Pseudocapacitance: From Fundamental Understanding to High Power Energy Storage Materials

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Global demand for high power and energy density electrochemical storage is critical.
• Pseudocapacitive materials utilize reversible Faradaic reactions for charge storage, overcoming limitations of traditional capacitors and batteries.
• Significant advancements in understanding pseudocapacitance and relevant materials have occurred over the past decade.

Purpose of the Study:

• To review the fundamental development of pseudocapacitance as a concept in electrochemical energy storage.
• To trace the rise of pseudocapacitance in the field.
• To introduce and describe novel material classes exhibiting pseudocapacitive behavior.

Main Methods:

• Literature review of pseudocapacitance.
• Analysis of fundamental electrochemical principles.
• Categorization of emerging pseudocapacitive materials.

Main Results:

• Pseudocapacitance offers a pathway to surpass energy density limits of supercapacitors and power density limits of batteries.
• A growing portfolio of materials exhibiting pseudocapacitive charge storage has been identified.
• The understanding of pseudocapacitive mechanisms has significantly matured.

Conclusions:

• Pseudocapacitive materials are key to developing next-generation electrochemical energy storage systems.
• Continued research into new pseudocapacitive materials will drive innovation in energy storage technology.
• This review provides a foundational understanding and overview of pseudocapacitive materials for researchers.