Local Degradation of PEDOT:PSS on Silicon Nanostructures Using Scanning Electrochemical Microscopy

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Conducting polymers are promising for micro-electrochemical energy storage (MEES).
• Characterization of nanostructured conducting polymer electrodes requires advanced techniques.
• Existing methods for studying polymer degradation are time-consuming.

Purpose of the Study:

• Introduce scanning electrochemical microscopy (SECM) for in situ characterization of conducting polymer electrodes.
• Utilize SECM to accelerate the degradation studies of conducting polymers.
• Develop a model to understand and quantify the degradation rate of polymer electrodes.

Main Methods:

• Employing SECM in feedback mode with approach curves and chronoamperometry.
• Analyzing PEDOT:PSS electrodes on various silicon nanostructures (flat Si, SiNWs, SiNTrs).
• Utilizing Comsol Multiphysics for degradation rate modeling.

Main Results:

• SECM enables in situ characterization of conducting polymer electrodes.
• Accelerated degradation of polymer samples achieved in thousands of seconds.
• Degradation rate modeled with constants A0 and time constant τ.

Conclusions:

• SECM is a valuable technique for studying conducting polymer electrodes in MEES.
• The SECM-based degradation method significantly shortens experimental durations.
• The developed model enhances understanding of polymer electrode degradation mechanisms.