Abstract
Anode aluminum oxide-supported thin-film fuel cells having a sub-500-nm-thick bilayered electrolyte comprising a gadolinium-doped ceria (GDC) layer and an yttria-stabilized zirconia (YSZ) layer were fabricated and electrochemically characterized in order to investigate the effect of the YSZ protective layer. The highly dense and thin YSZ layer acted as a blockage against electron and oxygen permeation between the anode and GDC electrolyte. Dense GDC and YSZ thin films were fabricated using radio frequency sputtering and atomic layer deposition techniques, respectively. The resulting bilayered thin-film fuel cell generated a significantly higher open circuit voltage of approximately 1.07 V compared with a thin-film fuel cell with a single-layered GDC electrolyte (approximately 0.3 V).
Highlights
Solid oxide fuel cells (SOFCs) normally operate at considerably high temperatures (>700°C) to facilitate ionic charge transport and electrode kinetics [1,2]
We demonstrate a prototypical, AAOsupported thin-film fuel cell with a bilayered electrolyte comprising a gadolinium-doped ceria (GDC) film and a thin protective yttria-stabilized zirconia (YSZ) layer
A GDC thin-film deposited at 500°C (GDC-H) was compared to a film prepared at room temperature (GDC-R)
Summary
Solid oxide fuel cells (SOFCs) normally operate at considerably high temperatures (>700°C) to facilitate ionic charge transport and electrode kinetics [1,2]. Encountered by issues such as limited material selection and poor cell durability, many researchers have tried to reduce the operating temperature [3,4,5]. Lower operating temperature led to a significant sacrifice in energy conversion efficiency due to the resulting increase in ohmic and activation losses [1]. There are roughly two ways to minimize the ohmic loss surging at lower operating temperatures. Shim et al demonstrated that a fuel cell employing a 40-nmthick yttria-stabilized zirconia (YSZ) can generate a power density of 270 mW/cm at 350°C [11], while Kerman et al demonstrated 1,037 mW/cm at 500°C from a 100-nm-
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