Abstract
Detailed chemical information from electrode surfaces at operating conditions is essential for rational development of solid oxide cell (SOC) electrodes but so far, because of harsh operating conditions very little is known about mechanistic aspects of surface reactions as well as surface thermodynamics at SOC electrodes under electrochemical reaction conditions (1,2). Spectroelectrochemistry, i.e. spectroscopic (X-ray absorption, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy) characterization of operating electrode at electrochemically controlled conditions is promising approaches for characterization of surface properties like oxidation states, surface polarization, surface coverage with adsorbate, etc. at real or almost real working conditions.This study present results of operando high temperature (HT)-NAP-XPS spectroelectrochemical measurements of pulsed lased deposited thin film Ni-Ce0.9Gd0.1O2-δ electrode using novel dual-chamber spectroelectrochemical cell at H2, at different cell polarizations at 650 °C. Change on redox state of surface Ni and Ce atoms has been observed as a function of hydrogen concentration.
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