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2022, vol. 63, br. 1, str. 50-57
Izračunavanje prave vrednosti kapaciteta dvojnog sloja iz konstantnog faznog elementa u impedansnim merenjima
Univerzitet u Beogradu, Centar za multidisciplinarne studije

e-adresavladajovic@imsi.bg.ac.rs
Ključne reči: elektrohemijska impedansna spektroskopija; kapacitet dvojnog sloja; konstantni fazni element; rekacija izdvajanja vodonika
Sažetak
Razmatrajući literature o elektrohemijskoj impedansnoj spektroskopiji (EIS) ustanovljeno je da za izračunavanje vrednosti kapaciteta dvojnog sloja (Cdl) iz konstantnog faznog elementa (CPE) postoje dve jednačine, jedna u kojoj figuriše otpor elektrolita (Rs) i druga u kojoj ovaj parametar ne figuriše. Izračunavanjem vrednosti Cdl za definisane parametre (Ydl, , Rs , Rct), u ovom radu je pokazano da se dobijaju drugačiji rezultati za Cdl primenom ovih jednačina. Takođe je konstatovano da je neprihvatljivo da oba parametra (Rct i Rs) na isti način zavise od vremenske konstante, odn. od parametra . Ispitivanjem reakcije izdvajanja vodonika na Ni mrežici u rastvoru 1 M KOH na 25 oC korišćenjem impedansnih merenja, pokazano je da su zavisnosti Cdl vs. E, dobijene korišćenjem pomenutih jednačina, različite. Da bi se izbegao ovaj problem predloženo je da se koristi jednačina u kojoj ne figuriše otpor elektrolita (Rs), jer uvodjenje Rs nema korektan fizički smisao.
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O članku

jezik rada: engleski
vrsta rada: naučni članak
DOI: 10.5937/zasmat2201050J
primljen: 14.10.2021.
prihvaćen: 05.11.2021.
objavljen u SCIndeksu: 10.03.2022.
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