Wang Min, Liu Baolin, Zhang Hongyu, Lu Zhenjiang, Xie Jing, Cao Yali
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China.
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China.
J Colloid Interface Sci. 2024 May;661:681-689. doi: 10.1016/j.jcis.2024.01.180. Epub 2024 Feb 1.
Building efficient and stable bifunctional electrocatalysts toward oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is crucial for the advancement of rechargeable zinc-air batteries (ZABs). Here, a convenient in situ strategy is reported to controllably encapsulate CoFe alloy nanoparticles within N-doped carbon nanotubes (CoFe@NCNT). The abundant Co(Fe)-N active sites and the synergistic interaction between CoFe alloys and carbon nanotubes facilitate mass transfer and interfacial charge transfer, resulting in excellent dual functional electrocatalytic activity of OER/ORR with minor potential difference (ΔE = 0.73 V). Thus, the corresponding rechargeable ZAB displays high power density (194 mW cm), excellent specific capacity (795 mAh g), and favorable stability (900 cycles@5 mA cm). This work provides an approach for establishing low-cost bultifunctional electrocatalysts with excellent performance of non-noble metal nanoalloys.
构建高效稳定的双功能电催化剂用于析氧反应（OER）和氧还原反应（ORR）对于可充电锌空气电池（ZAB）的发展至关重要。在此，报道了一种简便的原位策略，可将CoFe合金纳米颗粒可控地封装在氮掺杂碳纳米管（CoFe@NCNT）中。丰富的Co(Fe)-N活性位点以及CoFe合金与碳纳米管之间的协同相互作用促进了传质和界面电荷转移，从而产生了具有微小电位差（ΔE = 0.73 V）的优异双功能电催化活性的OER/ORR。因此，相应的可充电ZAB显示出高功率密度（194 mW cm）、优异的比容量（795 mAh g）和良好的稳定性（5 mA cm下900次循环）。这项工作为建立具有非贵金属纳米合金优异性能的低成本双功能电催化剂提供了一种方法。
