Abstract
15N labeled polyaniline is prepared as a precursor of N-doped carbon catalysts and is pyrolyzed at several different temperatures in a nitrogen atmosphere. The oxygen reduction reaction is evaluated by rotating disk electrode experiments, and solid-state 15N NMR and XPS spectra of the samples are measured. The relationship between oxygen reduction activity and the chemical structure, combined with principal component analysis is discussed. Using principal component analysis of the XPS and 15N solid-state NMR spectra, it is found that most pyridinic, graphitic, and pyridinium-like or pyrrolic nitrogen atoms in the samples are not related to oxygen reduction reaction. However, the samples which contain a larger proportion of some particular type of pyridinic nitrogen atoms show a higher activity for the oxygen reduction reaction.
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