Synergistic effects of Ni1-xCox-YSZ and Ni1-xCux-YSZ alloyed cermet SOFC anodes for oxidation of hydrogen and methane fuels containing H2S

被引:78
作者
Grgicak, Catherine M. [1 ]
Pakulska, Malgosia M. [1 ]
O'Brien, Julie S. [1 ]
Giorgi, Javier B. [1 ]
机构
[1] Univ Ottawa, Ctr Catalysis Res & Innovat, Dept Chem, Ottawa, ON K1N 6N5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
solid oxide fuel cell; anodes; nickel-cobalt sulfide; nickel-copper sulfide; sulfur tolerance; methane oxidation;
D O I
10.1016/j.jpowsour.2008.05.002
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
Preparation and performance of bimetallic Ni1-xCox-YSZ and Ni1-xCux-YSZ anodes were tested to overcome common deficiencies of carbon and Sulfur poisoning in SOFCs. Ni1-xCoxO-YSZ and Ni(1-x)CuxO-YSZ precursors were synthesized via co-precipitation of their respective chlorides. Single cell solid oxide fuel cells of these bimetallic anodes were tested ill H-2, CH4, and H2S/CH4 fuel mixtures. Addition Of Cu2+ into the NiO lattice resulted in large metal particle sizes and decreased SOFC performance. Addition of Co2+ into the NiO lattice to form Ni0.92Co0.08O-YSZ anode precursor produced a cermet with a large BET Surface area and active metal Surface area, thus increasing the rate of hydrogen oxidation for this sample. The performance of both bimetallics was found to quickly degrade in dry CH4 Clue to carbon deposition and lifting of the anode from the electrolyte. However, Ni0.69Co0.31-YSZ showed superior activity in a 10% (v/v) H2S/CH4 fuel mixture, Surpassing performance with H-2 fuel, thereby demonstrating the exciting prospect of using sulfidated Ni(1-x)Cox-YSZ as SOFC anodes in sulfur containing methane streams. The active anode becomes a sulfidated alloy (Ni-Co-S) under operating conditions. This anode showed enhanced performance, which surpassed those of sulfidated Ni and Co anodes, thereby Suggesting a synergistic behaviour in the Ni-Co-S anode. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:26 / 33
页数:8
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