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SummaryTreatments with organic surfactants, followed by the deposition of nanocrystalline ceria coatings from aqueous solution, were applied to anodes of solid oxide fuel cells. The cells were then operated in hydrogen/nitrogen fuel streams with H2S contents ranging from 0 to 500 ppm. Two surfactant treatments were studied: immersion in dodecanethiol, and a multi-step conversion of a siloxy-anchored alkyl bromide to a sulfonate functionality. The ceria coatings deposited after the thiol pretreatment, and on anodes with no pretreatment, were continuous and uniform, with thicknesses of 60–170 nm and 100–140 nm, respectively, and those cells exhibited better lifetime performance and sulfur tolerance compared to cells with untreated anodes and anodes with ceria coatings deposited after the sulfonate pretreatment. Possible explanations for the effects of the treatments on the structure of the coatings, and for the effects of the coatings on the performance of the cells, are discussed.

025ChemInform Abstract The behavior of a solid bismuth hydride (s-BiH) electrode, prepared by electrodeposition from a Bi2O3/NaClO4/HClO4 solution, in an NaClO4/HClO4 electrolyte containing various amounts of Cr(ClO4)3 has been investigated by cyclic voltammetry in the presence and absence of NaCl. The results indicate that s-BiH is a good catalyst for Cr(III) reduction and that the overpotential for H2 evolution is high enough for the reduction of the unsubstituted Cr(H2O)63+ to occur with negligible H2 generation in acid electrolytes. The s-BiH may be of interest as a catalyst for energy storage systems such as the Cr(III)/(II)//Fe(II)/(III) redox flow cell but it is necessary to maintain the s-BiH electrode under polarized conditions in the presence of Cr3+ to prevent oxidative loss of the hydride.