Enhanced electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3−δ cathode via Ba-doping for intermediate-temperature solid oxide fuel cells

Cai, Changkun; Xie, Manyi; Xue, Ke; Shi, Yu; Li, Shuting; Liu, Yuanyuan; An, Shengli; Yang, Hong

doi:10.1007/s12274-021-3972-0

Cited by 18 publications

(6 citation statements)

References 38 publications

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“…The d-spacing of (010), (100), and (1̅ 1̅ 0) is determined as 3.72, 3.72, and 2.57 Å, respectively, from the corresponding IFFT image. These values are smaller than the lattice parameters determined for LSCF before testing 32 and are also consistent with the XRD results. For the LSCF cathode after testing with Cr-exposure as seen in Figure 6b, its FFT pattern reveals a distorted cubic structure on the [22̅ 2̅ ] zone axis.…”

Section: Revealing Mechanismssupporting

confidence: 89%

“…Note that as reported in our recently published work, while the LSCF cathode consists of a single cubic perovskite phase ( Pm 3̅ m ; XRD PDF#89-5717), after Ba-doping to 0.2 molar fraction, the LBSCF0.2 cathode becomes a single rhombohedral phase ( R 3̅ c ; XRD PDF#49-0285). In between, LBSCF0.1 consists of a mixture of the cubic phase (40.7%) and rhombohedral phase (59.3%).…”

Section: Resultssupporting

confidence: 59%

“…Recently, we reported that Ba can be doped into LSCF up to 0.2 molar fraction, and at this doping level, it forms a pure rhombohedral perovskite phase (LSCF is a cubic perovskite phase), and Ba-doping in LSCF enhances the electrochemical performance of the LSCF cathode. 32 On top of this, we have carried out the density functional theory (DFT) calculation which confirms that the Ba-doped LSCF rhombohedral phase has a higher stability than the cubic LSCF phase. This motivates us to carry out this study focusing on the durability of Ba-doped LSCF under realistic SOFC operation conditions in the presence of the Cr-based alloy interconnector.…”

Section: Introductionmentioning

confidence: 80%

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Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode

Xie

Cai

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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As a device for direct conversion of chemical energy into electrical energy, the solid oxide fuel cell (SOFC) contributes positively to the sustainable development strategy. However, the commercialization of fuel cells is still impeded by severe cathode degradation caused by its limited stability at operating temperatures and being prone to Cr-poisoning from Cr-containing alloy interconnectors commonly used in these cells. This paper reports the development of a high-durability Ba-doped LSCF(La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ ) cathode material under realistic fuel cell operating conditions in the presence of the Cr alloy. In particular, when tested in a symmetrical cell constructed of Ba-doped LSCF, the polarization resistance of the cell remains very low at 0.06 Ω cm 2 after being tested at 800 °C for 120 h exposed to Cr in 3% humidified air. In contrast, for the undoped LSCF under the same testing conditions, the polarization resistance of the cell increases ∼10 times from 0.22 Ω cm 2 of the pristine cell to 2.18 Ω cm 2 after Cr-exposure testing. Furthermore, when tested in an anode-supported complete cell as a cathode under typical SOFC operation conditions at 750 °C, the cell with the Ba-doped LSCF cathode displays significantly low degradation rates of 0.00056% h −1 (without Cr) and 0.00310% h −1 (with Cr); both are much lower than that of the cell using the undoped LSCF cathode (0.00124% h −1 without Cr and 0.01082% h −1 with Cr). This enhanced durability and Cr-tolerance exhibited by the Ba-doped LSCF cathode stem from its higher crystal structure stability and improved chemical resistance compared to undoped LSCF.

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Section: Revealing Mechanismssupporting

confidence: 89%

Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 80%

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Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode

Xie

Cai

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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“…In light of the abovementioned requirements, the composite electrodes are generally more suitable for application as air electrodes of R-PCECs than single-phase electrodes. Several representative single-phase perovskite cathodes, such as La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF), [16,17] Ba 0.5 Sr 0.5 Co 0.8 Fe 0.3 O 3−δ (BSCF), [18] have been investigated as the air electrodes for R-PCECs. However, these air electrodes suffered a severe degradation occurred in EC mode when exposed to the high concentration of steam.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Self‐Assembled Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Electrochemical Cells

Liu

et al. 2022

Adv Funct Materials

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Reversible protonic ceramic electrochemical cells (R-PCECs) is one of the most promising devices for efficient energy conversion and storage due to the high flexibility in reversible operation on dual modes of fuel cell and electrolysis cells. The key limitations of R-PCECs performance lie mainly in the sluggish catalytic activity and poor durability of the air electrode for oxygen evolution/ reduction reactions under realistic operating conditions. Herein, the findings on the development of highly active and durable air electrodes, achieved by a catalytic self-assembly of Ba 2 Co 1.5 Mo 0.25 Nb 0.25 O 6−δ (BC1.5MN) composite electrode, are reported. Under high-temperature firing conditions, BC1.5MN is elegantly decomposed to a single-perovskite BaCoO 3−δ (SP-BCO) and a double-perovskite Ba 2−x Co 1.5−x Mo 0.5 Nb 0.5 O 6−δ (DP-BCMN). Furthermore, fuelelectrode-supported full cells with BC1.5MN air electrode exhibit outstanding performance at 650 °C, achieving a peak power density of 1.17 W cm −2 and an electrolysis current density of 2.04 A cm −2 at 1.3 V. More importantly, the cells demonstrate excellent operation durability over 1100 h in fuel cell mode and exceptional cell cycling stability over 110 times within 220 h in dual modes of fuel cell and electrolysis cell. It is experimentally suggested that the catalytic durability is optimized by strong interaction between BCO and BCMN.

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“…It was quickly abandoned due to the high cost and limited reserves, which would prevent the intended large-scale commercialization of SOFC technology [9][10][11] . The attention was quickly shifted to perovskite oxides (see Note below), such as La 1-x Sr x MnO 3 , when it was discovered to have excellent oxygen catalytic activity at 800-1,000 °C [12] . However, as a pure electronic conductor, the ORR could only occur at the interface of the cathode and electrolyte [13] .…”

Section: Introductionmentioning

confidence: 99%

Review on Fe-based double perovskite cathode materials for solid oxide fuel cells

Xie,

Cai,

Duan

et al. 2024

Energy Mater

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As a clean and efficient energy conversion device, solid oxide fuel cells have been garnering attention due to their environmentally friendly and fuel adaptability. Consequently, they have become one of the current research directions of new energy. The cathode, as the electrochemical reaction site of an oxidation atmosphere in solid oxide fuel cells, plays a key role in determining the output performance. In recent years, the development of double perovskite cathode materials with mixed ionic and electronic conductors has made significant progress in intermediate-temperature (600-800 °C) fuel cells. These materials have the potential to deliver higher power densities and improved stability, making them promising candidates for future fuel cell applications. The Fe-based double perovskite structure cathode material has gained extensive attention due to its adjustable crystal structure and performance, as it has A(A’) or B(B’) positions in its AA’BB’O6 structure. This material has several advantages, such as high oxygen catalytic activity, low thermal expansion coefficient, and compatibility with the thermal expansion of the electrolyte. An increasing number of researchers have been exploring the performance reaction mechanism of double perovskite by modifying and adjusting its material microstructure, crystal structure, and electronic structure. In this paper, the research progress of LnBaFe2O5 and Sr2Fe2-xMoxO6 double perovskite cathode materials is reviewed to highlight the effects of various modification methods developed on electrochemical performance of these materials. Furthermore, the potential future research directions of double perovskite cathode materials are prospected.

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Enhanced electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3−δ cathode via Ba-doping for intermediate-temperature solid oxide fuel cells

Cited by 18 publications

References 38 publications

Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode

Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode

Catalytic Self‐Assembled Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Electrochemical Cells

Review on Fe-based double perovskite cathode materials for solid oxide fuel cells

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Enhanced electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3−δ cathode via Ba-doping for intermediate-temperature solid oxide fuel cells

Cited by 18 publications

References 38 publications

Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La0.6Sr0.4Co0.2Fe0.8O3−δ Cathode

Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La0.6Sr0.4Co0.2Fe0.8O3−δ Cathode

Catalytic Self‐Assembled Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Electrochemical Cells

Review on Fe-based double perovskite cathode materials for solid oxide fuel cells

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Product

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Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode

Improved Durability of High-Performance Intermediate-Temperature Solid Oxide Fuel Cells with a Ba-Doped La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode