Open Circuit Potential (OCP)
Open Circuit Voltage (OCV) is the same as Open Circuit Potential (OCP). This is the potential where no current is flowing, because the circuit is open.
Between two metals in the same solution the OCP is the highest potential difference possible without applying a potential from the outside. Measuring the OCP is also non-invasive, because no current is flowing.
See also the chapters on Corrosion Potential and Constant Potential vs OCP or vs Reference Electrode.
Articles
Constant Potential vs OCP or vs Reference Electrode
In this section the reasons for choosing a certain DC potential is explained. The advantages of using Ecorr as a reference point will be presented as well as how to choose in PSTrace to use potentials versus the reference electrode or versus Ecorr.
Corrosion Potential
In this chapter the Open Circuit Potential (OCP) and the Corrosion Potential are introduced. The principles of reference electrodes as well as the 0 V by convention potential of the standard hydrogen electrode (SHE) are explained.
Open Circuit Potential measurements with a MUX8-R2
The multiplexer MUX8-R2 offers the possibility to record reliable Open Circuit Potential (OCP) measurements in the Alternate mode, which allows to monitor the OCP of multiple samples over time with a single potentiostat. In this application note it is demonstrated how to setup and perform an OCP measurement with the MUX8-R2 in the Alternate mode.