dc.description.abstract | The field of high-entropy alloys has been studied for only about twenty years, and there are still many manufacturing processes and application directions to be developed. Our research has developed a series of processes based on the theoretical basis of high-entropy alloys, called pulsed-laser-irradiation scanning on mixed-salt solutions.
The product of our process is high-entropy ceramic nanoparticle film. The main objective of our research is mainly the CoCrFeNiAl metal salt product of the nitrate precursor. For this emerging material, a systematic parameter tests are carried out, analyzed and applied, showing that there are the characteristics of simple operation, fast manufacturing, low cost, high specific surface area, high product design freedom and ability of pattern.
The combination of variable parameters in the process is the number of laser repetitive scans, the volume of the precursor, the type of precursor salt, and the type of substrate. The finished product is performed a series of analysis, such as the microstructure of the electron microscope, X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS) for elemental composition and crystal structure analysis of the photoelectron spectrometer to repeatedly verified the material characteristics and trends of the high-entropy ceramic nanoparticle film.
XRD analysis of synchrotron radiation proves that this material is a high-entropy ceramic nanoparticle with a spinel structure, A3O4、AB2O4(A, B = Co, Cr, Fe, Ni or Al). A site and B site in the spinel structure can be replaced by other elements, so divalent or trivalent metals can be occupied in the spinel by this process, which will affect the traditional structure impression of high-entropy ceramic nanoparticle catalysis.
On the other hand, high-entropy ceramics were fabricated to improve both the electrocatalytic activity and stability. 400 mA/cm2 is a standard current requirement for the industrial application and our CoCrFeNiAl HECs can run under such high current density for more than 150hrs without obvious decay.
Due to the synergistic effect between the functionalized carbon and high-entropy ceramics (HECs), this closed system successfully demonstrated a 100% removal of Methyl Orange (MO)within 90 minutes of operation, and the open circulation system demonstrated a 100% removal of Methyl Orange (MO) within minutes of 150 operation. | en_US |