Deactivation of ceria-based SOFC anodes in methanol

被引:53
作者
Kim, Taeyoon [1 ]
Ahn, Kipyung [1 ]
Vohs, John M. [1 ]
Gorte, Raymond J. [1 ]
机构
[1] Univ Penn, Dept Chem & Biomol Engn, Philadelphia, PA 19104 USA
关键词
methanol; solid oxide fuel cells; ceria; deactivation;
D O I
10.1016/j.jpowsour.2006.09.101
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The performance and stability of Cu-ceria-YSZ (yttria-stabilized zirconia) and carbon-ceria-YSZ, solid-oxide-fuel-cell (SOFC) anodes were examined in neat (100%) methanol at 973 K and compared to the performance of the same anodes in dry H-2. The presence of Cu catalyzed the decomposition of methanol, so that the initial performance of cells with Cu-ceria-YSZ anodes was similar to CO and H2. However, with carbon-ceria-YSZ anodes, the open-circuit voltage was significantly higher and the reaction over-potential significantly lower in methanol than in H2, suggesting that methanol is a more effective reductant of the anode three-phase boundary region. Carbon-ceria-YSZ anodes were found to undergo rapid and irreversible deactivation in methanol. Steady-state rates of methanol decomposition over ceria-YSZ were found to undergo a similar deactivation as the carbon-ceria anodes. Although no evidence for carbon deposition was observed with methanol at 973 K, the addition of steam was found to partially stabilize both anode and catalyst performance. Scanning electron microscopy (SEM) of ceria particles in YSZ showed a large change in the morphology of the ceria particles when the samples were heated in methanol, while negligible changes were observed when heating in H-2. It is suggested that the results with methanol can be explained as resulting from the very low P(O-2) that is effectively produced by having methanol in contact with ceria. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:42 / 48
页数:7
相关论文
共 40 条
[1]   Enhanced thermal stability of SOFC anodes made with CeO2-ZrO2 solutions [J].
Ahn, KY ;
He, HP ;
Vohs, JM ;
Gorte, RJ .
ELECTROCHEMICAL AND SOLID STATE LETTERS, 2005, 8 (08) :A414-A417
[2]   Recent advances in materials for fuel cells [J].
Brandon, NP ;
Skinner, S ;
Steele, BCH .
ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :183-213
[3]   Methanol as a direct fuel in intermediate temperature (500-600 °C) solid oxide fuel cells with copper based anodes [J].
Brett, DJL ;
Atkinson, A ;
Cumming, D ;
Ramírez-Cabrera, E ;
Rudkin, R ;
Brandon, NP .
CHEMICAL ENGINEERING SCIENCE, 2005, 60 (21) :5649-5662
[4]   Studies of the water-gas-shift reaction on ceria-supported Pt, Pd, and Rh: implications for oxygen-storage properties [J].
Bunluesin, T ;
Gorte, RJ ;
Graham, GW .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 15 (1-2) :107-114
[5]   CO oxidation for the characterization of reducibility in oxygen storage components of three-way automotive catalysts [J].
Bunluesin, T ;
Gorte, RJ ;
Graham, GW .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 14 (1-2) :105-115
[6]   Defect and transport properties of nanocrystalline CeO2-x [J].
Chiang, YM ;
Lavik, EB ;
Kosacki, I ;
Tuller, HL ;
Ying, JY .
APPLIED PHYSICS LETTERS, 1996, 69 (02) :185-187
[7]   Effect of ceria structure on oxygen migration for Rh/ceria catalysts [J].
Cordatos, H ;
Bunluesin, T ;
Stubenrauch, J ;
Vohs, JM ;
Gorte, RJ .
JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (02) :785-789
[8]   Structure and thermal stability of ceria films supported on YSZ(100) and α-Al2O3(0001) [J].
Costa-Nunes, O ;
Ferrizz, RM ;
Gorte, RJ ;
Vohs, JM .
SURFACE SCIENCE, 2005, 592 (1-3) :8-17
[9]   High mobility of ceria films on zirconia at moderate temperatures [J].
Costa-Nunes, O ;
Gorte, RJ ;
Vohs, JM .
JOURNAL OF MATERIALS CHEMISTRY, 2005, 15 (15) :1520-1522
[10]   Comparison of the performance of Cu-CeO2-YSZ and Ni-YSZ composite SOFC anodes with H2, CO, and syngas [J].
Costa-Nunes, O ;
Gorte, RJ ;
Vohs, JM .
JOURNAL OF POWER SOURCES, 2005, 141 (02) :241-249