| Autor: |
Ma, Bingjie, Ouyang, Liuzhang, Zheng, Jie |
| Předmět: |
|
| Zdroj: |
Journal of Magnesium & Alloys; Oct2024, Vol. 12 Issue 10, p4191-4204, 14p |
| Abstrakt: |
• Magnesium-rare earth intermetallic compounds as anodes for Mg-air battery are first investigated. • Mg 3 RE anodes provide higher power density and more stable discharge process. • The homogeneous RE doping in Mg 3 RE can suppress the H 2 evolution and promote the uniform dissolution of substrate at high current. • The activation mechanism of Mg 3 RE anodes during discharge has been explored detailly. Magnesium alloys are light structural materials and promising anode candidates for Mg-air batteries. However, application of Mg-air batteries is limited by poor performance at large current density and severe H 2 generation side reactions. In this study, we pioneered magnesium-rare earth Mg 3 RE (RE=La, Ce, Pr and Nd) intermetallic compounds as anodes to provide higher power density and more stable discharge performance. Especially, Mg 3 Pr alloy exhibits high discharge voltage of 0.91 V and peak power density of 54.4 mW cm−2 at 60 mA cm−2 with anodic efficiency of 60%, far better than other Mg alloys. We reveal an activation mechanism of Mg 3 RE-based anodes during discharge, which significantly accelerates mass transfer process as well as enhances discharge activity. The results improve the performance of high-power Mg-air batteries and promote the value-added application of abundant rare earth elements such as Ce and La. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
