In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2016-01, No. 1 ( 2016-04-01), p. 185-185
Abstract:
Liquid Sb has been accepted for direct carbon solid oxide fuel cell anode material for its unique physical and chemical properties. Sb and Sb 2 O 3 have a relatively low melting point of 630 and 636 °C respectively and the electrochemical formed Sb 2 O 3 would drift away from the Sb/electrolyte interface because of density difference. So the density difference and viscosity of the liquid phases have influence on the two phase convection and the average thickness of insulator Sb 2 O 3 layer. Sb 1- x -Ag x ( x = 0.1, 0.2, 0.3) alloy has a lower melting point and higher density than pure Sb. Since Ag 2 O would not exist stably at temperature higher than 300 °C, Ag atoms in the Sb 1- x Ag x anode will not participate to the electrochemical reaction with O 2- at intermediate temperature. A tubular 8 mol.% Y 2 O 3 stabilized ZrO 2 (YSZ) supported SOFC with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 -Gd 0.1 Ce 0.9 O 2-δ (LSCF-10GDC) as the cathode and Sb 1- x -Ag x as anode was fabricated by slurry-casting, slurry-dipping and sintering processes. The primary I-V/I-P performance of the Sb 1- x -Ag x abode cells was much lower than the Sb anode cell. Alloying Ag seemed to have a negative influence on the electrochemical reaction between Sb and O 2- , which might due to Ag atoms taking partial Sb atoms positions. Working at a current density from 0.1, 0.2, 0.3, 0.4 to 0.5 A cm -2 at 750 °C, the final I-V/I-P performance of the alloy anodes cells was just a little lower than the Sb anode cell. The EDX analysis and SEM pictures of the tested cells revealed that elements re-distribution happened in the anode. The primary uniform distributed Sb 1- x -Ag x alloy appeared to be a layered structure and the Ag content in the button layer was higher than that in the upper layer. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2016-01/1/185
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2016
detail.hit.zdb_id:
2438749-6
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