Laser synthesis of oxygen vacancy-modified CoOOH for highly efficient oxygen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Introducing oxygen vacancies into transition-metal oxides can enhance catalytic activity.
• Traditional methods for creating oxygen vacancies often require harsh conditions (high temperature/pressure) and multiple steps, making them inefficient and time-consuming.

Purpose of the Study:

• To develop a green, mild, and effective method for preparing transition-metal oxide nanosheets with abundant oxygen vacancies.
• To investigate the impact of oxygen vacancies and nanosheet thickness on catalytic activity for water oxidation.

Main Methods:

• Laser ablation in liquids (LAL) was employed to synthesize CoOOH nanosheets.
• Theoretical calculations and experimental analyses were used to study the properties of the synthesized materials.

Main Results:

• Successfully prepared CoOOH nanosheets with abundant oxygen vacancies and controlled thickness using LAL.
• Demonstrated that oxygen vacancies optimize intermediate absorption and improve electrical conductivity for the oxygen evolution reaction (OER).
• The thin nanosheet structure provides increased active sites, leading to excellent OER activity.

Conclusions:

• Laser ablation in liquids is a novel and efficient approach for creating oxygen vacancy-modified catalysts.
• Oxygen vacancy-rich CoOOH nanosheets exhibit enhanced performance for water oxidation.
• This strategy offers a promising pathway for developing efficient, non-noble metal catalysts for water splitting.