Publications논문

Ag/MnO2 Composite Sheath-Core Structured Yarn Supercapacitors
2019-11-13 17:33:25 조회수254
Ji Hwan Kim(1), Changsoon Choi(1,2), Jae Myeong Lee(1), Mônica Jung de Andrade(3), Ray H. Baughman(3) & Seon Jeong Kim(1) 1Center for Self-powered Actuation, Department of Biomedical Engineering, Hanyang University, Seoul, 04763, Korea. 2Division of Smart Textile Convergence Research, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Korea. 3The Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX, 75083, USA. Ji Hwan Kim and Changsoon Choi contributed equally. Correspondence and requests for materials should be addressed to S.J.K. 원문 링크 : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6127153/

Abstract

One-dimensional (1D) yarn or fiber-based supercapacitors that have small diameter, volume and high mechanical strength are needed due to the demands on power source for wearable electronics, micro-devices, and implantable medical devices. The composite sheath is fabricated on a commercially available CNT yarn substrate by alternating depositions of MnO2 and Ag layers. Synergistic effect of high loading level of pseudocapacitive MnO2 and reasonably improved rate-capability are achieved. In the composite sheath, the interconnected networks provide electrical contact between MnO2 aggregates and adjacent Ag layer. The conductive Ag inter layers shorten the solid-state charge diffusion length in the MnO2. Moreover, generated electrons during the charge/discharge process can be collected rapidly by the adjacent Ag layer, therefore, the great extents of MnO2 could be loaded onto the surface of CNT core fiber electrode without a significant rate-capability degradation. Due to the high MnO2 loading level, the composite sheath-core yarn supercapacitor showed excellent specific areal capacitance (322.2 mF/cm2) and according energy density (18.3 µWh/cm2).
 

 
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