Algan Simsek Irem B, Badr Hussein O, Cardoza Neal, Colin-Ulloa Erika, Schwenk Gregory R, Sudhakar Kaustubh, Wiedwald Ulf, Farle Michael, Kalra Vibha, Ibrahim Mohamed A, Titova Lyubov V, Barsoum Michel W
Department of Metallurgical and Materials Engineering, Gazi University, Ankara 06560, Turkey.
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
ACS Omega. 2025 Aug 25;10(35):39530-39539. doi: 10.1021/acsomega.5c00902. eCollection 2025 Sep 9.
High entropy oxides (HEOs) have recently attracted increasing attention due to their remarkable properties and relatively low cost. Herein we report a simple, highly scalable, and low temperature method for synthesizing spinel (FeNiCoCuZn)O (HEO). We heated an aqueous solution containing divalent cations in high alkali environments to temperatures of 25 - 95 °C for 24 h under atmospheric pressure. The HEO, synthesized at 95 °C for 24 h in 1 M KOH, was paramagnetic at room temperature, with a magnetic mass susceptibility of χ = (7.5 ± 0.2) × 10 m·kg. It demonstrated stable electrochemical lithium storage performance, with a gravimetric capacity of ∼300 mAh·g at 100 mA·g . It was also active in the electrocatalytic oxygen evolution reaction with an overpotential of 460 mV in alkaline media. The band gap energies were in the range of 2.4 eV. Our advancement in the synthesis and processing of transition metal-based HEOs will undoubtedly render them a viable solution for next generation materials for energy production and storage.
高熵氧化物（HEOs）因其卓越的性能和相对较低的成本，近来受到越来越多的关注。在此，我们报道一种简单、高度可扩展且低温的合成尖晶石（FeNiCoCuZn）O（HEO）的方法。我们在高碱环境中将含有二价阳离子的水溶液在大气压下加热至25 - 95 °C并保持24小时。在1 M KOH中于95 °C合成24小时的HEO在室温下呈顺磁性，其质量磁化率χ = (7.5 ± 0.2) × 10 m·kg 。它展现出稳定的电化学锂存储性能，在100 mA·g 时的比容量约为300 mAh·g 。它在碱性介质中的析氧电催化反应中也很活跃，过电位为460 mV。其带隙能量在2.4 eV范围内。我们在过渡金属基HEOs的合成与加工方面取得的进展无疑将使其成为下一代能源生产和存储材料的可行解决方案。
