Enhanced Sulfur Tolerance of Nickel-Based Anodes for Oxygen-Ion Conducting Solid Oxide Fuel Cells by Incorporating a Secondary Water Storing Phase
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In this work, a Ni+BaZr0.4Ce0.4Y0.2O3-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 Sm0.2Ce0.8O1.9 (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.
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Rational Design of a Water-Storable Hierarchical Architecture Decorated with Amorphous Barium Oxide and Nickel Nanoparticles as a Solid Oxide Fuel Cell Anode with Excellent Sulfur ToleranceSong, Y.; Wang, Wei; Ge, L.; Xu, X.; Zhang, Z.; Julião, P.; Zhou, W.; Shao, Zongping (2017)© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Solid oxide fuel cells (SOFCs), which can directly convert chemical energy stored in fuels into electric power, represent a useful technology for a more sustainable ...
A novel way to improve performance of proton-conducting solid-oxide fuel cells through enhanced chemical interaction of anode componentsGuo, Y.; Ran, R.; Shao, Zongping (2011)We proposed a novel way to improve the cell performance of proton-conducting solid-oxide fuel cells by increasing the chemical interaction between the anode components using BaZr0.4Ce0.4Y 0.2O3-d (BZCY4) as the ionic ...
Enhanced electrochemical performance, water storage capability and coking resistance of a Ni+BaZr0.1Ce0.7Y0.1Yb0.1O3−δ anode for solid oxide fuel cells operating on ethanolWang, W.; Chen, Y.; Wang, F.; Tade, Moses; Shao, Zongping (2015)To improve the water storage capability, electrochemical activity and coking resistance of the Ni+BaZr0.4Ce0.4Y0.2O3-δ (BZCY4) material, the reduction of Zr amount and partial Yb doping on Y site are investigated in this ...