Effect of the anode microstructure on the enhanced performance of solid oxide fuel cells

Sarikaya, Ayhan; Petrovsky, Vladimir; Doğan, Fatih

doi:10.1016/j.ijhydene.2012.05.007

Cited by 46 publications

(27 citation statements)

References 57 publications

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“…Many examples of improved electrode performance using varying combinations of pore former exist . However, there are so many variables between the specific process routes that it is difficult to draw meaningful conclusions over the whole field.…”

Section: Thick Film Processingmentioning

confidence: 99%

“…Many examples of improved electrode performance using varying combinations of pore former exist. [93][94][95] However, there are so many variables between the specific process routes that it is difficult to draw meaningful conclusions over the whole field. However, it is often obvious that within any system there will be an optimum performance point where the maximum benefits of the microstructure are realized.…”

Section: Advanced Reviewmentioning

confidence: 99%

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Trends in the processing and manufacture of solid oxide fuel cells

Cassidy

2017

WIREs Energy & Environment

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Electrochemical devices based on solid‐state ceramic materials such as solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) are promising technologies which are gaining importance in today's rapidly developing energy frameworks. In particular, these high‐temperature variants offer further potential benefits such as increased fuel flexibility and higher system efficiencies. One of the significant challenges for SOFCs is the creation of robust, durable, and affordable cells. While the search for new materials remains an important research activity, the role of process development for fabrication and manufacture should not be underestimated. Indeed better understanding between materials, processing, and the resulting microstructure is vital for improving cell performance. The links between cell design and various processing techniques are explored. The most common approaches are based on thick film ceramic processes where recent trends include areas such as production of thinner tape cast layers and challenges in the application of aqueous systems to cell processing. Decoupling the processing and control of bulk and catalytic microstructures within the cell has recently been a very active area of development with techniques such as impregnation and exsolution showing increasingly promising results. Thin film techniques such as physical vapor deposition are also still being investigated for micro SOFCs or thin interfacial layers. In all cases, materials and process development should be closely linked, as high quality, reliable microstructures are essential to optimize the chemistry taking place on the materials and viable routes to manufacture are vital to transferring new materials into commercial devices. WIREs Energy Environ 2017, 6:e248. doi: 10.1002/wene.248 This article is categorized under: Fuel Cells and Hydrogen > Science and Materials

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Section: Thick Film Processingmentioning

confidence: 99%

Section: Advanced Reviewmentioning

confidence: 99%

Trends in the processing and manufacture of solid oxide fuel cells

Cassidy

2017

WIREs Energy & Environment

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“…In particular, among those steps, gas diffusion, one of the key factors affecting the gas concentration in the activation layer, is determined by electrode microstructure. Electrodes with different microstructure parameters including pore size, thickness, porosity, and tortuosity are frequently employed in SOFCs . For instance, Zhao et al prepared electrodes with porosity ranging from 15 to 43% and tortuosity ranging from 19.7 to 7.8.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Zhao et al prepared electrodes with porosity ranging from 15 to 43% and tortuosity ranging from 19.7 to 7.8. Sarikaya et al prepared Ni‐YSZ anodes with pore size between 0.1 and 2 µm. Without considering electrode microstructure‐dependent gas diffusion, inaccuracy in the evaluation of sulfur poisoning effects is inevitable since the H 2 S concentration in the activation layer is determined by gas diffusion.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effects of sulfur poisoning and gas diffusion on polarization loss in anodes of solid oxide fuel cells

Niu

Wei

et al. 2017

AIChE Journal

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Poisoning effects of sulfur compounds on the performances of solid oxide fuel cells are non‐trivial. However, the synergistic effects of gas diffusion, adsorption, desorption and reaction in anodes are typically neglected. In this work, an analytical model is derived to quantitatively evaluate the poisoning effects of H2S. The results show that sulfur poisoning correlates closely with inefficient gas diffusion for small anode pore size, small porosity/tortuosity, and low working temperatures. As compared with concentration polarization, H2S‐diffusion‐induced activation polarization in thin anodes with a large trueɛnormalτ is detrimental, especially for low‐temperature operations with a high H2S concentration and a low current density. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1127–1134, 2018

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“…They are focused on the relationship between cell electrochemical performance and the final microstructure (4)(5)(6)(7). Detailed studies are reported, where the cell's ohmic resistance is monitored in different operating conditions (8).…”

Section: Introductionmentioning

confidence: 99%

Impedance Studies of the Reduction Process in NiO-YSZ SOFC Anodes

Vladikova

Stoynov²,

Wuillemin

et al. 2015

ECS Trans.

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The aim of this study is the development of a methodology for deeper insight into the Ni-YSZ anode behavior by in situ impedance monitoring of the Ni network initial formation and changes during the redox process. The testing is performed on single bare anodes. This approach bypasses complications arising from the impedance data analysis of cells. For more complete description of the changes in the anode microstructure, gas permeability measurements are also introduced. The obtained results show that impedance can register the changes in the sample's conductivity during anode reduction, as well as during redox cycling performed in mild oxidation conditions. The oxidation rate is much slower than the reduction one. The combination of impedance with gas permeability and microstructural measurements gives new opportunities for anode optimization in respect to the ohmic and the concentration polarization.

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Effect of the anode microstructure on the enhanced performance of solid oxide fuel cells

Cited by 46 publications

References 57 publications

Trends in the processing and manufacture of solid oxide fuel cells

Trends in the processing and manufacture of solid oxide fuel cells

Synergistic effects of sulfur poisoning and gas diffusion on polarization loss in anodes of solid oxide fuel cells

Impedance Studies of the Reduction Process in NiO-YSZ SOFC Anodes

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