Improving the performance of the Ba0.5Sr0.5Co0.8Fe0.2O3- cathode for proton-conducting SOFCs by microwave sintering

Liu, Wenyun; Kou, Hongning; Wang, Xianfen; Bi, Lei; Zhao, Xiuge

doi:10.1016/j.ceramint.2019.06.281

Cited by 48 publications

(21 citation statements)

References 67 publications

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“…It should be noted that the current cell employs a single-phase SFMSc cathode without coupling the electrolyte material in the cathode. Even in this scenario, the performance is superior to that of several H-SOFCs with composite cathodes [41,[56][57][58][59]. In the case of conventional H-SOFC cathodes, proton-conducting electrolyte materials are usually mixed with the cathode material to form the cathode composite, thereby extending the active reaction area to the two-phase connections [25].…”

Section: Resultsmentioning

confidence: 99%

“…The SFM/SFMSc was deposited on the surface of the BCZY membrane before co-sintering the cathode layer with the half-cell at 850°C for 10 min in a microwave sintering furnace, resulting in complete cells. It is reported that the microwave sintering approach may adhere the cathode layer to the electrolyte at lower temperatures than the traditional sintering method, which mitigates potential interfacial reactions and preserves the cathode's ideal microstructure [41]. It should be emphasized that the cathode is only SFM or SFMSc without any electrolyte powder coupling.…”

Section: Methodsmentioning

confidence: 99%

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Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Zhang

Yin

et al. 2022

Sci. China Mater.

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Sc-doped Sr 2 Fe 1.5 Mo 0.5 O 6−δ (SFMSc) was successfully synthesized by partially substituting Mo in Sr 2 Fe 1.5 -Mo 0.5 O 6−δ (SFM) with Sc, resulting in a higher proton diffusion rate in the resultant SFMSc sample. Theoretical calculations showed that doping Sc into SFM lowered the oxygen vacancy formation energy, reduced the energy barrier for proton migration in the oxide, and increased the catalytic activity for oxygen reduction reaction. Next, a proton-conducting solid oxide fuel cell (H-SOFC) with a single-phase SFMSc cathode demonstrated significantly higher cell performance than that of cell based on an Sc-free SFM cathode, achieving 1258 mW cm −2 at 700°C. The performance also outperformed that of many other H-SOFCs based on single-phase cobalt-free cathodes. Furthermore, no trade-off between fuel cell performance and material stability was observed. The SFMSc material demonstrated good stability in both the CO 2 -containing atmosphere and the fuel cell application. The combination of high performance and outstanding stability suggests that SFMSc is an excellent cathode material for H-SOFCs.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Zhang

Yin

et al. 2022

Sci. China Mater.

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“…Table 4 summarizes the power output and polarization of P‐SOFCs using different cobalt‐based perovskite cathodes in literature reports and this study [15–21] . One can see that the performance of the cell in this study using KSCN−BCZY cathode is promising compared with previous reports.…”

Section: Resultsmentioning

confidence: 62%

Theoretical and Experimental Investigations on K‐doped SrCo_0.9Nb_0.1O_3‐δ as a Promising Cathode for Proton‐Conducting Solid Oxide Fuel Cells

et al. 2021

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Improving proton conduction in cathodes is regarded as one of the most effective methods to accelerate the sluggish proton‐involved oxygen reduction reaction (P‐ORR) for proton‐conducting solid oxide fuel cells (P‐SOFCs). In this work, K+ dopant was used to improve the proton uptake and migration ability of SrCo0.9Nb0.1O3‐δ (SCN). K+‐doped SCN (KSCN) demonstrated great potential to be a promising cathode for P‐SOFCs. Density functional theory calculations suggested that doping with K+ led to more oxygen vacancies and more negative values of hydration enthalpy, which was helpful for the improvement of proton concentration. Importantly, the proton migration barriers could be depressed, benefiting proton conduction. Electrochemical investigations signified that the cell using KSCN cathode had a peak power density of 967 mW cm−2 at 700 °C, about 54.1 % higher than that using a SCN cathode. This research highlights the K+‐doping strategy to improve electrochemical performance of cathodes for P‐SOFCs.

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“…Microwave energy is mainly different from conventional heating because it penetrates deeply into the volume and offers non-contact fast heating that can be applied to many different processes. Microwave heating technology has become a valuable technique for quickly preparing high-performance new materials and modifying conventional materials, based on the special energy transfer and conversion mechanism, as well as rapid heating and selective heating characteristics [3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Use of Microwave Energy on The Reduction of Iron Ore and Steelmaking Mill Scale Composite Self-Reducing Mixtures

et al. 2022

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With the growing industrialization, there is a constant increase in the world demand for steel, causing an increase on extraction of low-grade iron ores, which bear high levels of impurities. A feasible alternative is the use of residues from steel rolling processes (steelmaking mill scale) generated in the steel industry, which are composed of iron oxides consisting mainly of wustite (FeO), hematite (Fe 2 O 3 ) and magnetite (Fe 3 O 4 ). In line with the recycling of wastes, the application of heating by microwave energy in ironmaking processes consists in a promising new method developed in recent decades and is considered a cleaner technique. Therefore, this study aims to evaluate the self-reduction of mixtures composed of iron ore and steelmaking mill scale as iron source, together with coke fines as carbon source, heated using microwave energy. Through the rotational central composite design technique, it was possible to evaluate the best conditions for the use of steelmaking scale residue as well as the effect of the applied microwave energy power. The results indicated that the developed process has relevant utility with up to 41.48% of reduction obtained. The outcomes contribute to a better understanding of iron recovery from steelmaking residues in reduction processes using microwave energy for heating, providing significant insight for the development of new clean technologies.

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Improving the performance of the Ba0.5Sr0.5Co0.8Fe0.2O3- cathode for proton-conducting SOFCs by microwave sintering

Cited by 48 publications

References 67 publications

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Theoretical and Experimental Investigations on K‐doped SrCo_0.9Nb_0.1O_3‐δ as a Promising Cathode for Proton‐Conducting Solid Oxide Fuel Cells

Evaluation of the Use of Microwave Energy on The Reduction of Iron Ore and Steelmaking Mill Scale Composite Self-Reducing Mixtures

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Improving the performance of the Ba0.5Sr0.5Co0.8Fe0.2O3- cathode for proton-conducting SOFCs by microwave sintering

Cited by 48 publications

References 67 publications

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Theoretical and Experimental Investigations on K‐doped SrCo0.9Nb0.1O3‐δ as a Promising Cathode for Proton‐Conducting Solid Oxide Fuel Cells

Evaluation of the Use of Microwave Energy on The Reduction of Iron Ore and Steelmaking Mill Scale Composite Self-Reducing Mixtures

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Theoretical and Experimental Investigations on K‐doped SrCo_0.9Nb_0.1O_3‐δ as a Promising Cathode for Proton‐Conducting Solid Oxide Fuel Cells