in this study the characteristics of two different kinds of la0.6sr0.4co0.2fe0.8o3 (lscf) powders, one in-house synthesized powder by a co-precipitation method and another one purchased from fuel cell materials co. (fcm co., usa), were compared. the co-precipitated powder was prepared by using ammonium carbonate as precipitant with a nh4+/no3- molar ratio of 2 and calcination at 1000c for 1 h....

Introduction: The direct use of CH4 as the feed to the solid oxide fuel cell (SOFC) will allow elimination of a reformer, simplifying the SOFC system and decreasing the system cost [1]. The overall reaction on the anode catalyst in the direct CH4 SOFC is the electrochemical oxidation of CH4: CH4 + 4O CO2 + 2H2O + 8e. Due to the nature of hydrocarbon reactions at high temperature and the reducin...

SERS provided by sputtered silver was employed to detect trace amounts of chemical species on SOFC electrodes. Considerable enhancement of Raman signal and lowered detection threshold were shown for coked nickel surfaces, CeO(2) coatings, and cathode materials (LSM and LSCF), suggesting a viable approach to probing electrode degradation and surface catalytic mechanism.

The surface properties of La0.6Sr0.4Co0.2Fe0.8O3-? (LSCF) perovskite electrode are modified with HNO3 treatment to improve its catalytic activity towards oxygen reduction reaction between 500–650 °C. concentrations A-site cations reduced after the acid etching. After calcination at 1150 °C, severe segregation Sr is observed on untreated LSCF powder, which suppressed remarkably pretreatment. Hig...

The effects of the electrochemical oxygen reduction reaction (ORR) on surface single-phase perovskite cathodes are well understood, but its potential for use in a complex system consisting different material types is unexplored. Herein, we report how BaCO3 nanoparticles-modified La0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.2Ce0.8O2-δ (LSCF–GDC)-composite improved kinetics high-performing ceramic fuel cells. Bo...

In this work, the electrocatalytic properties of novel cathodes prepared by infiltration NdBa 0.9 Co 2 O 5+ ? (NBC) into porous Gd doped Ceria (GDC) scaffolds are investigated, and comparison is provided with La 0.6 Sr 0.4 0.2 Fe 0.8 3? (LSCF) infiltrated GDC cathodes. For both formulations, symmetric cells fabricated blade coating aqueous nitrate precursor solutions until reaching 25% w/w load...

Two numerical models have been developed to simulate the Cyclic Voltammetry (CV) response of Lanthanum Strontium Cobalt Ferrite (LSCF) porous electrode at high temperature. The first one (model-I) takes into account solid-state diffusion in LSCF coupled with a global reaction oxygen exchange while second (model-II) is based on detailed elementary description mechanism. relevance model-II predic...

This communication reports on the design, fabrication and testing of special high temperature Si/SiN based micro-hotplates as micromachined platforms for micro-SOFCs. Different designs and materials have been evaluated to realise micro-heating platforms compatible with spray pyrolysed anode, cathode and electrolytes materials. The potential of these micromachined platforms for further integrati...

Fracture toughness of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) in both bulk and film forms after sintering at 900°C to 1200°C was measured using both single-edge V-notched beam (SEVNB) 3-point bending and Berkovich indentation. FIB/SEM slice-and-view observation after indentation revealed the presence of Palmqvist radial crack systems after indentation of the bulk materials. Based on crack length measur...