Publication

Combined Cr and S poisoning in solid oxide fuel cell cathodes

Jan Van Herle, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Josef Andreas Schuler, Zacharie Wuillemin, Caroline Calderone
2012
Journal Articles

Abstract

This work aims to compare the effect of combined chromium and sulfur contaminating conditions to the Cr contamination alone on the Cr poisoning mechanisms in (La,Sr)MnO3-(Zr,Y)O-2 solid oxide fuel cell (SOFC) cathodes. Whereas Cr2O3 and (Cr,Mn)(3)O-4 are found at active triple phase boundaries under the Cr-poisoning condition, the formation of SrCrO4 is promoted under combined Cr and S contaminating conditions, where Cr accumulations act as getters incorporating sulfur, to form Sr(Cr,S)O-4 compounds. The identification of this phase is validated on the synthesized and simulated species by scanning/transmission electron microscopy (SEM/TEM) techniques; its possible formation is predicted by thermodynamic analysis of the stability of perovskite compounds in the presence of combined Cr and S polluting conditions. In contrast, sulfur alone is not found to poison active sites in these composite cathodes. These findings suggest that the Cr poisoning degradation mechanism is altered when (La,Sr)MnO3 is exposed to Cr vapors in the presence of sulfur contamination; the access to electrochemical active sites may be hindered by the formation of Sr(Cr,S)O-4 in a similar manner to a Cr-getter effect in (La,Sr)(Co,Fe)O-3 cathodes. (C) 2011 Elsevier B.V. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/c7a8b811-1358-48eb-8d10-8f9945d80db5

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Jan Van Herle, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Josef Andreas Schuler, Zacharie Wuillemin, Caroline Calderone
2012
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c7a8b811-1358-48eb-8d10-8f9945d80db5

About this result

Related concepts (32)

Solid oxide fuel cell

A solid oxide fuel cell (or SOFC) is an electrochemical conversion device that produces electricity directly from oxidizing a fuel. Fuel cells are characterized by their electrolyte material; the SOFC has a solid oxide or ceramic electrolyte. Advantages of this class of fuel cells include high combined heat and power efficiency, long-term stability, fuel flexibility, low emissions, and relatively low cost. The largest disadvantage is the high operating temperature which results in longer start-up times and mechanical and chemical compatibility issues.

Solid oxide electrolyzer cell

A solid oxide electrolyzer cell (SOEC) is a solid oxide fuel cell that runs in regenerative mode to achieve the electrolysis of water (and/or carbon dioxide) by using a solid oxide, or ceramic, electrolyte to produce hydrogen gas (and/or carbon monoxide) and oxygen. The production of pure hydrogen is compelling because it is a clean fuel that can be stored, making it a potential alternative to batteries, methane, and other energy sources (see hydrogen economy).

Fuel cell

A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) into electricity through a pair of redox reactions. Fuel cells are different from most batteries in requiring a continuous source of fuel and oxygen (usually from air) to sustain the chemical reaction, whereas in a battery the chemical energy usually comes from substances that are already present in the battery. Fuel cells can produce electricity continuously for as long as fuel and oxygen are supplied.

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