Development of Fuel Cell/Battery System for High-Power Generation and High-Capacity Energy Storage by Using Three-Dimensional Electrode Structures

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Fuel cell/battery (FCB) systems are promising power generation/energy storage systems because of their bi-functionality as fuel cells and as secondary batteries. From the current research, it was found that MnOOH formed via the electrochemical discharge of manganese dioxide (MnO2) and that the oxyhydroxide can be chemically transformed back to MnO2 with gaseous oxygen (O2). The recharged MnO2 can be used as the cathode in a fuel cell with an O2 supply and it can also be electrochemically discharged without an O2 supply. This study suggest that the FCB system can be constructed using MnO2 as the cathode and a metal hydride as the anode, which can be rapidly charged to more than 70% of the theoretical capacity within 10 min using pressurized H2 and electrochemically discharged. Furthermore, a novel fibrous MnO2 electrode for FCB system was fabricated on carbon fiber by the electrodeposition method in order to improve contact area between MnO2 and the electrical conducting material.