Utilizing hybrid faradaic mechanism via catalytic and surface interactions for high-performance flexible energy storage system

Dong Gyu Lee, Hyeonggeun Choi, Yeonsu Park, Min Cheol Kim, Jong Bae Park, Suok Lee, Younghyun Cho, Wook Ahn, A. Rang Jang, Jung Inn Sohn, John Hong, Young Woo Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Improving the capacitance and energy density is a significant challenge while developing practical and flexible energy storage system (ESS). Redox mediators (RMs), as redox-active electrolyte additives, can provide additional energy storing capability via electrochemical faradaic contribution on electrodes for high-performance flexible ESSs. Particularly, determining effective material combinations between electrodes and RMs is essential for maximizing surface faradaic redox reactions for energy-storage performance. In this study, an electrode-RM system comprising heterostructured hybrid (carbon fiber (CF)/MnO2) faradaic electrodes and iodine RMs (I-RMs) in a redox-active electrolyte is investigated. The CF/MnO2 with the I-RMs (CF/MnO2-I) induces dominant catalytic faradaic interaction with the I-RMs, significantly enhancing the surface faradaic kinetics and increasing the overall energy-storage performance. The CF/MnO2-I ESSs show a 12.6-fold (or higher) increased volumetric energy density of 793.81 mWh L−1 at a current of 10 µA relative to ESSs using CF/MnO2 without I-RMs (CF/MnO2). Moreover, the CF/MnO2-I retains 93.1% of its initial capacitance after 10,000 cycles, validating the excellent cyclability. Finally, the flexibility of the ESSs is tested at different bending angles (180° to 0°), demonstrating its feasibility for flexible and high-wear environments. Therefore, CF/MnO2 electrodes present a practical material combination for high-performance flexible energy-storage devices owing to the catalytic faradaic interaction with I-RMs.

Original languageEnglish
Pages (from-to)541-548
Number of pages8
JournalJournal of Energy Chemistry
Volume83
DOIs
StatePublished - Aug 2023

Keywords

  • Catalytic interactions
  • Energy storage system
  • Faradaic electrodes
  • Mechanical stability
  • Redox mediators

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