Premium
Electrochemical codeposited polypyrrole–tungsten oxide composite materials with wide potential windows
Author(s) -
Bai Minghua,
Li Yidi,
Liu Rui,
Yu Zhan,
Wang Ying,
Zhao Zhen
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.202000004
Subject(s) - polypyrrole , cyclic voltammetry , saturated calomel electrode , chemistry , electrode , electrochemistry , horizontal scan rate , composite number , electrolyte , chemical engineering , composite material , nanotechnology , materials science , working electrode , engineering
The three‐dimensional morphology has sufficient interface contact and can be in favor of the electronic transport process. In this work, the demand for high‐performance electrodes such as energy storage devices has been designed. Polypyrrole and tungsten oxide composite materials (PPy‐WO 3 ) have been synthesized by cyclic voltammetry (CV) technology at −0.6 to 0.9 V versus saturated calomel electrode (SCE) for 20 cycles. The PPy‐WO 3 20 mV/s , PPy‐WO 3 60 mV/s , and PPy‐WO 3 120 mV/s electrodes have been prepared by CV technology at sweep rates of 20, 60, and 120 mV/s. The influences of scan rate on morphologies and charge storage properties of the composites are discussed. Among them a three‐dimensional flake structure for PPy‐WO 3 20 mV/s with a size of up to several micrometers was synthesized. PPy‐WO 3 20 mV/s composites as electrode materials exhibit a wide charge storage potential window of 1.4 V (between −0.9 and 0.5 V vs. SCE) and a specific capacitance of 145.13 F/g at 1 mA/cm 2 . Moreover, the long‐term stability of PPy‐WO 3 20 mV/s and PPy has been investigated in 5 M LiCl aqueous electrolyte. The stability of the materials can be improved by inorganic and organic composites.