Large-Scale, Lightweight, and Robust Nanocomposites Based on Ruthenium-Decorated Carbon Nanosheets for Deformable Electrochemical Capacitors
- Authors
- Jun, Jong Han; Lee, Yu-Ki; Kim, Juhee; Song, Hyeonjun; Jeong, Youngjin; Kim, Changsoon; Lee, Ji-Hoon; Choi, In-Suk
- Issue Date
- Mar-2022
- Publisher
- AMER CHEMICAL SOC
- Keywords
- ruthenium; carbon nanotube sheets; deformable electrochemical capacitors; large-scale electrode; energy storage
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.14, no.10, pp.12193 - 12203
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 14
- Number
- 10
- Start Page
- 12193
- End Page
- 12203
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/43654
- DOI
- 10.1021/acsami.1c23455
- ISSN
- 1944-8244
- Abstract
- Despite the increase in demand for deformable electrochemical capacitors as a power source for wearable electronics, significant obstacles remain in developing these capacitors, including their manufacturing complexity and insufficient deformability. With recognition of these challenges, a facile strategy is proposed to fabricate large-scale, lightweight, and mechanically robust composite electrodes composed of ruthenium nanoparticles embedded in freestanding carbon nanotube (CNT)-based nanosheets (Rupa-CNTs). Surface-modified CNT sheets with hierarchical porous structures can behave as an ideal platform to accommodate a large number of uniformly distributed Ru nanoparticles (Ru/CNT weight ratio of 5:1) while improving compatibility with aqueous electrolytes. Accordingly, Ru@a-CNTs offer a large electrochemically active area, showing a high specific capacitance (similar to 253.3 F g(-1)) and stability for over 2000 cycles. More importantly, the exceptional performance and mechanical durability of quasi-solid-state capacitors assembled with Rupa-CNTs and a PVA-H3PO4 hydrogel electrolyte are successfully demonstrated in that 94% of the initial capacitance is retained after 100 000 cycles of bending deformation and a commercial smartwatch is charged by multiple cells. The feasible large-scale production and potential applicability shown in this study provide a simple and highly effective design strategy for a wide range of energy storage applications from small- to large-scale wearable electronics.
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