| 초록 |
Edge-functionalized graphene nanoplatelets were simply prepared by eco-friendly method via ball milling in the presence of hydrogen, carbon dioxide, sulfur trioxide and carbon dioxide/sulfur trioxide mixture. The resultant hydrogen- (HGnP), carboxylic acid (CGnP), sulfonic acid (SGnP) and carbocylic acid/sulfonic acid (CSGnP) functionalized graphene nanplatelets were studied with TEM and SEM, EA, EDX, FT-IR, TGA, and XPS. The electrocatalysis of the oxygen reduction reaction (ORR) on HGnP, CGnP, SGnP and CSGnP were evaluated in 0.1 M KOH by cyclic voltammetry and rotating disk electrode system. The electrocatalytic activity is in the order of SGnP ＞ CSGnP ＞ CGnP ＞ HGnP ＞ pristine graphite, suggesting that the efficiency of oxygen reduction reaction (ORR) is significantly attributable to the edge nature of graphitic structure. These results indicated that electrocatalytic activities follow well the polarity, indicating diffusion control also plays an important role. |
