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Fabrication and Performance of Tubular, Electrode‐Supported BaCe 0.2 Zr 0.7 Y 0.1 O 3–δ Fuel Cells
Author(s) -
Robinson S.,
Manerbino A.,
Grover Coors W.,
Sullivan N. P.
Publication year - 2013
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.201200191
Subject(s) - materials science , anode , non blocking i/o , electrolyte , sintering , cathode , hydrogen , analytical chemistry (journal) , atmospheric temperature range , electrode , electrochemistry , fabrication , chemical engineering , composite material , catalysis , chemistry , biochemistry , physics , organic chemistry , chromatography , meteorology , engineering , medicine , alternative medicine , pathology
In this report, we describe fabrication and electrochemical‐performance testing of tubular, anode‐supported fuel cells based on the protonic ceramic BaCe 0.2 Zr 0.7 Y 0.1 O 3–δ (BCZY27). These devices are comprised of a 20‐μm‐thick BCZY27 electrolyte spray‐coated and co‐fired onto an extruded, tubular 9.8‐mm‐diameter, 1.25‐mm‐thick 65 wt.% NiO/35 wt.% BCZY27 anode support. Reactive sintering with NiO forms the BCZY27 material from parent oxides. An La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3–δ (LSCF) cathode is applied following co‐sintering. While anode supports can be extruded to 3‐m lengths, the active area of the cells tested here is 7.5 cm 2 . Performance is quantified through polarization measurements across a range of temperatures with hydrogen‐air reactants. Peak power ranges from 78 to 189 mW cm –2 over the 700–850 °C temperature range. Open‐circuit voltage decreases with increasing operating temperature due to the co‐diffusion of the multiple charge carriers present. The ionic transference number is determined over a range operating temperatures and anode‐gas compositions, and is found to range from 0.77 to 0.88. Finally, an external power supply is used to drive hydrogen across the BCZY27 membrane. At an applied current density of 1 A cm –2 and 700 °C operating temperature, hydrogen flux is measured at 7.5 smL min –1 cm –2 active area.