Publication date: 10th April 2024
Solid oxide fuel cell (SOFC) is all-solid-state energy conversion device that converts directly chemical energy stored in fuel into electricity. Significant efforts have been devoted to developing high-performance electrode materials with the aim of increasing the power density of SOFC stacks. Besides electrochemical activity, the structural stability of electrode material is equally important for practical long-term operation of SOFCs. Compared to single perovskite, B-site perovskites have low thermal expansion coefficient and high structure stability. However, they usually show unsatisfied electrochemical activity as SOFC electrode materials. In this work, we modulate the electrode reaction kinetics by constructing anti-site defects in the B-site double perovskite lattice through the design of element occupation, which promote the formation of electronic and oxide ionic conduction network, and so facilitate the charge transport through the electrode. On the other hand, we constructed heterogenous coherent interface in B-site and simple perovskite composite cathode to accelerate the charge transport through the formation of interface tensile stress. The inherent interface limits the chemical expansion and element segregation, enhancing the structure stability. These two works demonstrate the great potentials of B-site perovskite in high performance electrodes for SOFCs.
The authors wants to thank the finacial supports from National Key R&D Program of China (2018YFB1502202), National Natural Science Foundation of China (52074023) and Beijing Natural Science Foundation (2222062).
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