title: Enhanced sulfur tolerance of nickel-based anodes for oxygen-ion conducting solid oxide fuel cells by incorporating a secondary water storing phase.
abstract: In this work, a Ni+BaZr(0.4)Ce(0.4)Y(0.2)O(3-δ) (Ni+BZCY) anode with high water storage capability is used to increase the sulfur tolerance of nickel electrocatalysts for solid oxide fuel cells (SOFCs) with an oxygen-ion conducting Sm(0.2)Ce(0.8)O(1.9) (SDC) electrolyte. Attractive power outputs are still obtained for the cell with a Ni+BZCY anode that operates on hydrogen fuels containing 100-1000 ppm of H2S, while for a similar cell with a Ni+SDC anode, it displays a much reduced performance by introducing only 100 ppm of H2S into hydrogen. Operating on a hydrogen fuel containing 100 ppm of H2S at 600 °C and a fixed current density of 200 mA cm(-2), a stable power output of 148 mW cm(-2) is well maintained for a cell with a Ni+BZCY anode within a test period of 700 min, while it was decreased from an initial value of 137 mW cm(-2) to only 81 mW cm(-2) for a similar cell with a Ni+SDC anode after a test period of only 150 min. After the stability test, a loss of the Ni percolating network and reaction between nickel and sulfur appeared over the Ni+SDC anode, but it is not observed for the Ni+BZCY anode. This result highly promises the use of water-storing BZCY as an anode component to improve sulfur tolerance for SOFCs with an oxygen-ion conducting SDC electrolyte.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University , No. 5 Xin Mofan Road, Nanjing 210009, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Jifa
authors.initials: J
authors.lastname: Qu
authors.forename: Yijun
authors.initials: Y
authors.lastname: Zhong
authors.forename: Mose O
authors.initials: MO
authors.lastname: Tade
authors.forename: Zongping
authors.initials: Z
authors.lastname: Shao
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry; D006862:Hydrogen Sulfide / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D008670:Metals; D010087:Oxides; D014867:Water; D013455:Sulfur; D006859:Hydrogen; D010100:Oxygen; D006862:Hydrogen Sulfide