Co and Hf co-doped BaFeO3 cathode with obviously enhanced catalytic activity and CO2 tolerance for solid oxide fuel cell

Pei, Yongli; Wang, Haocong; Gong, Jian; Yan, Zixiang; Xu, Lanlan; Liu, Xiaojuan; Gao, Xiao-Chen; Meng, Fanzhi; Meng, Jian

doi:10.1016/j.ijhydene.2022.08.283

Cited by 10 publications

(2 citation statements)

References 40 publications

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“…Oxygen reduction reaction involves many elementary steps, and most of them are related to the electronic and ionic conductivity of the cathode. , As a result, perovskite oxides (ABO 3 ) with mixed ionic-electronic conductivity and structural flexibility have attracted considerable attention to be developed as the potential ILT-SOFC cathode, such as SrFeO 3−δ and SrCoO 3−δ based perovskite. − However, they tend to form an ordered oxygen vacancy structure, which requires a long and ordered distance for oxygen vacancy transport. It is detrimental to oxygen ionic conduction, resulting in high polarization loss. , There are disordered oxygen vacancies in the A/B site doping methods, such as La x Sr 1– x Co 1– y Fe y O 3 (LSCF), Ba x Sr 1– x Co 1– y Fe y O 3 (BSCF), and Sr(Fe/Co) 1– x M x O 3 (M = Nb 5+ , Mo 6+ , Ti 4+ , and Sc 3+ ).…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Nanocomposite Based on SrCo_0.7Fe_0.2Sc_0.1O_3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Wang,

Zhu,

et al. 2024

ACS Appl. Mater. Interfaces

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The high performance of intermediate-to-low temperature solid oxide fuel cells (ILT-SOFCs) closely depends on the catalytic activity of the cathode material. However, most high-activity perovskite cathodes are rich in Sr and will arise from Sr segregation during the long-term working, resulting in the decay of activity and stability. Herein, by regulating the calcined way and temperature, a type of self-assembled nanocomposite perovskite cathode is developed, the stoichiometric SrCo 0.7 Fe 0.2 Sc 0.1 O 3−δ (SCFSc) powder self-separates into a cubic phase (Pm3̅ m, Sc-rich) and a tetragonal phase (P4/mmm, Sc-fewer). Meanwhile, a single cubic phase is prepared with the same formula via calcining the SCFSc pellet. It is found that the nanocomposite cathode shows better oxygen reduction reaction catalytic activity than single cubic SCFSc, caused by lower impedance of oxygen surface exchange and bulk diffusion. Particularly, the nanocomposite SCFSc cathode with the self-assembled heterointerfaces mitigates the Sr segregation and shows a peak power density of 1.17 W cm −2 at 700 °C and excellent stability for ∼101 h at 600 °C. This work provides a strategy for the development of nanocomposite cathodes to mitigate cation segregation and improve catalytic activity and stability.

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Section: Introductionmentioning

confidence: 99%

Self-Assembled Nanocomposite Based on SrCo_0.7Fe_0.2Sc_0.1O_3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Wang,

Zhu,

et al. 2024

ACS Appl. Mater. Interfaces

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“…Often, the materials with predominantly electronic conductivity are used as electrodes for PCFCs, in which case the ORR is limited by a region of triple phase boundary [9,10]. From this point of view, alternative candidates with a mixed ion-electron conduction (MIEC) are more promising due to extended area of the ORR-active sites, leading to a considerable improvement of the electrodes' electrochemical activity [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Chemical stability aspects of BaCe_0.7–xFe_xZr_0.2Y_0.1O_3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Tarutina,

Starostina,

Vdovin

et al. 2023

Chim.Tech.Acta

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Mixed ion-electron conductors (MIECs) are promising materials for air electrodes for protonic ceramic fuel cells (PCFCs) or oxygen permeation membranes. In this work, various aspects of the chemical stability of Co-free MIEC materials, BaCe0.7–xFexZr0.2Y0.1O3–δ, were studied, including their interaction with another functional material (BaCe0.5Zr0.3Y0.1Yb0.1O3–δ-based proton-conducting electrolyte) and gas components (H2O, CO2, and H2). Chemical compatibility studies indicate no visible chemical interaction between the electrode and electrolyte materials even at 1200 °C, which is significantly higher than the operating temperatures (600–800 °C) of PCFCs. The treatments of BaCe0.7–xFexZr0.2Y0.1O3–δ in different atmospheres at 1100 °C, according to the XRD, SEM, IR and Raman spectroscopy data, resulted in the formation of impurity phases. However, their extremely small amounts suggest that they may not form at the operating temperatures. Thus, it can be assumed that the studied materials can be good candidates for various electrochemical applications.

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Effect of octahedral occupancy of bimetal-doping and CO2-induced surface reconstruction on oxygen reduction reaction of cobalt-based perovskite oxides

Wang,

Zhu,

Gong

et al. 2024

Chemical Engineering Journal

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Co and Hf co-doped BaFeO3 cathode with obviously enhanced catalytic activity and CO2 tolerance for solid oxide fuel cell

Cited by 10 publications

References 40 publications

Self-Assembled Nanocomposite Based on SrCo_0.7Fe_0.2Sc_0.1O_3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Self-Assembled Nanocomposite Based on SrCo_0.7Fe_0.2Sc_0.1O_3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Chemical stability aspects of BaCe_0.7–xFe_xZr_0.2Y_0.1O_3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Effect of octahedral occupancy of bimetal-doping and CO2-induced surface reconstruction on oxygen reduction reaction of cobalt-based perovskite oxides

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Co and Hf co-doped BaFeO3 cathode with obviously enhanced catalytic activity and CO2 tolerance for solid oxide fuel cell

Cited by 10 publications

References 40 publications

Self-Assembled Nanocomposite Based on SrCo0.7Fe0.2Sc0.1O3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Self-Assembled Nanocomposite Based on SrCo0.7Fe0.2Sc0.1O3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Chemical stability aspects of BaCe0.7–xFexZr0.2Y0.1O3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Effect of octahedral occupancy of bimetal-doping and CO2-induced surface reconstruction on oxygen reduction reaction of cobalt-based perovskite oxides

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Self-Assembled Nanocomposite Based on SrCo_0.7Fe_0.2Sc_0.1O_3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Self-Assembled Nanocomposite Based on SrCo_0.7Fe_0.2Sc_0.1O_3−δ as an Efficient Intermediate-to-Low-Temperature SOFC Cathode

Chemical stability aspects of BaCe_0.7–xFe_xZr_0.2Y_0.1O_3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells