Microstructure and electrical conductivity of La0.9Sr0.1 Ga0.8Mg0.2O2.85‐Ce0.8Gd0.2O1.9 composite electrolytes for <scp>SOFC</scp>s

Xu, Shun; Lin, Xin; Ge, Ben; Ai, Desheng; Ma, Jingtao; Peng, Zhijian

doi:10.1111/ijac.13048

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…The open circuit voltage (OCV) and current density only reached ~0.5 V and 0.32 A cm −2 , respectively. The maximum power output was ~0.16 W cm −2 at 800 °C , which is lower than the published data [23,31,32] for Ce0.9Gd0.1O1.95-1mol% MgO (0.47 W cm −2 at 700 °C ) [40], La0.9Sr0.1Ga0.8Mg0.2O2..85-Ce0.8Gd0.2O1.9 (60 W cm −2 at 700 °C ) [22], Ce0.8Sm0.15Ca0.05O1.875 (0.170 W cm −2 at 700 °C ) [34], and La0.85Sr0.15Ga0.8Mg0.2O2.825 (0.185 W cm −2 at 700 °C ) [41]. The fuel cell performance is relatively poor, which will limit the use of CSYG-BIT07 in SOFCs.…”

Section: Single Cell Performancecontrasting

confidence: 56%

Preparation and Properties of Ce0.8Sm0.16Y0.03Gd0.01O1.9-BaIn0.3Ti0.7O2.85 Composite Electrolyte

et al. 2022

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Samarium, gadolinium, and yttrium co-doped ceria (Ce0.8Sm0.16Y0.03Gd0.01O1.9, CSYG) and BaIn0.3Ti0.7O2.85 (BIT07) powders were prepared by sol-gel and solid-state reaction methods, respectively. CSYG-BIT07 composite materials were obtained by mechanically mixing the two powders in different ratios and calcining at 1300 °C for 5 h. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), as well as electrical properties and thermal expansion coefficient (TEC) measurements. A series of CSYG-BIT07 composite materials with relative densities higher than 95% were fabricated by sintering at 1300 °C for 5 h. The performance of the CSYG-BIT07 composite electrolyte was found to be related to the content of BIT07. The CSYG-15% BIT07 composite exhibited high oxide ion conductivity (σ800°C = 0.0126 S·cm−1 at 800 °C), moderate thermal expansion (TEC = 9.13 × 10−6/K between room temperature and 800 °C), and low electrical activation energy (Ea = 0.89 eV). These preliminary results indicate that the CSYG-BIT07 material is a promising electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs).

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Section: Single Cell Performancecontrasting

confidence: 56%

Preparation and Properties of Ce0.8Sm0.16Y0.03Gd0.01O1.9-BaIn0.3Ti0.7O2.85 Composite Electrolyte

et al. 2022

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“…Besides, an excessive sintering and poor densification yield in an excessive grain growth and the presence of pores, which are trapped among the grains or grain boundaries, blocking oxygen ion migration. Both contributions lead to a decrease in the conductivity of LSGM [37][38][39].…”

Section: Electrical Properties and Conductivity Measurementsmentioning

confidence: 99%

Development by Mechanochemistry of La0.8Sr0.2Ga0.8Mg0.2O2.8 Electrolyte for SOFCs

et al. 2020

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In this work, a mechanochemical process using high-energy milling conditions was employed to synthesize La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM) powders from the corresponding stoichiometric amounts of La 2 O 3 , SrO, Ga 2 O 3 , and MgO in a short time. After 60 min of milling, the desired final product was obtained without the need for any subsequent annealing treatment. A half solid oxide fuel cell (SOFC) was then developed using LSGM as an electrolyte and La 0.8 Sr 0.2 MnO 3 (LSM) as an electrode, both obtained by mechanochemistry. The characterization by X-ray diffraction of as-prepared powders showed that LSGM and LSM present a perovskite structure and pseudo-cubic symmetry. The thermal and chemical stability between the electrolyte (LSGM) and the electrode (LSM) were analyzed by dynamic X-ray diffraction as a function of temperature. The electrolyte (LSGM) is thermally stable up to 800 and from 900 • C, where the secondary phases of LaSrGa 3 O 7 and LaSrGaO 4 appear. The best sintering temperature for the electrolyte is 1400 • C, since at this temperature, LaSrGaO 4 disappears and the percentage of LaSrGa 3 O 7 is minimized . The electrolyte is chemically compatible with the electrode up to 800 • C. The powder sample of the electrolyte (LSGM) at 1400 • C observed by HRTEM indicates that the cubic symmetry Pm-3m is preserved. The SOFC was constructed using the brush-painting technique; the electrode-electrolyte interface characterized by SEM presented good adhesion at 800 • C. The electrical properties of the electrolyte and the half-cell were analyzed by complex impedance spectroscopy. It was found that LSGM is a good candidate to be used as an electrolyte in SOFC, with an Ea value of 0.9 eV, and the LSM sample is a good candidate to be used as cathode.

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“…Therefore, the strontium and magnesium-codoped lanthanum gallate-based electrolyte (LSGM) emerges as a promising intermediate-temperature electrolyte material . It is reported that the optimal composition of strontium and magnesium doping is concluded as the formula of La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3‑δ , which reveals excellent pure oxygen ion conductivity at intermediate temperature, good chemical stability, and high mechanical strength. − As there are few studies on LSGM electrolyte-based DC-SOFCs which directly use raw brown coal as fuel, it is meaningful to explore the feasibility of highly efficient utilization of real-world coal fuel for LSGM electrolyte-based cells. , …”

Section: Introductionmentioning

confidence: 99%

High-Performance La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ Electrolyte-Based Direct Raw Brown Coal Fuel Cells

Chen,

Wu,

Hao

et al. 2023

ACS Appl. Energy Mater.

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The direct carbon solid oxide fuel cell (DC-SOFC) is a potential energy conversion device that cleanly and effectively utilizes various carbon resources to generate electric power through electrochemical conversion. Recently, DC-SOFCs utilizing real-world coal fuel have gained great momentum due to the “dual carbon strategic goals”. Here, we report high-performance La0.9Sr0.1Ga0.8Mg0.2O3‑δ (LSGM) electrolyte-supported DC-SOFCs, by integrating Ag–Gd0.1Ce0.9O2−δ (GDC) as symmetrical electrodes, which enable highly efficient utilization of raw brown coal as fuel. As a comparison, the performances of the conventional yttria-stabilized zirconia (YSZ) electrolyte supported-DC-SOFCs are also investigated. Fueled by raw brown coal, the LSGM-based cells can deliver a maximum power density of 367 mW cm–2 at 850 °C, which is distinctly superior than that of the YSZ-based cells (249 mW cm–2). In addition, stability tests reveal that under a discharge current of 0.15 A, the cell can achieve a discharge time of 4.38 h and a better fuel utilization of 14.8%, indicating that a large current discharge is more propitious for the LSGM-based DC-SOFCs fueled by raw brown coal to achieve higher fuel utilization. This study exhibits the enormous potential of LSGM as an electrolyte material for high-performance direct brown coal fuel cells and provides direction guidance for the optimization of discharge operation of DC-SOFCs directly utilizing brown coal in consideration of fuel utilization.

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Microstructure and electrical conductivity of La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85‐Ce_0.8Gd_0.2O_1.9 composite electrolytes for SOFCs

Cited by 8 publications

References 35 publications

Preparation and Properties of Ce0.8Sm0.16Y0.03Gd0.01O1.9-BaIn0.3Ti0.7O2.85 Composite Electrolyte

Preparation and Properties of Ce0.8Sm0.16Y0.03Gd0.01O1.9-BaIn0.3Ti0.7O2.85 Composite Electrolyte

Development by Mechanochemistry of La0.8Sr0.2Ga0.8Mg0.2O2.8 Electrolyte for SOFCs

High-Performance La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ Electrolyte-Based Direct Raw Brown Coal Fuel Cells

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Microstructure and electrical conductivity of La0.9Sr0.1 Ga0.8Mg0.2O2.85‐Ce0.8Gd0.2O1.9 composite electrolytes for SOFCs

Cited by 8 publications

References 35 publications

Preparation and Properties of Ce0.8Sm0.16Y0.03Gd0.01O1.9-BaIn0.3Ti0.7O2.85 Composite Electrolyte

Preparation and Properties of Ce0.8Sm0.16Y0.03Gd0.01O1.9-BaIn0.3Ti0.7O2.85 Composite Electrolyte

Development by Mechanochemistry of La0.8Sr0.2Ga0.8Mg0.2O2.8 Electrolyte for SOFCs

High-Performance La0.9Sr0.1Ga0.8Mg0.2O3-δ Electrolyte-Based Direct Raw Brown Coal Fuel Cells

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Microstructure and electrical conductivity of La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85‐Ce_0.8Gd_0.2O_1.9 composite electrolytes for SOFCs

High-Performance La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ Electrolyte-Based Direct Raw Brown Coal Fuel Cells