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Li H, Wang W, Wang L, Wang M, Park KY, Lee T, Heyden A, Ding D, Chen F. Unlocking the Potential of A-Site Ca-Doped LaCo 0.2Fe 0.8O 3-δ: A Redox-Stable Cathode Material Enabling High Current Density in Direct CO 2 Electrolysis. ACS APPLIED MATERIALS & INTERFACES 2023; 15:43732-43744. [PMID: 37673786 DOI: 10.1021/acsami.3c08561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Massive carbon dioxide (CO2) emission from recent human industrialization has affected the global ecosystem and raised great concern for environmental sustainability. The solid oxide electrolysis cell (SOEC) is a promising energy conversion device capable of efficiently converting CO2 into valuable chemicals using renewable energy sources. However, Sr-containing cathode materials face the challenge of Sr carbonation during CO2 electrolysis, which greatly affects the energy conversion efficiency and long-term stability. Thus, A-site Ca-doped La1-xCaxCo0.2Fe0.8O3-δ (0.2 ≤ x ≤ 0.6) oxides are developed for direct CO2 conversion to carbon monoxide (CO) in an intermediate-temperature SOEC (IT-SOEC). With a polarization resistance as low as 0.18 Ω cm2 in pure CO2 atmosphere, a remarkable current density of 2.24 A cm-2 was achieved at 1.5 V with La0.6Ca0.4Co0.2Fe0.8O3-δ (LCCF64) as the cathode in La0.8Sr0.2Ga0.83Mg0.17O3-δ (LSGM) electrolyte (300 μm) supported electrolysis cells using La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) as the air electrode at 800 °C. Furthermore, symmetrical cells with LCCF64 as the electrodes also show promising electrolysis performance of 1.78 A cm-2 at 1.5 V at 800 °C. In addition, stable cell performance has been achieved on direct CO2 electrolysis at an applied constant current of 0.5 A cm-2 at 800 °C. The easily removable carbonate intermediate produced during direct CO2 electrolysis makes LCCF64 a promising regenerable cathode. The outstanding electrocatalytic performance of the LCCF64 cathode is ascribed to the highly active and stable metal/perovskite interfaces that resulted from the in situ exsolved Co/CoFe nanoparticles and the additional oxygen vacancies originated from the Ca2Fe2O5 phase synergistically providing active sites for CO2 adsorption and electrolysis. This study offers a novel approach to design catalysts with high performance for direct CO2 electrolysis.
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Affiliation(s)
- Haixia Li
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Wanhua Wang
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Lucun Wang
- Energy & Environmental Science and Technology, Idaho National Laboratory, Idaho Falls, Idaho 83401, United States
| | - Min Wang
- Energy & Environmental Science and Technology, Idaho National Laboratory, Idaho Falls, Idaho 83401, United States
| | - Ka-Young Park
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Taehee Lee
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Andreas Heyden
- Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29201, United States
| | - Dong Ding
- Energy & Environmental Science and Technology, Idaho National Laboratory, Idaho Falls, Idaho 83401, United States
| | - Fanglin Chen
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
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Zamudio-García J, Caizán-Juanarena L, Porras-Vázquez JM, Losilla ER, Marrero-López D. Unraveling the Influence of the Electrolyte on the Polarization Resistance of Nanostructured La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ Cathodes. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3936. [PMID: 36432222 PMCID: PMC9696385 DOI: 10.3390/nano12223936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/02/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Large variations in the polarization resistance of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathodes are reported in the literature, which are usually related to different preparation methods, sintering temperatures, and resulting microstructures. However, the influence of the electrolyte on the electrochemical activity and the rate-limiting steps of LSCF remains unclear. In this work, LSCF nanostructured electrodes with identical microstructure are prepared by spray-pyrolysis deposition onto different electrolytes: Zr0.84Y0.16O1.92 (YSZ), Ce0.9Gd0.1O1.95 (CGO), La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM), and Bi1.5Y0.5O3-δ (BYO). The ionic conductivity of the electrolyte has a great influence on the electrochemical performance of LSCF due to the improved oxide ion transport at the electrode/electrolyte interface, as well as the extended ionic conduction paths for the electrochemical reactions on the electrode surface. In this way, the polarization resistance of LSCF decreases as the ionic conductivity of the electrolyte increases in the following order: YSZ > LSGM > CGO > BYO, with values ranging from 0.21 Ω cm2 for YSZ to 0.058 Ω cm2 for BYO at 700 °C. In addition, we demonstrate by distribution of relaxation times and equivalent circuit models that the same rate-limiting steps for the ORR occur regardless of the electrolyte. Furthermore, the influence of the current collector material on the electrochemical performance of LSCF electrodes is also analyzed.
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Affiliation(s)
| | | | | | - Enrique R. Losilla
- Departamento de Química Inorgánica, Universidad de Málaga, 29071 Málaga, Spain
| | - David Marrero-López
- Departamento de Física Aplicada I, Universidad de Málaga, 29071 Málaga, Spain
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Pérez-Flores JC, Castro-García M, Crespo-Muñoz V, Valera-Jiménez JF, García-Alvarado F, Canales-Vázquez J. Analysis of Performance Losses and Degradation Mechanism in Porous La 2-X NiTiO 6-δ:YSZ Electrodes. MATERIALS 2021; 14:ma14112819. [PMID: 34070476 PMCID: PMC8197466 DOI: 10.3390/ma14112819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 05/20/2021] [Accepted: 05/21/2021] [Indexed: 11/16/2022]
Abstract
The electrode performance and degradation of 1:1 La2−xNiTiO6−δ:YSZ composites (x = 0, 0.2) has been investigated to evaluate their potential use as SOFC cathode materials by combining electrochemical impedance spectroscopy in symmetrical cell configuration under ambient air at 1173 K, XRD, electron microscopy and image processing studies. The polarisation resistance values increase notably, i.e., 0.035 and 0.058 Ωcm2 h−1 for x = 0 and 0.2 samples, respectively, after 300 h under these demanding conditions. Comparing the XRD patterns of the initial samples and after long-term exposure to high temperature, the perovskite structure is retained, although La2Zr2O7 and NiO appear as secondary phases accompanied by peak broadening, suggesting amorphization or reduction of the crystalline domains. SEM and TEM studies confirm the ex-solution of NiO with time in both phases and also prove these phases are prone to disorder. From these results, degradation in La2−xNiTiO6−δ:YSZ electrodes is due to the formation of La2Zr2O7 at the electrode–electrolyte interface and the ex-solution of NiO, which in turn results in the progressive structural amorphization of La18NiTiO6−δ phases. Both secondary phases constitute a non-conductive physical barrier that would hinder the ionic diffusion at the La2−xNiTiO6−δ:YSZ interface and oxygen access to surface active area.
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Affiliation(s)
- Juan Carlos Pérez-Flores
- 3D-ENERMAT, Renewable Energy Research Institute, ETSII-AB, University of Castilla-La Mancha, 02071 Albacete, Spain; (M.C.-G.); (V.C.-M.); (J.F.V.-J.)
- Correspondence: (J.C.P.-F.); (J.C.-V.)
| | - Miguel Castro-García
- 3D-ENERMAT, Renewable Energy Research Institute, ETSII-AB, University of Castilla-La Mancha, 02071 Albacete, Spain; (M.C.-G.); (V.C.-M.); (J.F.V.-J.)
| | - Vidal Crespo-Muñoz
- 3D-ENERMAT, Renewable Energy Research Institute, ETSII-AB, University of Castilla-La Mancha, 02071 Albacete, Spain; (M.C.-G.); (V.C.-M.); (J.F.V.-J.)
| | - José Fernando Valera-Jiménez
- 3D-ENERMAT, Renewable Energy Research Institute, ETSII-AB, University of Castilla-La Mancha, 02071 Albacete, Spain; (M.C.-G.); (V.C.-M.); (J.F.V.-J.)
| | - Flaviano García-Alvarado
- Chemistry and Biochemistry Dpto., Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Boadilla del Monte, 28668 Madrid, Spain;
| | - Jesús Canales-Vázquez
- 3D-ENERMAT, Renewable Energy Research Institute, ETSII-AB, University of Castilla-La Mancha, 02071 Albacete, Spain; (M.C.-G.); (V.C.-M.); (J.F.V.-J.)
- Correspondence: (J.C.P.-F.); (J.C.-V.)
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Harboe S, Sohn Y, Guillon O, Menzler N. Investigation of LSM-8YSZ cathode within an all ceramic SOFC. Part I: Chemical interactions. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2020.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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A Brief Description of High Temperature Solid Oxide Fuel Cell’s Operation, Materials, Design, Fabrication Technologies and Performance. APPLIED SCIENCES-BASEL 2016. [DOI: 10.3390/app6030075] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nie L, Liu Z, Liu M, Yang L, Zhang Y, Liu M. Enhanced Performance of La0.6Sr0.4Co0.2Fe0.8O3-\delta(LSCF) Cathodes with Graded Microstructure Fabricated by Tape Casting. J ELECTROCHEM SCI TE 2010. [DOI: 10.5229/jecst.2010.1.1.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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