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Advanced energy storage with nanostructures

Electrochemical properties for developing advanced energy storage

Electrochemical behavior such as charge density and ion transfer can characterize electrochemical reaction performance for energy storage, double layer capacitors, etc. Various nanocomposite structures have been used as electrodes to enhance electrochemical performance. Understanding the surface morphology of solid electrodes is important for designing better electrochemical devices such as electrochemical double layer capacitors, batteries, fuel-cells, and sensors. By manipulating the surface morphology, it is possible to enhance the kinetics of electrochemical reactions at the interface between the electrode and electrolyte solution. One of the major factors affecting the kinetics of an electrochemical reaction is ion transfer at the interface of an electrode and the electrolyte. Improving ion (or charge) transfer can enhance the performance of electrochemical devices. However, modifying the surface of electrodes continues to be a major challenge. Increasing the surface area of electrodes through surface modification makes it possible to reduce their resistance. This can boost ion transfer by making the redox behavior more reactive at the interface. We have established a new concept of effective surface area (an important parameter in explaining and optimizing ion transfer for optimal energy storage), namely by using metallic nanohoneycomb electrodes. We will focus our research on developing highly efficient nanocomposite electrodes using self-assembly techniques such as anodizing and LbL assembly. We plan to build on existing knowledge to develop devices and processes capable of patterning the various nanocomposite electrodes with improved textured surface modeling techniques. This will be useful for the design and optimization of nanocomposites as material for enhanced ion transfer electrodes and membranes for advanced energy storage.

S. Kim et. al., Journal of The Electrochemical Society, 2014

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