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Reversible faradaic reactions involving redox mediators and oxygen-containing groups on carbon fiber electrode for high-performance flexible fibrous supercapacitors

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Journal of Energy Chemistry 2022年第5期31卷 1-11页

作者： soobeom lee Geon-Hyoung An Department of Energy Engineering Gyeongsang National UniversityJinju 52849Republic of Korea Future Convergence Technology Research Institute Gyeongsang National UniversityJinju 52849Republic of Korea

Flexible fibrous supercapacitors(FFS)are taking account of as the energy storage devices for wearable electronics owing to their high power density,high safety,long cycle life,and simple manufacturing ***,FFSs have the disadvantage of low specific capacitance that results from the electrochemical characteristics of the electrical double layer on the carbon fiber *** this study,for the first time,an FFS comprising surface-activated carbon fibers as an electrode/current collector and a redox additive gel polymer electrolyte(FFS-SARE)was fabricated for use as a wearable energy storage *** FFS-SARE showed outstanding electrochemical performance,namely,high specific capacitances of 891 and 399 mF cm^(-2) at current densities of 70.0 and 400 μA cm^(-2),respectively,and remarkable ultrafast cycling stability over 5000 cycles with 92%capacitance retention at a current density of 400.0 μA cm^(-2).Moreover,they exhibited mechanical flexibility and had high feasibility,and they showed good energy storage performance that renders them suitable for use in wearable electronic textiles.

关键词： Interface engineering Fibrous supercapacitor Redox additive gel polymer electrolyte Porous structure

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Interface Engineering of Carbon Fiber‑Based Electrode for Wearable Energy Storage Devices

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Advanced Fiber Materials 2023年第5期5卷 1749-1758页

作者： soobeom lee Geon‑Hyoung An Department of Energy System Engineering Gyeongsang National UniversityJinju 52828Republic of Korea Department of Energy Engineering Gyeongsang National UniversityJinju 52828Republic of Korea

Carbon-based fibrous supercapacitors(CFSs)have demonstrated great potential as next-generation wearable energy storage devices owing to their credibility,resilience,and high power *** limited specific surface area and low electrical conductivity of the carbon fiber electrode,however,impede its practical *** overcome this challenge,this study fabricated a CFS by sequentially coating graphene,carbon nanotube,and activated carbon on the carbon fiber surface(CF/G/CNT/AC).The CF/G/CNT/AC exhibited excellent electrochemical performance with a specific capacitance of 692 mF cm^(-2)at 70μA cm^(-2)and good cycling stability over 4000 *** result is ascribed to the increase of contact area between the active material and the current ***,the energy density of the as-prepared CF/G/CNT/AC fibrous supercapacitor reaches 86.6 and 37.7μW cm^(-2)at power densities of 126 and 720μW cm^(-2),respectively,demonstrating its potential for practical *** addition,the CF/G/CNT/AC demonstrated favorable traits such as mechanical flexibility,feasibility,and energy storage capacity,qualifying it as a viable alternative for wearable electronic textiles.

关键词： Interface engineering Fibrous supercapacitor Carbon fiber Carbon nanotube Graphene Activated carbon

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Anode surface engineering of zinc-ion batteries using tellurium nanobelt as a protective layer for enhancing energy storage performance

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Journal of Energy Chemistry 2024年第5期92卷 113-123页

作者： soobeom lee Yeonjin Je Boeun Seok Hyun Tae Kim Yong-Ryun Jo Soong Ju Oh Byoungyong Im Dae Guen Kim Sang-Soo Chee Geon-Hyoung An Department of Energy System Engineering Gyeongsang National UniversityJinju 52725Republic of Korea Nano Convergence Materials Center Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea School of Materials Science and Engineering Gyeongsang National UniversityJinju 52828Republic of Korea GIST Advanced Insitute of Instrumental Analysis(GAIA) Electron Microscopy LaboratoryGwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Advanced Materials and Processing Institute for Advanced EngineeringYongin 17180Republic of Korea Department of Energy Engineering Gyeongsang National UniversityJinju 52725Republic of Korea

Over the years,zinc-ion batteries(ZIBs)have attracted attention as a promising next-generation energy storage technology because of their excellent safety,long cycling performance,eco-friendliness,and high-power ***,issues,such as the corrosion and dissolution of the Zn anode,limited wet-tability,and lack of sufficient nucleation sites for Zn plating,have limited their practical *** introduction of a protective layer comprising of tellurium(Te)nanobelts onto the surface of Zn anode has emerged as a promising approach to overcome these limitations and improve the electrochemical behav-ior by enhancing the safety and wettability of ZIBs,as well as providing numerous nucleation sites for Zn *** the presence of a Te-based protective layer,the energy power density of the surface-engineered Zn anode improved significantly(ranging from 310 to 144 W h kg^(-1),over a power density range of 270 to 1,800 W kg^(-1)),and the lifespan capability was *** results demonstrate that the proposed strategy of employing Te nanobelts as a protective layer holds great promise for enhancing the energy storage performance of zIBs,making them even more attractive as a viable energy storage solution forthefuture.

关键词： Zn ion battery Anode Protective layer Tellurium Nanobelt

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