International Journal of Hydrogen Energy
• An anode supported PCFC was elaborated by Wet Powder Spraying.
• A dense 4 μm thick electrolyte film was obtained by Wet Powder Spraying.
• Wet Powder Spraying was applied to fabricate a porous composite cathode.
• The BCZYYb based cell shows high performances (418 mW cm−2 at 600 °C).
Wet Powder Spraying (WPS) is a well-known method of deposition recently used for elaboration of dense electrolytes or porous electrodes thin films in solid oxide fuel cells. In this work, WPS has been used to deposit the electrolyte and cathode materials of a proton conducting ceramic fuel cell (PCFC) operating at intermediate temperature. A cell with a dense 4 μm thick BaZr0.1Ce0.7Y0.1Yb0.1O3 − δ (BZCYYb) electrolyte, a Ba0.5Sr0.5Co0.8Fe0.203 − δ – BZCYYb (BSCF-BZCYYb) composite cathode and a porous Ni-electrolyte cermet was developed and characterized. The electrolyte and the cathode materials were successfully deposited by WPS on an anode support of 40 mm in diameter. High open-circuit voltages (OCV > 1 V) were observed with this cell, and maximum power densities of 418, 532 and 634 mW cm−2 were obtained at 600, 650 and 700 °C respectively. The results demonstrated that WPS is an attractive technique, suitable for up-scaling planar anode supported PCFC.
BCZYYb-ZnO was dispersed in isopropanol under ultrasonic vibration to form a stable suspension with 10 wt.% of BCZYYb. No further additives such as binders, plasticizers, or dispersants were used. The suspension was sprayed onto the pre-sintered anode substrate held at 250°C with the help of a hot plate using a Spray Coater ND-SP from Nadetech Innovations.
Keywords: Protonic ceramic fuel cell; Intermediate temperature SOFC; Wet powder spraying; BaZr0.1Ce0.7Y0.1Yb0.1O3 − δ