Novel mixed H+/e−/O2− conducting cathode material PrBa0.9K0.1Fe1.9Zn0.1O5+δ for proton-conducting solid oxide fuel cells

Liu, Bo; Li, Zongbao; Yang, Xinwei; Yan, Dong; Li, Jian; Jia, Lichao

doi:10.1039/d2ta04457a

Cited by 30 publications

(6 citation statements)

References 64 publications

(79 reference statements)

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“…Nonetheless, the current LCFMN cell outperforms cells employing conventional lithiated oxide cathodes without the entropy design. Furthermore, the performance of the cell utilizing the medium entropy designed LCFMN cathode is comparable to or even better than many perovskite cathodes for H-SOFCs [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58], as shown in Table 1, despite the fact that perovskite oxides have been the most studied cathodes for H-SOFCs up to now. Furthermore, the LCFMN cathode outperforms several newly developed high-performance nanocomposite cathodes or non-perovskite cathodes in cell performance.…”

Section: Resultsmentioning

confidence: 93%

Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells

Li,

Xu,

Yin

et al. 2023

Journal of Advanced Ceramics

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A new medium entropy material LiCo 0.25 Fe 0.25 Mn 0.25 Ni 0.25 O 2 (LCFMN) is proposed as a cathode for proton-conducting solid oxide fuel cells (H-SOFCs). Unlike traditional LiXO 2 (X = Co, Fe, Mn, Ni) lithiated oxides, which have issues like phase impurity, poor chemical compatibility, or poor fuel cell performance, the new LCFMN material mitigates these problems, allowing for the successful preparation of pure phase LCFMN with good chemical and thermal compatibility to the electrolyte. Furthermore, the entropy engineering strategy is found to weaken the covalence bond between the metal and oxygen in the LCFMN lattice, favoring the creation of oxygen vacancies and increasing cathode activity. As a result, the H-SOFC with the LCFMN cathode achieves an unprecedented fuel cell output of 1803 mW•cm −2 at 700 ℃, the highest ever reported for H-SOFCs with lithiated oxide cathodes. In addition to high fuel cell performance, the LCFMN cathode permits stable fuel cell operation for more than 450 h without visible degradation, demonstrating that LCFMN is a suitable cathode choice for H-SOFCs that combining high performance and good stability.

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Section: Resultsmentioning

confidence: 93%

Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells

Li,

Xu,

Yin

et al. 2023

Journal of Advanced Ceramics

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“…The energy required for proton migration increases with Fe doping, implying that protons in LSSF must overcome higher energy barriers than in Fe‐free LSS. However, the proton migration energy of LSSF remains low, comparable to that of other proton‐conducting oxides, 24,25 showing that proton migration is conceivable in LSSF.…”

Section: Resultsmentioning

confidence: 94%

A real proton‐conductive, robust, and cobalt‐free cathode for proton‐conducting solid oxide fuel cells with exceptional performance

Yin,

Xiao,

et al. 2023

SusMat

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The development of proton, oxygen‐ion, and electron mixed conducting materials, known as triple‐conduction materials, as cathodes for proton‐conducting solid oxide fuel cells (H‐SOFCs) is highly desired because they can increase fuel cell performance by extending the reaction active area. Although oxygen‐ion and electron conductions can be measured directly, proton conduction in these oxides is usually estimated indirectly. Because of the instability of cathode materials in a reducing environment, direct measurement of proton conduction in cathode oxide is difficult. The La0.8Sr0.2Sc0.5Fe0.5O3–δ (LSSF) cathode material is proposed for H‐SOFCs in this study, which can survive in an H2‐containing atmosphere, allowing measurement of proton conduction in LSSF by hydrogen permeation technology. Furthermore, LSSF is discovered to be a unique proton and electron mixed‐conductive material with limited oxygen diffusion capability that is specifically designed for H‐SOFCs. The LSSF is an appealing cathode choice for H‐SOFCs due to its outstanding CO2 tolerance and matched thermal expansion coefficient, producing a record‐high performance of 2032 mW cm−2 at 700°C and good long‐term stability under operational conditions. The current study reveals that a new type of proton–electron mixed conducting cathode can provide promising performance for H‐SOFCs, opening the way for developing high‐performance cathodes.

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“…for the nominal La0.7Ba0.3MnO3 in DFT calculations. This method is widely used in first-principles calculations [41][42][43]. Observable accumulations of charges (electrons) at the interface suggest that the oxygen atoms at the interface are more ionized, hence aiding the creation of Vo.…”

Section: Resultsmentioning

confidence: 99%

Attempted preparation of La _0.5Ba _0.5MnO _{3−
δ} leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells

Zhou¹,

Yin²,

Dai³

et al. 2023

Journal of Advanced Ceramics

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A La0.5Ba0.5MnO3-δ oxide was prepared using the sol-gel technique. Instead of a pure phase, La0.5Ba0.5MnO3-δ was discovered to be a combination of La0.7Ba0.3MnO3-δ and BaMnO3. The in-situ production of La0.7Ba0.3MnO3-δ+BaMnO3 nanocomposites enhanced oxygen vacancy formation compared to single-phase La0.7Ba0.3MnO3-δ-or BaMnO3, providing potential benefits as a cathode for fuel cells. Subsequently, La0.7Ba0.3MnO3-δ-+BaMnO3 nanocomposites were utilized as the cathode for proton-conducting solid oxide fuel cells (H-SOFCs), which significantly improved cell performance. At 700 o C, an H-SOFC with a La0.7Ba0.3MnO3-δ+ BaMnO3 nanocomposite cathode achieved the highest power density yet recorded for H-SOFCs with manganate cathodes: 1504 mW cm -2 . This performance was much greater than the single-phase La0.7Ba0.3MnO3-δ or BaMnO3 cathode cells. In addition, the cell demonstrated excellent working stability. First-principles calculations indicated that the La0.7Ba0.3MnO3-δ/BaMnO3 interface was crucial for the enhanced cathode performance.The oxygen reduction reaction (ORR) free energy barrier was significantly lower at the La0.7Ba0.3MnO3-δ/BaMnO3 interface than at the La0.7Ba0.3MnO3-δ or BaMnO3 surfaces, which explained the origins of the high performance and gave a guide for the construction of novel cathodes for H-SOFCs.

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Novel mixed H⁺/e⁻/O²⁻ conducting cathode material PrBa_0.9K_0.1Fe_1.9Zn_0.1O_5+δ for proton-conducting solid oxide fuel cells

Abstract: Double perovskite material PrBa0.9K0.1Fe1.9Zn0.1O5+δ (PBKFZ) has been designed by the first-principle calculation and synthesized as new cathode for proton-conducting solid oxide fuel cells. The influence of K-doping on crystal structure,...

Cited by 30 publications

References 64 publications

Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells

Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells

A real proton‐conductive, robust, and cobalt‐free cathode for proton‐conducting solid oxide fuel cells with exceptional performance

Attempted preparation of La _0.5Ba _0.5MnO _{3−
δ} leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells

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Novel mixed H+/e−/O2− conducting cathode material PrBa0.9K0.1Fe1.9Zn0.1O5+δ for proton-conducting solid oxide fuel cells

Abstract: Double perovskite material PrBa0.9K0.1Fe1.9Zn0.1O5+δ (PBKFZ) has been designed by the first-principle calculation and synthesized as new cathode for proton-conducting solid oxide fuel cells. The influence of K-doping on crystal structure,...

Cited by 30 publications

References 64 publications

Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells

Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells

A real proton‐conductive, robust, and cobalt‐free cathode for proton‐conducting solid oxide fuel cells with exceptional performance

Attempted preparation of La 0.5Ba 0.5MnO 3− δ leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells

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Novel mixed H⁺/e⁻/O²⁻ conducting cathode material PrBa_0.9K_0.1Fe_1.9Zn_0.1O_5+δ for proton-conducting solid oxide fuel cells

Attempted preparation of La _0.5Ba _0.5MnO _{3−
δ} leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells