التفاصيل البيبلوغرافية
| العنوان: |
The chemical state of iron species influence on the performance of Fe–N–C bifunctional electrocatalyst for Zn–air batteries. |
| المؤلفون: |
Dong, Wenjing1 (AUTHOR), Liu, Wei1 (AUTHOR), Feng, Yuan1 (AUTHOR), Huang, Naibao1 (AUTHOR) nbhuang@dlmu.edu.cn |
| المصدر: |
Nanotechnology. 2/5/2024, Vol. 35 Issue 6, p1-12. 12p. |
| مصطلحات موضوعية: |
*IRON, *METAL-air batteries, *OXYGEN evolution reactions, *PRECIOUS metals, *LITHIUM cells, *STORAGE batteries, *POWER density, *OXYGEN reduction |
| مستخلص: |
Fe–N–C materials have emerged as promising alternatives to precious metals for oxygen reduction reaction/oxygen evolution reaction (ORR/OER). In this study, a strategy is presented to investigate the influence of different chemical states of iron species in Fe–N–C materials on their electrocatalytic performance. Three Fe–N–C catalysts, containing either zero-valent Fe or Fe3O4 nanoparticles, are synthesized using acid pickling, high-speed centrifugation and ultrasound-assisted hydrothermal methods, respectively. The findings manifest that the chemical state of iron significantly affects the electrocatalytic activity of Fe–NX active sites, namely zero-valent Fe enhancing Fe–NX activity while Fe3O4 weakening its activity. Notably, the Fe@FeNC catalyst containing only zero-valent iron, demonstrates the only 0.621 V potential difference between the ORR half-wave potential and the OER potential at 10 mA cm−2. Furthermore, the rechargeable Zn–air battery assembled with Fe@FeNC as the air cathode exhibits a remarkable peak power density of 179.0 mW cm−2, excellent cycling stability over 210 h (with a cycle frequency of one every 10 min), and the minimal voltage gap of 0.710 V. These results reveal the significance of different chemical states of metal-based nanoparticles in Fe–NX activity of Fe–N–C catalysts and offer insights into the rational design of electrocatalysts with exceptional activity and versatile applications. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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