Investigation of Nitrogen-Doping Influence on the Electrocatalytic Activity of Graphene in Alkaline Oxygen Reduction Reaction
| Autor: | Raimundo R. Passos, Raquel Alves Corrêa Lima, L. A. Pocrifka, Aluísio José Cordeiro Pinto Júnior |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scanning electron microscope Inorganic chemistry 02 engineering and technology Thermal treatment 010402 general chemistry Electrocatalyst 01 natural sciences law.invention Oxygen reduction reaction chemistry.chemical_compound symbols.namesake law General Materials Science Materials of engineering and construction. Mechanics of materials Graphene Mechanical Engineering metal-free electrocatalysis 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry Mechanics of Materials Urea symbols TA401-492 0210 nano-technology Selectivity Raman spectroscopy Current density nitrogen-doped graphene thermal treatment |
| Zdroj: | Materials Research, Vol 24, Iss 3 (2021) Materials Research, Volume: 24, Issue: 3, Article number: e20200375, Published: 24 MAY 2021 Materials Research v.24 n.3 2021 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
| ISSN: | 1516-1439 |
| Popis: | Fuel cell is considered an energetic solution of low environmental impact which large-scale commercialization is hindered by the expensive Pt-based cathodic electrocatalyst. Therefore, its replacement by an active less-expensive metal-free electrocatalyst such as nitrogen-doped graphene (N-graphene) is desirable. To investigate nitrogen-doping influence on graphene’s activity in alkaline oxygen reduction reaction (ORR), we prepared N-graphene through thermal treatment of graphene and urea at 800 °C for 30 min. N-graphene exhibited higher onset potential, half-wave potential, diffusion-limited current density and kinetic current density in ORR (0.78 V vs RHE, 0.63 V vs RHE, -3.36 mA cm-2, -3.00 mA cm-2, respectively) than undoped graphene (0.73 V vs RHE, 0.62 V vs RHE, -2.80 mA cm-2, -2.23 mA cm-2, respectively), which may be attributed to nitrogen-doping, edges and defect sites in N-graphene, as revealed by elemental analysis, scanning electron microscopy and Raman spectroscopy results. This activity improvement also affected ORR’s selectivity and rate-determining step. |
| Databáze: | OpenAIRE |
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