Showing papers by "Zongping Shao published in 2006"
TL;DR: In this paper, a series of nano-structured conducting functional composite oxides were synthesized through a non-ion selective EDTA-citrate-metal complexing process, which is characterized of solution-based, insensitive to environmental parameters, such as pH and humidity, and capable of synthesis of powder in large scale.
120 citations
TL;DR: In this paper, a single-chamber solid oxide fuel cells (SC-SOFCs) incorporating thin-film Sm_(0.15)Ce_( 0.85)O_(1.925) (SDC) as the electrolyte, thick Ni + SDC as the (supporting) anode and SDC + BSCF (Ba_(0., 0.5)Sr-, 0.8)Fe_(0, 3−δ)) as the cathode) were operated in a mixture of methane, oxygen and helium at furnace temperatures
95 citations
TL;DR: In this article, a setf-supported asymmetric hollow-fiber membranes of mixed oxygen-ionic and electronic conducting perovskite Ba 0.5Sr0.5Co 0.8Fe0.2O3-delta (BSCF) were prepared by a combined phase-inversion and sintering technique.
Abstract: Setf-supported asymmetric hollow-fiber membranes of mixed oxygen-ionic and electronic conducting perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) were prepared by a combined phase-inversion and sintering technique. The starting inorganic powder was synthesized by combined EDTA-citrate complexing process followed by thermal treatment at 600 degrees C. The powder was dispersed in a polymer solution and then extruded into hollow-fiber precursors through a spinneret. ne fiber precursors were sintered at elevated temperatures to form gastight membranes, which were characterized by SEM and gas permeation tests. Performance of the hollow fibers in air separation was both experimentally and theoretically studied at various conditions. The results reveal that the oxygen permeation process was controlled by the slow oxygen surface exchange kinetics under the investigated conditions. The porous inner surface of the prepared perovskite hollow-fiber membranes considerably favored the oxygen permeation. The maximum oxygen flux measured was 0.031 mol-m(-2).s(-1) at 950 degrees C with the sweep gas flow rate of 0.522 mol(.)m(-2).s(-1). To improve the oxygen flux of BSCF perovskite membranes, future work should be focused on surface modification rather than reduction of the membrane thickness. (c) 2006 American Institute of Chemical Engineers.
94 citations
TL;DR: In this paper, the authors developed a quantitative understanding of the physical processes responsible for single-chamber fuel cells performance and developed an experimentally validated, physically-based numerical model to allow more rational design and optimization of SCFCs.
66 citations
TL;DR: In this article, a modified phase inversion process was used to obtain a self-supported asymmetric substrate with a very thin densified perovskite layer for mixed conduction, and surface modification was carried out by the attachment of Pt particles on the surface of the hollow fiber.
44 citations
Journal Article•
TL;DR: In this article, a nano-sized Ba0.2O3-delta (BSCF) oxide was obtained by modifying the solid precursor from the complexing process with concentrated nitric acid treatment.
4 citations