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Titolo:
ROLE OF HYDRATION WATER IN THE REDUCTION PROCESS OF PBO2 IN LEAD ACIDCELLS/
Autore:
FITAS R; ZERROUAL L; CHELALI N; DJELLOULI B;
Indirizzi:
UNIV SETIF,LAB ENERGET & ELECTROCHIM SOLIDE SETIF 19000 ALGERIA UNIV SETIF,LAB ENERGET & ELECTROCHIM SOLIDE SETIF 19000 ALGERIA
Titolo Testata:
Journal of power sources
fascicolo: 1-2, volume: 64, anno: 1997,
pagine: 57 - 60
SICI:
0378-7753(1997)64:1-2<57:ROHWIT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEAD-ACID-BATTERY; HYDROGEN-LOSS CONCEPT; ELECTRODE; BETA-PBO2; DIOXIDES; FAILURE; MECHANISM; CAPACITY;
Keywords:
LEAD/ACID BATTERIES; HYDRATION WATER; LEAD DIOXIDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
R. Fitas et al., "ROLE OF HYDRATION WATER IN THE REDUCTION PROCESS OF PBO2 IN LEAD ACIDCELLS/", Journal of power sources, 64(1-2), 1997, pp. 57-60

Abstract

The influence of 'hydrogen loss' on the electrochemical properties ofboth alpha-PbO2 and beta-PbO2 was studied using galvanostatic discharge and cyclic voltammetry. The thermal decomposition of electroformed PbO2 shows two types of hydration water: the first type, which disappears at low temperature, is adsorbed on the surfaces of the PbO2 particles, and the second one is localized within the PbO2 crystal structure. The reduction process of PbO2 in lead/acid cells is mainly determined by diffusion processes within the oxide. The hydrogen diffusion coefficient (D) over tilde(H) in lead dioxide has been determined at 25 degrees C; the values obtained are between 0.42 and 1.67 X 10(-7) cm(2) s(-1). The removing of structurally bonded' water, by heating the samples at 230 degrees C, affects considerably the electrochemical properties of PbO2 and leads to a decrease in (D) over tilde(H).

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Documento generato il 25/11/20 alle ore 09:56:03