Calculation of a pure double-layer capacitance from a constant phase element in the impedance measurements

Vladimir D. Jović

doi:10.5937/zasmat2201050J

Autori

Vladimir D. Jović University of Belgrade, Institute for Multidisciplinary Research, Serbia Autor

DOI:

https://doi.org/10.5937/zasmat2201050J

Ključne reči:

elektrohemijska impedansna spektroskopija, kapacitet dvojnog sloja, konstantni fazni element, rekacija izdvajanja vodonika

Apstrakt

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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