Electrochemical Properties of La0.6A0.4Co0.2Fe0.8O3 (A = Sr, Ca, Ba) as a Bifunctional Electrode for Reversible Solid Oxide Cells

Ping, Li; Liu, Fei; Xu, Meiling; Han, Yinuo; Yan, Fei; Gan, Tian; Fu, Dong

doi:10.1021/acs.energyfuels.3c00346

Cited by 6 publications

(3 citation statements)

References 43 publications

(76 reference statements)

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“…Furthermore, during 20 cycles of mode-switching cyclic testing between fuel cell and electrolysis modes, RSOC fuel electrode materials exhibited exceptional stability. On the other hand, Li et al [60] conducted a synthesis of oxides, specifically La 0.6 A 0.4 Co 0.2 Fe 0.8 O 3 , with A representing strontium (Sr), calcium (Ca), and barium (Ba), intended for deployment as dual-function electrodes in RSOC applications. Notably, the experimental outcomes underscored La 0.6 Ca 0.4 Co 0.2 Fe 0.8 O 3 (LCCF) as the superior performer in terms of redox capabilities.…”

Section: Fuel Electrodementioning

confidence: 99%

Recent Development in Reversible Solid Oxide Fuel Cells: Theory, Integration and Prospective

Yang,

Lei,

Huang

et al. 2023

ChemElectroChem

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Reversible solid oxide fuel cell (RSOC) has gained widespread attention due to their potential for high efficiency in implementing multi‐energy distributed systems. When high power demand is required, RSOC can operate in the solid oxide fuel cell (SOFC) mode, directly converting the chemical energy from hydrogen or other renewable fuels into electricity. When excess electricity is available, RSOC can operate in the solid oxide electrolysis cell (SOEC) mode, producing fuels through the electrolysis of water or co‐electrolysis of water and carbon dioxide. The reversible operation of RSOC enables the direct conversion between chemical energy and electricity, offering a promising solution for clean and sustainable energy with low cost and high round‐trip efficiency. This paper introduces the research background and working principles of RSOC, provides a detailed overview of the current research status of electrolyte, fuel electrode, and oxygen electrode materials, discusses the optimization design of RSOC stacks and energy utilization strategies in the system. In addition, the future development directions of RSOC were also explored, which is of significant importance for the commercialization of RSOC.

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Section: Fuel Electrodementioning

confidence: 99%

Recent Development in Reversible Solid Oxide Fuel Cells: Theory, Integration and Prospective

Yang,

Lei,

Huang

et al. 2023

ChemElectroChem

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“…PEMFCs mainly realize the process of converting chemical energy to electrical energy via the hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR), and its operating temperature is within the range of room temperature to 100 °C. It is characterized by a high energy conversion efficiency, high power density, pollution-free reaction process, and good low-temperature starting performance.…”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Carbon-Supported Platinum-Based Catalysts for Proton Exchange Membrane Fuel Cells

Yang

et al. 2023

Energy Fuels

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The proton exchange membrane fuel cell (PEMFC) is a fast growing nextgeneration energy conversion technology, which has broad application prospects in electric vehicles, such as portable power supplies, fixed power supplies, and the military industry. The development of PEMFCs has attracted much attention due to their high energy conversion efficiency, good low-temperature startup performance, no pollution, no noise, and other advantages. However, the cathodic oxygen reduction reaction (ORR) kinetics in fuel cells is slow. It is therefore necessary that we use a large number of carbon-supported platinum (Pt)based catalysts in order to speed up the reaction. As a result, the current problems of high cost and low durability of carbon-supported Pt-based catalysts have become a major reason for limiting the successful commercialization of fuel cells. To meet the requirements of high catalytic activity and high stability of carbon-supported Pt-based catalysts, this review summarizes the research progress and methods for optimizing the performance of carbonsupported Pt-based catalysts for PEMFCs. In addition, this review highlights the current progress in improving the performance of carbon-supported Pt-based catalysts in terms of the reduction of particle size, exposure of highly active crystal surfaces, control of Pt particle morphology, and preparation of Pt−M alloys as well as some support characteristics and preparation technologies. Furthermore, the development of carbon-supported Pt-based catalysts in the direction of fuel cells and the main challenges they will face in practical applications are also proposed in this review. In summary, the carbonsupported Pt-based catalysts optimized using the above methods show great potential in the ORR. With continuous improvement of preparation and characterization technologies, carbon-supported Pt-based catalysts have broad applications and market prospects.

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“…Semiconductor materials play a vital role in the reactions taking place at both electrodes and therefore have specific structural and activity requirements. , In general, electrode materials must have excellent catalytic oxidation and reduction activity, as well as good stability under high temperature and high humidity conditions. Among these materials, the perovskite La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3‑δ (LSCF) oxide has gained wide recognition and usage due to its acceptable hydrogen oxidation/oxygen reduction activity and good tolerance against moisture atmosphere. , Recently, various strategies have been explored to enhance the catalytic activity of electrode materials for both conventional and single-component SOCs. − For example, introducing A-site defects in (La 0.6 Sr 0.3 )CrO 3‑δ hydrogen electrode material has been shown to significantly enhance the concentration of oxygen vacancies, thus improving catalytic activity . Similarly, the substitution of O 2– with alternative anions such as F – and Cl – has also been identified as an effective approach.…”

Section: Introductionmentioning

confidence: 99%

Improving Electrochemical Oxidation/Reduction Kinetics in Single-Component Solid Oxide Cells through Synergistic A-Site Defects and Anion Doping

Li,

Chen,

Zhang

et al. 2023

Energy Fuels

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Solid oxide fuel/electrolysis cells (SOFCs/SOECs) have emerged as promising technologies for reversibly converting chemical and electrical energy. Here, we propose a synergistic approach involving the introduction of A-site defects and anion doping in the perovskite La0.6Sr0.4Co0.2Fe0.8O3‑δ (LSCF) oxide to enhance its electrochemical oxidation/reduction kinetics as an electrode material in single-component SOFCs/SOECs. By creating an A-site deficient and F-doped oxyfluoride, designated as (La0.6Sr0.4)0.95Co0.2Fe0.8F0.1O2.9‑δ (F-(LS)0.95CF), we effectively lower the valence state of both Co and Fe elements, leading to a higher concentration of oxygen vacancies. This synergistic approach yields a remarkable approximately 5-fold increase in the oxygen surface exchange coefficient (k chem) and a 50% increase in the bulk diffusion coefficient (D chem) at 700 °C, when compared with LSCF. The resulting F-(LS)0.95CF-based single cell demonstrates approximately a 100% higher maximum power density for SOFC operation and a 60% higher current density at 1.3 V for SOEC operation. These improvements are further supported by lower polarization resistances observed in symmetrical cells with F-(LS)0.95CF. Furthermore, detailed investigations into the reaction kinetics reveal distinctive behaviors for the hydrogen oxidation reaction when comparing LSCF to F-(LS)0.95CF as the electrode material. Specifically, for LSCF, the rate-limiting step is the adsorption and dissociation of H2, while for F-(LS)0.95CF, it primarily involves a charge-transfer reaction. Conversely, for the oxygen reduction reaction, regardless of the electrode material being LSCF or F-(LS)0.95CF, the rate-limiting step consistently involves the reduction of oxygen atoms to O–.

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Electrochemical Properties of La_0.6A_0.4Co_0.2Fe_0.8O₃ (A = Sr, Ca, Ba) as a Bifunctional Electrode for Reversible Solid Oxide Cells

Cited by 6 publications

References 43 publications

Recent Development in Reversible Solid Oxide Fuel Cells: Theory, Integration and Prospective

Recent Development in Reversible Solid Oxide Fuel Cells: Theory, Integration and Prospective

Review and Perspectives of Carbon-Supported Platinum-Based Catalysts for Proton Exchange Membrane Fuel Cells

Improving Electrochemical Oxidation/Reduction Kinetics in Single-Component Solid Oxide Cells through Synergistic A-Site Defects and Anion Doping

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