Sketch of solid oxide fuel cell operated on hydrogen and air. Perovskite and layered oxide materials for intermediate. Study of perovskite structure cathode materials and protective coatings on interconnect for solid oxide fuel cells fengyu shen abstract solid oxide fuel cells sofcs are promising devices to convert chemical energy to electrical energy due to their high efficiency, fuel flexibility, and low emissions. Effect of tolerance factor on possible perovskite structure. Perovskite oxide for solid oxide fuel cells fuel cells. In this work a few examples of perovskite cathode and anode materials and. Perovskite oxides breakthrough to extend fuel cell life. Perovskite oxidation state classifications and examples. Perovskite oxides have high catalytic activities for oxygen electrocatalysis competitive to platinum at elevated temperatures. At room temperature, both sr2comoo6 and sr2nimoo6 are tetragonal i4m. C solid oxide fuel cells require electrical and mechanical stability to maintain performance during the cell lifetime. Xray diffraction pattern shows the orthorhombic structure with double lattice parameters from the primitive perovskite cell in pmmm space group. Fuel cells convert the chemical energy stored in fuels such as hydrogen into electricity. Doped perovskite materials for solid oxide fuel cell sofc.
Schematic showing basic operating principle of a fuel cell. Perovskite oxide for solid oxide fuel cells ebook by. Goodenough4 and yang shaohorn1,2 the prohibitive cost and scarcity of the noblemetal catalysts needed for catalysing the oxygen reduction reaction orr. The flexibility of perovskite solid oxide fuel cell. The suitability of double perovskite oxides of composition sr2mg1xnixmoo6 smnm, x 00. Layered perovskitetype oxides were characterized by electrochemical measurement. Designing perovskite oxides for solid oxide fuel cells. Perovskite oxide for solid oxide fuel cells springerlink. Sometimes, materials in bulk sizes exhibit properties totally different than when they are sliced in pieces only a few molecules wide. Here, it is applied for the first time as a cathode for lowtemperature solid oxide fuel cells ltsofcs. Schematic of button cell showing a three electrode geometry. A highperforming sulfurtolerant and redoxstable layered. The past decade has observed rapid growth in the development of cobalt.
Pdf designing perovskite oxides for solid oxide fuel cells. Development of perovskite and intergrowth oxide cathodes. Metal oxide layers improve the stability of perovskite. In particular, the high stability of the perovskite structure compared to other crystal arrangements and its ability, given the correct selection of a and b cations, to maintain a large oxygen vacancy concentration makes it a good.
The five types of fuel cell devices and their respective parameters. Use features like bookmarks, note taking and highlighting while reading perovskite oxide for solid oxide fuel cells fuel cells and hydrogen energy. Rational design of perovskite based anode materials for. Recent advances in the development of anode materials for solid. The cell currentvoltage characteristics and the anode resistance dependence on hydrogen partial. Intermediate temperature solid oxide fuel cells itsofcs offer an attractive route to low carbon power generation that is both scalable and fuel flexible. Several lanthanide based layered perovskitestructured oxides demonstrate outstanding oxygen diffusion rate, favorable electronic conductivity, and good oxygen surface exchange kinetics, owing to asite ordered structure in which lanthanide and alkaliearth ions occupy.
Performance of solid alkaline fuel cells employing layered. Doubleperovskites sr2mmoo6 m co, ni have been investigated as anode materials for a solid oxide fuel cell. Solid oxide fuel cell sofc is a promising alternative energy source. Drawing of a solid oxide cell solid oxide fuel cells sofc use a hard, ceramic compound of metal like calcium or zirconium oxides chemically, o 2 as electrolyte. Synthesis and characterisation of the perovskiterelated. Solid oxide fuel cells illinois institute of technology. For example, eu 3 o 4, a mixed oxide, consists of euiii and euii in 6 or 8coordination, respectively. Surface strontium enrichment on highly active perovskites. Design principles for oxygenreduction activity on perovskite oxide catalysts for fuel cells and metalair batteries jin suntivich1,huberta. They can have efficiencies of over 60% when converting fuel to electricity.
However, little is known about the oxide surface chemistry that influences the activity near ambient oxygen partial pressures, which hampers the design of highly active catalysts for many cleanenergy technologies such as solid oxide fuel cells. Gasteiger2, naoaki yabuuchi2, haruyuki nakanishi3, john b. Perovskite oxides for solid oxide fuel cells provides insight into the materials aspects of one of the most promising fuel cell types available. Cathode, perovskite, solid oxide fuel cells, oxygen reduction reaction, stability. Electrical properties and dimensional stability of ce. Solid oxide fuel cell and power system development at pnnl. Perovskite oxide for solid oxide fuel cells tatsumi ishihara. It exhibits large lattice parameters, high oxygen reduction reaction orr activity, exceptional lowtemperature. Mixed conducting perovskite oxides and related structures serving as. Studies of perovskitebased materials in solid oxide fuel. They do so by reacting the fuel with oxygen or another oxidizing agent that can strip electrons from the fuel. A solid oxide fuel cell or sofc is an electrochemical conversion device that. The continuing development of fuel cells offers promising technologies for the conversion of chemical energy from hydrocarbon fuels into electricity without forming air pollutants. Perovskites as potential cathodes for solidoxide fuel cells mdpi.
It does not mean, however, there are no technical issues concerning the electrode materials for sofcs. Perovskite oxide for solid oxide fuel cells fuel cells and hydrogen energy kindle edition by ishihara, tatsumi. The samples contain a limited concentration of oxygen vacancies in the reducing. Jin goo lee and yong gun shul, physical and electrochemical properties of la0. Sr and nidoped lacoo3 and lafeo3 perovskites new cathode materials for solidoxide fuel cells keqin huang, hee y. They have the potential to be applied in improved solar thermochemical fuel production, to create nonvolatile memory chips for computers, and they also hold the key to extending the life of fuel cell electrodes however, this class of oxide materials has always. Pdf on jan 1, 2011, m gazda and others published perovskites in solid. An sofc usually consists of two porous electrodes separated by a dense, oxide ion conducting electrolyte. Recent advances in perovskitetype materials for solid.
Yttriastabilized zirconia is perhaps the material with the most potential as an electrolyte in solid oxide fuel cells sofcs, owing to its stability and nearunity ionic transference number 5. A perovskite oxide with high conductivities in both air and reducing atmosphere for use as electrode for solid oxide fuel cells. Doubleperovskite anode materials sr2mmoo6 m co, ni. Another another strategy to increase the ionic conductivity of the material is through the production of. Free perovskite cathodes for solid oxide fuel cells. Perovskite oxides comprise large families among the structures of oxide compounds, and several perovskiterelated structures are also known. Schematic diagram showing the operating principles of a solid oxide fuel cell figure 2. Solid oxide fuel cells sofc offer the advantage of using less expensive oxide.
Cobaltfree perovskite electrode has compatible thermal expansion coefficient matching with the electrolyte and the reversible operation to inhibit the segregation of sr. Part of the fuel cells and hydrogen energy book series fchy in some special cases, oxides consisting of a single cation in different oxidation states are also classified as mixed oxides. Perovskite materials, particularly of the lamo 3 type, where m is typically a transition metal, have in increasing numbers been found to possess mixed ionicelectronic conductivity. A perovskite oxide with high conductivities in both air. Doubleperovskite anode materials sr2mmoo6 m co, ni for. Rds for surface oxygen incorporation by combining spectroscopic. Us8124037b2 perovskite materials for solid oxide fuel. Improved sinterability, microstructure, and reduced film cracking result in high power density of fuel cells.
Solid oxide fuel cells sofcs have significant advantages over other fuel cell types, such as high efficiency, flexibility in fuel, high reliability, simple balance of plant bop and a. Lscm25 have been investigated with regard to synthesis and processing related problems. Development of alternative ceramic oxide anode materials is a key step for direct hydrocarbon solid oxide fuel cells sofcs. This novel assembly helps increase the service life of this kind of solar cells by over 10 times, with just a minimal loss to its conversion efficiency. Abstract solid oxide fuel cells sofcs are the most widely used fuel cells. Synthesis and processing of perovskite oxides for solid. Five kinds of perovskite oxides lasr3fe3o10, nalatio4, sr4co1. An inherently lowcost solid state reaction method is described. Solid oxide fuel cells sofcs have significant advantages over other fuel cell types, such as high efficiency, flexibility in fuel, high reliability, simple balance of. Perovskite oxides have for a number of years promised to be a breakthrough material in many fields in industrial chemistry. Study of perovskite structure cathode materials and. Model for effective conductivity in granular electrode structures pdf. Structure and properties of perovskite oxides springerlink.
Fuel cell technology is quite promising for conversion of chemical energy of hydrocarbon fuels into electricity without forming air pollutants. Perovskite oxides for solid oxide fuel cells provides comprehensive and uptodate information on the materials, properties, and performance for sofcs and is appropriate for researchers and. The forefront researches on sofc cathodes with miec properties include perovskite structures that combine a high tolerance to oxygen. Yang shaohorn and a team of researchers have discovered how a very thin sheet of a material called strontiumsubstituted lanthanum cobalt perovskite, aka lsc, can help solid oxide fuel cells sofc produce a lot. Perovskites for stable, high activity solid oxide fuel.
Goodenou9h texas materials institute, the university of texas at austin, austin, texas 78712, usa abstract an improved cathode material f or a solidoxide fuel cell would be a mixed electronic and oxideion conductor with. Perovskitetype oxides with the general formula abo3 have been widely studied and are utilized in a large range of applications due to their tremendous versatility. Electrode materials for intermediate temperature 500700. A computational approach by suwit suthirakun bachelor of science chiang mai university, chiang mai thailand, 2007 submitted in partial fulfillment of the requirements for the degree of doctor of philosophy in chemical engineering college of engineering and computing. Solid oxide fuel cells sofcs may come to play an important role, as they are able to produce energy by direct. Compared to other types of fuel cells, a solid oxide fuel cell sofc is. Because of their diversity in chemical composition, properties and high chemical stability, perovskite oxides are widely used for preparing solid oxide fuel cell sofc components. Combining perovskite with other conductors or active catalysts to. Sofcs are an ecofriendly alternative to dieselgas generators and are capable of providing days, weeks. Development of perovskite and intergrowth oxide cathodes for intermediate temperature solid oxide fuel cells. Fuel must have very low sulfur levels perovskite based sr2femoo6d sfm, as an electrode material for symmetric solid oxide fuel cells sofcs, has been synthesized by a sucrosemodified combustion technique.
Zr and y codoped perovskite as a stable, high performance. New perovskite materials for sensors and low temperature. Combining their performance in sulfur containing fuels with. Studies of perovskitebased materials in solid oxide fuel cells. Hydrogen oxidation mechanisms on perovskite solid oxide. Solid oxide fuel cells sofc can achieve high efficiency without using costly precious metal catalysts, which is regarded as a great advantage of sofc compared to polymer electrolyte fuel cells pefc and phosphoric acid fuel cells pafc. Solid oxide fuel cells s olid oxide fuel cells sofcs offer a clean, lowpollution technology to electrochemically generate electricity at high efficiencies. In order to produce these devices it is essential that effective electrode materials that act as oxygen reduction catalysts are developed, and abo 3 perovskite based oxides have been. For example, a high overall efficiency can be achieved by combining with a gas. Pdf perovskitetype oxides with the general formula abo 3 have been widely studied and are. Single double perovskite structures could be obtained up to x 0. Download it once and read it on your kindle device, pc, phones or tablets. For use as cathodes in fuel cells the presence of mixed ionicelectronic conductivity. Reversible solid oxide cells have received increasing attention due to high efficiency.
Examples of ionic conductivity in perovskite materials. Electrical, chemical, and electrochemical properties of. Anode performance optimization and degradation mechanism of electrolyte by tong gao a thesis submitted in partial fulfillment of the requirements for the degree of master of science in chemical engineering department of chemical and materials engineering university of alberta. Rational design of perovskite based anode materials for solid oxide fuel cells. Socs are a general class of electrochemical devices using a solid oxide electrolyte, in which energy can be either stored in the form of a chemical fuel. Effect of sr segregation on perovskite oxide electrode for solid oxide electrochemical cells as an environmentfriendly future energy technology, socs have attracted considerable attention. A solid oxide fuel cell sofc is an electrochemical device that converts chemical energy into electrical energy with energy conversion efficiencies in the range of 4080% as compared to 35% for a diesel engine and 2942% for a steam generator. Pdf perovskites in solid oxide fuel cells researchgate. In the present work materials alternative to niysz cermets anodes for solid oxide fuel cells sofcs have been studied in order to overcome the problems related to catalytic deposition of carbon and the limited tolerance to sulphur. Solid oxide fuel cell anode coated with a catalyst prelayer is developed.
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