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A Preliminary Study on WO 3 ‐Infiltrated W–Cu–ScYSZ Anodes for Low Temperature Solid Oxide Fuel Cells
Author(s) -
Mohammed Hussain A.,
Sudireddy B. R.,
Høgh J. V. T.,
Bonanos N.
Publication year - 2012
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201200003
Subject(s) - anode , materials science , microstructure , solid oxide fuel cell , dielectric spectroscopy , sintering , oxide , chemical engineering , electrochemistry , porosity , oxidizing agent , conductivity , electrode , composite material , metallurgy , chemistry , organic chemistry , engineering
Preparation and electrochemical characterization of WO 3 ‐infiltrated 0.48W–0.52Cu–ScYSZ (WCS) anode for solid oxide fuel cell are reported. The DC conductivity of a WO 3 ceramic was 1,200 and 24 S cm –1 in reducing and oxidizing atmospheres, respectively, at 650 °C. WCS porous backbones in the form of symmetric cells were prepared by screen printing of WO 3 –CuO–ScYSZ ink and subsequent sintering at 1,300 °C for 1 h in 9% H 2 /N 2 . Analysis of the sintered backbone by X‐ray diffraction showed the metallic W and Cu phases. Precursor solutions of WO 3 or CuO were infiltrated into porous WCS backbones to form the anode. The electrochemical performance of these anodes measured by impedance spectroscopy showed polarization resistances of 11 and 6.5 Ω cm 2 for WO 3 and CuO infiltrated anodes, respectively, at 600 °C in humidified hydrogen. Activation energy values of 86.8 and 96.5 kJ mol –1 were obtained for WO 3 and CuO infiltrated WCS anodes, respectively. The microstructure of the tested anodes showed well‐dispersed sub‐micron particles of WO 3 in the WCS backbone whereas CuO infiltration resulted in a dense microstructure.