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Preparation and Supercapacitor Performance of Freestanding Polypyrrole/Polyaniline Coaxial Nanoarrays
Author(s) -
Xie Yibing,
Wang Dan,
Ji Jingjing
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500460
Subject(s) - supercapacitor , polypyrrole , polyaniline , capacitance , materials science , pseudocapacitance , coaxial , nanotechnology , coating , nanopore , nanorod , chemical engineering , composite material , electrode , polymerization , polymer , chemistry , computer science , engineering , telecommunications
The flexible, freestanding polypyrrole/polyaniline (PPy/PANI) coaxial nanoarray was prepared by removing a titania (TiO 2 ) sacrificial template from PPy/TiO 2 /PANI, which was initially formed by selectively coating PPy and PANI on the outer and inner surfaces of individual TiO 2 nanotubes. PPy/PANI formed a hybrid coaxial structure of PANI nanorods encased in PPy nanopores. The PPy/PANI coaxial nanoarray exhibited a specific capacitance of 209.5 F g −1 at 0.5 A g −1 , presenting higher performance than the PPy nanopore array (114.2 F g −1 ). Its capacitance decreased from 157.5 to 125.2 F g −1 after 500 cycles at 2.0 A g −1 , presenting a reasonable capacitance retention of 79.5 %. The flexible supercapacitor based on the PPy/PANI coaxial nanoarray demonstrated a specific capacitance of 66 F g −1 at 0.5 A g −1 . The PPy/PANI coaxial nanoarray exhibited high pseudocapacitance, moderate cyclibility, and good flexibility, suggesting its promising application in flexible energy storage devices.