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An efficient and robust lanthanum strontium cobalt ferrite catalyst as a bifunctional oxygen electrode for reversible solid oxide cells

Title
An efficient and robust lanthanum strontium cobalt ferrite catalyst as a bifunctional oxygen electrode for reversible solid oxide cells
Author(s)
Kim, DoyeubPark, Jin WanChae, Munseok S.Jeong, IncheolPark, Jeong HwaKim, Kyeong JoonLee, Jong JunJung, ChanhoonLee, Chan-WooHong, Seung-TaeLee, Kang Taek
DGIST Authors
Kim, DoyeubPark, Jin WanChae, Munseok S.Jeong, IncheolPark, Jeong HwaKim, Kyeong JoonLee, Jong JunJung, ChanhoonLee, Chan-WooHong, Seung-TaeLee, Kang Taek
Issued Date
2021-03
Type
Article
Keywords
CatalystsCobaltDensity functional theoryElectric energy storageElectrodesElectrolytic reductionHydrogen storageIron compoundsLanthanumLanthanum compoundsOxygen reduction reactionPerovskiteSolid oxide fuel cells (SOFC)StrontiumStrontium compoundsWind powerBifunctional oxygen electrodesElectrical conductivity relaxation (ECR)Intermediate temperaturesLanthanum strontium cobalt ferriteOxygen evolution reaction (oer)Oxygen surface exchangeOxygen vacancy formation energiesReversible solid oxide cellsOxygen vacancies
ISSN
2050-7488
Abstract
Reversible solid oxide cells (SOCs) are unique devices that perform interconversion between chemical energy (particularly hydrogen) and electricity, providing efficient energy storage for site-specific and weather-dependent solar and wind resources. One of the key requirements for achieving high-performance reversible SOCs is the development of highly active bifunctional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, we investigate a La0.2Sr0.8Co0.8Fe0.2O3−δ(LSCF2882) material as a novel oxygen electrode for reversible SOCs at intermediate temperatures. Unlike most widely used La0.6Sr0.4Co0.2Fe0.8O3−δ(LSCF6428) with a rhombohedrally distorted perovskite structure, LSCF2882 possesses a simple cubic perovskite structure with a symmetric BO6octahedral network. Furthermore, the 3D bond valence sum calculation of the LSCF2882 structure suggests a reduction in oxygen ion conduction barrier energy. Oxygen surface exchange (kchem) and diffusion (Dchem) coefficients of LSCF2882 determined by electrical conductivity relaxation are consistently remarkably higher by >2 and 20 times compared to those of LSCF6428 at 700 °C, respectively. This result is further supported by a 43% reduction in the oxygen vacancy formation energy of LSCF2882 determined from density functional theory calculations. The reversible SOCs with LSCF2882 oxygen electrodes greatly outperform LSCF6428 cells in both fuel cell (2.55 W cm−2) and electrolysis mode (2.09 A cm−2at 1.3 V) at 800 °C, with excellent reversible cycling stability. Our findings strongly suggest that LSCF2882 is a promising candidate as a bifunctional oxygen electrode for high performance reversible SOCs at reduced temperatures. © The Royal Society of Chemistry 2021.
URI
http://hdl.handle.net/20.500.11750/15317
DOI
10.1039/d0ta11233j
Publisher
Royal Society of Chemistry
Related Researcher
  • 홍승태 Hong, Seung-Tae
  • Research Interests Magnesium; calcium; and zinc ion batteries; lithium all-solid-state batteries; Inorganic materials discovery; Solid state chemistry; Crystallography; Mg; Ca; Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Department of Energy Science and Engineering Battery Materials Discovery Laboratory 1. Journal Articles

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