Sulphur tolerant shift reaction catalysts for nickel-based SOFC anode

Nanostructured anodes for solid oxide fuel cells

“…Since when operating with syn gas as the fuel this reaction may be the primary pathway for CO 2 oxidation, this may also cause performance degradation. He et al have recently shown that the addition of a sulfur tolerant WGS shift catalyst, such as Pd nanoparticles supported on CeO 2 , to the anode can help to alleviate this latter effect of sulfur [15].…”

Effect of substitution with Cr3+ and addition of Ni on the physical and electrochemical properties of Ce0.9Sr0.1VO3 as a H2S-active anode for solid oxide fuel cells

“…12 compares the sustainability over 15 h of galvanostatic performance of the catalysts CSCV and NCY, with fuel cell output 75 and 40 mA cm −2 , respectively. The NCY anode was less stable than CSCV under galvanostatic conditions, as can be seen by the slight increase in overpotential from −0.65 to −0.6 V. This was most likely a consequence of one of two processes: sintering of the Ni particles, and poisoning of Ni sites by H 2 S. Both processes are known to occur in SOFC systems containing Ni [9][10][11][12][13][14][15][16]29]. …”

“…The preferred anode material currently used for SOFCs consists of a cermet of Ni and YSZ. However, when using an impure H 2 fuel such as reformed methane, the cermet is poisoned by H 2 S and catalyzes coking reactions, both of which are detrimental to operation of the SOFC [9][10][11][12][13][14][15][16]. Reforming methane, preventing carbon deposition from carbon containing fuels, and removing sulfur impurities from the fuel to below 5 ppm levels, each add to capital and operating costs of the SOFC stack.…”

Sulfur Poisoning of Anode‐Supported SOFCs under Reformate Operation

“…It has also been demonstrated experimentally that the water-gas shift reaction within SOFC anodes is seriously affected by sulfur-poisoning [11].…”