Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 36, Issue 9, Pages 5632-5643Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2011.01.163
Keywords
Solid oxide fuel cells; Catalyst layer; Methane; Carbon deposition; Surface conductivity
Categories
Funding
- Outstanding Young Scholar Grant at Jiangsu Province [2008023]
- program for New Century Excellent Talents
- Fok Ying Tung Education Foundation [111073]
- Development of Innovative Anode and Cathode Materials for SOFC Towards Reduced Temperature Operation, SAIT, Samsung Electronics Co., Ltd, Korea
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Different concentrations of copper are added to LiLaNi-Al2O3 to improve the electronic conductivity property for application as the materials of the anode catalyst layer for solid oxide fuel cells operating on methane. Their catalytic activity for the methane partial oxidation, steam and CO2 reforming reactions at 600-850 degrees C is systematically investigated. Among the three catalysts, the LiLaNi-Al2O3/Cu (50:50, by weight) catalyst presents the best catalytic activity. Thus, the catalytic stability, carbon deposition and surface conductivity of the LiLaNi-Al2O3/Cu catalyst are further studied in detail. O-2-TPO results indicate that the coking resistance of LiLaNi-Al2O3/Cu is satisfactory and comparable to that of LiLaNi-Al2O3. The surface conductivity tests demonstrate it is extremely improved for LiLaNi-Al2O3 catalyst due to the addition of 50 wt.% copper. A cell with LiLaNi-Al2O3/Cu (50:50) catalyst layer is operated on mixtures of methane-O-2, methane-H2O and methane-CO2, and peak power densities of 1081, 1036 and 988 mW cm(-2) are obtained at 850 degrees C, respectively, comparable to the cell with LiLaNi-Al2O3 catalyst layer. In summary, the results of the present study indicate that LiLaNi-Al2O3/Cu (50:50) catalysts are highly coking resistant and conductive catalyst layers for solid oxide fuel cells. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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