Designing highly active core/shell cathode materials for low-temperature PCFCs

Lu, Yuzheng; Shah, M.A.K. Yousaf; Almutairi, Badriah S.; Mushtaq, Naveed; Yousaf, Muhammad; Akbar, Nabeela; Arshad, Naila; Shamim, Tariq; Dong, Yiwang

doi:10.1016/j.jallcom.2023.170861

Cited by 4 publications

(2 citation statements)

References 54 publications

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“…A distinct peak at approximately 700 cm −1 was observed in the BCFZY material, which can be attributed to an asymmetric structure with some imperfections. 40 The major peak observed at around 600 cm −1 in the BCO sample corresponds to the breathing mode, which is a significant Raman feature. 41 In comparison, the characteristic peaks of both BCFZY and BCO can be observed at approximately 600 and 700 cm −1 , respectively, in the BCFZY-BCO composite material, confirming that both phases maintain their distinct characteristics without any unexpected phase formation.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…The Raman spectra of BCFZY, BCO, and BCFZY-BCO material are depicted in Figure c. A distinct peak at approximately 700 cm –1 was observed in the BCFZY material, which can be attributed to an asymmetric structure with some imperfections . The major peak observed at around 600 cm –1 in the BCO sample corresponds to the breathing mode, which is a significant Raman feature .…”

Section: Resultsmentioning

confidence: 97%

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Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO_3-δ with Triple Conductor BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ for Proton-Conducting Solid Oxide Fuel Cells

Wang,

Cui,

Zhu

et al. 2024

J. Phys. Chem. C

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Proton conduction fuel cells (PCFCs) are emerging as a promising technology for the conversion of chemical and waste heat energy into electrical energy. However, its commercial application is often hindered by the low activity of the oxygen reduction reaction at low temperatures. In this study, a composite material consisting of BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3−δ (BCFZY) and BaCoO 3−δ (BCO) was synthesized to achieve a synergistic combination of proton/oxygen ion/electron triple conduction with oxygen ion/electron double conduction at a specific ratio. The utilization of the composite material led to an enhancement in conductivity and remarkable improvement in both bulk diffusion coefficient (D chem ) and the surface exchange coefficient (k chem ) across all temperature ranges, effectively amplifying oxygen reaction kinetics. Furthermore, the BCFZY-BCO electrode demonstrated a remarkable enhancement in peak power density, increasing from 820 mW cm −2 to an impressive 1161 mW cm −2 at 650 °C. The integration of BCFZY and BCO presents an effective strategy for PCFCs, significantly improving overall cell performance and oxygen reaction kinetics through the synergistic effects of the composite materials.

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Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 97%

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO_3-δ with Triple Conductor BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ for Proton-Conducting Solid Oxide Fuel Cells

Wang,

Cui,

Zhu

et al. 2024

J. Phys. Chem. C

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Superior Durability and Activity of a Benchmark Triple‐Conducting Cathode by Tuning Thermo‐Mechanical Compatibility for Protonic Ceramic Fuel Cells

Yu,

Ge,

et al. 2024

Adv Funct Materials

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As a benchmark triple‐conducting cathode, BaCo0.4Fe0.4Zr0.1Y0.1O3−δ (BCFZY) has been widely investigated for protonic ceramic fuel cells (PCFC) in recent years. However, the reported electrochemical performance of BCFZY cathode differs, which is determined in this work to originate from the thermal expansion mismatch between BCFZY and electrolyte. Accordingly, two strategies for enhanced thermo‐mechanical compatibility are examined: impregnation and thermal expansion offset. In contrast to the impregnation of BCFZY nanoparticles on electrolyte backbones that only helps improve electrochemical performance, negative thermal expansion oxide Sm0.85Cu0.15MnO3−δ (SCM)‐offset BCFZY exhibits superior durability and activity simultaneously. Specifically, the polarization resistance decay rate of the SCM‐offset BCFZY is only ~0.2%/100 h, compared with ~18.75%/100 h for “impregnated BCFZY.” Moreover, pure SCM generates moderate cathodic performance (area‐specific resistance = 0.11 Ω cm2, 700 °C), X‐ray diffraction and transmission electron microscopy reveal an in‐situ formed intergranular Ba2Cu3SmO7−δ phase at the boundaries of BCFZY and SCM. Thus, SCM can serve as a “three‐effect” additive, i) offset thermo‐expansion, ii) strengthen electrode structure and adhesion, and iii) provide acceptable oxygen‐reduction‐reaction activity, being favorable for superior performance. A PCFC using a SCM‐offset BCFZY cathode achieves the highest power density (1455 mW cm−2) yet recorded for PCFCs with BCFZY‐based cathodes.

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Recent progress in oxygen electrodes for protonic ceramic electrochemical cells

Oh,

Kim,

Jeong

et al. 2024

J. Korean Ceram. Soc.

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Protonic ceramic electrochemical cells, a promising technology for energy conversion and storage, have garnered significant interest in recent years owing to their superior low-temperature (< 600 °C) performance relative to solid oxide electrochemical cells. However, the sluggish kinetics of oxygen electrodes have impeded further advancements. Despite considerable research efforts, the development of practically applicable oxygen electrodes remains challenging. We herein review the recent research focusing on the fundamental understanding and development of oxygen electrode materials. Furthermore, we provide a range of material design strategies for enhancing the catalytic activity of oxygen electrodes along with a concise overview of potential derivative applications. Finally, the perspectives and potential directions for the development of oxygen electrodes for high-performance protonic ceramic electrochemical cells are presented.

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Designing highly active core/shell cathode materials for low-temperature PCFCs

Cited by 4 publications

References 54 publications

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO_3-δ with Triple Conductor BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ for Proton-Conducting Solid Oxide Fuel Cells

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO_3-δ with Triple Conductor BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ for Proton-Conducting Solid Oxide Fuel Cells

Superior Durability and Activity of a Benchmark Triple‐Conducting Cathode by Tuning Thermo‐Mechanical Compatibility for Protonic Ceramic Fuel Cells

Recent progress in oxygen electrodes for protonic ceramic electrochemical cells

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Designing highly active core/shell cathode materials for low-temperature PCFCs

Cited by 4 publications

References 54 publications

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO3-δ with Triple Conductor BaCo0.4Fe0.4Zr0.1Y0.1O3−δ for Proton-Conducting Solid Oxide Fuel Cells

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO3-δ with Triple Conductor BaCo0.4Fe0.4Zr0.1Y0.1O3−δ for Proton-Conducting Solid Oxide Fuel Cells

Superior Durability and Activity of a Benchmark Triple‐Conducting Cathode by Tuning Thermo‐Mechanical Compatibility for Protonic Ceramic Fuel Cells

Recent progress in oxygen electrodes for protonic ceramic electrochemical cells

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Product

Resources

About

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO_3-δ with Triple Conductor BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ for Proton-Conducting Solid Oxide Fuel Cells

Enhancing the Oxygen Reaction Kinetics through Compositing BaCoO_3-δ with Triple Conductor BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ for Proton-Conducting Solid Oxide Fuel Cells