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Free-standing Sandwich Structure MoO3-rGO Composite Film Electrode for Flexible Supercapacitors

Published online by Cambridge University Press:  13 June 2019

Le Yu ,
Shixi Zhao ,
Qilong Wu ,
Xiaoxiao Zheng ,
Yifeng Wang  and
Guodan Wei
Le Yu
Affiliation:
Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, P. R. China School of Materials Science and Engineering, Tsinghua University, Beijing100084, P. R. China
Shixi Zhao*
Affiliation:
Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, P. R. China
Qilong Wu
Affiliation:
Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, P. R. China School of Materials Science and Engineering, Tsinghua University, Beijing100084, P. R. China
Xiaoxiao Zheng
Affiliation:
Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, P. R. China School of Materials Science and Engineering, Tsinghua University, Beijing100084, P. R. China
Yifeng Wang
Affiliation:
Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, P. R. China School of Materials Science and Engineering, Tsinghua University, Beijing100084, P. R. China
Guodan Wei*
Affiliation:
Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518057, P. R. China
*
*(Email: weiguodan@sz.tsinghua.edu.cn)
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Abstract

The research of high-performance flexible supercapacitors is urgent due to the rapid development of wearable and portable electronics. The key challenge is the preparation of flexible electrodes with high areal capacitance since electrodes are the most important part of supercapacitors. Compared to those conventional electrodes loading with typical flexible substrates such as textile, PET, paper et al, free-standing electrodes have many advantages such as more efficient capacity contribution, solidly embedded active materials and thinner thickness. Herein, we have successfully fabricated a novel sandwich-like structure free-standing MoO3-rGO (reduced graphene oxide) composite film electrode for flexible supercapacitors using simple vacuum filtration method followed by HI reduction process. The obtained MoO3-rGO composite film electrode shows excellent electrochemical performance, whose areal specific capacitance reaches 8972 mF·cm-2 (1.5 mA·cm-2). Here, MoO3 provides pseudocapacitance and rGO provides double-layer capacitance. After cycling for 2000 cycles, the capacity retention is 86.7%, showing good cycle stability. Besides, the as-prepared composite film has good flexibility and will not break easily during following bending, rolling, folding or twisting steps. This study has been approved to be an important step for the high-performance electrode design for free-standing flexible supercapacitors.

Keywords

graphenestoragehydrothermalflexible
Type
Articles
Information
MRS Advances , Volume 4 , Issue 41-42: Electronics and Photonics , 2019 , pp. 2299 - 2305
Copyright
Copyright © Materials Research Society 2019 

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