Study on the mechanism of pseudocapacitor energy storage

How can pseudocapacitive materials provide high power and high energy density?

There is an urgent global need for electrochemical energy storage that includes materials that can provide simultaneous high power and high energy density. One strategy to achieve this goal is with pseudocapacitive materials that take advantage of reversible surface or near-surface Faradaic reactions to store charge.

How important is charge storage in A pseudocapacitor?

Overall, in-depth understanding of the fundamental charge storage mechanism in the pseudocapacitance process is extremely essential to design pseudocapacitor electrode materials and device structures, as well as to improve the energy density and cycling stability of pseudocapacitors, there is still much work to be done.

What is the charge storage mechanism of pseudocapacitive materials?

The charge-storage mechanisms of pseudocapacitive materials are based on battery-like redox reactions, which occur at rates comparable to that of electrical double-layer charge storage in capacitive materials, and display an electrochemical response similar to that of a capacitor.

What role do pseudocapacitive materials play in the future energy landscape?

Finally, we provide our perspective on the role of pseudocapacitive materials in the future energy landscape. A Li-ion battery material stores charge through diffusion-limited, faradaic reactions throughout the bulk of the active material.

Why do pseudocapacitive materials store a higher charge?

Even if the charge discharge is for a short period (> a few minutes), such materials will store a higher charge. Peak separations in pseudocapacitive materials can be caused by an ohmic loss at high rates . From the CV and GCD analysis, the pseudocapacitive and battery-like behavior are more evident and obvious.

What is pseudocapacitance in electrochemistry?

Materials that exhibit pseudocapacitance sustain electrochemical reactions that are fast and reversible, giving an intermediate energy storage performance compared to EDLCs and batteries . Pseudocapacitive processes are not limited to the electrode surface but can sometimes penetrate deep into the bulk material .