Modified Graphene as Electrocatalyst towards Oxygen Reduction Reaction for Fuel Cells

Autor:	Dureid Qazzazie, Rolf Mülhaupt, Michaela Beckert, O. Yurchenko, Gerald Urban
Rok vydání:	2014
Předmět:	History Materials science Graphene Inorganic chemistry Electrochemistry Electrocatalyst Electron spectroscopy Reference electrode Computer Science Applications Education law.invention Catalysis symbols.namesake X-ray photoelectron spectroscopy law symbols Raman spectroscopy
Zdroj:	Journal of Physics: Conference Series. 557:012009
ISSN:	1742-6596 1742-6588
DOI:	10.1088/1742-6596/557/1/012009
Popis:	This paper reports modified graphene-based materials as metal-free electrocatalysts for oxygen reduction reaction (ORR) with outstanding electrocatalytic activity in alkaline conditions. Nitrogen-doped graphene samples are synthesized by a novel procedure. The defect density in the structure of the prepared materials is investigated by Raman spectroscopy. Further structural characterization by X-ray photoelectron spectroscopy reveals the successful nitrogen doping of graphene. The electrochemical characterization of graphene and nitrogen-doped graphene in 0.1 M KOH solution demonstrates the material's electrocatalytic activity towards ORR. For graphene an onset potential of – 0.175 V vs. Ag/AgCl reference electrode is determined, while for nitrogen-doped graphene the determined onset potential is – 0.160 V. Thus, the electrocatalytic activity of nitrogen-doped graphene towards ORR is enhanced which can be ascribed to the effect of nitrogen doping.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e499dd73ed4cdb538c8fef868b4f1551 https://doi.org/10.1088/1742-6596/557/1/012009 Zobrazit plný text záznamu