Yang Jie Xiang, Dai Bai-Hao, Chiang Ching-Yu, Chiu I-Chia, Pao Chih-Wen, Lu Sheng-Yuan, Tsao I-Yu, Lin Shou-Tai, Chiu Ching-Ting, Yeh Jien-Wei, Chang Pai-Chun, Hung Wei-Hsuan
Institute of Materials Science and Engineering, National Central University, No. 300 Jhong-da Road, Jhongli City, Taoyuan County, 320, Taiwan, ROC.
Department of Materials Science and Engineering, Feng Chia University, No. 100 Wenhwa Road, Seatwen, Taichung, 40724, Taiwan, ROC.
ACS Nano. 2021 Jul 27;15(7):12324-12333. doi: 10.1021/acsnano.1c04259. Epub 2021 Jul 16.
Although high-entropy alloys have been intensively studied in the past decade, there are still many requirements for manufacturing processes and application directions to be proposed and developed, but most techniques are focused on high-entropy bulk materials and surface coatings. We fabricated high-entropy ceramic (HEC) nanomaterials using simple pulsed laser irradiation scanning on mixed salt solutions (PLMS method) under low-vacuum conditions. This method, allowing simple operation, rapid manufacturing, and low cost, is capable of using various metal salts as precursors and is also suitable for both flat and complicated 3D substrates. In this work, we engineered this PLMS method to fabricate high-entropy ceramic oxides containing four to seven elements. To address the catalytic performance of these HEC nanomaterials, we focused on CoCrFeNiAl high-entropy oxides applied to the oxygen-evolution reaction (OER), which is considered a sluggish process in water. We performed systematic material characterization to solve the complicated structure of the CoCrFeNiAl HEC as a spinel structure, ABO (A, B = Co, Cr, Fe, Ni, or Al). Atoms in A and B sites in the spinel structure can be replaced with other elements; either divalent or trivalent metals can occupy the spinel lattice using this PLMS process. We applied this PLMS method to manufacture electrocatalytic CoCrFeNiAl HEC electrodes for the OER reaction, which displayed state-of-the-art activity and stability.
尽管在过去十年中对高熵合金进行了深入研究，但在制造工艺和应用方向方面仍有许多需要提出和开发的要求，不过大多数技术都集中在高熵块状材料和表面涂层上。我们在低真空条件下，通过在混合盐溶液上进行简单的脉冲激光辐照扫描（PLMS法）制备了高熵陶瓷（HEC）纳米材料。这种方法操作简单、制造快速且成本低廉，能够使用各种金属盐作为前驱体，并且适用于平面和复杂的三维基底。在这项工作中，我们对这种PLMS方法进行了改进，以制备包含四到七种元素的高熵陶瓷氧化物。为了研究这些HEC纳米材料的催化性能，我们重点关注了应用于析氧反应（OER）的CoCrFeNiAl高熵氧化物，该反应在水中被认为是一个缓慢的过程。我们进行了系统的材料表征，以解析作为尖晶石结构ABO（A、B = Co、Cr、Fe、Ni或Al）的CoCrFeNiAl HEC的复杂结构。尖晶石结构中A和B位点的原子可以被其他元素取代；使用这种PLMS工艺，二价或三价金属都可以占据尖晶石晶格。我们应用这种PLMS方法制造了用于OER反应的电催化CoCrFeNiAl HEC电极，该电极表现出了先进的活性和稳定性。
