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Co-sputtering of Ni-GDC Anode for Thin-film SOFCs Operating on Nearly Dry Methane at Low Temperature
I. W. Choi(최인원),G. Y. Cho(조구영),S. B. Ryu(류상봉),S. W. Cha(차석원) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Direct-methane solid oxide fuel cells (DMSOFCs) have attracted much attention owing to the simplified system, reduced cost, and direct availability of methane fuel obtained from natural gas. Among oxygen-ion conductive materials, doped-ceria such as gadolinium-doped ceria (GDC) or samarium-doped ceria can be incorporated into Ni-based anodes to reinforce the coking resistance, enlarge the electrochemical reaction area, and improve the kinetics of internal reforming/electrochemical oxidation of methane. In order to lower the operating temperature range while maintaining performance of DMSOFCs, a thin-film deposition technique was adopted in this work. Anodized aluminum oxide (AAO)-supported thin-film cells with Ni-GDC anode/Yttria-stabilized zirconia electrolyte/Pt cathode structure were fabricated by magnetron-sputtering. Ni-GDC volume fraction was controlled by co-sputtering power of Ni-GDC deposition. These cells with different GDC volume fraction were tested under an operation condition of methane fuel with low S/C ratio (3% H₂O) and low temperature (500℃). Effects of GDC volume fraction on open circuit voltage (OCV) and electrochemical performance were demonstrated. As GDC volume fraction increases, OCV over 1.0 V is successfully achieved and the performance was improved up to an optimal composition. Long-term stability and resistance to carbon coking was evaluated by FE-SEM and XPS techniques.