Electrochemical Impedance Spectroscopy Investigation of the Anodic Functionalities and Processes in LSCM-CGO-Ni Systems. (2nd June 2015)

• Record Type: Journal Article
• Authors: Boulfrad, Samir; Nechache, Aziz; Cassidy, Mark; Traversa, Enrico; Irvine, John T. S.
• Is Part Of: ECS transactions. Volume 68:Number 1(2015)
• Page Start: 2011
• Page End: 2018
• Publication Date: 2015-06-02
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06801.2011ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Electrochemical impedance spectroscopy was used to characterize anode compositions made of (La0.75 Sr0.25 )0.97 Cr0.5 Mn0.5 O3 (LSCM) and gadolinia doped ceria (CGO) with and without additional submicron Ni, or exsoluted Ni nanoparticles. In addition, the effects of the anode gas flow rate and the working temperature were investigated. Higher content of the ionic conductor leads to a decrease of the impedance in the frequency range from 100 Hz to 10 Hz. The effect of the catalyst component was investigated while keeping the electronic conductivity unchanged in the tested materials. Enhanced catalytic activity was demonstrated to considerably decrease the impedance especially in the frequency range between 100 Hz to 1 Hz. The change in the gas flow rate affects mainly the impedance bellow 1 Hz.