Chronoamperometry

Chronoamperometry applies a constant voltage to the device under test (DUT). This causes current flow through the DUT. The current is measured over time at a defined sampling rate. If the potentiostat is switched off before starting chronoamperometry, a start phase is added in which the potentiostat is switched on at the current OCV and ramps at a defined scan rate (∆E/∆t) to the set DC potential E_dc. A maximum measurement time (t_max) is defined for the chronoamperometry to ensure the measurement is deterministic.

After a holding time (t_hold), the chronoamperometry can be terminated early when a defined current stability state is reached or a current limit I_min/I_max is exceeded.

Parameter Description

Parameter	Name	Description	Unit
E dc	DC potential	constant polarization voltage	V
t max	runtime	maximum runtime of the chronoamperometry	s
ODR	output data rate	number of measurement points per second note: the current is always measured at the maximum possible speed and integrated for the selected data rate	\(\frac{1}{s}\)
I range	current range (abs)	optional fixed current range selection if autoranging is disabled	A
Stability	\(\frac{|∆I|}{∆t}\)	current stabilization criterion for early termination of the CA	\(\frac{A}{s}\)
t hold	hold time	time window from the start of the CA in which the termination criterion do not yet apply (minimum runtime)	s
I min	minimum current	minimum current limit for premature determination	A
I max	maximum current	maximum current limit for premature determination	A

A Start Phase Potentiostatic can be enabled or disabled before the method is executed.

Measurement Result

The voltage and current curves are recorded as a function of time. Additional measurement signals are also recorded when activated.

Custom Experiment Builder

This experiment is a combination of the following blocks:

• Open Circuit Measurement

• Ramp - Current Voltage Curve

• Polarization