Rapid Joule-Heating Synthesis for Manufacturing High-Entropy Oxides as Efficient Electrocatalysts

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• High-entropy oxides (HEOs) offer potential in physics, mechanics, energy storage, and catalysis.
• Traditional synthesis methods limit rapid screening and elemental diversity of HEOs.

Purpose of the Study:

• To develop a rapid synthesis technique for HEOs.
• To explore novel elemental combinations in HEOs.
• To investigate the catalytic properties of newly synthesized HEOs.

Main Methods:

• Rapid Joule-heating of nickel foil for HEO synthesis.
• Synthesis of high-entropy rocksalt oxides (HERSO), spinel oxides (HESO), and perovskite oxides (HEPO).
• Experimental and theoretical evaluation of OER activity.

Main Results:

• Successfully synthesized HERSO, HESO, and HEPO using Joule-heating in seconds.
• Demonstrated new elemental combinations for HERSO.
• Achieved enhanced oxygen evolution reaction (OER) activity in synthesized HERSO.

Conclusions:

• Joule-heating offers a rapid and versatile method for HEO synthesis.
• New HERSO compositions show significant promise for catalysis.
• This approach broadens the scope for developing advanced high-entropy materials.