A green preparation of nitrogen doped graphene using urine for oxygen reduction in alkaline fuel cells
| Autor: | Dae-Cheol Jeong, Seungwon Jeon, Mohammad Shamsuddin Ahmed, Jung-Min You, Hyoung Soon Han |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Reducing agent Nitrogen Inorganic chemistry Biomedical Engineering Bioengineering Alkalies Urine law.invention chemistry.chemical_compound X-ray photoelectron spectroscopy X-Ray Diffraction law Spectroscopy Fourier Transform Infrared Humans General Materials Science Fourier transform infrared spectroscopy Graphene Thermal decomposition technology industry and agriculture General Chemistry Chronoamperometry Condensed Matter Physics Oxygen chemistry Urea Graphite Cyclic voltammetry |
| Zdroj: | Journal of nanoscience and nanotechnology. 14(8) |
| ISSN: | 1533-4880 |
| Popis: | A simple, eco-friendly and efficient harmless chemical approach has been developed for the simultaneous nitrogen (N) doping and reduction of graphene oxide (GO) by cost free human urine using simple refluxing. Large-scale preparation of graphene has been hindered largely by several issues, such as highly toxic reducing agents that are harmful to human health and environment, complicated reduction process and costly chemicals. Human urine is a natural precursor of urea with no cost. In this process, the NH3 has acted as not only reducing but also doping agent that produced via thermal decomposition of urea, while the N doping level of ~11.1 at% is achieved. For the first time we have used urine as a reductant and doping agent in such a high class chemical technology. The simultaneous reduction and N-doping of GO using urine (denoted as UNG) have confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and UV-vis spectroscopy. The resultant UNG has demonstrated to show remarkable electrocatalytic activity toward oxygen reduction reaction (ORR) with better fuel selectivity, and stability than that of the commercially available 20 wt% Pt/C electrode using cyclic voltammetry (CV) and chronoamperometry. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|