Showing papers by "Zongping Shao published in 2008"
TL;DR: In this article, a stable, cation-ordered oxides with layered lattice structures were obtained with medium-sized Ln 3+ ions over a wide range of oxygen partial pressures, a property essential for applications as oxygen separation membranes and solid oxide fuel cell cathodes.
446 citations
TL;DR: A-site cation deficiency resulted in a steady increase in cathode polarization resistance, because impurities formed at the cathode/electrolyte interface, reducing the electronic conductivity.
215 citations
TL;DR: In this paper, the potential application of Ba0.9Y0.1O2.5Sr0.5Co0.8Fe0.2O3−i (BSCF) as a cathode for a proton-conducting solid- oxide fuel cell based on BaCe0.95 electrolyte was investigated.
152 citations
TL;DR: In this paper, the influence of Sc 3+ doping in the B-site of SrCoO 3− δ on its lattice structure/phase stability, electrical conductivity, and cathode performance for intermediate-temperature solid oxide fuel cells (IT-SOFCs) was investigated by X-ray diffraction, four-probe dc conductivity and impedance spectroscopy measurements, respectively.
140 citations
TL;DR: A novel SrNb( 0.1)Co(0.9)O(3-delta) electrode material, which possesses not only high electrical conductivity but also large oxygen vacancy concentration at 400-600 degrees C, shows an excellent performance in the application of reduced temperature solid-oxide fuel cells.
126 citations
TL;DR: In this article, the crystal structure, phase stability, oxygen nonstoichiometry, electrical conductivity, and oxygen permeability of the oxides were systematically investigated, and it was shown that the oxygen permeation process was mainly rate-limited by the oxygen bulk diffusion process.
116 citations
TL;DR: In this paper, the A-site cation excess in BSCF(I + x) resulted in a lattice expansion and the creation of more active sites for oxygen reduction reaction due to the lowered valence states of the B-site ions and the increased oxygen vacancy concentration, which improved the oxygen adsorption process.
115 citations
TL;DR: In this article, the SrSc0.8O3-delta (SSC) perovskite was investigated as a cathode material for low temperature solid-oxide fuel cell.
100 citations
TL;DR: In this article, the properties and performance of Ba05Sr05Co08Fe02O3-delta (PSCF)+Sm02Ce08O19 (SDC) composite cathode for intermediate-temperature solid-oxide fuel cells were investigated.
92 citations
TL;DR: In this paper, a modified Ba0.5Sr 0.5Co0.8Fe0.2O3−δ (BSCF) cathode for intermediate-temperature solidoxide fuel cells (IT-SOFCs) was prepared by an electroless deposition process using N2H4 as the reducing agent at room temperature.
83 citations
TL;DR: In this article, a facile autocombustion process based on a modified glycine-nitrate process (GNP) using cellulose fiber as micro-reactor was used to synthesize nanocrystallized La0.6Sr0.8O3−δ oxide powder.
Abstract: Nanostructured La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) oxide powder was synthesized by a facile autocombustion process based on a modified glycine-nitrate process (GNP) using cellulose fiber as micro-reactor. As compared with the normal GNP, this novel process allows the combustion to proceed in a much more environmentally friendly and controllable way. The resulted powder is nanocrystallized with particle size of only 15–20 nm as observed by transmission electron microscopy examination. More importantly, because the metal ions could disperse homogenously in cellulose–GN precursor, SrCO3 impurity was effectively suppressed. The concentrations of SrCO3 impurity in LSCF products were determined by carbon dioxide–temperature-programmed desorption technique, which decreased to as low as 1.3 wt% from cellulose–GN process, in contrast to 4.3 wt% from the normal GNP. These features resulted in the attractive improvement of its cathode performance in solid-oxide fuel cells (SOFCs). The interfacial resistances of only ∼0.70 and ∼0.36 Ω·cm2 at 600° and 650°C under air, respectively, were observed, which was about two times better than the LSCF cathode derived from the normal GNP. A peak power density of ∼346 mW/cm2 was achieved at 600°C with cellulose–GN-derived LSCF cathode based on thin-film Sm0.2Ce0.8O1.9 electrolyte SOFC using 3% humidified H2 as the fuel.
TL;DR: In this article, a direct-spraying deposition method that is using ethylene-glycol (EG) soaked Nafion membrane and the catalyst ink with isopropyl alcohol as the primary liquid media and small amount of EG as additive has been developed for fabrication of high-quality CCMs.
TL;DR: In this paper, a no-chamber solid-oxide fuel cell operated on a fuel-rich ethanol flame was reported, where the location of the fuel cell with respect to the flame was found to have a significant effect on fuel cell temperature and performance.
TL;DR: In this paper, the authors investigated the long-term operational stability of a BSCF membrane with respect to oxygen separation and showed that B-site deficiency greatly restrained A-site cation diffusion and stabilized the perovskite structure and permeation properties of the membranes.
TL;DR: In this article, an alternative method for preparing catalyst for methane partial oxidation was developed, which may find application to develop composite anodes for direct hydrocarbon fuelled solid oxide fuel cells.
TL;DR: In this article, perovskite-type La0.8Sr0.2ScyMn1−yO3−δ oxides were synthesized and investigated as cathodes for solidoxide fuel cells (SOFCs) containing a stabilized zirconia electrolyte.
TL;DR: In this paper, high energy ball milling (HEBM) was applied for the synthesis of spinel Li 4 Ti 5 O 12 and the influence of milling time was investigated systematically.
TL;DR: In this article, the authors used wet powder spraying (WPS) technique for the deposition of dense and thin (Y2O3)(ZrO2)(0.92) (YSZ-8) films on an anode substrate being used for fuel cell applications.
TL;DR: In this paper, H2 production from ethanol steam reforming (ESR) was investigated over Pt catalysts supported on CexZr1−xO2 (x = 0.2, 0.4,0.6, or 0.8) developed via a glycine nitrate process.
Abstract: Hydrogen production for application to proton exchange membrane fuel cells (PEMFCs) has been a focus of investigation globally. Ethanol as a H2 source benefits from the ready availability of infrastructure and environmental benignity in comparison with those of other hydrocarbon fuels. Thus, H2 production from ethanol has gained much attention worldwide. In this work, H2 production from ethanol steam reforming (ESR) was investigated over Pt catalysts supported on CexZr1−xO2 (x = 0.2, 0.4, 0.6, or 0.8) developed via a glycine nitrate process. The supports or catalysts were characterized by low temperature N2 physical adsorption, powder X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction, temperature-programmed desorption of ethanol, and catalytic performance measurements for ESR at 350–550 °C. Initial catalyst stability was also investigated. The results indicated that Pt/CexZr1−xO2 catalysts were highly active for ESR at lower temperatures, only yielding H2...
TL;DR: Ammonia nitrate was applied as an oxidizer and combustion trigger to modify the normal combined EDTA-citrate complexing method into a process with autocombustion and low ignition temperature as discussed by the authors.
TL;DR: In this article, an anode-supported single-chamber solidoxide fuel cell, with NiO+−Sm 0.2Ce0.9 anode and Ba0.5Sr0.8O1.9 cathode, was investigated.
TL;DR: In this paper, an in situ catalytic decomposition of hydrazine at liquid state under room temperature and ambient pressure before introducing to the fuel cell was developed by applying a Ba0.5Sr 0.5Co 0.8Fe0.2O3-delta (BSCF) oxide catalyst.
TL;DR: In this paper, the results of DME partial oxidation over a 1.5 wt% Pt/Ce0.4Zr0.6O2 catalyst under the condition of gas hourly space velocity (GHSV) of 15000-60000 ml/(g·h), molar ratio of O2/DME of 0.5 and 500-700 °C, and this temperature range was also the operation temperature range for intermediate temperature SOFC.
TL;DR: In this article, nano-crystalline powders for applications in solidoxide fuel cells were synthesized by employing cotton fibers as the micro-bioreactor, which can be easily sintered to dense electrolytes at 1350 degrees C.
TL;DR: In this paper, the activation and deactivation kinetics of oxygen reduction over a novel La 0.8-dimensional domain were investigated using electrochemical impedance spectroscopy, step current polarization, and cyclic voltammetry.
Abstract: Electrochemical impedance spectroscopy, step current polarization, and cyclic voltammetry were applied to investigate the activation and deactivation kinetics of oxygen reduction over a novel La0.8...
TL;DR: In this article, the effects of sintering atmospheres on properties of mixed-conducting membranes were studied in terms of electrical conductivity and oxygen permeability, and the results showed that the properties of SCo0.4Fe0.5Zr0.1
TL;DR: In this paper, composite electrodes composed of a perovskite-type La 0.8 Sr 0.2 Sc 0.1 Mn 0.9 O 3− δ (LSSM) and a fluorite type scandium-stabilized zirconia (ScSZ) were prepared and evaluated as potential cathodes for intermediate-temperature solid-oxide fuel cells.
Journal Article•
TL;DR: In this article, a thorough review on the background and recent progress on solid-acid fuel cells is given, and the key problems for the application of SAFCs are suggested and the possible solutions are proposed.
Abstract: There is an increasing interest in a novel type of fuel cells, the solid-acid fuel cells (SAFCs), which are characterized by impermeability to fuels of the electrolyte, high electrocatalytic activity and high CO tolerance of the electrodes. This paper gives a thorough review on the background and recent progress on SAFCs. The operation principle is described in detail. The key problems for the application of SAFCs are suggested and the possible solutions are proposed.
01 Jan 2008
TL;DR: In this paper, a no-chamber solidoxide fuel cell that operated on a fuel-rich ethanol flame was reported, where the location of the fuel cell with respect to the flame was found to have a significant effect on fuel cell temperature and performance.
Abstract: A no-chamber solid-oxide fuel cell that operated on a fuel-rich ethanol flame was reported. Heat produced from the combustion of ethanol thermally sustained the fuel cell at a temperature range of 500 ∼ 830 °C. Considerable amounts of hydrogen and carbon monoxide were also produced during the fuel-rich combustion directly providing the fuels for the fuel cell. The location of the fuel cell with respect to the flame was found to have a significant effect on the fuel cell temperature and performance. The highest power density was achieved when the anode was exposed to the inner flame. By modifying the Ni+Sm0.2 Ce0.8 O1.9 (SDC) anode with a thin Ru/SDC catalytic layer, the fuel cell envisaged not only an increase of the peak power density to ∼ 200 mW/cm2 but also in a significant improvement of the anodic coking resistance.Copyright © 2008 by ASME