Electrochemical studies on ion transport in gels with scanning electrochemical microscopy

Article Abstract:

A study was conducted to analyze the ion transport characteristics of two gels made from polyacrylate and polyacrylamide using scanning electrochemical microscopy (SECM). A platinum microdisk was utilized as the SECM tip while a platinum wire was used as a quasi-reference electrode. Results indicated that the transient SECM response can be utilized to obtain the diffusion coefficient of a redox species from the critical transient time as a function of tip displacement.

Colloids, Electrochemistry

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Probing ion transfer at the liquid/liquid interface by scanning electrochemical microscopy (SECM)

Article Abstract:

A study was conducted to characterize a novel way of utilizing scanning electrochemical microscopes (SECM) to analyze ion transfer reactivity of the liquid/liquid and liquid/membrane interfaces. A Sutter Model P-2000 laser-based puller was utilized to obtain pipets from borosilicate capillaries. The pipet tip was then biased to realize a SECM approach curve. Results indicated the effectiveness of the approach in imaging solid/liquid and liquid/liquid interfaces.

Ions, Surface chemistry

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Scanning electrochemical microscopy imaging by means of high-frequency impedance measurements in feedback mode

Article Abstract:

A specific measurement technique and a calibration procedure are employed to estimate fast variations of the high-frequency impedance of ultramicroelectrodes (UME) under potential control. The technique allows real-time electrolyte-resistance Re measurements from an analogue signal, the amplitude of which is inversely proportional to the modulus of the UME impedance.

Electric properties, Electrolytes, Electrodes

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