Prevention of SOFC cathode degradation in contact with Cr-containing alloy

Degradation of (La0.6Sr0.4)0.95(Co0.2Fe0.8)O3−δ Solid Oxide Fuel Cell Cathodes at the Nanometer Scale and below

“…Although one approach to mitigate Cr poisoning is to develop interconnect coatings that can reduce Cr evaporation, it has been shown to be very difficult to eliminate the Cr evaporation completely 70 and a very small amount of Cr contamination (0.1%) can significantly poison the electrode 5 . The development of a more Cr poisoning resistant electrode material is therefore necessary, which requires the identification and understanding of all effective poisoning mechanisms.…”

Effect of cathode and electrolyte transport properties on chromium poisoning in solid oxide fuel cells

“…The chromium transport occurs primarily through the formation of Cr 6+ -containing species, such as CrO 3 or CrO 2 (OH) 2 , from oxidation of chromium oxide in the interconnect [9][10][11][12][13][14][15][16][17]. Chromium poisoning has been observed in chromium-based [18,19], nickel-based [20][21][22][23] and iron-based [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] interconnect alloys, so that one of the objectives in the design of new alloys for SOFC interconnects is to reduce scale volatilization. One alloying addition used to reduce volatilization is manganese, which is incorporated in the oxide scale and leads to the formation of a (Mn,Cr) 3 O 4 spinel layer on the scale surface.…”

“…Chromium poisoning is generally associated with cathodic polarization and thus has been attributed to electrochemical reduction of the chromium-containing gas species to form Cr 2 O 3 on the cathode [18][19][20][21][22][23][24][25][26][27][28][29][30] by either,…”

Oxidation and Electrical Behavior of a Ferritic Stainless Steel with a Mn–Co-Based Coating for SOFC Interconnect Applications

“…To improve scale conductivity and solve the problem of Cr poisoning, several alloys, including Crofer 22 APU [8] and ZMG232 [9], have been developed in the past few years for SOFC interconnect application. These alloys contain a small amount of Mn that results in the formation of a dual layer scale consisting of a (Mn,Cr) 3 O 4 top layer and chromia sublayer [10][11][12][13].…”