Overoxidation of Intrinsically Conducting Polymers

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Intrinsically conducting polymers (ICPs) are susceptible to degradation under oxidizing conditions or high electrode potentials, a process termed overoxidation.
• Overoxidation can alter molecular structure and material properties, impacting ICP performance in various applications.
• The mechanisms of overoxidation are linked to reversible redox processes used in energy conversion and electrochromism.

Purpose of the Study:

• To review and interpret published examples and experimental observations of overoxidation in intrinsically conducting polymers.
• To discuss the structural and material property changes associated with overoxidation.
• To present strategies for mitigating overoxidation and highlight its beneficial applications.

Main Methods:

• Literature review of published studies on overoxidation in intrinsically conducting polymers.
• Analysis of experimental observations regarding structural and property changes.
• Compilation of methods to limit or suppress overoxidation.

Main Results:

• Overoxidation significantly alters ICPs' molecular structure and material properties, with effects varying by experimental conditions and chemical environment.
• While detrimental in many cases, leading to material degradation, overoxidation can be beneficial for specific applications like sensors and surface functionalization.
• Related redox processes can occur at lower potentials, influencing degradation rates.

Conclusions:

• Overoxidation is a critical factor affecting the stability and performance of intrinsically conducting polymers.
• Strategies exist to control and potentially leverage overoxidation for advanced material applications.
• Further research into managing overoxidation is crucial for developing durable and efficient polymer-based devices.