Interfacial Water

Dissecting the electrical double layer

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Science  14 Nov 2014:
Vol. 346, Issue 6211, pp. 822-824
DOI: 10.1126/science.346.6211.822-m

The structure of water within a nanometer of an electrode surface is known as the electrical double layer. This layer creates a strong electrical field that can affect electrochemical reactions. Velasco-Velez et al. explored the structure of the electrical double layer at a bare gold electrode. With no applied potential and at positive potentials, the layer is highly structured (resembling ice) with few dangling hydrogen bonds. However, at negative potentials, the layer was more like bulk water, and half of the water molecules lie flat on the surface.

Science, this issue p. 831

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