Electrodeposition of yttria/cobalt oxide and yttria/gold coatings onto ferritic stainless steel for SOFC interconnects

Tondo, Elisabetta; Boniardi, Marco; Cannoletta, Donato; Riccardis, M.F. De; Bozzini, Benedetto

doi:10.1016/j.jpowsour.2010.02.055

Cited by 34 publications

(20 citation statements)

References 34 publications

(42 reference statements)

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“…[12] To minimize these disadvantages various protective coatings, acting as barriers for oxidation and/or Cr diffusion, have been tested. [8,[13][14][15] However, Cr poisoning still remains a serious obstacle because of limited physico-chemical insights into the behaviour of the interconnects as a part of the complex multi-material system under working conditions.…”

Section: Introductionmentioning

confidence: 99%

In Situ X‐Ray Spectromicroscopy Investigation of the Material Stability of SOFC Metal Interconnects in Operating Electrochemical Cells

et al. 2011

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The present in situ study of electrochemically induced processes occurring in Cr/Ni bilayers in contact with a YSZ electrolyte aims at a molecular-level understanding of the fundamental aspects related to the durability of metallic interconnects in solid oxide fuel cells (SOFCs). The results demonstrate the potential of scanning photoelectron microspectroscopy and imaging to follow in situ the evolution of the chemical states and lateral distributions of the constituent elements (Ni, Cr, Zr, and Y) as a function of applied cathodic potential in a cell working at 650 °C in 10(-6) mbar O(2) ambient conditions. The most interesting findings are the temperature-induced and potential-dependent diffusion of Ni and Cr, and the oxidation-reduction processes resulting in specific morphology-composition changes in the Ni, Cr, and YSZ areas.

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Section: Introductionmentioning

confidence: 99%

In Situ X‐Ray Spectromicroscopy Investigation of the Material Stability of SOFC Metal Interconnects in Operating Electrochemical Cells

et al. 2011

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“…Apart from Cr contamination, that is typical for systems employing ferritic stainless steel interconnects [2][3][4][5][6][7][8], two key mechanisms have been considered: (i) electrode delamination and (ii) cation migration and/or segregation of passivating species [9][10][11][12][13][14][15]. Delamination of the oxygen electrode seems to be due to the presence of large oxygen activity gradients that causes the formation of gaseous oxygen within the electrolyte close to the electrode/electrolyte interface, resulting in generation of nanoporosity at the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

Bozzini

Amati

Bocchetta

et al. 2015

Electrochimica Acta

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This paper reports an in situ study of the anodic behavior of a model solid oxide electrolysis cell (SOEC) by means of near-ambient pressure X-ray Photoelectron Spectroscopy (XPS) combined with near edge X-ray absorption fine structure (NEXAFS) measurements. The focus is on the anodic surface chemistry of MnO_x, a model anodic material already considered in cognate SOFC-related studies, during electrochemical operation in CO₂, CO₂/H₂O and H₂O ambients. The XPS and NEXAFS results we obtained, complemented by electrochemical measurements and SEM characterisation, reveal the chemical evolution of Mn under electrochemical control. MnO is the stable chemical form at open-circuit potential (OCP), while Mn₃O₄ forms under anodic polarisation in all the investigated gas ambients. Carbon deposits are present on the Mn electrode at OCP, but they are readily oxidised under anodic conditions. Prolonged operation of the MnO_x anode leads to pitting of the Mn films, damaging of the triple-phase boundary region and also to formation of discontinuities in the Mn patch. This is accompanied by chemical transformations of the electrolyte and formation of ZrC without impact on the surface chemistry of the Mn-based anode

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“…It is this component that lets connect the single SOFCs (individual cells) forming stacks (Figures 1(a) and 1(b)). In the last years, there is a greater tendency to develop the planar configuration for SOFC systems, and this type of configuration is capable of achieving very high power density [8,9], characterized by a very thin Electrolyte-Electrodes Assembly (EEA) deposited on an interconnect considerably thicker, but that presents a zone for gas feeding (Figure 1(c)) [6,9]. Another interconnector closes the device and this set constitutes the repeating unit which is forming the stack.…”

Section: Introductionmentioning

confidence: 99%

“…With the possibility of reducing the operating temperature of 900 0 C-1,000 0 C (HT-SOFC, high temperature SOFC) to 650 0 C-800 0 C (IT-SOFC, intermediate temperature SOFC) due to development of new materials and constructive refinements of the device that allowed the employment electrolyte reduced thicknesses, which do not require temperatures as high as those of the firstgeneration of SOFC, it became possible to use metal interconnects to replace the purely bulk ceramic interconnects based on lanthanum chromites, the which can represent significant gains in manufacturing (via simplification of procedures) and operating performance of SOFC [7,8,10]. Thus, in recent years, ferritic stainless steels (FSS) have been intensively considered for this application [5,[8][9][10][11][12]. However, about 800 0 C, FSS have problems caused by volatilization of Cr contained therein and the overgrowth of chromium oxide (Cr2O3) layer, with high electrical resistivity, which tends to increase the electrical contact resistance (ECR) between the interconnector and the SOFC electrodes, causing loss of performance and promoting the degradation of the device.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of Composite-Coated Interconnects for Use in High and Intermediate Temperature Fuel Cells

Avila¹,

Dias²,

Santana³

et al. 2014

ABM Proceedings

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High and intermediate temperature fuel cells (FC) are power generators characterized by high efficiency and their use in cogeneration systems. The single fuel cells are connected in series by the use of interconnects to form a fuel cell stack. Ferritic stainless steels have been used in the making of high and intermediate temperature operation solid oxide fuel cells interconnects. However, at high temperatures, on the order of 700-850 0 C, these steels can present significant oxidation and degradation processes, promoting increased electrical resistivity and corrosion losses that result in contamination of the electrodes and reducing the performance and the useful life of the FC. Intensive R&D activities have been made to minimize these problems and the use of composite coatings on metallic substrate has been considered. This paper evaluates the use of coatings of copper and nickel, with particles of La2O3, Y2O3, CeO2, LaCrO3 and doped chromites applied on ferritic stainless steels AISI 430, AISI 441 and Crofer22APU produced by electrodeposition. The produced samples were evaluated by microscopy techniques, gravimetric analysis and by electrothermal characterization. The most significant results were obtained with chromites coatings (LaCrO3 pure, mono-and multiple-doped) showing the combination of the best features of metal coatings, substrates and ceramic particles with semiconductor properties.

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Electrodeposition of yttria/cobalt oxide and yttria/gold coatings onto ferritic stainless steel for SOFC interconnects

Cited by 34 publications

References 34 publications

In Situ X‐Ray Spectromicroscopy Investigation of the Material Stability of SOFC Metal Interconnects in Operating Electrochemical Cells

In Situ X‐Ray Spectromicroscopy Investigation of the Material Stability of SOFC Metal Interconnects in Operating Electrochemical Cells

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

Development and Characterization of Composite-Coated Interconnects for Use in High and Intermediate Temperature Fuel Cells

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