A new strategy for improving the electrochemical performance of perovskite cathodes: pre-calcining the perovskite oxide precursor in a nitrogen atmosphere

Chen, Jing; Zhao, Zhenxiang; Ye, Feng; Sun, Xuzhuo; Li, Bo; Wan, Dongjin; Tan, Yuan

doi:10.1039/d1na00031d

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…Encouragingly, as shown in Figure a, the BSFY air electrode conveys ultralow area-specific resistances (ASRs) of 0.014, 0.026, 0.063, 0.177, and 0.578 Ω cm 2 at 700, 650, 600, 550, and 500 °C, respectively. Such electroactivity significantly surpasses that of high-performance cobalt-free and cobalt-rich perovskite-type cathode materials ever reported (Figure b), ,,,− demonstrating its superiority for ORR. The durability of the BSFY electrode is further examined in a long-term run at 600 °C.…”

Section: Resultsmentioning

confidence: 72%

Facile Approach to Enhance Activity and CO₂ Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

et al. 2022

ACS Appl. Mater. Interfaces

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Developing high-performance and cost-effective cathodes is ever-increasingly vital for the advancement of intermediate-temperature solid oxide fuel cells (IT-SOFCs). To facilitate the popularization of nonprecious metallic and cobalt-free oxygen reduction electrodes, herein, we propose a novel perovskite-based BaFeO3−δ (BF) matrix, Ba0.75Sr0.25Fe0.875Y0.125O3−δ (BSFY), as a highly active cathode for IT-SOFCs. To our satisfaction, the BSFY electrode showcases a low area-specific resistance of 0.063 Ω cm2, as well as a high peak power density of 1288 mW cm–2 at 600 °C, yielding a more than threefold improvement compared to that of its BF counterpart (371 mW cm–2). The long-term durability test highlights its practicability under the IT operating condition. When tested in 10 vol % CO2-containing air, the BSFY electrode exhibits impressive resistance against contaminants within 50 h (<0.4 Ω cm2 with a deterioration rate of ∼0.00011 Ω cm2 min–1). Coupled with its reversible response between pure air and the contaminant, the BSFY cathode is expected to be a promising cobalt-free alternative with high CO2 resistance for IT-SOFCs.

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Section: Resultsmentioning

confidence: 72%

Facile Approach to Enhance Activity and CO₂ Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

et al. 2022

ACS Appl. Mater. Interfaces

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“…However, for LNO 800 A this trend is reversed. This could be a result of lack of availability of sufficient oxygen in the lattice as it is possessing high number of oxygen vacancies initially [27,28].…”

Section: Oxygen Non-stoichiometry (δ)mentioning

confidence: 99%

Controlling phase transformation of La/Ni oxides by switching annealing conditions and their resultant pseudocapacitive behaviour

Gopi,

Reddi,

Karthik

et al. 2023

Nanotechnology

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Annealing step is a critical step in the hydrothermal assisted synthesis of La/Ni oxides such as LaNiO3−δ (LNOA) and La2NiO4+δ (LNON). In the current study, we have discovered the interlink between the atmosphere and temperature conditions which dictate the product formed. La/Ni nitrate precursors were subjected to a hydrothermal synthesis followed by an annealing step at appropriate temperature and varying atmosphere resulting in the synthesis of the corresponding oxides. The annealing temperature was varied in the range between 650 °C and 800 °C and also the annealing was carried out either in pure N2 atmosphere or air. From the x-ray diffraction analysis, it was inferred that annealing in air invariably resulted in the rhombohedral LaNiO3 (LNOA) perovskite phase, while annealing in N2 atmosphere resulted in an orthorhombic Ruddlesden–Popper phase La2NiO4 (LNON), a layered oxide containing traces of NiO phase. Typically, iodometric titrations substantiate the presence of Ni (III) which further can be correlated to the presence of oxygen vacancies (δ). Iodometric test results demarcated the difference between the two phases with absolutely minimal I2 liberated from the LNON samples proving that negligible amount of Ni (III) was present in LNON Scanning electron microscopy (SEM) images showed an agglomeration of particles annealed at higher temperatures irrespective of the atmosphere. Temperature dependent oxygen non-stoichiometry (Δδ) was analyzed through thermogravimetric analysis, wherein Δδ was inversely proportional to the annealing temperature for all of the LNOA samples. Considering that large δ values favor pseudocapacitive behaviour, it was observed LNOA oxides showed excellent pseudocapacitive behaviour compared to the LNON oxides. Dunn deconvolution of the cyclic voltammograms of LNOA 800 °C at 5 m Vs−1 indicated that diffusive contribution (66%) was predominant over capacitive contributions. The LNOA sample annealed at 800 °C displayed the highest specific capacitance of 100.3 F g−1 at 1 A g−1 current density.

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Preparation and performance study of three-dimensional interconnected structured electrodes with lamellar connections

Yang,

Wang,

et al. 2024

Chemical Engineering Journal

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A new strategy for improving the electrochemical performance of perovskite cathodes: pre-calcining the perovskite oxide precursor in a nitrogen atmosphere

Abstract: This study demonstrates a new strategy to further improve the oxygen non-stoichiometry (δ) and electrocatalytic activity of cathode by pre-calcining the perovskite oxide precursor in nitrogen atmosphere.

Cited by 3 publications

References 34 publications

Facile Approach to Enhance Activity and CO₂ Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

Facile Approach to Enhance Activity and CO₂ Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

Controlling phase transformation of La/Ni oxides by switching annealing conditions and their resultant pseudocapacitive behaviour

Preparation and performance study of three-dimensional interconnected structured electrodes with lamellar connections

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A new strategy for improving the electrochemical performance of perovskite cathodes: pre-calcining the perovskite oxide precursor in a nitrogen atmosphere

Abstract: This study demonstrates a new strategy to further improve the oxygen non-stoichiometry (δ) and electrocatalytic activity of cathode by pre-calcining the perovskite oxide precursor in nitrogen atmosphere.

Cited by 3 publications

References 34 publications

Facile Approach to Enhance Activity and CO2 Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

Facile Approach to Enhance Activity and CO2 Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

Controlling phase transformation of La/Ni oxides by switching annealing conditions and their resultant pseudocapacitive behaviour

Preparation and performance study of three-dimensional interconnected structured electrodes with lamellar connections

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Product

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Facile Approach to Enhance Activity and CO₂ Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

Facile Approach to Enhance Activity and CO₂ Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells