Abstract
Solid oxide fuel cells (SOFCs) have appeared as a promising technology for a wide variety of potential commercial applications to lessen the urgency of energy shortage and environmental pollution associated with using conventional fossil fuels. Among the worldwide SOFCs research activities, the progress of SOFCs fed with hydrocarbon fuels that contain trace amount of H2S is one of the most important research directions. Thereby, it becomes crucial to design novel electrode materials with enhanced catalytic activity, stability and tolerances to carbon deposition and sulfur poisoning. La-substituted SrTiO3 (LST) based perovskite anodes have been widely investigated because of their high electronic conductivity in reducing atmospheres, excellent dimensional and chemical stability upon redox cycling and outstanding sulfur and coking tolerances. In this review paper, we will describe the development of LST-based anode materials for SOFCs in recent years. The synthesis, structure and fuel cell performance of the doped LST and LST-based composite anode materials are summarized in detail. The mechanism of H2S-induced enhancement effect for electrochemical reactions on the LST-based anode materials is explored. The challenges related to the future developments of LST-based anode materials for SOFCs are also discussed.
Highlights
Conventional fossil fuels are the main energy sources at present and for the foreseeable future
Solid oxide fuel cells (SOFCs) have appeared as a promising technology for a wide variety of potential commercial applications to lessen the urgency of energy shortage and environmental pollution associated with using conventional fossil fuels
We will describe the development of Lasubstituted SrTiO3 (LST)-based anode materials for SOFCs in recent years
Summary
One of the major concerns associated with utilizing hydrocarbon fuels in SOFCs is the anode catalyst coking and sulfur poisoning since H2S exists in most raw feedstock. The commonly employed Ni-based anode catalyst can be deactivated by carbon deposits and suffers irreversible sulfur poisoning. Intensive efforts have been devoted to developing novel anode catalysts. The development of a variety of LST-based anode materials will be reviewed in details. The LST-based anode fabrication process, the relationship between microstructure and the fuel cell performance, and miscellaneous issues regarding to LST-based materials will be discussed. A complete and comprehensive coverage of all the research activities on the LST-based anode materials may not be an easy task, this short review paper is meant to be a summary of most of the correlative research in recent years
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