Premium
High Electrochemical Capacitance by Chemically Grafting Polyaniline Chains onto an Aniline‐Functionalized Graphene Oxide/TiO 2 Nanotubes/Titanium Electrode
Author(s) -
Faraji Masoud,
Hasanzadeh Reza
Publication year - 2017
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.201700146
Subject(s) - polyaniline , graphene , materials science , cyclic voltammetry , dielectric spectroscopy , nanocomposite , oxide , chemical engineering , electrode , scanning electron microscope , electrochemistry , nanotechnology , composite material , chemistry , polymer , engineering , metallurgy , polymerization
Abstract A nanocomposite electrode composed of polyaniline and graphene oxide (PANI‐ g ‐GO) was prepared by grafting polyaniline chains onto aniline‐functionalized graphene oxide deposited on TiO 2 nanotubes/Ti electrode. The surface morphology of the fabricated electrode was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and their electrochemical activity was investigated using cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). TEM and SEM results revealed that the PANI nanoparticles were uniformly loaded on the graphene sheets. The PANI‐ g ‐GO/TiO 2 nanotubes/Ti electrodes exhibited a maximum specific capacitance of 816 F g −1 at a current density of 7.0 A g −1 with 88 % capacitance retention after 2000 charge/discharge processes in 1.0 m H 2 SO 4 solution, which is attributed to the synergistic effect of PANI/GO, good covalent bonding between PANI/GO, and a unique nanocomposite microstructure with high surface area.