Fabrication and Performance of Tubular, Electrode‐Supported BaCe_0.2Zr_0.7Y_0.1O_3–δ Fuel Cells

Abstract

In this report, we describe fabrication and electrochemical‐performance testing of tubular, anode‐supported fuel cells based on the protonic ceramic BaCe0.2Zr0.7Y0.1O3–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 La0.6Sr0.4 Co0.2Fe0.8O3–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 cm2. 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.

Temperature dependence of partial conductivities of the BaZr 0.7 Ce 0.2 Y 0.1 O 3-δ proton conductor

“…The phase BaZr0.7Ce0.2Y0.1O3- (BZCY72, often referred to in the literature as BCZY27) is increasingly regarded as the optimised composition for a number of high-temperature electrochemical membranes. Recent publications have centred on this material as an electrolyte for a protonic ceramic fuel cell (PCFC) [3], and as a membrane reactor for ammonia synthesis [4] or conversion of methane to aromatics [5]. The process of nonoxidative methane dehydroaromatization (MDA) converts natural gas to transportable liquid fuels such as benzene.…”

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr0.7Ce0.2Y0.1O3−δ Proton Conductor

“…Much recent work adopts BaZr0.7Ce0.2Y0.1O3- (BZCY72, often referred to in the literature as BCZY27) as the optimised composition as development towards commericalisation of protonconducting membranes continues [14][15][16] . A full structural analysis is thus required for further understanding and development of this technologically important material.…”

High and intermediate temperature sodium–sulfur batteries for energy storage: development, challenges and perspectives

“…161 Deploying superionic sodium conductors such as NaSICON ( Fig. 10(b), Na 1+x Zr 2 Si x P 3Àx O 12 (0 # x # 3)), [162][163][164][165][166][167] reinforced b 00 -Al 2 O 3 and yttria-stabilized zirconia (YSZ) [168][169][170] 139,175 alkali sulphide glass electrolytes 176,177 and TiN based porous electronically conductive membranes that are selective to faradaic reactions instead of regulated ionic conduction 178 have been reported as an alternative to BASE on an experimental stage. The above sodium ion conductors are primarily destined for solid state batteries, seeking to minimize the ohmic resistance between 0.01 and 0.5 S cm À1 at the set temperature and no capacity retention and shuttle phenomena.…”