A redox-reversible A/B-site co-doped BaFeO3 electrode for direct hydrocarbon solid oxide fuel cells

Li, Haixia; Wang, Wanhua; Zhao, Kai; Park, Ka-Young; Lee, Taehee; Dizaj, Ramin Babazadeh; Heyden, Andreas; Ding, Dong; Chen, Fanglin

doi:10.1039/d4ta01957a

A redox-reversible A/B-site co-doped BaFeO₃ electrode for direct hydrocarbon solid oxide fuel cells

Journal Article · Fri May 03 00:00:00 EDT 2024 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/d4ta01957a· OSTI ID:2396906

Li, Haixia ^[1]; Wang, Wanhua ^[1]; Zhao, Kai ^[2]; ^[2]; ^[2]; Dizaj, Ramin Babazadeh ^[2]; ^[2]; ^[3]; ^[2]

Univ. of South Carolina, Columbia, SC (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Univ. of South Carolina, Columbia, SC (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Solid oxide fuel cells (SOFCs) can directly convert the chemical energy in fuel to electrical energy with fuel flexibility; however, the conventional nickel-based anodes face great challenges due to coking upon direct oxidation of hydrocarbon fuels and redox instability. Thus, developing new anode materials which can provide high coking resistance as well as redox stability is crucial. In this work, Ba_0.6La_0.4Fe_0.8Mo_0.1Ni_0.1O_3-δ (BLFMN) has been synthesized in air using a sol–gel combustion method, resulting in a dual phase consisting of a cubic BLFMN main phase and scheelite BaMoO₄ (BMO₄) secondary phase. By heat-treating the BLFMN dual phase in H₂ at 800 °C for 5 h, a metallic nanoparticle-decorated BLFMN triple phase compound comprising cubic BLFMN, cubic BaMoO₃ (BMO₃) and in situ exsolved FeNi₃ alloy was obtained. BLFMN was subsequently investigated as an electrode material for La_0.8Sr_0.2Ga_0.83Mg_0.17O_3-δ (LSGM) electrolyte (300 μm) supported SOFCs. Symmetrical cells using BLFMN as electrodes with the cell configuration of BLFMN//LSGM//BLFMN showed excellent redox reversibility and a peak power density (PPD) of 1.32 W cm^-2 at 850 °C when using H₂ as fuel. Single cell with the cell configuration of BLFMN//LSGM//LSCF (La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ) reached PPD of 1.61 and 0.41 W cm^-2 at 850 °C when operating with H₂ and CH₄ fuel, respectively. Moreover, the single cell exhibit excellent stability (over 300 h) upon direct oxidation of hydrocarbon fuels of CH₄ and C₃H₈. This study indicates that BLFMN is a promising redox reversible and coking resistant anode for SOFCs.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC07-05ID14517

Other Award/Contract Number:: DMR-1832809

OSTI ID:: 2396906

Alternate ID(s):: OSTI ID: 2429255

Report Number(s):: INL/JOU--24-79514-Rev000

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 23 Vol. 12; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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08 HYDROGEN
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Solid oxide fuel cells
alloy nanoparticles
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coking resistance
redox stability