TY - JOUR
T1 - High-rate supercapacitor using magnetically aligned graphene
AU - Lin, Shiqi
AU - Tang, Jie
AU - Zhang, Kun
AU - Suzuki, Tohru S.
AU - Wei, Qingshuo
AU - Mukaida, Masakazu
AU - Zhang, Youcheng
AU - Mamiya, Hiroaki
AU - Yu, Xiaoliang
AU - Qin, Lu Chang
N1 - Funding Information:
This work was supported by JST ALCA Program , JSPS Grants-in-aid for Scientific Research (No. 22310074 ), and JSPS Kakenhi (No. JP17K14089 ). A part of this work was also supported by the NIMS Microstructural Characterization Platform as a program of the “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) , Japan.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - Graphene has been widely used as an electrode material for supercapacitors. However, parallelly-stacked graphene layers often result in inefficient ion diffusion and electron transfers that usually reduce the rate capability of a supercapacitor. In this study, reduced graphene oxide (rGO) and poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) composite films were prepared by a solvent evaporation method using PEDOT:PSS as the binder to fix aligned graphene for its good conductivity and strong π-π stacking interactions with the graphene sheets. Analyses using scanning electron microscopy (SEM), nitrogen adsorption-desorption, and small-angle X-ray scattering show that the graphene sheets were well aligned when a magnetic field was applied, though they were oriented randomly without the magnetic field. As a capacitor electrode material, the aligned rGO shows a specific capacitance of 169 F g−1 with a capacitance retention of about 70% at a current density of 50 A g−1 and its cyclic voltammetry (CV) loops maintained a rectangular shape at a voltage scan rate of 2 V s−1. The aligned rGO electrode can help break through the limitations of traditional supercapacitors and increase significantly their charge/discharge rate and power density.
AB - Graphene has been widely used as an electrode material for supercapacitors. However, parallelly-stacked graphene layers often result in inefficient ion diffusion and electron transfers that usually reduce the rate capability of a supercapacitor. In this study, reduced graphene oxide (rGO) and poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) composite films were prepared by a solvent evaporation method using PEDOT:PSS as the binder to fix aligned graphene for its good conductivity and strong π-π stacking interactions with the graphene sheets. Analyses using scanning electron microscopy (SEM), nitrogen adsorption-desorption, and small-angle X-ray scattering show that the graphene sheets were well aligned when a magnetic field was applied, though they were oriented randomly without the magnetic field. As a capacitor electrode material, the aligned rGO shows a specific capacitance of 169 F g−1 with a capacitance retention of about 70% at a current density of 50 A g−1 and its cyclic voltammetry (CV) loops maintained a rectangular shape at a voltage scan rate of 2 V s−1. The aligned rGO electrode can help break through the limitations of traditional supercapacitors and increase significantly their charge/discharge rate and power density.
KW - Graphene
KW - High-rate performance
KW - Supercapacitor
KW - Vertical alignment
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U2 - 10.1016/j.jpowsour.2020.228995
DO - 10.1016/j.jpowsour.2020.228995
M3 - Article
AN - SCOPUS:85091628019
SN - 0378-7753
VL - 482
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 228995
ER -
