نتایج جستجو برای: polypyrrole
تعداد نتایج: 2101 فیلتر نتایج به سال:
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The practical applications of high-capacitance polypyrrole (PPy) as an active material for electrochemical supercapacitors are mainly limited by their poor cycling stability. By utilizing nanoporous gold enhanced Raman scattering of PPy, we investigated ex situ and in situ the structural origins of the low electrochemical stability of PPy. This study provided direct evidence that the stability ...
Monomeric cobalt(II) tetraphenylporphyrin immobilized in high concentrations within vapour-phase polymerized polypyrrole deposited on an ITO electrode catalyzes the 4-electron reduction of dioxygen to water, a reaction requiring concerted action by two separate catalytic groups.
A facile preparation of polypyrrole-modified fullerene supported Pd nanoparticles catalyst is introduced; electrochemical measurements demonstrate that the obtained Pd/ppy-C(60) catalyst shows a good electrocatalytic activity and stability for the oxidation of formic acid.
Transition metal oxides as anode materials have received extensive research owing to the high specific capacity. However, rapid decline of battery capacity caused by volume expansion and low electrical conductivity hinders practical application transition oxides. This study reported a pseudo-capacitance material polypyrrole-coated Fe2O3/Mn2O3 composites stability for lithium-ion batteries. The ...
Restricted Hartree–Fock 6-31G calculations of electrical and mechanical anharmonicity contributions to the longitudinal vibrational second hyperpolarizability have been carried out for eight homologous series of conjugated oligomers—polyacetylene, polyyne, polydiacetylene, polybutatriene, polycumulene, polysilane, polymethineimine, and polypyrrole. To draw conclusions about the limiting infinit...
A nanocomposite comprising of polypyrrole and reduced graphene oxide was electrodeposited onto a carbon bundle fibre (CBF) through a two-step approach (CBF/PPy-rGO-2). The CBF/PPy-rGO-2 had a highly porous structure compared to a nanocomposite of polypyrrole and reduced graphene oxide that was electrodeposited onto a CBF in a one-step approach (CBF/PPy-rGO), as observed through a field emission...
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