2026-05-30T14:37:29Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/110962025-11-26T01:05:34Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

00925njm 22002777a 4500 dc Borghei, Maryam author Kanninen, Petri author Lundahl, Meri author Susi, Toma author Sainio, Jani author Anoshkin, Ilya author Nasibulin, Albert G. author Kallio, Tanja author Tammeveski, Kaido author Kauppinen, Esko I. author Ruiz Fernández, Virginia author 2014-10 Nitrogen-containing few-walled carbon nanotubes (N-FWCNTs) with very low nitrogen content (0.56 at.%) were obtained by a process involving the coating of acid functionalized FWCNTs with polyaniline (PANI) followed by pyrolysis at high temperatures. The resulting N-FWCNTs exhibited a remarkable electrocatalytic activity for the oxygen reduction reaction (ORR), despite significantly lower nitrogen content than previously reported in literature. The N-FWCNTs performed on par or better than Pt-C in the cathode of an alkaline direct methanol fuel cell, corroborating the ORR activity observed in the electrochemical cell and exhibiting a higher methanol tolerance. Interestingly, N-FWCNTs showed a high activity for the hydrogen evolution reaction and for the hydrogen peroxide decomposition, suggesting that the active sites involved in ORR can simultaneously catalyze other reactions. This unprecedentedly high activity for such a low N-content can be explained by the exceptional accessibility for the catalytic sites located in open and porous N-doped layer surrounding the FWCNT core, along with the minimization of inactive inner volume and mass compared to larger nitrogen doped multiwalled tubes. 0926-3373 https://hdl.handle.net/10259/11096 10.1016/j.apcatb.2014.04.027 Nitrogen-doped Few-walled carbon nanotubes Oxygen reduction reaction Alkaline fuel cell High oxygen reduction activity of few-walled carbon nanotubes with low nitrogen content