Thin-film libraries of libraries ( ; ) have been prepared by combinatorial sputter deposition. The libraries were subsequently annealed at 700, 800, and to induce structural and compositional changes. Respectable catalytic activity was achieved with libraries having and that were annealed at . This is explained in terms of nitrogen content and the degree of graphitization of the annealed catalysts.
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Easton et al. (2006) studied this question.