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Advanced Functional Materials for Solid Oxide Electrochemical Cells
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Advanced Functional Materials for Solid Oxide Electrochemical Cells

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 32001

Special Issue Editor

Dr. Dmitry Medvedev

E-Mail Website
Guest Editor
Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, 620066 Ekaterinburg, Russia
Interests: electrochemistry; energy conversion technology; hydrogen production; electrochemical analysis; solid state chemistry and electrochemistry; solid oxide fuel cells (SOFCs); solid oxide electrolysis cells (SOECs); protonic ceramic fuel cells (PCFCs); protonic ceramic electrolysis cells (PCECs); reversible solid oxide cells (rSOCs); sensors; energy conversion; steam electrolysis; proton transportation; chemical engineering, synthesis and characterization of solid oxide materials with different nature of conductivity (ionic, electronic, mixed) for energy conversion technologies; design and fabrication of solid oxide electrochemical cells (fuel cells, electrolysis cells, sensors, pumps, converters, membrane reactors)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Continuous energy demand causes many worldwide problems, including greenhouse gas emission, global pollution and temperature change and consumption of limited fossil fuels sources. As a result, renewable and electrical storage technologies are attracting increasing attention. In this regard, solid oxide cells (SOCs) are at the forefront of current trends in the design and development of environmentally friendly devices which enable various electrochemical conversion processes with high efficiency and performance to be carried out. Although many promising results have been recently reached, investigations relating to material issues and different applied aspects of SOCs are still of great importance to overcoming existing fundamental and technological issues. Following this key direction, I am pleased to announce the Special Issue “Advanced functional materials for solid oxide electrochemical cells” in the journal Materials. The aim of this SI is to collect high quality review articles, forming a platform for the discussion of advances, current trends and challenges of solid oxide materials.

The key foci of interest include:

  • Chemical design of new electrolytes and electrodes for solid oxide electrochemical cells;
  • Other functional (glass, interconnect, membrane, protect/buffer) materials for solid oxide electrochemical cells;
  • Materials modelling for forecasting and functional properties optimization.

Dr. Dmitry Medvedev
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • SOFCs
  • SOECs
  • membranes
  • electrochemistry
  • solid state ionics
  • proton transport
  • functional materials

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Published Papers (6 papers)

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Research

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14 pages, 6876 KiB  
Article
Improved Electrochemical Performance of Sm0.2Ce0.8O1.9 (SDC) Nanoparticles Decorated SrCo0.8Fe0.1Ga0.1O3−δ (SCFG) Fiber, Fabricated by Electrospinning, for IT-SOFCs Cathode Application
by Marzieh Kiani and Mohammad Hossein Paydar
Materials 2023, 16(1), 399; https://doi.org/10.3390/ma16010399 - 1 Jan 2023
Cited by 4 | Viewed by 1693
Abstract
This paper examines the electrochemical and microstructural features of SrCo0.8Fe0.1Ga0.1O3−δ (SCFG) with a fibrous structure infiltrated by an SDC electrolyte for use as a cathode in solid oxide fuel cells (SOFCs). An electrospinning process is used [...] Read more.
This paper examines the electrochemical and microstructural features of SrCo0.8Fe0.1Ga0.1O3−δ (SCFG) with a fibrous structure infiltrated by an SDC electrolyte for use as a cathode in solid oxide fuel cells (SOFCs). An electrospinning process is used to produce SCFG fibers. In a symmetrical cell, Sm0.2Ce0.8O1.9 (SDC) nanoparticles are infiltrated into the porous fibrous SCFG cathode layer after it was applied to the SDC dense electrolyte. Electrochemical impedance spectroscopy (EIS) analysis reveals that the polarization resistance of the SCFG cathode with fiber morphology is significantly lower than that of the same combination with powder morphology. In addition, it is shown that infiltration of SDC oxygen ion conductor nanoparticles enhanced electrochemical performance. The lowest value of polarization resistance, 0.03 Ω cm2 at 800 °C, is attained by the SCFG with a fibrous structure containing 14 wt% SDC nanoparticles. Full article
(This article belongs to the Special Issue Advanced Functional Materials for Solid Oxide Electrochemical Cells)
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Review

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23 pages, 17082 KiB  
Review
A Review of X-ray Photoelectron Spectroscopy Technique to Analyze the Stability and Degradation Mechanism of Solid Oxide Fuel Cell Cathode Materials
by Mustafa Anwar, Muhammed Ali Shaikh Abdul, Uneeb Masood Khan, Muhammad Hassan, Asif Hussain Khoja and Andanastuti Muchtar
Materials 2022, 15(7), 2540; https://doi.org/10.3390/ma15072540 - 30 Mar 2022
Cited by 16 | Viewed by 3785
Abstract
Nondestructive characterization of solid oxide fuel cell (SOFC) materials has drawn attention owing to the advances in instrumentation that enable in situ characterization during high-temperature cell operation. X-ray photoelectron spectroscopy (XPS) is widely used to investigate the surface of SOFC cathode materials because [...] Read more.
Nondestructive characterization of solid oxide fuel cell (SOFC) materials has drawn attention owing to the advances in instrumentation that enable in situ characterization during high-temperature cell operation. X-ray photoelectron spectroscopy (XPS) is widely used to investigate the surface of SOFC cathode materials because of its excellent chemical specificity and surface sensitivity. The XPS can be used to analyze the elemental composition and oxidation state of cathode layers from the surface to a depth of approximately 5–10 nm. Any change in the chemical state of the SOFC cathode at the surface affects the migration of oxygen ions to the cathode/electrolyte interface via the cathode layer and causes performance degradation. The objective of this article is to provide a comprehensive review of the adoption of XPS for the characterization of SOFC cathode materials to understand its degradation mechanism in absolute terms. The use of XPS to confirm the chemical stability at the interface and the enrichment of cations on the surface is reviewed. Finally, the strategies adopted to improve the structural stability and electrochemical performance of the LSCF cathode are also discussed. Full article
(This article belongs to the Special Issue Advanced Functional Materials for Solid Oxide Electrochemical Cells)
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31 pages, 6585 KiB  
Review
Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells
by Andrei I. Klyndyuk, Ekaterina A. Chizhova, Dzmitry S. Kharytonau and Dmitry A. Medvedev
Materials 2022, 15(1), 141; https://doi.org/10.3390/ma15010141 - 25 Dec 2021
Cited by 53 | Viewed by 8344
Abstract
Development of new functional materials with improved characteristics for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is one of the most important tasks of modern materials science. High electrocatalytic activity in oxygen reduction reactions (ORR), chemical and thermomechanical compatibility [...] Read more.
Development of new functional materials with improved characteristics for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is one of the most important tasks of modern materials science. High electrocatalytic activity in oxygen reduction reactions (ORR), chemical and thermomechanical compatibility with solid electrolytes, as well as stability at elevated temperatures are the most important requirements for cathode materials utilized in SOFCs. Layered oxygen-deficient double perovskites possess the complex of the above-mentioned properties, being one of the most promising cathode materials operating at intermediate temperatures. The present review summarizes the data available in the literature concerning crystal structure, thermal, electrotransport-related, and other functional properties (including electrochemical performance in ORR) of these materials. The main emphasis is placed on the state-of-art approaches to improving the functional characteristics of these complex oxides. Full article
(This article belongs to the Special Issue Advanced Functional Materials for Solid Oxide Electrochemical Cells)
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28 pages, 4990 KiB  
Review
Materials AIILnInO4 with Ruddlesden-Popper Structure for Electrochemical Applications: Relationship between Ion (Oxygen-Ion, Proton) Conductivity, Water Uptake, and Structural Changes
by Nataliia Tarasova and Irina Animitsa
Materials 2022, 15(1), 114; https://doi.org/10.3390/ma15010114 - 24 Dec 2021
Cited by 39 | Viewed by 4487
Abstract
In this paper, the review of the new class of ionic conductors was made. For the last several years, the layered perovskites with Ruddlesden-Popper structure AIILnInO4 attracted attention from the point of view of possibility of the realization of ionic [...] Read more.
In this paper, the review of the new class of ionic conductors was made. For the last several years, the layered perovskites with Ruddlesden-Popper structure AIILnInO4 attracted attention from the point of view of possibility of the realization of ionic transport. The materials based on Ba(Sr)La(Nd)InO4 and the various doped compositions were investigated as oxygen-ion and proton conductors. It was found that doped and undoped layered perovskites BaNdInO4, SrLaInO4, and BaLaInO4 demonstrate mixed hole-ionic nature of conductivity in dry air. Acceptor and donor doping leads to a significant increase (up to ~1.5–2 orders of magnitude) of conductivity. One of the most conductive compositions BaNd0.9Ca0.1InO3.95 demonstrates the conductivity value of 5 × 10−4 S/cm at 500 °C under dry air. The proton conductivity is realized under humid air at low (<500 °C) temperatures. The highest values of proton conductivity are attributed to the compositions BaNd0.9Ca0.1InO3.95 and Ba1.1La0.9InO3.95 (7.6 × 10−6 and 3.2 × 10−6 S/cm correspondingly at the 350 °C under wet air). The proton concentration is not correlated with the concentration of oxygen defects in the structure and it increases with an increase in the unit cell volume. The highest proton conductivity (with 95−98% of proton transport below 400 °C) for the materials based on BaLaInO4 was demonstrated by the compositions with dopant content no more that 0.1 mol. The layered perovskites AIILnInO4 are novel and prospective class of functional materials which can be used in the different electrochemical devices in the near future. Full article
(This article belongs to the Special Issue Advanced Functional Materials for Solid Oxide Electrochemical Cells)
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37 pages, 7178 KiB  
Review
Opportunities, Challenges and Prospects for Electrodeposition of Thin-Film Functional Layers in Solid Oxide Fuel Cell Technology
by Elena Kalinina and Elena Pikalova
Materials 2021, 14(19), 5584; https://doi.org/10.3390/ma14195584 - 26 Sep 2021
Cited by 22 | Viewed by 4685
Abstract
Electrolytic deposition (ELD) and electrophoretic deposition (EPD) are relevant methods for creating functional layers of solid oxide fuel cells (SOFCs). This review discusses challenges, new findings and prospects for the implementation of these methods, with the main emphasis placed on the use of [...] Read more.
Electrolytic deposition (ELD) and electrophoretic deposition (EPD) are relevant methods for creating functional layers of solid oxide fuel cells (SOFCs). This review discusses challenges, new findings and prospects for the implementation of these methods, with the main emphasis placed on the use of the ELD method. Topical issues concerning the formation of highly active SOFC electrodes using ELD, namely, the electrochemical introduction of metal cations into a porous electrode backbone, the formation of composite electrodes, and the electrochemical synthesis of perovskite-like electrode materials are considered. The review presents examples of the ELD formation of the composite electrodes based on porous platinum and silver, which retain high catalytic activity when used in the low-temperature range (400–650 °C). The features of the ELD/EPD co-deposition in the creation of nanostructured electrode layers comprising metal cations, ceramic nanoparticles, and carbon nanotubes, and the use of EPD to create oriented structures are also discussed. A separate subsection is devoted to the electrodeposition of CeO2-based film structures for barrier, protective and catalytic layers using cathodic and anodic ELD, as well as to the main research directions associated with the deposition of the SOFC electrolyte layers using the EPD method. Full article
(This article belongs to the Special Issue Advanced Functional Materials for Solid Oxide Electrochemical Cells)
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28 pages, 7390 KiB  
Review
Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells
by Lubov Skutina, Elena Filonova, Dmitry Medvedev and Antoine Maignan
Materials 2021, 14(7), 1715; https://doi.org/10.3390/ma14071715 - 31 Mar 2021
Cited by 44 | Viewed by 5458
Abstract
The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes [...] Read more.
The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes that result in the degradation of SOFC performance. In this regard, double perovskite molybdates are possible alternatives to conventional Ni-based cermets. The present review provides the fundamental properties of four members: Sr2NiMoO6-δ, Sr2MgMoO6-δ, Sr2FeMoO6-δ and Sr2Fe1.5Mo0.5O6-δ. These properties vary greatly depending on the type and concentration of the 3d-element occupying the B-position of A2BB’O6. The main emphasis is devoted to: (i) the synthesis features of undoped double molybdates, (ii) their electrical conductivity and thermal behaviors in both oxidizing and reducing atmospheres, as well as (iii) their chemical compatibility with respect to other functional SOFC materials and components of gas atmospheres. The information provided can serve as the basis for the design of efficient fuel electrodes prepared from complex oxides with layered structures. Full article
(This article belongs to the Special Issue Advanced Functional Materials for Solid Oxide Electrochemical Cells)
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