For the first time, scientists have observed the formation of a double electric layer in a liquid—a critical boundary for the function of batteries, capacitors, and biological cells. The process, which unfolds in less than a picosecond (10⁻¹² seconds), was captured using a powerful infrared laser, paving the way for advances in energy storage technologies.
A double electric layer forms when a negatively charged electrode surface comes into contact with a liquid, attracting positive ions (like H₃O⁺) to create a dense first layer, followed by a second layer of negative ions for charge neutralization. The researchers increased the ion concentration by adding acid to water, then used a laser pulse to temporarily push the ions away and track their return.
The experiment revealed how quickly the layer re-forms, offering valuable insight into electrochemical processes. This could lead to more efficient batteries and supercapacitors, where the double layer is essential for charge storage. Interestingly, the same method may also aid in studying biological membranes, where similar layers regulate ion transport.
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