Investigation into the effect of molybdenum-site substitution on the performance of Sr2Fe1.5Mo<sub>0.5O6-δ for intermediate temperature solid oxide fuel cells

In this paper, niobium doping is evaluated as a means of enhancing the electrochemical performance of a Sr₂Fe_1.5Mo<sub>0.5O_6-δ (SFM) perovskite structure cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs) applications. As the radius of Nb approximates that of Mo and exhibits +4/+5 mixed valences, its substitution is expected to improve material performance. A series of Sr₂Fe_1.5Mo<sub>0.5-xNb_xO_6-δ (x = 0.05, 0.10, 0.15, 0.20) cathode materials are prepared and the phase structure, chemical compatibility, microstructure, electrical conductivity, polarization resistance and power generation are systematically characterized. Among the series of samples, Sr₂Fe_1.5Mo<sub>0.4Nb_0.10O_6-δ (SFMNb_0.10) exhibits the highest conductivity value of 30 S cm^-1 at 550°C, and the lowest area specific resistance of 0.068 Ω cm² at 800°C. Furthermore, an anode-supported single cell incorporating a SFMNb_0.10 cathode presents a maximum power density of 1102 mW cm^-2 at 800°C. Furthermore no obvious performance degradation is observed over 15 h at 750°C with wet H₂(3% H₂O) as fuel and ambient air as the oxidant. These results demonstrate that SFMNb shows great promise as a novel cathode material for IT-SOFCs.

Investigation into the effect of Fe-site substitution on the performance of Sr2Fe1.5Mo<sub>0.5O6-δ anodes for SOFCs

Ni-substituted Sr₂Fe_1.5-xNi_xMo<sub>0.5O_6-δ (SFNM) materials have been investigated as anode catalysts for intermediate temperature solid oxide fuel cells. Reduced samples (x = 0.05 and 0.1) maintained the initial perovskite structure after reduction in H₂, while metallic nickel particles were detected on the grain surface for x = 0.2 and 0.3 using transmission electron microscopy. Temperature programmed reduction results indicate that the stable temperature for SFNM samples under reduction conditions decreases with Ni content. In addition, X-ray photoelectron spectroscopy analysis suggests that the incorporation of Ni affects the conductivity of SFNM through changing the ratios of Fe³⁺/Fe²⁺ and Mo<sup>6+/Mo<sup>5+. Sr₂Fe_1.4Ni_0.1Mo<sub>0.5O_6-δ shows the highest electrical conductivity of 20.6 S cm^-1 at 800 °C in H₂. The performance of this anode was further tested with electrolyte-supported cells, giving 380 mW cm^-2 at 750 °C in H₂, hence demonstrating that Ni doping in the B-site is beneficial for Sr₂Fe_1.5Mo<sub>0.5O_6-δ anode performance. 

MO-FG-BRA-06: Material Optimisation for Nanoparticle-Sensitized Radiotherapy

Russia will brush off Litvinenko accusations – and there is little that can be done about it

The Litvinenko findings bring forth the dilemmas for the British government it hoped it could bury: how to reconcile moral principles with hardcore realities of international politics and economics.

O ladrão da mão-cortada: análise comparada de um corpus ibérico do conto tipo-AT 956 B

Este artigo é um estudo comparativo do conto AT 956 B (The Clever Maiden Alone at Home Kills the Robbers), centrado na análise de versões portuguesas e espanholas, embora recorrendo a outras tradições europeias e do Norte de África. O objectivo final da análise é estabelecer uma matriz da estrutura deste conto-tipo tal como ele aparece em Portugal, na sua relação com outras tradições próximas. As versões são analizadas tendo em linha de conta os seus aspectos narrativos, simbólicos e etno-sociológicos.

Bull Creek/May River PSG-R-008

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Bull Creek/May River PSG-R-008 Recreational Shellfish Ground in Beaufort County.

Station Creek PSG - R089

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Station Creek PSG - R089 Recreational Shellfish Ground in Beaufort County.

Leadenwah Creek PSG - R173, R174, R181

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Leadenwah Creek PSG - R173, R174, R181 Recreational Shellfish Ground in Charleston County.

Leadenwah Creek PSG - R175

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Leadenwah Creek PSG - R175 Recreational Shellfish Ground in Charleston County.

Green Creek PSG - R193

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Green Creek PSG - R193 Recreational Shellfish Ground in Charleston County.

Hamlin Creek PSG - R252

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Hamlin Creek PSG - R252 Recreational Shellfish Ground in Charleston County.

Hamlin Creek PSG - R252

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Hamlin Creek PSG - R252 Recreational Shellfish Ground in Charleston County.

Long Creek PSG - R292

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Long Creek PSG - R292 Recreational Shellfish Ground in Charleston County.

Eden Saltworks Creek S392

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Eden Saltworks Creek S392 Recreational Shellfish Ground in Horry County.

Bull Creek S007

The South Carolina Department of Natural Resources provides maps to recreational and state shellfish grounds, available to the public for recreational harvesting or to commercial harvest. This map shows the location of Bull Creek S007 Recreational Shellfish Ground in Beaufort County.