Our new method

A very simple technique has been developed at ACM for improving noisy cells.

The Experiment:  WE is 1 cm² of Ti AE is 2cm² of Pt and RE is SCE via a lugin probe and electrolyte bridge.  The electrolyte is 1L of  water with a gram of NaCl.  AC Impedance from 30Khz to 0.01Hz with a perturbing amplitude of 10mV.  The results are shown in green below.  Massive scatter is observed due to a very low signal to noise ratio.

Coupling a further Pt electrode to the RE via a 1µF capacitor produces no shift in rest potential and results in the smooth red curve below.    The second Pt electrode appears to offer a common mode path for the induced noise.  ACM Instruments manufacture and sell this fourth electrode in a convenient ready made form.