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15 N-labeled polyaniline (PANI) is heat treated at temperatures from 200 to 1000°C in a nitrogen atmosphere. The carbonization of PANI is determined using solid state (SS) 13 C and 15 N NMR. In an attempt to accurately assign the experimentally observed 15 N NMR chemical shift, theoretical nitrogen shielding is calculated using ab initio MO calculations. The SS NMR results...
New analytical method for characterizing the nitrogen sites in N-doped carbon catalysts is proposed by employing 15 N solid-state NMR. 15 N labeled polypyrrole 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...
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Authors. This paper is retracted at the request of the authors because it has been discovered that L. Wu included false data in Fig. 7 in this paper. It is noted that a fact-finding commission of Tokyo Institute of...
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