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Electrodeposition of alpha-MnO2/gamma-MnO2 on Carbon Nanotube for Yarn Supercapacitor

Title
Electrodeposition of alpha-MnO2/gamma-MnO2 on Carbon Nanotube for Yarn Supercapacitor
Author
김선정
Keywords
MANGANESE OXIDES; FIBER; WIRE; NANOWIRES
Issue Date
2019-08
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 9, article no. 11271
Abstract
Yarn supercapacitors have attracted renewed interest as promising energy storage for wearable devices due to their lightweight, long cycling lifetime and excellent weavability. There has been much effort to fabricate high performance yarn supercapacitor by depositing pseudo-capacitive materials on the outer surface of the carbon fibers. However, a key challenge still remains to achieve high capacitance and high mass loading without sacrificing the cycling stability. Herein, we perform a phase-controlled of MnO2 at various deposition temperatures with ultrahigh mass loading of 11 mg/cm(2) on a MWNT sheets and fabricate it to yarn structure to achieve high capacitance without decreasing in the electrochemical performance. The structure of optimized sample (MnO2/CNTs-60, deposition at 60 degrees C) consists of the composite of primary alpha-MnO2 nanosheets and secondary gamma-MnO2 nanoparticles. The heteronanostructures of MnO2 provide facile ionic and electric transport in the yarn electrode, resulting in improvement of electrochemical performance and cycling stability. The MnO2/CNTs-60 yarn electrode with ultrahigh mass loading delivers a high areal capacitance of 3.54 F/cm(2) at 1 mA/cm(2) and an excellent rate capability. Finally, the MnO2/CNTs-60 device exhibits an outstanding high areal energy density of 93.8 mu Wh/cm(2) at the power density of 193 mu W/cm(2), which is superior to previously reported symmetric yarn supercapacitors.
URI
https://www.nature.com/articles/s41598-019-47744-xhttps://repository.hanyang.ac.kr/handle/20.500.11754/153567
ISSN
2045-2322
DOI
10.1038/s41598-019-47744-x
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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