Wenhui Su's research while affiliated with Harbin Institute of Technology and other places
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Publications (281)
(1-xwt%) La0.6PrSr0.4NiO4 - (xwt%) Ce0.8Pr0.2O2 (x = 0, 10, 20, 30, 40, 50), abbreviated as LPSN-xCPO, were prepared and used as composite cathode for intermediate temperature solid oxide fuel cell (IT-SOFC). XRD result suggested that no chemical reaction occurred between LPSN and CPO after sintering at 1200 degrees C for 4 h. Electrical conductivi...
The electrolyte material Ce0.85Sm0.15O1.92 (SDC) powders are synthesized by glycine nitrate processes and BaCe0.83Y0.17O3-delta (BCY) powders are synthesized by sol gel processes, respectively. Then SDC BCY composite electrolytes are prepared by mixing SDC and BCY. The SDC and BCY powders are mixed in the weight ratio of 95:5, 90:10 and 85:15 and n...
Large thermal mismatch between GdBaCo2O5+δ (GBCO) oxide and solid electrolytes remains a challenge for its application as a cathode of solid oxide fuel cells (SOFCs). To avoid sharp discontinuities in composition, a functionally graded GBCO cathode is developed, which consists of an inner layer with high electrochemical activity and good thermal co...
A novel method for fabricating Ni(NO3)2 solution impregnated YSZ (YSZ: Yttria Stabilized Zirconia) anodes for solid oxide fuel cells (SOFCs) is presented. In order to reduce the impregnation cycles and increase the reliability of the YSZ membrane, a YSZ support with a porosity of ∼60% is soaked in a saturated Ni(NO3)2 solution with an increased tem...
In this study, we will report our investigation for La0.75Sr0.25Cr0.5Mn0.5O3-delta (LSCrM) based anodes impregnated with solutions of cobalt (Co) nitrate. A YSZ supported SOFC with pure LSCrM anode and La0.7Sr0.3MnO3 (LSM) cathode exhibits the maximum power density (P-max) of 58.7 and 5.2 mW cm(-2) at 850 degrees C in dry H-2 and dry CH4. After the...
This work focuses on the effects of the reducing and sintering behavior for NiO→Ni on the microstructures and performances of conventional Ni/YSZ (YSZ: yttria-stabilized zirconia) anodes for anode-supported solid oxide fuel cells (SOFCs). A strong dependence of reducing and sintering behavior on the initial reduction temperature for NiO→Ni was demo...
The electrolyte materials Ce0.9Gd0.1O1.9 (GDC) and La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) were synthesized by means of glycine-nitrate processes, respectively, then GDC-LSGM composite electrolytes were prepared by mixing GDC and LSGM. The GDC and LSGM powders were mixed in the weight ratio of 95:5, 90:10 and 85:15 and named as GL9505, GL9010 and GL8515....
Uniform, dense and continuous coatings of La0.8Sr0.2MnO3−δ (LSM) have been successfully deposited on dense/porous La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) substrates via a one-step drop-coating process using a water-based solution in order to improve the operating stability of solid oxide fuel cell cathode. The processing conditions were optimized by precis...
We reported nano-structured Ag modified Ba0.5Sr0.5Co0.6Fe0.4O3−δ (Ag@BSCF) cathode for solid oxide fuel cells (SOFCs) that is prepared by vacuum assisted electroless deposition technique. We show that the concentration of Ag can be easily adjusted by tuning the deposition time without altering the perovskite structure of the pristine BSCF. The effe...
How prebiotic metabolic pathways could have formed is an essential
question for the origins of life on early Earth. From the abiogenetic
point of view, the emergence of primordial metabolism may be postulated
as a continuum from Earth's geochemical processes to chemoautotrophic
biochemical procedures on mineral surfaces. In the present study, we
ex...
Adsorption mechanisms of noble metals (Ag, Pd, Pt) on MnO2-terminated (001) surface and their catalytic role for oxygen adsorption have been investigated using the first-principles density functional theory calculations. The analysis of the adsorption energies reveals that the energetically favorable configuration for Ag and Pd adsorption is at the...
The perovskite-type La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM9182) with high oxygen-ionic conductivity is successfully synthesized using conventional solid-state reaction. The phase composition, grain size distribution, relative density, and oxygen-ionic conductivity of the samples are studied. The XRD result shows that the main perovskite LaGaO3 phase can be...
The effect of gas supply method on the performance of a single-chamber solid oxide fuel cell micro-stack and single cells was studied, and a novel gas supply method with separated gas vents in the gas tube was proposed. The traditional gas supply method was also investigated for comparison. Results showed that the single cells could obtain a unifor...
The molecular structural and Raman spectroscopic characteristics of β-carotene and lycopene are investigated by density functional calculations. The effects of molecular structure and solvent environment on the Raman spectra are analyzed by comparing the calculated and measured results. It is found that the B3LYP/6-31G(d) method can predict the rea...
The electrolyte materials Ce0.85Sm0.15O1.9 (SDC) and La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) are synthesized by glycine–nitrate processes, respectively. Then SDC–LSGM composite electrolytes are prepared by mixing SDC and LSGM. The SDC and LSGM powders are mixed in the weight ratio of 95:5, 90:10 and 85:15 and named as SL9505, SL9010 and SL8515. SEM shows...
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The performance of an anode-supported solid oxide fuel cell with nanosized Ce0.8Sm0.2O1.9 (SDC) impregnated GdBaCo2O5+δ (GBCO) cathode is evaluated under various operation conditions. An SDC interlayer is applied between 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte and cathode to prevent undesired chemical reaction. At 700 °C, the fuel cell...
The oxygen adsorption on Ag/LSM(0 0 1) catalysts surfaces has been investigated using first-principles density functional theory calculations. The most favorable oxygen adsorption sites are found to be atop surface Mn atoms on the MnO2-terminated surface and on the hollow positions of the La(Sr)O-terminated LSM(0 0 1) surface. The calculated adsorp...
To understand how life could have originated on early Earth, it is essential to know what biomolecules and metabolic pathways are shared by extant organisms and what organic compounds and their chemical reaction channels were likely to have been primordially available during the initial phase of the formation of prebiotic metabolism. In a previous...
Thermoelectric (TE) properties of [(Ca,Ln)2CoO3]0.62[CoO2] family, including ceramic bulks synthesized by a solid-state reaction and nano-sized compacts fabricated by a simple cold-pressure method, are systematically investigated, in terms of nanocrystallization technology, effects of doped rare-earth Ln ions, and doping level. The doped Ln ions ha...
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A perovskite-type (Ba0.5Sr0.5)0.85Gd0.15Co0.8Fe0.2O3−δ (BSGCF) oxide has been investigated as the cathode of intermediate temperature solid oxide fuel cells (IT-SOFCs). Coulometric titration, thermogravimetry analysis, thermal expansion and four-probe DC resistance measurements indicate that the introduction of Gd3+ ions into the A-site of Ba0.5Sr0...
In order to optimize the morphology of starting powder, raw GBCO powder synthesized via solid state reaction was repeatedly compacted by uniaxial die pressing at two apparent compaction pressures of 500 and 1000MPa. The particle size distribution curves and SEM images indicated that, with increasing compaction pressure and number of compaction time...
We report the enzyme-like reversible amination of four intermediates pertinent to the reductive tricarboxylic acid cycle on a photo-irradiated surface of mineral sphalerite (ZnS). Given its prevalence in the waters of early Earth, we suggest that the mineral-based photochemistry might have catalyzed the homeostasis of prebiotic metabolic systems.
Effect of characteristics of Sm0.2Ce0.8O1.9 (SDC) powder as a function of calcination temperature on the fabrication of dense and flat anode-supported SDC thin electrolyte cells has been studied. The results show that the calcination temperature has a significant effect on the particle size, degree of agglomeration, and sintering profiles of the SD...
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In order to develop cathode materials for intermediate temperature solid oxide fuel cell (IT-SOFC), (Ba0.5Sr0.5)1 − xGdxCo0.8Fe0.2O3 − δ (BSGCF: x = 0, 0.02, 0.05, 0.08, and 0.1) oxides were synthesized by sol–gel method. The effects of Gd-doping on the phase structure, thermal expansion coefficient (TEC), thermogravimetric (TG) and the electrical...
In the present paper, the catalytic role of Ag in the oxygen adsorption of LaMnO3(001) surface has been theoretically investigated using first-principles calculations based on the density functional theory (DFT) and pseudopotential method. The O2 adsorption energy is larger for the vertical adsorption and the covalent bond was formed between O2 mol...
Pyrite is a common mineral at many mining sites. In this study, the mineral pyrite was studied as a Fenton-like reagent for environmental concerns. We selected lactate as a model target molecule to evaluate the Fenton-like catalytic efficiency of pyrite upon organic oxidation. A complete set of control experiments in both aerobic and anaerobic atmo...
The Seebeck coefficient is a function of carrier concentration and configurational entropy. In this report, we semi-theoretically
investigate the Seebeck coefficient of Ln
x
Ca1−x
MnO3 (Ln=Rare-earth) perovskites based on the electronic structure of the 3d orbitals of Mn ions, using the developed Heikes model, Boltzmann transport model, and diffusi...
Cu is incorporated by vacuum-assisted electroless plating into porous Ni/Sm0.2Ce0.8O1.9 (Ni/SDC) anodes as the active anodes for the oxidation reaction of hydrogen and methane of intermediate temperature solid oxide fuel cells (IT-SOFCs). The scanning electron microscopy (SEM) observation indicates the formation of a uniformly distributed nano-stru...
The electrolyte materials Ce0.85Sm0.15O1.925–x at.% FeO1.5 (x=0, 0.5, 1, 2, 3) were synthesized by means of glycine–nitrate process (GNP). Their structures and ionic conductivities were characterized by X-ray diffraction, SEM and AC impedance spectroscopy. All the electrolytes were found to be ceria-based solid solutions of fluorite type structures...
The iron-sulfur world (ISW) theory is an intriguing prediction regarding the origin of life on early Earth. It hypothesizes that life arose as a geochemical process from inorganic starting materials on the surface of sulfide minerals in the vicinity of deep-sea hot springs. During the last two decades, many experimental studies have been carried ou...
Non-sealed solid oxide fuel cell (NS-SOFC) micro-stacks with two gas channels were fabricated and operated successfully under various CH4/O2 gas mixtures in a box-like stainless-steel chamber. The cells with an anode-facing-cathode configuration were connected in serial by zigzag sliver sheets. Each cell consisted of the Ni/yttria-stabilized zircon...
A series of compact La/O-vacant La(1-x)CoO(3-y) compounds were prepared by a cold high-pressure procedure, and their thermoelectric (TE) properties were investigated. Compared with the ion-substituted hole-type LaCoO(3) systems (e.g., La(1-x)Sr(x)CoO(3)), the thermal conduction of La(1-x)CoO(3-y) is noticeably reduced by the La/O vacancies, whereas...
BaCo0.7Fe0.2Nb0.1O3−δ(BCFN)/Ce0.8Sm0.2O1.9(SDC) composite material was prepared and characterized as cathode for intermediate temperature solid oxide fuel cells. The X-ray diffraction result proved that there was no obvious reaction between the BCFN and SDC after calcination at 1000 °C for 10 h. AC impedance spectra based on La0.9Sr0.1Ga0.8Mg0.2O3−...
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In this paper, Ce0.8Sm0.2O1.9 (SDC) nanoparticles modified GdBaCo2O5+δ (GBCO) cathodes were fabricated by an infiltration technique and evaluated for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Good chemical compatibility between GBCO and infiltrated SDC was confirmed by X-ray diffraction (XRD) characterization. SDC nanoparticles (∼...
In this paper, our research results on single chamber solid oxide single cells and micro-stacks are presented. In single cell investigations, both electrolyte-supported (ES) and anode-supported (AS) cells were studied. The primary work focused on reducing the inner resistance, improving the open circuit voltage (OCV) as well as power density, and e...
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Nanosized ceria (CeO2) was introduced to the porous GdBaCo2O5+δ (GBCO) backbone by an infiltration technique. The XRD profile confirmed good chemical compatibility between GBCO and ceria nanoparticles. Impedance spectra confirmed that the incorporation of ceria obviously enhanced the cathode performance, with a polarization resistance a 0.19 Ohm cm...
Cu2O/Cu nanocomposites (NCs) with flowerlike nano-architecture were prepared using template-free stepwise solvent-thermal synthesis route with Cu(NO3)2·3H2O as a precursor. With the precursor concentration increasing gradually from 0.01 to 0.1M, the morphology of the NCs evolves from nano-flower to microsphere. The content of Cu in the NCs can be e...
The GdBaCo2O5+δ–Sm0.2Ce0.8O1.9 (GBCO–SDC) composite cathodes were prepared, their thermogravimetric measurement, thermal expansion coefficient (TEC), electrical conductivity and electrochemical performance were studied as function of temperature and SDC content. The adjustment of TEC to electrolyte, which is one of the main problems of GBCO cathode...
A right-angular configuration for the single-chamber solid oxide fuel cell (SC-SOFC) has been proposed and operated successfully in a methane–oxygen mixture (CH4:O2 = 2:1) with a total flow rate of 300 mL min−1. It was fabricated by attaching the Ni/yttria-stabilized zirconia (YSZ) anode and the Sm0.2Ce0.8O1.9-impregnated La0.7Sr0.3MnO3 (LSM) catho...
Anode microstructure has a great influence on the cell performance. The addition of urea into impregnated solution has been proposed to tailor the distribution and/or morphology of Cu when fabricating the Cu-based anodes by impregnation method. While the previous reports demonstrated the single cell performance has not been improved in this route,...
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In this study, a simple and cost-effective dry-pressing method has been used to fabricate a symmetrical solid oxide fuel cell (SOFC) where the dense yttria-stabilized zirconia (YSZ) electrolyte film is sandwiched between two symmetrical porous YSZ layers in which La0.75Sr0.25Cr0.5Mn0.5O3−δ (LSCM) based anode and cathode are incorporated using wet i...
Yttria-stabilized zirconia (YSZ) membranes were deposited onto porous NiO–YSZ anode supports by screen printing. Combined with La0.7Sr0.3MnO3–YSZ composite cathode, the prepared anode-supported solid oxide fuel cells (SOFCs) were electrochemically tested. A typical SOFC with a 30-μm-thick YSZ electrolyte membrane gave the maximum power densities (M...
The thermal transport properties of a series of electron-doped CaMnO3 perovskites have been investigated. Throughout the temperature range 5–300K, phonon thermal conductivity is dominant, and both electron and spin wave contributions are negligible. The short phonon mean free paths in this system result in the relatively low thermal conductivities....
Ce0.85Sm0.15O1.925 samples have been prepared using the glycine-nitrate process. The effects of microstructure on their electrical properties were investigated by X-ray diffraction, density measurements, scanning electron microscopy and AC impedance spectroscopy. The grain-boundary conductivities and total conductivities increase with decreasing gr...
A series of electron-doped orthorhombic-perovskite manganites Ca0.9R0.1MnO3 (R = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Yb) are synthesized for a systematic study of their crystal structure and magnetic properties. The structural distortions, in terms of the average Mn–O–Mn bond angle θMn–O–Mn and Mn–O bond length dMn–O, are characterized as a...
The perovskite oxides La0.875−xEuxNa0.125CrO3 were prepared at 1200 °C by solid state reaction. XRD, XPS and 151Eu Mossbauer spectra measurements show that the structures are orthorhombic and their lattice distortion degree increases with x. Cr ions are in mixed valence of +3 and +6. With x increasing, the amount of Cr6+ becomes larger. The covalen...
Transport and thermoelectric (TE) properties have been investigated for the ( Ca , Dy ) MnO <sub>3</sub>–( Ca , Yb ) MnO <sub>3</sub> solid solutions. Resistivity is found to be closely correlated with the structural distortions in this system. The enhanced TE efficiency in the solid solutions can be well attributed to the distortion of electronic...
Thermoelectric and thermodynamic properties of a series of Ca-site rare-earth R3+ doped Ca3Co4O9 were investigated. For a fixed doping level, with the reduction in R3+ radius, thermopower is found to gradually increase despite the carrier concentration remains unchanged. The scaling behavior between thermopower and electron specific heat coefficien...
An unusual thermoelectric response was observed in n-type perovskite oxide La(1-x)Ce(x)CoO(3). Combining transport and magnetic measurements, we found that the thermoelectric response is driven by the spin-state transition of Co(3+). This transition destroys the spin blockade effect and induces an abrupt decrease of resistivity as well as an insula...
A single chamber solid oxide fuel cell (SC-SOFC) micro-stack with three series-wound cells has been prepared and operated in methane–oxygen–nitrogen mixture. A maximum power output of 282 mW was generated at the furnace temperature of 800 °C. A mutual effect was found among the three cells. Cell 2 between Cell 1 and Cell 3 produced a maximum power...
IntroductionExperimentalResults and DiscussionsConclusion
Footnotes
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In this study, an anode-supported solid oxide fuel cell (SOFC) has been prepared using a porous yttria-stabilized zirconia (YSZ) anode matrix. The anode was prepared by impregnating the sintered porous YSZ matrix with a nitrate aqueous containing La3+, Sr2+, Cr3+, Fe3+, Ni2+ and urea. The formed anode exhibited high surface area and porosity, and h...
An annular micro-stack array consisting of four fuel cells has been fabricated and operated successfully in single-chamber conditions using a nitrogen-diluted oxygen–methane mixture as the operating gas. The single cells consist of a state-of-the-art porous NiO/Y2O3-stabilized ZrO2 (YSZ) anode support, a YSZ electrolyte membrane and a modified La0....
PrBaCo2O5+δ–Ce0.8Sm0.2O1.9 (PBCO–SDC) composite material are prepared and characterized as cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The powder X-ray diffraction result proves that there are no obvious reaction between the PBCO and SDC after calcination at 1100 °C for 3 h. AC impedance spectra based on SDC electrolyte...
Two different silica sources have been used for the preparation of Ni0.5Zn0.5Fe2O4/SiO2 nanocomposites, and their effects on the particle size, crystallinity and the magnetic properties have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and physical property measurement system (PPMS). In both cases, Ni0.5Zn0.5...
The high-temperature transport and thermoelectric characteristics of Ca3−x
Y
x
Co4O9 (x=0–0.75) series were studied up to 1000 K. The results reveal that the substitution of Y3+ for Ca2+ not only increases resistivity but also gradually alters the transport mechanism. The localization of carriers narrows bandwidth,
which induces the evolution of th...
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La0.75Sr0.25Cr0.5Mn0.5O3−δ (LSCrM)-impregnated anodes have been fabricated by infiltrating 70% porous yttria-stabilized zirconia (YSZ) matrixes with an LSCrM solution. In these anodes, LSCrM is a primary electronic conducive phase while the well-sintered YSZ provides an ionic-conducting pathway throughout the electrode. The maximum power densities...
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In this paper, La0.75Sr0.25Cr0.5Mn0.5O3−δ (LSCrM) and Ni impregnated porous yttria-stabilized zirconia (YSZ) anodes have been fabricated in two different ways. The testing results demonstrated the excellent performance of the anode made by infiltrating a mixture of LSCrM and Ni(NO3)2 solutions into porous YSZ matrix. After reduction of the anode wi...
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Layered GdBaCo2 −x NixO5 + δ (0 ≤ x ≤ 0.3) complex oxides were synthesized and investigated as cathodes for intermediate-temperature solid oxide fuel cell (IT-SOFCs). All compositions formed an orthorhombic double-perovskite structure after calcination at 1000 °C for 5 h. The thermal expansion coefficient (TEC) was effectively decreased due to the...
We succeeded in the synthesis of single-phase beta-SiC nanoparticles via simple and low-cost high-energy mechanical ball milling of a silicon and graphite mixture at ambient temperature. The synthesis products were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and se...
A series of Fe, Mn, and Cu doped Ca <sub>3</sub> Co <sub>4</sub> O <sub>9+δ</sub> samples, Ca <sub>3</sub>( Co , M )<sub>4</sub> O <sub>9+δ</sub> ( M = Fe , Mn, and Cu), were fabricated by cold high-pressure compacting technique. Their thermoelectric properties were investigated from room temperature up to 1000 K. The cold high-pressure compacting...
We report the electrical, thermal, magnetic, and thermoelectric properties of Y-doped Ca3Co4O9 from 300 down to 5 K. The results indicate that with Y doping, the increase of resistivity originates from the decreases of carrier concentration and mobility, while the increase of Seebeck coefficient is caused by the reduction of carrier concentration t...
Ag-network was successfully deposited by VA-EP (vacuum assisted electroless plating) method on Pr1.6Sr0.4NiO4–YSZ cathode to form (1−x)wt% Pr1.6Sr0.4NiO4−xwt% YSZ–Ag (x=0, 10, 20, 30, 40) (abbr. PYx-Ag) composite cathode. XRD results suggested that there was a good chemical stability between Pr1.6Sr0.4NiO4 and YSZ at temperatures below 1050°C. PY20...
Detailed structures and thermoelectric (TE) properties are investigated for the perovskite La(1-x)Ca(x)CoO(3) and La(1-x)Sr(x)CoO(3) with 0 <or= x <or= 0.3. The monoclinic crystal structures for all samples are refined from powder X-ray diffraction, which reveals that the La(1-x)Sr(x)CoO(3) series has smaller global distortions but larger local dis...
We report the strongly correlated, electrical transport, magnetic, and thermoelectric properties of a series of Fe, Mn, and Cu doped Ca3Co4O9. The results indicate that Fe/Mn substitutes for Co in CoO2 layers whereas Cu substitutes for Co in Ca2CoO3 layers. Because of the different doping sites, the electronic correlations increase remarkably in Fe...
A nanostructured cathode is fabricated by incorporating a mixed ionic and electronic conducting (MIEC) perovskite, Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), via ion impregnation into the most common, highly electronic conducting, and structurally stable La0.8Sr0.2MnO3-delta (LSM) porous cathode skeleton. The introduction of nanosized MIEC BSCF particles...
A configuration for the coplanar, single-chamber solid oxide fuel cell has been proposed and operated successfully in a methane-oxygen mixture (CH(4):O(2)=2:1) with a total flow of 300 mL min(-1). It was fabricated by attaching the Ni/yttria-stabilized zirconia (YSZ) anode and the Sm(0.2)Ce(0.8)O(1.9)-impregnated La(0.7)Sr(0.3)MnO(3) cathode in two...
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An aqueous impregnation method has been developed to incorporate , NiO, and Sm-doped phases into a presintered porous yttria-stabilized zirconia (YSZ) anode matrix to form an effective composite anode, in which the well-sintered YSZ provides a highly connected ion-conducing pathway while a small amount of Ni and SDC acts as catalyst. A single cell...
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In the present study, the performances of a single solid oxide fuel cell (SOFC) and a micro-SOFC stack fueled with flame of combusting liquefied petroleum gas (LPG) were studied. La0.75Sr0.25Cr0.5Mn0.5O3-delta and Ni coimpregnated yttria-stabilized zirconia were used as the anode material of the direct-flame SOFC. The operation temperature of the c...
The Ni–Zn ferrite/SiO2 nanocomposites (ZNF/SiO2 NCs) with core-shell structure were synthesized using Stöber method and a modified one. The core-shell structure was confirmed by transmission electron spectroscopy (TEM). The product obtained by modified Stöber method was more uniform than by Stöber method. The strength of dipole–dipole interaction b...
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In this paper, perovskite oxide La0.75 Sr0.25 Cr 0.5 Mn0.5 O3-δ (LSCM) mixed with a small fraction Ni has been used as the anode of single-chamber solid oxide fuel cell(s) operating in a methane-oxygen mixture. The anode is prepared by an ion impregnation method, whereby a proper mixed solution with metal nitrates and urea is incorporated into the...
Combining transport and magnetic properties measurements, we find that ferromagnetic clusters are embedded in an antiferromagnetic matrix in the mix-valent R1−xCaxMnO3 (R denotes rare-earth element, x = 0.88−1) manganites at low temperature, namely, magnetic phase separation phenomenon. In contrast to the hole-doped manganites, ferromagnetic cluste...
Polycrystalline La2NiMnO6 compounds were fabricated at different temperatures and their magnetic properties were investigated. Although the antiferromagnetic antisite disorder degree changes a little, the antiferromagnetic coupling intensity increases with increasing synthesized temperature. When La2NiMnO6 sample was cooled at 100 Oe from room temp...
We report a systematical investigation on the high temperature thermoelectric response of Ca1−xRxMnO3 (R = rare-earth) perovskites in the electron-doped range. The results reveal that electron concentration is the dominant factor for the high temperature electrical transport properties whereas the weight and size of R ions dominate the thermal tran...
A novel design of single chamber solid oxide fuel cell (SC-SOFC) microstack with cell-array arrangement is fabricated and operated successfully in a methane–oxygen–nitrogen mixture. The small stack, consisting of five anode-supported single cells connected in series, exhibits an open circuit voltage (OCV) of 4.74 V at the furnace temperature of 600...
In this study, Ba0.5Sr0.5Zn0.2Fe0.8O3-δ(BSZF) oxide, synthesized by solid-state reaction method, was modified for the cathode of solid oxide fuel cells. Three kinds of BSZF-based cathodes, pure-BSZF, BSZF-GDC (30wt.%Ce0.9Gd0.1O1.95) and BSZF-GDC-Ag, were investigated using AC impedance spectroscopy. The results demonstrated the performance of BSZF-...
Single cell and short stacks supported with electrolyte were prepared and operated under single chamber solid oxide fuel cell (SC-SOFC) condition. The single cell was tested to investigate the ratio of fuel and oxygen in the mixture working gas as well as the operating temperature. Then single electrolyte pellet-supported SC-SOFC stacks with 2 or 3...
In this study, Ba0.5Sr0.5Zn0.2Fe0.8O 3-δ (BSZF) oxide, synthesized by solid-state reaction method, was modified for the cathode of solid oxide fuel cells. Three kinds of BSZF-based cathodes, pure-BSZF, BSZF-GDC (30wt.%Ce0.9Gd0.1O1.95) and BSZF-GDC-Ag, were investigated using AC impedance spectroscopy. The results demonstrated the performance of BSZ...
Cu2O/Cu nanocomposites (NCs) are synthesized using a two-step hydrothermal method, their different phase compositions are obtained
by adjusting the reaction time, and then, they are used as photocatalysts to degrade dye Procion Red MX-5B (PR), methylene
blue (MB) and methyl orange (MO) under visible-light. Experimental results indicate Cu2O/Cu NCs...
Single-phase polycrystalline perovskites Pr0.75Na0.25Mn1−xFexO3 (0 ≤ x ≤ 0.30) were prepared by a sol–gel technique, which can reduce the volatilization of Na, and avoid the precipitation of manganese oxide. The effects of Fe doping at the Mn site upon the charge and the magnetic order in Pr0.75Na0.25MnO3 have been investigated combining magnetic a...
Impedance spectroscopy was used to study the electrochemical performance of pure and ion-impregnated La0.7Sr0.3MnO3 (LSM) cathodes on YSZ (Y2O3-stabilized ZrO2) electrolytes in single chamber fuel cell conditions, i.e. a mixture gas with oxygen as oxidant, methane as fuel and nitrogen as dilute gas. Measurements were taken at the furnace temperatur...