Electrochemical Impedance Spectroscopy Investigation of the Anodic Functionalities and Processes in LSCM-CGO-Ni Systems | Zendy

Samir Boulfrad | Zendy; Aziz Nechache | Zendy; Mark Cassidy | Zendy; Enrico Traversa | Zendy; John T. S. Irvine | Zendy

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Electrochemical Impedance Spectroscopy Investigation of the Anodic Functionalities and Processes in LSCM-CGO-Ni Systems

Author(s) -

Samir Boulfrad,

Aziz Nechache,

Mark Cassidy,

Enrico Traversa,

John T. S. Irvine

Publication year - 2015

Publication title -

ecs transactions

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.235

H-Index - 52

eISSN - 1938-6737

pISSN - 1938-5862

DOI - 10.1149/06801.2011ecst

Subject(s) - dielectric spectroscopy , materials science , anode , electrical impedance , electrochemistry , analytical chemistry (journal) , conductivity , volumetric flow rate , electrode , conductor , catalysis , atmospheric temperature range , chemical engineering , chemistry , composite material , electrical engineering , chromatography , thermodynamics , biochemistry , physics , engineering

Electrochemical impedance spectroscopy was used to characterize anode compositions made of (La0.75Sr0.25)0.97Cr0.5Mn0.5O3 (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.

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