| 초록 |
Graphene foam is three-dimensional graphene-based material which is made by CVD on nickel foam, following by etching away nickel foam. Various kinds of metal foam have been developed as flow field because high porosity of metal foam distributes uniformly reactants on entire area and removes water inhibiting flooding in flow field. However, metal foam is highly susceptible to corrosion due to acidic operation condition of polymer electrolyte membrane fuel cell. In this work, graphene foam was employed as flow field by substituting metal for graphene. Graphene foam has advantages such as structure characteristic of foam and hydrophobicity of graphene. Therefore, single cell with graphene foam indicated the enhanced mass transport and increased performance in high current densities. Also, oxygen gain and electrochemical impedance spectroscopy were evaluated to investigate the effect of graphene foam on enhanced mass transport and showed the mass transport resistance are decreased. |
