Abstract
One of the technical issues of vanadium redox flow batteries with a carbon paper electrode and interdigitated flow channel is the relatively low current density due to insufficient active material transport downstream in the electrode and low reaction interface area. In this study, we propose a new composite electrode structure, i.e., a porous carbon nanofiber layer that is partially added on the carbon paper. The current density of the composite electrode was higher than that of the unloaded carbon paper electrode due to the lower internal resistances of the battery. In addition, the discharge capacity and voltage efficiency during the charge-discharge operation were improved by the composite structure.
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