Stable N-doped & FeNidecorated graphene non-precious electrocatalyst for Oxygen Reduction Reaction in Acid Medium
| Autor: | Saeed Al-Meer, Nasser A.M. Barakat, Zafar Khan Ghouri, Ahmed G. El-Deen |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Science Energy science and technology Alloy Oxide 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry Electrocatalyst 01 natural sciences Article NiMn Naoparticles law.invention Metal chemistry.chemical_compound law Nanoscience and technology Multidisciplinary Nanocomposite Graphene 021001 nanoscience & nanotechnology 0104 chemical sciences Physical sciences Chemical engineering chemistry visual_art Electrode engineering visual_art.visual_art_medium Medicine 0210 nano-technology |
| Zdroj: | Scientific Reports, Vol 8, Iss 1, Pp 1-11 (2018) Scientific Reports |
| Popis: | NiFe nanoparticles-decorated & N-doped graphene is introduced as an effective and stable nonprecious electrocatalyst for ORR in the acid medium. Compared to conventional Pt/C electrodes under the same conditions, the proposed nanocatalyst shows closer onset potential and current density. Typically, the observed onset potentials and current densities for the synthesized and Pt/C electrodes are 825 and 910 mV (vs. NHE) and −3.65 and −4.31 mA.cm−2 (at 5 mV.s−1), respectively. However, the most important advantage of the introduced metallic alloy-decorated graphene is its distinct stability in acid medium; the retention in the electrocatalytic performance after 1,000 successive cycles is approximately 98%. This finding is attributed to the high corrosion resistance of the NiFe alloy. The kinetic study indicates that the number of the transferred electrons is 3.46 and 3.89 for the introduced and Pt/C (20 wt%) electrodes, respectively which concludes a high activity for the proposed nanocomposite. The suggested decorated graphene can be synthesized using a multithermal method. Typically, nickel acetate, iron acetate, graphene oxide and urea are subjected to MW heating. Then, sintering with melamine in an Argon atmosphere at 750 °C is required to produce the final electrocatalyst. Overall, the introduced NiFe@ N-doped Gr nanocomposite shows remarkable electrochemical activity in the acid medium with long-term stability. This Publication was made possible by NPRP grant # [8-1344-1-246] from the Qatar National Research Fund (a member of Qatar Foundation). The findings achieved herein are solely the responsibility of authors |
| Databáze: | OpenAIRE |
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