Self-Sealing Metal-Supported SOFC Fabricated by Plasma Spraying and Its Performance under Unbalanced Gas Pressure
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Self-Sealing Metal-Supported SOFC Fabricated by Plasma Spraying and Its Performance under Unbalanced Gas Pressure Jiu-Tao Gao1 • Jia-Hong Li1 • Yue-Peng Wang1 • Chang-Jiu Li1 • Cheng-Xin Li1
Submitted: 24 April 2020 / in revised form: 30 August 2020 Ó ASM International 2020
Abstract A novel self-sealing structure for metal-supported solid oxide fuel cells (MS-SOFCs) is designed by applying brazing technology between the metal support and interconnector to solve the sealing problem on the anode side of planar SOFCs. A high-reliability self-sealing effect is thus realized at the anode side of the MS-SOFC. Plasma spraying technology is used to prepare cell functional layers including the anode, cathode, and electrolyte. A single cell is assembled with a 50–60-lm plasmasprayed Sc2O3-stabilized ZrO2 (ScSZ) electrolyte layer. The gas permeability of the self-sealed MS-SOFC without a cathode layer is 0.42 9 10-17 m2. The open-circuit voltage of the cell is * 1.1 V in the operating temperature range from 550 to 750 °C. The power density of the cell reaches 1109 mW cm-2 at 750 °C under standard atmosphere. In addition, the use of a fuel gas pressure that is 20 kPa higher than the cathodic gas pressure results in a significant increase in the power density to 1782 mW cm-2 at 750 °C. The novel cell structure and gas tightness of the ScSZ electrolyte prepared by plasma spraying indicates that it can meet the requirements of SOFC applications. Keywords metal-supported solid oxide fuel cells (MSSOFCs) plasma spraying performance unbalanced gas pressure
& Cheng-Xin Li [email protected] 1
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, China
Introduction Solid oxide fuel cells (SOFCs) can directly convert chemical energy stored in fuel gas to electrical energy, which offers many advantages such as high efficiency, low emissions, and environmental friendliness (Ref 1-3). The two main challenges in commercialization of SOFC technology are cost and reliability, which can be solved by lowering the operating temperature (Ref 4-6). In recent years, the operating temperatures of SOFCs have been reduced to below 750 °C or even lower, enabling the application of more metallic materials in SOFC systems (Ref 7-9). The component supporting the ceramic functional layers in metal-supported SOFCs (MS-SOFCs) are made of porous metallic material. In comparison with traditional all-ceramic SOFCs, MS-SOFCs offer some advantages such as higher thermal conductivity, electrical conductivity, redox stability, tolerance to redox cycles, and mechanical strength (Ref 6, 10-12). The material cost of MS-SOFC is lower than that of electrolyte- or anode-supported SOFC (Ref 13). In addition, the machinability of the metallic material facilitates MS-SOFC assembly (Ref 14). Meanwhile, due to the high strength of the metallic material, MS-SOFCs can withstand repeated and rapid thermal cycling (Ref 12). SOFCs require hermetic sealing to s
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