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Electrochemically Synthesized Polypyrrole/Graphene Composite Film for Lithium Batteries
Author(s) -
Yang Yang,
Wang Caiyun,
Yue Binbin,
Gambhir Sanjeev,
Too Chee O.,
Wallace Gordon G.
Publication year - 2012
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.201100449
Subject(s) - graphene , materials science , polypyrrole , raman spectroscopy , oxide , chemical engineering , anode , dopant , lithium (medication) , composite number , graphene oxide paper , electrochemistry , scanning electron microscope , fourier transform infrared spectroscopy , nanotechnology , composite material , doping , electrode , polymer , polymerization , optoelectronics , chemistry , endocrinology , optics , metallurgy , medicine , physics , engineering
Abstract A polypyrrole/reduced graphene oxide (PPy/r‐GO) composite film is prepared by inducing electrochemical reduction of graphene oxide incorporated into PPy as the dopant. This film has a wrinkled surface morphology with a porous structure as revealed by scanning electron microscopy. Its porous structure is attributed to the physical nature of the GO sheets, providing a templating effect during PPy deposition. This PPy/r‐GO composite is characterized using in‐situ UV–visible spectroelectrochemistry as well as Raman and Fourier‐transform IR spectroscopy. The PPy/r‐GO material shows greatly improved electrochemical properties, i.e., a high rate capability and excellent cycling stability when used as a cathode material in a lithium ion battery. It also delivers a large reversible capacity when used as an anode material, and this is mainly attributed to the reduced graphene oxide (r‐GO) component.