Manufacturing and characterization of metal-supported solid oxide fuel cells

• Published in: Journal of power sources 2011-09, Vol.196 (17), p.7117-7125
• Main Authors: Blennow, Peter, Hjelm, Johan, Klemensø, Trine, Ramousse, Severine, Kromp, Alexander, Leonide, André, Weber, André
• Format: Article
• Language: English
• Subjects: Anodes; Applied sciences; Complex nonlinear least squares fitting; Degradation; Design engineering; Direct energy conversion and energy accumulation; Distribution of relaxation times; Durability; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemical impedance spectroscopy; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Failure; Fuel cells; Loads (forces); Metal-supported; Polarization; Redox stability; SOFC; Solid oxide fuel cells
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2010.08.088

A metal-supported solid oxide fuel cell design offers competitive advantages, for example reduced material costs and improved robustness. This paper reports the performance and stability of a recently developed metal-supported cell design, based on a novel cermet anode, on a 25 cm 2 (1 cm 2/16 cm 2 active area) cell level. An electrochemical performance comparable to state-of-the-art anode-supported cells is demonstrated. Detailed electrochemical analysis allowed assignment of the overall polarization losses quantitatively to gas diffusion in the metal support, electrooxidation in the anode functional layer, oxygen reduction in the mixed ionic-electronic conducting cathode and an additional polarization process with a rather high relaxation frequency, which may be assigned to an insulating corrosion interlayer. The durability of the cells was investigated by means of galvanostatic operation for periods of up to 1000 h as well as the dynamic behavior, such as redox-, load- and thermal cycling tests. The galvanostatic stability tests indicated a fair, but significant degradation rate (∼5% decrease in cell voltage/1000 h at 650 °C and 0.25 A cm −2). Furthermore, the metal-supported cells underwent an endurance test of 100 redox cycles at 800 °C without severe degradation nor total failure.