Research of GDC barrier layer applications by hydrothermal insitu growth in industrial-sized SOFC

doi:10.19799/j.cnki.2095-4239.2024.0096

Abstract

Abstract:

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 La_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δ (LSCF) and the Y_0.16Zr_0.84O_2-_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 insitu 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 insitu 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.

Key words: industrial-sized SOFC, GDC barrier layer, hydrothermal in-situ growth, electrolytes, interface

CLC Number:

TQ 150.9

Zongxun LI, Qiuqiu LYU, Haoyu ZHAO, Jianyu HE, Yang LIU, Zaihong SUN, Kaihua SUN, Tenglong ZHU. Research of GDC barrier layer applications by hydrothermal insitu growth in industrial-sized SOFC[J]. Energy Storage Science and Technology, 2024, 13(7): 2407-2413.

Figures/Tables 9

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720 ℃ 1 L/min H₂, 3 L/min Air	OCV/V	P_0.9V/W	P_0.8V/W	P_0.7V/W	R_Ω/(Ω·cm²)	R_P/(Ω·cm²)
SP-GDC	1.243	20.2	30.7	38.5	0.342	0.764
HY-GDC	1.252	32.3	48.8	61.6	0.240	0.520

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