Local visualization of catalytic activity at gas evolving electrodes using frequency-dependent scanning...

Area of Science:

• Electrochemistry
• Materials Science
• Energy Technology

Background:

• Gas evolving electrodes are crucial for energy applications.
• Understanding active sites and gas bubble dynamics is key for electrode development.
• Current characterization methods may lack spatial resolution for these processes.

Purpose of the Study:

• To introduce a novel concept for localized characterization of gas evolving electrodes.
• To utilize scanning electrochemical microscopy (SECM) for this purpose.
• To gain insights into active catalytic site distribution and gas bubble departure dynamics.

Main Methods:

• Employing scanning electrochemical microscopy (SECM) for localized analysis.
• Characterizing spatial distribution of catalytic activity.
• Investigating dynamic characteristics of gas-bubble departure.

Main Results:

• Successfully mapped the spatial distribution of predominant active catalytic sites.
• Provided information on the dynamic characteristics of gas-bubble departure.
• Demonstrated the capability of SECM for detailed electrode surface analysis.

Conclusions:

• The proposed SECM concept enables localized characterization of gas evolving electrodes.
• This technique is critical for assessing and developing new electrode materials.
• Understanding bubble departure dynamics aids in optimizing electrode performance for energy applications.