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. 2019 Aug 20;13:808. doi: 10.3389/fnins.2019.00808

Figure 2.

Figure 2

Different electrochemical methods (A) Amperometry: where a constant potential difference is applied between the working electrode (WE) and reference electrode (RE). The current between the WE and counter electrode (CE) is monitored as is an indication of the analyte concentration as the reaction progresses. (B) Cyclic Voltammetry: The potential difference between the WE, RE is changed periodically and the current between WE and CE is monitored. (C) Impedance Spectroscopy: Based on the modality, the impedance of an analyte is measured based on voltage applied between WE, RE and the current through CE. (D) Potentiometry: The potential difference between WE and RE is measured without applying any external potential difference.