Combining perovskite with other conductors or active catalysts to. Free perovskite cathodes for solid oxide fuel cells. Intermediate temperature solid oxide fuel cells itsofcs offer an attractive route to low carbon power generation that is both scalable and fuel flexible. Perovskite oxides for solid oxide fuel cells provides insight into the materials aspects of one of the most promising fuel cell types available. Schematic of button cell showing a three electrode geometry. 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. Perovskite oxides have high catalytic activities for oxygen electrocatalysis competitive to platinum at elevated temperatures.
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. Perovskite oxides comprise large families among the structures of oxide compounds, and several perovskiterelated structures are also known. In this work a few examples of perovskite cathode and anode materials and. Solid oxide fuel cell sofc is a promising alternative energy source. 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.
Solid oxide fuel cells s olid oxide fuel cells sofcs offer a clean, lowpollution technology to electrochemically generate electricity at high efficiencies. Perovskites for stable, high activity solid oxide fuel. Layered perovskitetype oxides were characterized by electrochemical measurement. Rational design of perovskite based anode materials for. Perovskite oxide for solid oxide fuel cells fuel cells and hydrogen energy kindle edition by ishihara, tatsumi. Doubleperovskites sr2mmoo6 m co, ni have been investigated as anode materials for a solid oxide fuel cell. 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. Cathode, perovskite, solid oxide fuel cells, oxygen reduction reaction, stability.
Solid oxide fuel cells sofcs may come to play an important role, as they are able to produce energy by direct. Abstract solid oxide fuel cells sofcs are the most widely used fuel cells. Us8124037b2 perovskite materials for solid oxide fuel. 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. A perovskite oxide with high conductivities in both air and reducing atmosphere for use as electrode for solid oxide fuel cells. Use features like bookmarks, note taking and highlighting while reading perovskite oxide for solid oxide fuel cells fuel cells and hydrogen energy.
An inherently lowcost solid state reaction method is described. Compared to other types of fuel cells, a solid oxide fuel cell sofc is. 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. Sometimes, materials in bulk sizes exhibit properties totally different than when they are sliced in pieces only a few molecules wide. C solid oxide fuel cells require electrical and mechanical stability to maintain performance during the cell lifetime. Development of perovskite and intergrowth oxide cathodes. Recent advances in perovskitetype materials for solid. The flexibility of perovskite solid oxide fuel cell. Effect of tolerance factor on possible perovskite structure. It exhibits large lattice parameters, high oxygen reduction reaction orr activity, exceptional lowtemperature. Another another strategy to increase the ionic conductivity of the material is through the production of. Solid oxide fuel cells illinois institute of technology. Solid oxide fuel cell and power system development at pnnl. For example, a high overall efficiency can be achieved by combining with a gas.
Improved sinterability, microstructure, and reduced film cracking result in high power density of 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. Synthesis and processing of perovskite oxides for solid. Metal oxide layers improve the stability of perovskite. Lscm25 have been investigated with regard to synthesis and processing related problems. 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. Doped perovskite materials for solid oxide fuel cell sofc. 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.
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. Perovskite oxide for solid oxide fuel cells tatsumi ishihara. Rds for surface oxygen incorporation by combining spectroscopic. Design principles for oxygenreduction activity on perovskite oxide catalysts for fuel cells and metalair batteries jin suntivich1,huberta. 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. Perovskite oxide for solid oxide fuel cells ebook by. 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. Solid oxide fuel cell anode coated with a catalyst prelayer is developed. 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. Surface strontium enrichment on highly active perovskites. 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. Perovskite oxide for solid oxide fuel cells springerlink.
A solid oxide fuel cell or sofc is an electrochemical conversion device that. 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. Hydrogen oxidation mechanisms on perovskite solid oxide. Goodenough4 and yang shaohorn1,2 the prohibitive cost and scarcity of the noblemetal catalysts needed for catalysing the oxygen reduction reaction orr. 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. They can have efficiencies of over 60% when converting fuel to electricity. 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. Pdf perovskitetype oxides with the general formula abo 3 have been widely studied and are. Perovskite oxide for cathode of sofcs springerlink. Pdf on jan 1, 2011, m gazda and others published perovskites in solid. Combining their performance in sulfur containing fuels with. Perovskite oxidation state classifications and examples. Sr and nidoped lacoo3 and lafeo3 perovskites new cathode materials for solidoxide fuel cells keqin huang, hee y. Structure and properties of perovskite oxides springerlink.
Solid oxide fuel cells sofc offer the advantage of using less expensive oxide. Designing perovskite oxides for solid oxide fuel cells. Effect of sr segregation on perovskite oxide electrode for solid oxide electrochemical cells as an environmentfriendly future energy technology, socs have attracted considerable attention. Perovskites as potential cathodes for solidoxide fuel cells mdpi. New perovskite materials for sensors and low temperature. At room temperature, both sr2comoo6 and sr2nimoo6 are tetragonal i4m. 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. Development of perovskite and intergrowth oxide cathodes for intermediate temperature 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. Doubleperovskite anode materials sr2mmoo6 m co, ni. For example, eu 3 o 4, a mixed oxide, consists of euiii and euii in 6 or 8coordination, respectively. Mixed conducting perovskite oxides and related structures serving as. They do so by reacting the fuel with oxygen or another oxidizing agent that can strip electrons from the fuel. Studies of perovskitebased materials in solid oxide fuel. Zr and y codoped perovskite as a stable, high performance. Perovskite oxides have for a number of years promised to be a breakthrough material in many fields in industrial chemistry. 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. Doubleperovskite anode materials sr2mmoo6 m co, ni for. Jin goo lee and yong gun shul, physical and electrochemical properties of la0. Study of perovskite structure cathode materials and. Xray diffraction pattern shows the orthorhombic structure with double lattice parameters from the primitive perovskite cell in pmmm space group. Perovskite oxide for solid oxide fuel cells tatsumi.
An sofc usually consists of two porous electrodes separated by a dense, oxide ion conducting electrolyte. 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. Single double perovskite structures could be obtained up to x 0. Fuel cell technology is quite promising for conversion of chemical energy of hydrocarbon fuels into electricity without forming air pollutants. Electrical, chemical, and electrochemical properties of. Fuel cells convert the chemical energy stored in fuels such as hydrogen into electricity.
Five kinds of perovskite oxides lasr3fe3o10, nalatio4, sr4co1. The cell currentvoltage characteristics and the anode resistance dependence on hydrogen partial. Electrical properties and dimensional stability of ce. Gasteiger2, naoaki yabuuchi2, haruyuki nakanishi3, john b. Recent advances in the development of anode materials for solid. The continuing development of fuel cells offers promising technologies for the conversion of chemical energy from hydrocarbon fuels into electricity without forming air pollutants. Perovskite and layered oxide materials for intermediate.
Pdf perovskites in solid oxide fuel cells researchgate. Electrode materials for intermediate temperature 500700. Synthesis and characterisation of the perovskiterelated. 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. 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. Studies of perovskitebased materials in solid oxide fuel cells. Here, it is applied for the first time as a cathode for lowtemperature solid oxide fuel cells ltsofcs. Schematic showing basic operating principle of a fuel cell. Pdf designing perovskite oxides for solid oxide fuel cells.
Perovskite oxides breakthrough to extend fuel cell life. Download it once and read it on your kindle device, pc, phones or tablets. Model for effective conductivity in granular electrode structures pdf. Perovskite oxide for solid oxide fuel cells fuel cells. Development of alternative ceramic oxide anode materials is a key step for direct hydrocarbon solid oxide fuel cells sofcs.
The samples contain a limited concentration of oxygen vacancies in the reducing. For use as cathodes in fuel cells the presence of mixed ionicelectronic conductivity. Examples of ionic conductivity in perovskite materials. The forefront researches on sofc cathodes with miec properties include perovskite structures that combine a high tolerance to oxygen. The suitability of double perovskite oxides of composition sr2mg1xnixmoo6 smnm, x 00.
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. Performance of solid alkaline fuel cells employing layered. Sofcs are an ecofriendly alternative to dieselgas generators and are capable of providing days, weeks. Reversible solid oxide cells have received increasing attention due to high efficiency. It does not mean, however, there are no technical issues concerning the electrode materials for sofcs. A perovskite oxide with high conductivities in both air. The five types of fuel cell devices and their respective parameters. Cobaltfree perovskite electrode has compatible thermal expansion coefficient matching with the electrolyte and the reversible operation to inhibit the segregation of sr. A highperforming sulfurtolerant and redoxstable layered. The past decade has observed rapid growth in the development of cobalt. 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. Sketch of solid oxide fuel cell operated on hydrogen and air.