Anodes for Sofc: Review of Material Selection, Interface and Electrochemical Phenomena

Curi, M.; Silva, Eduardo da R.; Furtado, José Geraldo de Melo; Ferraz, Helen Conceição; Secchi, Argimiro Resende

doi:10.21577/0100-4042.20170652

Cited by 6 publications

(7 citation statements)

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“…Perovskite-based oxides, such as SrFeO 3− δ , doped-SrTiO 3− δ and La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3− δ , have been widely studied as alternative fuel electrode materials for solid oxide fuel/electrolysis cells (SOFCs/SOECs) because of their good stability. 11–16 Their catalytic activity, nevertheless, is not sufficient for practical applications. It was reported that active B-site cations, such as Ni, Co, and Fe, could exsolve from the perovskite-based oxide matrix to form metal nanoparticles on the surface upon thermal reduction or applying negative bias.…”

Section: Introductionmentioning

confidence: 99%

Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

Sun

Zhou

et al. 2022

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

Sun

Zhou

et al. 2022

J. Mater. Chem. A

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“…Despite having very high anode conductivity, the MPD found in this study was lower than the conventional Ni‐YSZ anode 40 . This was expected since Ni metal was known to function as a catalyst for hydrogen oxidation whereas Cu metal cannot.…”

Section: Resultsmentioning

confidence: 60%

“…Despite having very high anode conductivity, the MPD found in this study was lower than the conventional Ni-YSZ anode. 40 This was expected since Ni metal was known to function as a catalyst for hydrogen oxidation whereas Cu metal cannot. In Ni-YSZ anode, oxidation occurs on Ni surface whilst in this study depends on the CeO 2 surface, which was shown to be less superior to the former.…”

Section: Fuel Cell Performance Testmentioning

confidence: 99%

Sol‐gel based copper metallic layer as external anode for microtubular solid oxide fuel cell

Shabri

Rudin

Othman

et al. 2022

Intl J of Energy Research

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Solid oxide fuel cell (SOFC) performance depends greatly on the anode conductivity, which in traditional nickel-yttria stabilized zirconia (Ni-YSZ) anode is determined by the Ni content that is infamous for its coking problem under hydrocarbon fuel. Without the use of high content of Ni, anode conductivity can be elevated by adding an external metal layer on top of the anode. In this study, we present the incorporation of copper (Cu) metal layer on top of the anode of micro-tubular SOFC by applying a modified sol-gel method using syringe deposition technique at various chemical compositions and deposition cycles. Cu sol was found best to be made up of 2:1:8 ratio of Cu: citric acid: ethylene glycol, with 1.36 μm metal layer formed at 5 deposition cycle, and no obvious increase in thickness after the fifth cycle. The Cu layer elevated the conductivity by 10 10 times compared to the uncoated anode. However, the coated layer also reduced the gas permeability by 10 times in the anode, which resulted from the blocking of a nano-sized pore in the anode, rather than the micron size pore. This blocking can be resolved by increasing the amount of micron-sized pore by using pore former during anode fabrication. From electrochemical impedance spectroscopy (EIS), Cu coating reduced the ohmic resistance (R ohm ) and charge transfer resistance (R ct ). From the current-voltage curve, the maximum power density (MPD) was found to increase linearly with the increase of the Cu coating cycle, but the value is almost stagnant at 2.3 to 2.5 mW cm À2 when the coating cycle of more than 4 was employed. This suggests that anode gas permeation plays an important role in anode conductivity.The findings from this study suggested that 5 deposition cycle shows to be the optimal coating layer required to achieve the percolation threshold without unnecessary loss in permeability.

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“…In the overwhelming majority of cases, a composite based on Ni is used as an anode material [ 16 , 17 , 18 ], and the most commonly cathode materials of O-SOFC are La 1-x Sr x MnO 3 (LSM) [ 19 ] and La 1-x Sr x Co 1-y Fe y O 3 (LSCF) [ 20 ]. At the same time, extensive research isbeing conducted to find new electrode materials [ 6 , 21 , 22 , 23 , 24 , 25 ]. Another area of research that has the prospect of improving SOFC performances is the creation of nanostructures [ 26 , 27 ].…”

Section: Classification Of Sofcmentioning

confidence: 99%

Classification of Solid Oxide Fuel Cells

et al. 2022

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Solid oxide fuel cells (SOFC) are promising, environmentally friendly energy sources. Many works are devoted to the study of materials, individual aspects of SOFC operation, and the development of devices based on them. However, there is no work covering the entire spectrum of SOFC concepts and designs. In the present review, an attempt is made to collect and structure all types of SOFC that exist today. Structural features of each type of SOFC have been described, and their advantages and disadvantages have been identified. A comparison of the designs showed that among the well-studied dual-chamber SOFC with oxygen-ion conducting electrolyte, the anode-supported design is the most suitable for operation at temperatures below 800 °C. Other SOFC types that are promising for low-temperature operation are SOFC with proton-conducting electrolyte and electrolyte-free fuel cells. However, these recently developed technologies are still far from commercialization and require further research and development.

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Anodes for Sofc: Review of Material Selection, Interface and Electrochemical Phenomena

Cited by 6 publications

References 0 publications

Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

Sol‐gel based copper metallic layer as external anode for microtubular solid oxide fuel cell

Classification of Solid Oxide Fuel Cells

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