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  CV (Cyclic Voltammetry) Experiment

This experiment is based on the "мȭ -ȭȸ(÷)" textbook.


Cyclic Voltage current method (Cyclic Voltammetry, CV)




 Cyclic Voltammetric experiment components of WizMAC Inc.  



 Electrochemical measuring equipment

               - WizECM-800Premium (Current Range : 800mA~10nA) -













 Cyclic Voltammetry (CV) Reagent manufacturing



1) Distilled water (20 g) is prepared in the vial 34g.




2. Prepare KNO3 (2g) in a measuring spoon
(7g). (Spoon: 7g)

 The ratio of distilled water to KNO3 is
set at (20: 2) ratio.


3. Dissolve KNO3 (2 g) in distilled water
(20 g).

4. Prepare K3Fe(CN)6 (1 g).
(Spoon: 7g)
 The ratio of distilled water to KNO3 and
3Fe(CN)6 is (20: 2: 1).

5. Dissolve K3Fe(CN)6 (1g) in
distilled water (20 g) + KNO
3 (2g).

6. Distilled water(20g)+KNO3(2g)+K3Fe(CN)6(1g)

 Cyclic Voltammetry (CV) preparation for experiment 

Use the electrode supplied with the Aligator Clip
Cable supplied with the WizECM-800Premium.

Black : Couter Electrode
Green : Working Electrode
Red : Reference Electrode

 Cyclic Voltammetry (CV) experiment

e supplied with the WizECM-800Premium.

Explanation of each parameter of WizECM-800Premium
of WizMAC Inc.

1) High E The highest voltage value of Scan Voltage

2) Low E The lowest voltage value of Scan Voltage

3) Initial
 Initial voltage value of Scan Voltage

4) ScanRate   Scan Voltage Increasing voltage value  per second

5) Quiet Time  The time at which the Scan voltage
Initial Potential value is maintained (stabilization cycle time)

6) Scan Number  Number of Pattern Repetitions of Scan

7) Scan Direction  Reverse voltage sign of Scan Voltage

8) Current Range  Set the measured current value according to
the expected resistance of the material to be measured

9) Auto Current  The measured current value according to the
resistance value is automatically set

10) Save Interval  Time
to receive data

Red line : When the user
sets HighE and LowE, Applied voltage (V)

Blue line : Measured current value (A)

x axis : When the user sets HighE and LowE, Applied voltage value(V)

Y axis : Measured current value (A)

 CV measured according to Scanning speed (WizMAC
parameter name: Scanrate) change

Scan Rate 50mV/s

Scan Rate 100mV/s

Scan Rate 200mV/s

Scan Rate 300mV/s

Scan Rate 400mV/s

Scan Rate 500mV/s

 Reason of Why the graph type differs according to the
scan rate value

Some graph types are different depending on the scan rate. This is because the higher the scanrate, the faster the plotting speed.
The reason why the scanrate changes quickly is that the graph shape changes because it takes a minimum of time for the reaction to take place in a chemical reaction experiment with oxidation and reduction species. However, if the scanrate is very fast, the graph is plotted in relation to the reaction rate and concentration of the ions involved in the reaction. The principle of plotting this graph is to apply constant voltage one by one and observe the current accordingly. However, the process is very fast and the graph is drawn.
In other words, if the scanrate is very fast, even the time taken for each one is very fast so that the distribution and concentration of the ions are different at the interface for a short time, and the scanrate is different from the graph afterwards.
When you measure the CV later, you should analyze the graph by setting the appropriate scanrate value.