Low-temperature crystallization of LaFeO3 perovskite with inherent catalytically surface for the enhanced oxygen evolution reaction

This study reports a facile and economic method for LaFeO3 perovskite crystallization process at low temperature range from 300oC to 500oC and an outstanding oxygen evolution reaction (OER) catalyst based on inherent catalytically surface. As a key material for low temperature synthesis, cyanogel-pe...

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Bibliographic Details
Published in:Nano energy 2023-01, Vol.105, p.108003, Article 108003
Main Authors: Kim, Hee Jun, Kim, Sang Heon, Kim, Sun-Woo, Kim, Jin-Kyeom, Cao, Chentian, Kim, Yongchul, Kim, Ungsoo, Lee, Geunsik, Choi, Jae-Young, Oh, Hyung-Suk, Song, Hyun-Cheol, Choi, Won Jun, Park, Hyesung, Baik, Jeong Min
Format: Article
Language:English
Subjects:
cyanometallate coordination polymer
inherent catalytically surface
low temperature synthesis
oxygen evolution reaction
perovskite oxides
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Summary:This study reports a facile and economic method for LaFeO3 perovskite crystallization process at low temperature range from 300oC to 500oC and an outstanding oxygen evolution reaction (OER) catalyst based on inherent catalytically surface. As a key material for low temperature synthesis, cyanogel-peroxo-complex as a metastable molecular precursor was synthesized via ligand exchange using potassium cyanide solution to provide superoxo (O2–) ligand to Fe-CN-La gel structure, leading to a high degree of crystallinity with ideal ABO3 stoichiometry at low temperatures (400 ~ 500oC). Electrocatalysts based on LaFeO3 nanoparticles were fabricated, showing an outstanding OER performance with low overpotential of ~ 438mV at 100mA/cm2 and small Tafel slope of 61mV·dec–1 under alkaline conditions, better than commercialized available IrOx/C catalysts. Its OER performance is attributed to the inherent oxygen-deficient layer at the surface created at low temperature (300oC). Long-term stability test shows no significant change (< 1%) in the potential during 50h, indicating a high stability of such catalysts. [Display omitted] •LaFeO3 crystallization process at low temperature (< 500oC) is studied•LaFeO3 with exact stoichiometric ratio was achieved by using KCN•The cyanogel-peroxo-complex formation for suppling O2− leads good crystallinity•At 300oC, the crystalline LaFeO3 is synthesized with an inherent amorphous layer•Outstanding OER performance at 100mA/cm2 and long-term (50-h) stability is demonstrated
ISSN:2211-2855
DOI:10.1016/j.nanoen.2022.108003