Yao Yuechao, Li Zhangjian, Dou Yibo, Jiang Tao, Zou Jizhao, Lim Sung Yul, Norby Poul, Stamate Eugen, Jensen Jens Oluf, Zhang Wenjing
Department of Environmental and Resource Engineering, Technical University of Denmark, Miljøvej 115, Kgs. Lyngby, 2800, Denmark.
Shenzhen Key Laboratory of Special Functional Materials & Shenzhen Engineering Laboratory for Advance Technology of Ceramics, College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, PR China.
Dalton Trans. 2023 Mar 28;52(13):4142-4151. doi: 10.1039/d2dt03637a.
High entropy alloys (HEAs) with a tunable alloy composition and fascinating synergetic effects between various metals have attracted significant attention in the field of electrocatalysis, but their potential is limited by inefficient and unscalable fabrication methodologies. This work proposes a novel solid-state thermal reaction method to synthesise HEA nanoparticles encapsulated in an N-doped graphitised hollow carbon tube. This facile method is simple and efficient and involves no use of organic solvents during the fabrication process. The synthesized HEA nanoparticles are confined by the graphitised hollow carbon tube, which is possibly beneficial for preventing the aggregation of alloy particles during the oxygen reduction reaction (ORR). In a 0.1 M KOH solution, the HEA catalyst FeCoNiMnCu-1000(1 : 1) exhibits an onset and half-wave potential of 0.92 V and 0.78 V ( RHE), respectively. We assembled a Zn-Air battery with FeCoNiMnCu-1000 as a catalyst for the air electrode, and a power density of 81 mW cm and a long-term durability of >200 h were achieved, which is comparable to the performance of the state-of-the-art catalyst Pt/C-RuO. This work herein offers a scalable and green method for synthesising multinary transition metal-based HEAs and highlights the potential of HEA nanoparticles as electrocatalysts for energy storage and conversion.
具有可调节合金成分以及各种金属之间迷人协同效应的高熵合金（HEAs）在电催化领域引起了广泛关注，但其潜力受到低效且不可扩展的制备方法的限制。这项工作提出了一种新颖的固态热反应方法来合成封装在氮掺杂石墨化空心碳管中的高熵合金纳米颗粒。这种简便的方法简单高效，在制备过程中不使用有机溶剂。合成的高熵合金纳米颗粒被石墨化空心碳管限制，这可能有利于在氧还原反应（ORR）过程中防止合金颗粒聚集。在0.1 M KOH溶液中，高熵合金催化剂FeCoNiMnCu - 1000(1∶1)的起始电位和半波电位分别为0.92 V和0.78 V（相对于可逆氢电极）。我们组装了一个以FeCoNiMnCu - 1000作为空气电极催化剂的锌空气电池，实现了81 mW cm的功率密度和大于200 h的长期耐久性，这与最先进的催化剂Pt/C - RuO的性能相当。本文的这项工作提供了一种可扩展的绿色方法来合成多组分过渡金属基高熵合金，并突出了高熵合金纳米颗粒作为用于能量存储和转换的电催化剂的潜力。
