Surface charge modulation boosts electrocatalytic water splitting over iridium catalysts on a polyimide support

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient catalysts for the acidic oxygen evolution reaction (OER) is crucial for energy applications.
• Minimizing the use of precious metals like iridium (Ir) in OER catalysts is an ongoing challenge.

Purpose of the Study:

• To develop a high-performance OER catalyst using minimal iridium.
• To investigate the role of a polyimide support in enhancing OER activity.

Main Methods:

• Synthesis of iridium nanoparticles supported on a polyimide material.
• Electrochemical characterization of the catalyst's performance in acidic media.

Main Results:

• The iridium/polyimide catalyst demonstrated high performance for the oxygen evolution reaction.
• The polyimide support modulated the electronic structure of iridium, lowering thermodynamic barriers.
• The support also increased local proton concentration, boosting OER rates.

Conclusions:

• The developed iridium/polyimide catalyst offers a promising solution for efficient and cost-effective acidic OER.
• Polyimide supports can be effectively utilized to enhance the activity of precious metal catalysts.