Research of GDC barrier layer applications by hydrothermal in situ growth in industrial-sized SOFC
Gd2O3-doped CeO2(GDC)barrier layer is a crucial component of solid oxide fuel cells(SOFC),which effectively prevents side reactions between the high-performance cathode La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)and the Y0.16Zr0.84O2-δ(YSZ)electrolyte.The traditional wet ceramic technology used to prepare the GDC barrier layer results in low densities and excessive thicknesses.This fails to adequately prevent the diffusion of Sr and other elements and increases the ohmic impedance of the cell.Conversely,advanced coating technologies can produce ultrathin,dense GDC isolation layers;however,these methods incur high costs and are challenging to implement on nonflat plate-type cell surfaces.Previous research introduced a novel approach for creating dense GDC barrier layers through hydrothermal in situ growth.This method successfully yielded an ultrathin,dense GDC barrier layer on the YSZ electrolyte surface of an anode-supported cell,considerably enhancing the electrochemical performance of the cell.Considerably,the hydrothermal in situ growth technique was scaled up by 60 times,enabling the preparation of a continuous,0.7 μm thick GDC barrier layer on a 10 cm×10 cm industrial-sized anode-supported single cell.This development led to the construction of a GDC/YSZ bilayer electrolyte,substantially reducing the interfacial resistance of the cell and boosting its output performance.At 720℃ and under a working condition of 0.7 V,the output power of the single cell reached 61.6 W.This study demonstrates the potential for low-cost production of dense GDC barrier layers in industrial-sized SOFC single cells and confirms the viability of hydrothermal in situ growth technology for industrial applications.
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