A top-down strategy for amorphization of hydroxyl compounds for electrocatalytic oxygen evolution.

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Amorphous materials possess unique properties but face fabrication challenges.
• Controllable synthesis of amorphous oxides is crucial for advanced applications.

Purpose of the Study:

• To develop a versatile top-down strategy for fabricating amorphous oxides.
• To investigate the structural evolution and catalytic performance of these materials.

Main Methods:

• Top-down amorphization of various hydroxides (unitary, binary, ternary) via thermal treatment.
• Detailed characterization using techniques like X-ray diffraction and spectroscopy.
• Computational simulations including density functional theory (DFT) and molecular dynamics (MD).

Main Results:

• Successful amorphization of hydroxides into oxides by altering coordination environments (M-OH to M-O).
• Optimal amorphous oxide (FeCoSn(OH)₆-300) showed a 39.4-fold increase in oxygen evolution reaction (OER) activity.
• DFT and MD simulations elucidated the amorphization mechanism and enhanced catalytic performance.

Conclusions:

• The developed top-down strategy offers a controllable route to amorphous oxides.
• Amorphous oxides exhibit significantly enhanced OER activity, driven by structural changes.
• This work facilitates further research and applications of amorphous materials in catalysis.