Fabrication of Core-shell Structured Hybrid GO/CNT - PEDOT:PSS Fiber for Energy Storage Application

Abstract

i MS/MS 20201152 Minju Choi. Fabrication of Core-shell Structured Hybrid GO/CNT-PEDOT:PSS Fiber for Energy Storage Application (탄소나노튜브와 PEDOT:PSS를 이용한 코어쉘 구조의 하이브리드 섬유 제작 및 에너지 저장 소자로의 응용). School of Material Sciences and Engineering. 2022. 50p. Prof. Myung-Han Yoon. Abstract Recently, as increasing interest in wearable electronic devices and miniaturization of electronic devices, the pursuit of fiber-type supercapacitors with light weight, flexibility and superior power density is emerging. Single composed pseudocapacitors with fiber shape have limitations such as IR drop and capacitive degradation. Hybrid with superior electrically conductive materials can boost energy storage capability of pseudocapacitance with high electrical conductivity collecting current to enhance long-distance charge transport and electron collection. Herein, we fabricated core-shell structured hybrid GO (Graphene Oxide) / CNT-PEDOT:PSS (poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate)) fiber for energy storage application with enhanced wettability of CNT fiber. By fabricating twisted yarn-shaped with the fibers, length capacitance was increased by utilizing the ion accessible entire volume. The resultant of the hybrid fiber exhibits excellent performance in fiber type supercapacitor exhibiting high capacitance even at high loaded mass, ~120 F/cm3, 3.32 mF/cm (single strand) and 31.66 mF/cm (8 strands yarn) as well as negligible voltage drop, 0.113 V at 10 A/cm3 in 5 cm long. Furthermore, due to the self-fusion property of PEDOT:PSS, it has not only versatility of application but scalability.