Molten salt synthesis of high-entropy alloy AlCoCrFeNiV nanoparticles for the catalytic hydrogenation of p-nitrophenol by NaBH4
Molten salt synthesis of high-entropy alloy AlCoCrFeNiV nanoparticles for the catalytic hydrogenation of p-nitrophenol by NaBH4
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DOI：
10.1016/j.ijhydene.2021.10.260
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发表时间：
2022-01-12
影响因子：
7.2
通讯作者：
Shoji, Ryo
中科院分区：
文献类型：
--
作者：
Kobayashi, Yasukazu;Suzuki, Daisuke;Shoji, Ryo
采用熔盐法在无电源条件下以氧化物前驱体为原料制备了高熵合金（HEA）AlCoCrFeNiV纳米颗粒。氧化物前体在熔融LiCl中在600 ℃-700 ℃或熔融LiCl-CaCl 2中在500 ℃-550 ℃被CaH 2还原剂直接还原。当在700 ℃下进行还原时，产生面心立方（FCC）结构，如通过X射线衍射分析所鉴定的。随着还原温度的降低，FCC结构消失，取而代之的是体心立方（BCC）结构。在550 ℃的还原温度下，所得样品由具有15 nm BCC结构的高纯HEA AlCoCrFeNiV纳米颗粒组成。通过扫描电子显微镜/透射电子显微镜与能量色散X射线光谱的分析证实了具有纳米级形态的均匀HEA AlCoCrFeNiV的形成。在对硝基苯酚的NaBH 4加氢反应中，AlCoCrFeNiV纳米颗粒（在550 ℃下制备）表现出类似于90%转化率和16 kJ/mol活化能的催化活性。(C)2021年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
High-entropy alloy (HEA) AlCoCrFeNiV nanoparticles were prepared from oxide precursors using a molten salt synthesis method without an electrical supply. The oxide precursor was directly reduced by CaH2 reducing agent in molten LiCl at 600 degrees C-700 degrees C or molten LiCl-CaCl2 at 500 degrees C-550 degrees C. When the reduction was conducted at 700 degrees C, a face-centered cubic (FCC) structure produced, as identified by X-ray diffraction analysis. With lower reduction temperatures, the FCC structure was absent, replaced by a body-centered cubic (BCC) structure. With a reduction temperature of 550 degrees C, the resulting sample was composed of highly pure HEA AlCoCrFeNiV nanoparticles with a BCC structure of 15 nm. Analyses by scanning electron microscopy/transmission electron microscopy with energy-dispersive X- ray spectroscopy confirmed the formation of homogeneous HEA AlCoCrFeNiV with a nanoscale morphology. In the hydrogenation reaction of p-nitrophenol by NaBH4, the AlCoCrFeNiV nanoparticles (produced at 550 degrees C) exhibited a catalytic activity with similar to 90% conversion and 16 kJ/mol activation energy. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.