Cyclic voltammetry (CV) is often the first electrochemical technique students and researchers encounter, and for good reason. It is simple to perform, provides a wealth of information about electrochemical systems, and produces an immediately recognisable voltammogram.
In this article, we'll demonstrate how to measure the cyclic voltammetry of a ferricyanide solution using the SenseItAll Potentiostat, a Carbon 501 screen-printed electrode (SPE), and just 50 µL of sample.
Why Ferricyanide?
The ferricyanide/ferrocyanide redox couple is one of the most widely used systems in electrochemistry education and research.
Its popularity stems from several advantages:
- ✅ Well-understood electrochemical behaviour
- ✅ Highly reproducible results
- ✅ Clear oxidation and reduction peaks
- ✅ Excellent for demonstrating diffusion-controlled processes
- ✅ Suitable for teaching and instrument validation
For this demonstration, we use a ready-made ferricyanide solution:
🧪 Potassium Hexacyanoferrate (Ferricyanide) Solution
https://shop.zimmerpeacock.com/en-gb/products/potassium-hexacyanoferrate-solution
The Experimental Setup
The experiment uses the following components:
📱 SenseItAll Potentiostat
https://shop.zimmerpeacock.com/en-gb/collections/devices
⚡ Carbon 501 Sensor Cartridge Pack
https://shop.zimmerpeacock.com/en-gb/products/carbon-501-sensor-cartridge-pack
🔬 Screen-Printed Electrodes Collection
https://shop.zimmerpeacock.com/en-gb/collections/bare-electrodes
One of the standout features of the SenseItAll platform is the cartridge-based SPE format. Rather than connecting individual electrodes with clips and cables, the cartridge simply clicks into place, making setup fast and intuitive.
This ease of use makes the system particularly attractive for:
- Teaching laboratories
- Undergraduate practicals
- Research environments
- Engineering teams without traditional wet chemistry facilities
- Commercial sensor development
Running the Experiment
After inserting the screen-printed electrode cartridge into the potentiostat, 50 µL of ferricyanide solution is dispensed directly onto the electrode surface.
The experiment is then configured within SenseItAll Desktop using the following parameters:
| Parameter | Value |
|---|---|
| Start Potential | -500 mV |
| Vertex Potential | +500 mV |
| Step Size | 10 mV |
| Scan Rate | 50 mV/s |
| Number of Scans | 3 |
| Sample Volume | 50 µL |
Once configured, the measurement begins immediately.
The data is recorded over three complete cycles, allowing both the electrochemical response and the repeatability of the electrode to be evaluated.
Understanding the Voltammogram
Because the experiment begins at a negative potential, ferricyanide is first reduced to ferrocyanide at the electrode surface.
As the potential is scanned towards positive values, the reverse reaction occurs, oxidising ferrocyanide back to ferricyanide.
The redox reactions can be represented as:
Reduction
Fe(CN)6³⁻ + e⁻ → Fe(CN)6⁴⁻
Oxidation
Fe(CN)6⁴⁻ → Fe(CN)6³⁻ + e⁻
This produces the characteristic cyclic voltammogram containing both reduction and oxidation peaks.
The resulting trace exhibits the classic "duck-shaped" appearance associated with a reversible, diffusion-controlled electrochemical process.
For students learning electrochemistry, this response provides a clear visual demonstration of:
- Electron transfer reactions
- Oxidation and reduction processes
- Mass transport by diffusion
- Electrochemical reversibility
Diffusion-Controlled Behaviour
One of the most important observations in this experiment is the shape of the voltammogram.
The smooth, well-defined oxidation and reduction peaks indicate that the process is dominated by diffusion. In other words, the rate at which ferricyanide molecules reach the electrode surface controls the measured current.
This behaviour is regularly used in teaching laboratories because it allows students to connect electrochemical theory with real experimental data.
The ferricyanide system therefore serves as an excellent model redox couple for demonstrating the principles of cyclic voltammetry.
Scan-to-Scan Repeatability
Three consecutive scans were recorded during this demonstration.
A key observation is the excellent overlap between successive voltammograms.
Good repeatability indicates:
- ✅ Stable electrode performance
- ✅ Reliable cartridge construction
- ✅ Consistent electrochemical behaviour
- ✅ Robust potentiostat operation
- ✅ High-quality measurement reproducibility
For educators, this is particularly beneficial as it allows students to obtain meaningful results without extensive optimisation or troubleshooting.
Why This Makes an Excellent Teaching Experiment
Electrochemistry can sometimes appear intimidating to newcomers, but ferricyanide cyclic voltammetry removes many of the usual barriers.
The combination of:
- Ready-to-use ferricyanide solution
- Disposable screen-printed electrodes
- Small sample requirements
- Intuitive software
- Rapid experiment times
creates an electrochemical experiment that is both accessible and scientifically rigorous.
Using only 50 µL per experiment offers several advantages:
- Reduced reagent consumption
- Lower operating costs
- Minimal laboratory waste
- Increased student throughput
- Simplified laboratory logistics
A single bottle of ferricyanide solution can support many experiments, making the setup particularly attractive for educational settings.
Automatic Cloud Data Storage
After the measurement is completed, SenseItAll Desktop automatically uploads the experimental data to the cloud.
☁️ Djuli Cloud Platform
https://djuli.zimmerpeacock.no/
This cloud-based workflow means users always know where their data is stored.
Benefits include:
- Automatic saving
- Centralised data management
- Reduced risk of data loss
- Easy access across multiple devices
- Simplified collaboration
For teaching laboratories and research groups alike, this removes many of the traditional data-management challenges associated with electrochemical experiments.
Bringing Traditional Electrochemistry Into a Modern Workflow
The SenseItAll platform combines the analytical capability of a traditional potentiostat with a modern, user-friendly workflow.
The system supports a range of electrochemical techniques including:
- Cyclic Voltammetry (CV)
- Square Wave Voltammetry (SWV)
- Linear Sweep Voltammetry (LSV)
- Chronoamperometry (CA)
- Open Circuit Potentiometry (OCP)
Whether you are:
- 🎓 Teaching electrochemistry
- 🔬 Conducting academic research
- 🚀 Developing commercial sensors
- ⚙️ Training engineers and scientists
the platform provides a straightforward route to generating high-quality electrochemical data.
The ferricyanide cyclic voltammetry experiment presented here is an ideal starting point for learning electrochemistry while also providing a robust system for instrument verification, research, and product development.
Products Used
📱 SenseItAll Potentiostat
https://shop.zimmerpeacock.com/en-gb/collections/devices
🧪 Potassium Hexacyanoferrate (Ferricyanide) Solution
https://shop.zimmerpeacock.com/en-gb/products/potassium-hexacyanoferrate-solution
⚡ Carbon 501 Sensor Cartridge Pack
https://shop.zimmerpeacock.com/en-gb/products/carbon-501-sensor-cartridge-pack
🔬 Screen-Printed Electrodes Collection
https://shop.zimmerpeacock.com/en-gb/collections/bare-electrodes
🧫 Electrochemistry Solutions & Accessories
https://shop.zimmerpeacock.com/en-gb/collections/solutions
Learn More
If you have any questions about cyclic voltammetry, screen-printed electrodes, electrochemical sensors, or the SenseItAll platform, we'd be delighted to help.
📩 Contact Zimmer & Peacock:
https://www.zimmerpeacock.com/contact
