Size-Controlled Cobalt Nanoplates and Their Impact on Oxygen Evolution Catalysis.

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Controlling nanoparticle size is crucial for optimizing catalytic activity and electronic properties.
• Achieving precise size control in two-dimensional (2D) nanostructures presents significant challenges.

Purpose of the Study:

• To demonstrate precise size control of cobalt nanoplates.
• To investigate the influence of nanoplate dimensions on catalytic performance in the oxygen evolution reaction (OER).

Main Methods:

• Synthesis of cobalt nanoplates with tunable sizes (19 nm to 80 nm).
• Adjustment of surfactant ratios during synthesis to achieve size control.
• Evaluation of catalytic activity for the oxygen evolution reaction.

Main Results:

• Precise size control of cobalt nanoplates was successfully achieved by varying surfactant ratios.
• The 19 nm cobalt nanoplates exhibited superior oxygen evolution reaction activity compared to larger ones.
• Higher activity in smaller nanoplates is attributed to a greater proportion of {10-bar{1}1} to {0001} facets.

Conclusions:

• Tuning surfactant ratios offers a viable method for precise size control of cobalt nanoplates.
• Nanoplate size significantly impacts catalytic performance in the oxygen evolution reaction.
• This study provides valuable structure-activity relationship insights for cobalt nanocatalysts.