Sono-Cavitation and Nebulization-Based Synthesis of Conjugated Microporous Polymers for Energy Storage Applications
journal contributionposted on 20.12.2021, 13:40 authored by Deok-Ho Roh, HyeonOh Shin, Hyun-Tak Kim, Tae-Hyuk Kwon
Conjugated microporous polymers (CMPs) are promising energy storage materials owing to their rigid and cross-linked microporous structures. However, the fabrication of nano- and microstructured CMP films for practical applications is currently limited by processing challenges. Herein, we report that combined sono-cavitation and nebulization synthesis (SNS) is an effective method for the synthesis of CMP films from a monomer precursor solution. Using the SNS, the scalable fabrication of microporous and redox-active CMP films can be achieved via the oxidative C–C coupling polymerization of the monomer precursor. Intriguingly, the ultrasonic frequency used during SNS strongly affects the synthesis of the CMP films, resulting in an approximately 30% improvement in reaction yields and ca. 1.3–1.7-times enhanced surface areas (336–542 m2/g) at a high ultrasonic frequency of 180 kHz compared to those at 120 kHz. Furthermore, we prepare highly conductive, three-dimensional porous electrodes [CMP/carbon nanotube (CNT)] by a layer-by-layer sequential deposition of CMP films and CNTs via SNS. Finally, an asymmetric supercapacitor comprising the CMP/CNT cathode and carbon anode shows a high specific capacitance of 477 F/g at 1 A/g with a wide working potential window (0–1.4 V) and robust cycling stability, exhibiting 94.4% retention after 10,000 cycles.
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ultrasonic frequency usedrobust cycling stabilityprepare highly conductivehigh ultrasonic frequencyhigh specific capacitancedimensional porous electrodesasymmetric supercapacitor comprising336 – 542carbon anode shows180 khz comparedsns strongly affectslinked microporous structuresconjugated microporous polymers3 – 10 – 1monomer precursor solutionlayer sequential depositionmicrostructured cmp filmsactive cmp filmscnts via snsmonomer precursorcmp filmscarbon nanotubeachieved via120 khzreaction yieldsprocessing challengespractical applicationsexhibiting 94effective methodcurrently limitedcnt cathodecnt )]approximately 30477 f000 cycles