On the nature of oxygen-containing surface groups on carbon nanofibers and their role for platinum deposition—an xps and titration study

Abstract

XPS and acid−base titrations were used to investigate the nature and stability of oxygen-containing surface groups on carbon nanofibers (CNF) and platinum-containing CNF. During heat treatments in inert atmosphere at 973 K all acidic (carboxylic) oxygen surface groups were removed for CNF. Introduction of platinum decreased the temperature at which the acidic oxygen surface groups could be removed to 773 K. It has been demonstrated that both carboxyl and phenol surface groups are able to bring about platinum ion adsorption during Pt/CNF synthesis.