Exploring the potential of triple conducting perovskite cathodes for high-performance solid oxide fuel cells: a comprehensive review

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Abstract

We report many factors that affect the uptake and conduction of ions of triple conducting perovskites (TCPs) and the current research progress of TCPs by dividing TCPs into three categories.

Abstract

Solid oxide fuel cells (SOFCs) represent a class of energy conversion devices that exhibit exceptional efficiency in the direct conversion of chemical energy from diverse fuel sources into electricity. The cathode, which is responsible for the oxygen reduction reaction (ORR) and electron transfer in the cell, plays a critical role in determining the overall performance of SOFCs. In recent years, triple conducting perovskite (TCP) materials have attracted increasing attention as cathode materials for SOFCs due to their excellent electrocatalytic activity, high electronic and ionic conductivity, and thermal stability at high temperatures. This review paper provides a comprehensive overview of the TCP cathode materials used in SOFCs. In this paper, we first introduce the basic principles and working mechanism of SOFCs. Then, we discuss the current research status of the TCP cathodes, including their compositions, structures, and performance characteristics. Moreover, we highlight the recent advances in the development of new cathode materials and strategies to enhance the overall performance of SOFCs. Finally, we provide insights into the future research directions and potential applications of TCP cathodes in SOFCs. This review aims to offer a comprehensive understanding of the TCP cathodes and facilitate the development of more efficient and cost-effective SOFCs.

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Proton-Conducting Oxides

K.D. Kreuer (2003)

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Readily processed protonic ceramic fuel cells with high performance at low temperatures

Ali Almansoori, Ryan O'Hayre, Chuancheng Duan … (2015)

Because of the generally lower activation energy associated with proton conduction in oxides compared to oxygen ion conduction, protonic ceramic fuel cells (PCFCs) should be able to operate at lower temperatures than solid oxide fuel cells (250° to 550°C versus ≥600°C) on hydrogen and hydrocarbon fuels if fabrication challenges and suitable cathodes can be developed. We fabricated the complete sandwich structure of PCFCs directly from raw precursor oxides with only one moderate-temperature processing step through the use of sintering agents such as copper oxide. We also developed a proton-, oxygen-ion-, and electron-hole-conducting PCFC-compatible cathode material, BaCo(0.4)Fe(0.4)Zr(0.1)Y(0.1)O(3-δ) (BCFZY0.1), that greatly improved oxygen reduction reaction kinetics at intermediate to low temperatures. We demonstrated high performance from five different types of PCFC button cells without degradation after 1400 hours. Power densities as high as 455 milliwatts per square centimeter at 500°C on H2 and 142 milliwatts per square centimeter on CH4 were achieved, and operation was possible even at 350°C.