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Flexible Asymmetric Threadlike Supercapacitors Based on NiCo 2 Se 4 Nanosheet and NiCo 2 O 4 /Polypyrrole Electrodes
Author(s) -
Wang Qiufan,
Ma Yun,
Wu Yunlong,
Zhang Daohong,
Miao Menghe
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201700149
Subject(s) - supercapacitor , nanosheet , materials science , polypyrrole , electrode , capacitance , nanotechnology , optoelectronics , composite material , polymer , polymerization , chemistry
Flexible threadlike supercapacitors with improved performance are needed for many wearable electronics applications. Here, we report a high performance flexible asymmetric all‐solid‐state threadlike supercapacitor with a NiCo 2 Se 4 positive electrode and a NiCo 2 O 4 @PPy (PPy: polypyrrole) negative electrode. The as‐prepared electrodes display outstanding volume specific capacitance (14.2 F cm −3 ) and excellent cycling performance (94 % retention after 5000 cycles at 0.6 mA) owing to their nanosheet and nanosphere structures. The asymmetric all‐solid‐state threadlike supercapacitor expanded the stability voltage window from 0–1.0 V to 0–1.7 V and exhibits high volume energy density (5.18 mWh cm −3 ) and superior flexibility under different bending conditions. This study provides a scalable method for fabricating high performance flexible supercapacitors from easily available materials for use in wearable and portable electronics.