Characterization of MnO2 positive electrode for Fuel Cell/Battery (FCB)

• Published in: Journal of power sources Vol. 181; no. 1; pp. 177 - 181
• Main Authors: LEE, Sunmook, CHOI, Bokkyu, HAMASUNA, Nobuyuki, FUSHIMI, Chihiro, TSUTSUMI, Atsushi
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Sequoia 15.06.2008
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Characterization; Manganese oxides; Voltage current curve; Cathode; Manganese dioxide (MnO2),Fuel Cell/Battery (FCB),Fuel cell,Secondary battery; Feasibility; Electrode material; Electric batteries; Performance; Discharge charge cycle; Fuel cell
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2008.02.083

Manganese dioxide was evaluated for use as the positive electrode in fuel cell-secondary battery composite systems. Electrodes were fabricated by coating nickel foam with a mixture of MnO2 and carbon black, and the charge/discharge behaviour studied in three systems: as a secondary battery positive electrode; as the positive electrode in an alkaline fuel cell; and as the positive electrode in a composite system. MnO2 exhibited redox behaviour when used as the positive electrode in a secondary battery and subjected to charge-discharge cycles. When used as the positive electrode in a fuel cell, with a H2 supply to the negative electrode and an O2 supply to the positive electrode, the current-voltage characteristics were comparable to those obtained using a nickel positive electrode. The cell was capable of producing power when the O2 supply was temporarily interrupted. 18 refs.