Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Chemistry

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Electrochemical Synthesis, Doping and Possibilities of Application of Polyacetylene

Koval’chuk E. P., Kovalyshyn Ya. S., Klenina O. V., Jóźwiak L., Rak J., Błażejowski J.

Polish Journal of Chemistry

2000

Vol. 74, nr 9

1299-1299

An improved method of electrochemical synthesis and doping of polyacetylene coating aluminium or graphite electrodes is described. The polymerization is initiated by electrochemically generated Ni2+ ions, which efficiently interact with acetylene molecules in the solution. As calculations at the DFT level have shown, polymerization of acetylene most probably begins during the passage of Ni2+ ions through the solution and is completed after their reduction at the cathode. The influence of electrolyte concentration, current density and time on the mass of the polymer and metal ion content in it, as well as the yield and efficiency of polymerization, was thoroughly investigated. Polyacetylene doped primarily by ions in the solution was electrochemically re-doped and used for the construction of secondary lithium batteries. Doped and re-doped polyacetylene exhibits quite high electrical conductivity which, as semi-empirical calculations at the AM1 level have indicated, most probably arises from the presence of ions. These batteries are good for about twenty charge-discharge cycles, during which their electrical characteristics gradually deteriorate. The batteries most probably age, because the polyacetylene oxidizes by atmospheric oxygen.

The chemical properties of Zn and Ag composite electrodes for power sources

Koval'chuk E.P., Artymyshyn O.R., Reshetnyak O.V., Pankevych R.V.

Polish Journal of Chemistry

1998

Vol. 72, nr 6

1089-1095

Chemical properties of composite electrodes for the silver-zinc (Ag-Zn) battery have been studied. The instability of the supersaturated zincate electrolyte solutions is related to the formation of polynuclear zincate complex. In accordance with quantum-mechanical calculation it was shown that most stable is the complex with the linear structure. The influence of polycrylamide, both on the stability of the electrolyte solutions and in the inhibition of dendrite formation, has been studied.