Intrinsic Electrocatalytic Activity Regulation of R-P Perovskite La1.2Sr0.8Ni0.6Fe0.4O4+δ by Low-Temperature Fluorination - Details

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Ruddlesden-Popper　(R-P)　perovskite　oxides　have　attracted　much　attention　as　highly　active　and　stable　bifunctional　materials　for　the　oxygen　evolution　reaction　(OER)/oxygen　reduction　reaction　(ORR)　in　alkaline　solutions　due　to　the　nonuse　of　precious　metal　elements.　Herein,　a　triple　(H+,　O2-,　and　electron)　conductive　R-P　perovskite　oxide,　La1.2Sr0.8Ni0.6Fe0.4O4+δ,　was　prepared,　and　the　valence　state　of　transition　metal　cations　and　highly　oxidized　oxygen　(O-/O22-)　in　the　structure　was　tuned　by　a　low-temperature　fluorine　substitution　treatment.　The　homogeneous　distribution　of　the　fluorine　elements　across　the　particles　of　the　R-P　perovskite　oxide　after　its　fluorination　was　confirmed　by　high-resolution　transmission　electron　microscopy　(HRTEM)　images.　By　regulation　of　the　amount　of　highly　oxidative　state　oxygen　species　and　the　valence　state　of　transition　metal　cations　in　the　R-P　perovskite　structure,　the　material　exhibits　a　significant　enhancement　for　both　the　OER　and　ORR　electrocatalytic　activities.　The　fluoridated　La1.2Sr0.8Ni0.6Fe0.4O4+δFy　(LSNF-OF)　achieves　a　low　OER　overpotential　of　308.1　mV　in　a　1　M　KOH　electrolyte　at　a　current　density　of　10　mA　cm-2.　This　is　superior　to　both　commercial　Co3O4　and　the　pristine　sample　without　fluorination.　The　LSNF-OF　electrode　in　an　aqueous　Zn-air　battery　(ZAB)　exhibits　a　peak　power　density　of　19.15　W　g-1　at　a　current　density　of　24　mA　g-1.　The　low-temperature　trace　fluorination　can　enhance　the　electrocatalytic　efficiency　of　perovskite　oxides.　This　technique　can　be　applied　to　various　types　of　metal　oxides.　©　2024　American　Chemical　Society.

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[ 1 ] [Cao X.]College of Chemical Engineering, Fuzhou University, Fujian, Fuzhou, 350116, China
[ 2 ] [Cao X.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 3 ] [Cao X.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 4 ] [Hao Y.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 5 ] [Hao Y.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 6 ] [Zheng J.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 7 ] [Zheng J.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 8 ] [Wang H.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 9 ] [Wang H.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 10 ] [Lin Z.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 11 ] [Lin Z.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 12 ] [Zhao Y.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 13 ] [Zhao Y.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 14 ] [Liu J.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 15 ] [Liu J.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 16 ] [Zhang M.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 17 ] [Zhang M.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 18 ] [Shen Z.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 19 ] [Shen Z.]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China

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Energy and Fuels

ISSN： 0887-0624

Year： 2024

Issue： 9

Volume： 38

Page： 8095-8102

5 . 2 0 0

JCR@2023

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ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 4

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