Semiconductor-Ionic Nanocomposite La0.1Sr0.9MnO3−δ-Ce0.8Sm0.2O2−δ Functional Layer for High Performance Low Temperature SOFC

Wang, Zhaoqing; Wang, Xunying; Xu, Zheng; Deng, Hui; Dong, Wenjing; Wang, Baoyuan; Feng, Cheng; Liu, Xueqi; Wang, Hao

doi:10.3390/ma11091549

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…To increase the electrochemical activity of LSM air electrodes, their compositions with ionic conductors were applied, e.g., with solid electrolytes (YSZ [205,303,352,[372][373][374][375][376][377][378][379][380][381][382][383], YSZ with GDC10 [374], SSZ [149,[384][385][386][387][388][389][390], GDC10 [391], GDC [152,198], SDC [148,149,387,392,393], doped Bi 2 O 3 [151,[394][395][396][397][398][399], BaZr 0.85 Y 0.15 O 3 − δ (BZY15) [154], LWO56 [156], LSGM [400,401]), or MIEC materials (Co- [150,402] and Fe-based perovskites [403][404][405]). The optimu...…”

Section: Enhancement Of the Ionic-conducting Electrode Componentmentioning

confidence: 99%

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Филонова

Pikalova

2023

Materials

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The progressive research trends in the development of low-cost, commercially competitive solid oxide fuel cells with reduced operating temperatures are closely linked to the search for new functional materials as well as technologies to improve the properties of established materials traditionally used in high-temperature devices. Significant efforts are being made to improve air electrodes, which significantly contribute to the degradation of cell performance due to low oxygen reduction reaction kinetics at reduced temperatures. The present review summarizes the basic information on the methods to improve the electrochemical performance of conventional air electrodes with perovskite structure, such as lanthanum strontium manganite (LSM) and lanthanum strontium cobaltite ferrite (LSCF), to make them suitable for application in second generation electrochemical cells operating at medium and low temperatures. In addition, the information presented in this review may serve as a background for further implementation of developed electrode modification technologies involving novel, recently investigated electrode materials.

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Section: Enhancement Of the Ionic-conducting Electrode Componentmentioning

confidence: 99%

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Филонова

Pikalova

2023

Materials

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“…Several composite cathodes containing LSM were examined so far [14,. The second phase was reported: (i) the electrolyte material of pure ionic conductivity such as yttria-stabilized zirconia (YSZ) [16][17][18][19][20][21], scandia-stabilized zirconia [22], gadolinia-doped ceria (GDC) [18,23] samaria-doped ceria (SDC) [24], bismuth oxide conductors [25][26][27], and lanthanum tungstate [28]; (ii) the noble metal of high catalytic activity such as silver [29][30][31] and platinum [28]; (iii) material of mixed ionic electronic conductivity such as LSCF [14,32], La 0.6 Sr 0.4 FeO 3−δ , (LSF) [31], La 2 Ni 0.5 Co 0.5 O 4 , and LaNi 0.5 Co 0.5 O 3 [33]; others such as BaO [34], CeO 2 [31], CoO x [35], Co 3 O 4 [36,37], and FeO x [38].…”

Section: Introductionmentioning

confidence: 99%

“…Strandbakke et al [28] reported that composite cathodes LSM with lanthanum tungstate and platinum reveal polarization resistance 40 Ω cm 2 at 650 • C. Rehman et al [18] described the properties of ternary composite LSM-YSZ-GDC, reporting maximum power densities of 215, 316, and 396 mW cm −2 at 750, 800, and 850 • C, respectively. Wang et al [24] applied LSM-SDC composite cathode in low-temperature SOFC. The authors reported that the optimum ratio of LSM:SDC is 1:2.…”

Section: Introductionmentioning

confidence: 99%

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

et al. 2022

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The high efficiency of solid oxide fuel cells with La0.8Sr0.2MnO3−δ (LSM) cathodes working in the range of 800–1000 °C, rapidly decreases below 800 °C. The goal of this study is to improve the properties of LSM cathodes working in the range of 500–800 °C by the addition of YFe0.5Co0.5O3 (YFC). Monophasic YFC is synthesized and sintered at 950 °C. Composite cathodes are prepared on Ce0.8Sm0.2O1.9 electrolyte disks using pastes containing YFC and LSM powders mixed in 0:1, 1:19, and 1:1 weight ratios denoted LSM, LSM1, and LSM1, respectively. X-ray diffraction patterns of tested composites reveal the presence of pure perovskite phases in samples sintered at 950 °C and the presence of Sr4Fe4O11, YMnO3, and La0.775Sr0.225MnO3.047 phases in samples sintered at 1100 °C. Electrochemical impedance spectroscopy reveals that polarization resistance increases from LSM1, by LSM, to LSM2. Differences in polarization resistance increase with decreasing operating temperatures because activation energy rises in the same order and equals to 1.33, 1.34, and 1.58 eV for LSM1, LSM, and LSM2, respectively. The lower polarization resistance of LSM1 electrodes is caused by the lower resistance associated with the charge transfer process.

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“…These exceptional conductivity values are achieved through the creation of vacancies in their framework. However, there are many examples of SOFC with alternative electrolytes working successfully below 800 °C [8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Dual Oxygen Defects in Layered La1.2Sr0.8−xBaxInO4+δ (x = 0.2, 0.3) Oxide-Ion Conductors: A Neutron Diffraction Study

et al. 2019

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The title compounds exhibit a K2NiF4-type layered perovskite structure; they are based on the La1.2Sr0.8InO4+δ oxide, which was found to exhibit excellent features as fast oxide-ion conductor via an interstitial oxygen mechanism. These new Ba-containing materials were designed to present a more open framework to enhance oxygen conduction. The citrate-nitrate soft-chemistry technique was used to synthesize such structural perovskite-type materials, followed by annealing in air at moderate temperatures (1150 °C). The subtleties of their crystal structures were investigated from neutron powder diffraction (NPD) data. They crystallize in the orthorhombic Pbca space group. Interstitial O3 oxygen atoms were identified by difference Fourier maps in the NaCl layer of the K2NiF4 structure. At variance with the parent compound, conspicuous oxygen vacancies were found at the O2-type oxygen atoms for x = 0.2, corresponding to the axial positions of the InO6 octahedra. The short O2–O3 distances and the absence of steric impediments suggest a dual oxygen-interstitial mechanism for oxide-ion conduction in these materials. Conductivity measurements show that the activation energy values are comparable to those typical of ionic conductors working by simple vacancy mechanisms (~1 eV). The increment of the total conductivity for x = 0.2 can be due to the mixed mechanism driving both oxygen vacancies and interstitials, which is original for these potential electrolytes for solid-oxide fuel cells.

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Semiconductor-Ionic Nanocomposite La0.1Sr0.9MnO3−δ-Ce0.8Sm0.2O2−δ Functional Layer for High Performance Low Temperature SOFC

Cited by 8 publications

References 38 publications

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

Dual Oxygen Defects in Layered La1.2Sr0.8−xBaxInO4+δ (x = 0.2, 0.3) Oxide-Ion Conductors: A Neutron Diffraction Study

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