Chemical Stability of High-Entropy Spinel in a High-Pressure Pure Hydrogen Atmosphere

被引:1
|
作者
Domaradzki, Kamil [1 ]
Adamczyk, Anna [1 ]
Pyzalski, Michal [1 ]
Brylewski, Tomasz [1 ]
Nowak, Marek [2 ]
Jurczyk, Mieczyslaw [3 ]
机构
[1] AGH Univ Krakow, Fac Mat Sci & Ceram, al Mickiewicza 30, PL-30059 Krakow, Poland
[2] Poznan Univ Tech, Inst Mat Sci & Engn, Fac Mat Engn & Tech Phys, Jana Pawla II 24, PL-61138 Poznan, Poland
[3] Univ Zielona Gora, Inst Mat & Biomed Engn, Fac Mech Engn, PL-65417 Zielona Gora, Poland
关键词
high-entropy oxide; spinel structure; mechanochemical synthesis; hydrogen; MECHANOCHEMICAL SYNTHESIS; NANOPARTICLES; CO;
D O I
10.3390/ma17133309
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This paper focuses on high-entropy spinels, which represent a rapidly growing group of materials with physicochemical properties that make them suitable for hydrogen energy applications. The influence of high-pressure pure hydrogen on the chemical stability of three high-entropy oxide (HEO) sinter samples with a spinel structure was investigated. Multicomponent HEO samples were obtained via mechanochemical synthesis (MS) combined with high-temperature thermal treatment. Performing the free sintering procedure on powders after MS at 1000 degrees C for 3 h in air enabled achieving single-phase (Cr0.2Fe0.2Mg0.2Mn0.2Ni0.2)3O4 and (Cu0.2Fe0.2Mg0.2Ni0.2Ti0.2)3O4 powders with a spinel structure, and in the case of (Cu0.2Fe0.2Mg0.2Ti0.2Zn0.2)3O4, a spinel phase in the amount of 95 wt.% was achieved. A decrease in spinel phase crystallite size and an increase in lattice strains were established in the synthesized spinel powders. The hydrogenation of the synthesized samples in a high-pressure hydrogen atmosphere was investigated using Sievert's technique. The results of XRD, SEM, and EDS investigations clearly showed that pure hydrogen at temperatures of up to 250 degrees C and a pressure of up to 40 bar did not significantly impact the structure and microstructure of the (Cr0.2Fe0.2Mg0.2Mn0.2Ni0.2)3O4 ceramic, which demonstrates its potential for application in hydrogen technologies.
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页数:13
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