Abstract
The use of manganese dioxide (MnO 2) as a positive electrode material in Fuel Cell/Battery (FCB) systems is described. A positive electrode containing MnO 2 was fabricated and its performance was evaluated for charge/discharge behavior in three different systems: (i) secondary battery positive electrode, (ii) positive electrode in an alkaline fuel cell, and (iii) positive electrode performance in an FCB system by performing half cell tests. MnO 2 was observed to possess redox capabilities as the positive electrode of a secondary battery when it was subject to charge/discharge cycles. It was found that Mn 3O 4, which inhibits the discharge reaction, was produced during charge/discharge cycles. The I– V characteristics of MnO 2 material were measured to check the feasibility of the fuel cell system by supplying H 2 into the negative electrode and O 2 into the MnO 2 positive electrode, respectively. The MnO 2 electrode showed similar performance to Ni electrode, which was fabricated by using a similar method to the MnO 2 electrode. The MnO 2 electrode also showed that it functioned as an FCB positive electrode, which was confirmed by continued production of current when the O 2 supply was terminated. These results suggest that MnO 2 is a good candidate for an FCB positive electrode material.
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