as well as XPS data (Table 1) suggest that their surfacecontains mostly carbon.As a result, a number of carbon materials was selected for thecatalytic studies. The surface of diamond-based (ND and Dsyn)materials was dominated by oxygen-containing groups, whilesome nitrogen was likely incorporated into the structure of ND.For comparison, a series of graphene based materials was selected,which contain some oxygen (CNT, CNF), large amount of incorpo-rated nitrogen (CNF-N), which was reported as an active catalyticsite for oxidation reactions [20]. A control sample was FG becauseit contained almost no groups other than C F.