Novel LaFe2O4 spinel structure with a large oxygen reduction response towards protonic ceramic fuel cell cathode

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Journal of Rare Earths, Volume 41, issue 3
Highly active and stable electrocatalysts are mandatory for developing high-performance and long-lasting fuel cells. The current study demonstrates a high oxygen reduction reaction (ORR) electrocatalytic activity of a novel spinel-structured LaFe 2O 4 via a self-doping strategy. The LaFe 2O 4 demonstrates excellent ORR activity in a protonic ceramic fuel cell (PCFC) at temperature range of 350–500 °C. The high ORR activity of LaFe 2O 4 is mainly attributed to the facile release of oxide and proton ions, and improved synergistic incorporation abilities associated with interplay of multivalent Fe 3+/Fe 2+ and La 3+ ions. Using LaFe 2O 4 as cathode over proton conducting BaZr 0.4Ce 0.4Y 0.2O 3 (BZCY) electrolyte, the fuel cell has delivered a high-power density of 806 mW/cm 2 operating at 500°C. Different spectroscopic and calculations methods such as UV–visible, Raman, X-ray photoelectron spectroscopy and density functional theory (DFT) calculations were performed to screen the potential application of LaFe 2O 4 as cathode. This study would help in developing functional cobalt-free ORR electrocatalysts for low temperature-PCFCs (LT-PCFCs) and solid oxide fuel cells (SOFCs) applications.
Projects are financially supported by the National Natural Science Foundation of China (51772080, 11604088) and Jiangsu Provence Talent Program (JSSCRC2021491). Dr. Asghar thanks the Hubei Talent 100 program and Academy of Finland (13329016, 13322738) for their support. Authors also thank PhD student Jingjing Yang for correcting and formatting of the manuscript and references.
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Wang , J , Lu , Y , Mushtaq , N , Yousaf Shah , M A K , Rauf , S , Lund , P & Asghar , I 2023 , ' Novel LaFe 2 O 4 spinel structure with a large oxygen reduction response towards protonic ceramic fuel cell cathode ' , Journal of Rare Earths , vol. 41 , no. 3 , pp. 413-421 .