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Electroanalytical Chemistry for Energy & Sustainability
"Decoding charge transfer at diverse interfaces"
Most physical and chemical phenomena in the material world are fundamentally governed by the behavior of charges, including electrons and ions. Electrochemistry, the study of charge transfer and transport at interfaces, offers a powerful framework for investigating natural phenomena and driving scientific progress, especially in energy and sustainability (e.g., energy storage and conversion). Despite its versatility and strength, major challenges remain that cannot be easily addressed by traditional electrochemical approaches, which typically focus on electrified interfaces and systems at equilibrium or steady state.
The Han Group seeks to expand the boundaries of electrochemistry by developing innovative electroanalytical methods with broader capabilities, extending electrochemical insight even to non-electrified interfaces and dynamic systems. Our approach combines electrochemical techniques, centered on advanced impedance methods but extending beyond them, with diverse skillsets such as chemical and materials synthesis, device fabrication, materials characterization, and instrumentation. Through these advances, we seek to uncover interfacial processes critical to addressing emerging challenges in energy and sustainability.
Our research spans three primary areas:
Energy Storage
Energy Storage
One of the key analytical challenges in advancing next-generation batteries is to track and predict the aging behavior of electrode–electrolyte interfaces, particularly during device operation. Our group develops advanced in situ and operando electrochemical diagnostic frameworks for battery systems by leveraging large-scale, time-resolved impedance datasets obtained via Fourier transform electrochemical impedance spectroscopy (FTEIS).
Energy Conversion
Energy Conversion
Energy production and conversion technologies fundamentally rely on chemical transformations involving charge transfer (i.e., electrons and ions) across various interfaces. Our group aims to extend the boundaries of electrochemistry in energy conversion beyond conventional electrified systems, such as fuel cells and electrolyzers. In particular, we envision utilizing electrochemistry to better understand and harness geochemical energy production at rock–water interfaces.
Chemical Analysis
Chemical Analysis
Obtaining comprehensive chemical information from complex samples in a simple, low-cost, and accurate manner is a critical analytical capability for energy applications (e.g., energy conversion technologies) as well as for practical sensing applications. Our group aims to achieve this capability within a single device by leveraging the multidimensional information encoded in impedance responses at material–electrolyte interfaces.
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