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

Jinping Wang, Yuzheng Lu, Naveed Mushtaq*, M. A.K. Yousaf Shah, Sajid Rauf, Peter Lund, Imran Asghar*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
79 Downloads (Pure)

Abstract

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.

Original languageEnglish
Pages (from-to)413-421
Number of pages9
JournalJournal of Rare Earths
Volume41
Issue number3
Early online date11 May 2022
DOIs
Publication statusPublished - Mar 2023
MoE publication typeA1 Journal article-refereed

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