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Flexible Asymmetric Micro‐Supercapacitors Based on Bi 2 O 3 and MnO 2 Nanoflowers: Larger Areal Mass Promises Higher Energy Density
Author(s) -
Xu Henghui,
Hu Xianluo,
Yang Huiling,
Sun Yongming,
Hu Chenchen,
Huang Yunhui
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201401882
Subject(s) - supercapacitor , materials science , electrode , power density , capacitance , electrical conductor , area density , energy density , high mass , nanotechnology , optoelectronics , voltage , engineering physics , electrical engineering , power (physics) , composite material , physics , quantum mechanics , astrophysics , engineering
A flexible asymmetric supercapacitor (ASC) with high energy density is designed and fabricated using flower‐like Bi 2 O 3 and MnO 2 grown on carbon nanofiber (CNF) paper as the negative and positive electrodes, respectively. The lightweight (1.6 mg cm −2 ), porous, conductive, and flexible features make the CNF paper an ideal support for guest active materials, which permit a large areal mass of 9 mg cm −2 for Bi 2 O 3 (≈85 wt% of the entire electrode). Thus, the optimal device with an operation voltage of 1.8 V can deliver a high energy density of 43.4 μWh cm −2 (11.3 W h kg −1 , based on the total electrodes) and a maximum power density of 12.9 mW cm −2 (3370 W kg −1 ). This work provides an example of large areal mass and flexible electrode for ASCs with high areal capacitance and high energy density, holding great promise for future flexible electronic devices.