 3x and 4.3 x increase in specific capacitance,respectively,relative to unmodified carbon fiber(CF).We expect that implementing a scalable method to introduce a conductive and electrochemically active cova-lently bound surface chemistry layer onto carbon fiber exhibits a higher specific capacitance than carbon fiber grafted with most other small molecules reported in literature.This will open new avenues for manufacturing multifunctional and high-performance fibers with tailored properties for specific/targeted applications.
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