Unveiling micro- and nanoscale bubble dynamics for enhanced electrochemical water splitting

Area of Science:

• Physical Chemistry
• Materials Science
• Chemical Engineering

Background:

• Bubbles in water splitting (electrochemical and photoelectrochemical) significantly impact system efficiency.
• Surface-attached bubbles reduce the electrocatalytically active electrode area, increasing overpotential and hindering performance.
• Optimizing water splitting requires a deep understanding of bubble nucleation, growth, coalescence, and detachment.

Purpose of the Study:

• To review fundamental mechanisms of bubble evolution during water splitting.
• To emphasize the role of the Marangoni effect in bubble dynamics.
• To highlight scale-dependent bubble behavior on micro- and nano-electrodes.

Main Methods:

• Literature review focusing on fundamental mechanisms and recent advancements.
• Analysis of gas-liquid interfacial phenomena and bubble dynamics.
• Exploration of scale-dependent bubble behavior on micro/nano-electrodes.

Main Results:

• Bubble evolution, including nucleation, growth, coalescence, and detachment, is critical for water splitting efficiency.
• The Marangoni effect significantly influences bubble dynamics and behavior.
• Scale-dependent bubble behavior on micro/nano-electrodes provides insights into interfacial phenomena.

Conclusions:

• Effective bubble removal is pivotal for optimizing electrolysis processes.
• Understanding bubble dynamics offers opportunities to enhance water splitting performance.
• Insights into gas-liquid interfacial phenomena are crucial for industrial applications.