Oxygen Reduction Activity of Pyrolyzed Polyanilines Studied by 15N Solid-State NMR and XPS with Principal Component Analysis

Autor:	Shigeki Kuroki, Masaaki Kakimoto, Seizo Miyata, Yuta Nabae
Rok vydání:	2011
Předmět:	Materials science X-ray photoelectron spectroscopy Solid-state nuclear magnetic resonance Inorganic chemistry Principal component analysis Analytical chemistry Pyrolysis Oxygen reduction
Zdroj:	ECS Transactions. 41:2269-2276
ISSN:	1938-6737 1938-5862
DOI:	10.1149/1.3635759
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e3430fe5db139cf6a6444bc7d783814 https://doi.org/10.1149/1.3635759 Zobrazit plný text záznamu