Nanoscale and nano-structured electrodes of solid oxide fuel cells by infiltration: Advances and challenges

In the context of solid oxide fuel cells (SOFCs) applications, mixed-ionic electronic conductors offer significant advantages over conventional cathodes especially in the intermediate-to-low range of temperatures where the performance of the cathode is of fundamental importance. An increasing number of layered oxide materials have been found to present excellent properties as mixed ionic-electronic conductors. Therefore, considerable efforts have been recently devoted to better understand and evaluate layered ordered structures. This article highlights the most important advances in this topic concentrating on both structural aspects and impact in cathode performance for SOFCs applications.

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Perovskite oxides applications in high temperature oxygen separation, solid oxide fuel cell and membrane reactor: A review

Solid oxide fuel cells (SOFCs) are complex electrochemical devices that offer significant advantages over conventional power generation technologies. Many of these advantages surround the environmental impact of energy generation and in particular the efficiency of power production coupled with the potential range of fuel sources that can be foreseen. Despite these advantages there remain a number of challenges that may delay the full commercialisation of the solid oxide fuel cell. Several of these surround the materials selection, function and interactions with other cell components. It is the intention of this article to highlight the contribution that materials chemistry has made to the development of SOFCs and the future progress that is dependent on advances in materials chemistry.

Solid oxide fuel cells - a challenge for materials chemists?

Synthesis, electrical and electrochemical properties of Ba0.5Sr0.5Zn0.2Fe0.8O3−δ perovskite oxide for IT-SOFC cathode

A newly developed cathode material, Ba0.5Sr0.5Co0.8Fe0.2O3-delta, was synthesized and characterized. X-ray diffraction results identified it as a cubic perovskite structure. Thermogravimetric results showed that lattice oxygen loss was about 2% in weight between 50 and 1000 degrees C. Thermal expansion coefficient results in air and argon were extraordinarily high, with slope changes occurring at about 382 and 360 degrees C, respectively. Electrical conductivity values were sufficient for cathode application with the maximum of about 28.1 S cm(-1) at 500 degrees C in air and 17.3 S cm(-1) at 900 degrees C in N-2, correspondingly. Both thermal and electrical properties were closely associated with lattice oxygen behaviors and oxygen partial pressure. (c) 2005 The Electrochemical Society.

Yuqiang Liu

Papers

Thermal and Electrical Properties of New Cathode Material Ba0.5Sr0.5Co0.8Fe0.2O3 − δ for Solid Oxide Fuel Cells