Short review on cobalt-free cathodes for solid oxide fuel cells

Baharuddin, Nurul Akidah; Muchtar, Andanastuti; Somalu, Mahendra Rao

doi:10.1016/j.ijhydene.2016.04.097

Cited by 120 publications

(65 citation statements)

References 43 publications

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“…Cobalt-containing cathodes are known for their good electrochemical performances at low-intermediate operating temperatures (20-700 • C) because of their excellent activity in the oxygen reduction reaction [38,[51][52][53]. However, Cobalt-containing cathode materials exhibit high TEC values caused by the spin-state transition associated with Co 3+ formation, leading to a mismatch with the electrolyte and a consequent thermomechanical instability of the electrochemical cell [54]. The higher cost of cobalt itself further limits the Co amount in the electrode formulations, encouraging new strategies leading to a good compromise between efficiency and stability [55].Cerium and/or Cobalt-doped SrFeO 3-δ perovskite-type oxides have been already studied as cathode materials for 48,56], or oxygen membranes [46], although they have lower performance than the most commonly used LaFeO 3 [57].…”

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confidence: 99%

Sucrose-Assisted Solution Combustion Synthesis of Doped Strontium Ferrate Perovskite-Type Electrocatalysts: Primary Role of the Secondary Fuel

et al. 2020

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The methodologies and experimental conditions used for the synthesis of cathode materials for electrochemical devices strongly influence their electrocatalytic performance. In particular, solution combustion synthesis is a convenient and versatile methodology allowing a fine-tuning of the properties of the material. In this work, we used for the first time a sucrose assisted-solution combustion synthesis for the preparation of Cerium and Cobalt-doped SrFeO3–δ electrocatalysts and we investigated the effect of polyethylene glycol (PEG) addition as a secondary fuel on their structural, microstructural, redox and electrochemical properties. The perovskite-type powders were characterized by X-ray diffraction coupled with Rietveld refinement, scanning, and high-resolution transmission electron microscopies, thermogravimetric analysis, nitrogen adsorption measurements, and temperature-programmed reduction. Electrical conductivity and overpotential measurements were performed after the deposition of the powders onto a Gd-doped ceria electrolyte pellet. Stable high-valence B-site cations were detected in the powders prepared from sucrose-PEG fuel mixtures, although a substantial improvement of the conductivity and a decrease of the overpotential values were obtained only with high molecular weight PEG. The superior electrochemical performance obtained using PEG with high molecular weight has been ascribed to a faster interaction of the powder with the oxygen gas phase favored by the nanometer-sized crystalline domains.

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confidence: 99%

Sucrose-Assisted Solution Combustion Synthesis of Doped Strontium Ferrate Perovskite-Type Electrocatalysts: Primary Role of the Secondary Fuel

et al. 2020

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“…x Sr x MnO 3 ) along with YSZ electrolyte. However, due to its high activation energy and increased polarization resistance in lower temperatures, LSM can decrease SOFC performance at lower operation temperatures [14,43]. In addition, the material can react with YSZ electrolyte at temperatures over than 1100 C [44].…”

Section: Cathodementioning

confidence: 99%

Novel materials for solid oxide fuel cell technologies: A literature review

Silva

Souza

2017

International Journal of Hydrogen Energy

330

110

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This study aims to review novel materials for solid oxide fuel cell (SOFC) applications covered in literature. Thence, it was found that current SOFC operating conditions lead to issues, such as carbon surface deposition, sulfur poisoning and quick component degradation at high temperatures, which make it unsuitable for a few applications. Therefore, many researches are focused on cell performance enhancement through replacing the materials being used in order to improve properties and/or reduce operating temperatures. Most modifications in the anode aim to avoid some issues concerning conventionally used Ni-based materials, such as carbon deposition and sulfur poisoning, besides enhancing catalytic activity, once this component is directly exposed to the fuel. It was also found literature about the cathode with the aim of developing a material with enhanced properties in a wider temperature range, which has been compared to the currently used one: LSM perovskite (La 1-x Sr x MnO 3). Novel electrolyte materials can have ionic or protonic conductivity, thus performance degradation must be avoided at several operating conditions. In order to enhance its electrochemical performance, different materials for electrodes (cathode and anode) and electrolytes have been assessed herein.

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“…This major drawback has brought the attention of researchers to lower the operating temperature (<1000 °C). Thus, a new operating temperature zone called intermediate-to-low temperature (IT-LTSOFC) zone was proposed [13]. A typical IT-SOFC operates below 800 °C, and LT-SOFCs operate below 600 °C [14].…”

Section: Materials Challengesmentioning

confidence: 99%