The Electrochemical Double Layer (IMAGE)

DOE/Lawrence Berkeley National Laboratory

The Electrochemical Double Layer

Caption

This stylized representation shows an electrochemical double layer, the heart of solid/liquid chemical interactions such as those occurring around a battery's electrode. An experiment at Berkeley Lab used X-rays to study the properties of the double layer that formed as positively or negatively charged particles (ions, shown as plus and minus symbols) were drawn to a gold electrode (left). The experiment featured neutrally charged pyrazine molecules (dark blue) suspended in the water-based electrolyte, composed of potassium hydroxide. Researchers precisely measured changes in the charge properties of molecules caused by changes to the electric charge applied to the electrode and to the ion concentration of the electrolyte in the double-layer region.

Credit

Zosia Rostomian/Berkeley Lab

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