Electrochemical oscillations and bistability during anodic dissolution of vanadium electrode in acidic media—part I. ExperimentReport as inadecuate




Electrochemical oscillations and bistability during anodic dissolution of vanadium electrode in acidic media—part I. Experiment - Download this document for free, or read online. Document in PDF available to download.

Journal of Solid State Electrochemistry

, Volume 15, Issue 11–12, pp 2311–2320

First Online: 18 June 2011Received: 31 March 2011Revised: 21 May 2011Accepted: 07 June 2011

Abstract

Dynamic instabilities, current oscillations and bistability observed during anodic dissolution of both stationary and rotating disk vanadium electrode in acidic phosphoric media, were reported using both dc and ac techniques. The effect of various experimental conditions, concentration of H3PO4, temperature, disk rotation rate, and external resistance, was analyzed. Systematic studies allowed the construction of bifurcation diagrams, showing the regions of oscillations and bistability, including the complex behaviors like coexistence of both dynamic regimes. Analogous comparative measurements and analyses were performed for other media—sulfuric, nitric, perchloric, and trifluoroacetic acids—also indicating complex dynamic behaviors. These complexities arise not only due to the difficulties with the precise identification of the composition of the passive layer in every acid but are also due to relatively fast dissolution of V electrode, even in the presence of passive layer, which causes permanent drift of the system’s characteristics. Due to these experimental difficulties, theoretical modeling seems to be an appropriate method to analyze the essential nonlinear dynamic properties of the studied system.

KeywordsOscillations Bistability Vanadium electrodissolution Negative resistance Passivation  Download fulltext PDF



Author: Maciej T. Gorzkowski - Aleksandra Wesołowska - Rafał Jurczakowski - Paweł Ślepski - Kazimierz Darowicki - Marek Orlik

Source: https://link.springer.com/







Related documents