Modified Graphene as Electrocatalyst towards Oxygen Reduction Reaction for Fuel Cells

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Qazzazie, D.^1,2 ; Beckert, M.^3 ; Mülhaupt, R.^3 ; Yurchenko, O.^1,2 ; Urban, G.^2

Freiburg Materials Research Center, FMF, University of Freiburg, Stefan-Meier-Strasse 21, Freiburg

79104, Germany^1

Department of Microsystems Engineering, IMTEK, University of Freiburg, Germany^2

Institute for Macromolecular Chemistry, University of Freibrug, Germany^3

关键词: Alkaline conditions;    Electrocatalytic activity;    Electrochemical characterizations;    Metal-free electrocatalysts;    Nitrogen doped graphene;    Oxygen reduction reaction;    Reference electrodes;    Structural characterization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012009/pdf
DOI  :  10.1088/1742-6596/557/1/012009

来源: IOP

【 摘 要 】

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.