About Gaskatel

We are member at:


International society of Electrochemistry

Gesellschaft deutscher Chemiker

Gesellschaft Deutscher Chemiker


Deutsche Bunsen-Gesellschaft für physikalische Chemie e.V.

Understanding electrochemistry!

This is not so easy with a subject that includes physics, chemistry and process engineering.
We at Gaskatel embody this interdisciplinarity.
Our desire to understand electrochemistry is reflected in our products of measurement technology (reference electrodes, pH electrodes, measuring cells).
Our hydrogen reference electrode is the only commercial electrode in the world that complies with IUPAC regulations. Of course, it corresponds to the ideas of its inventor, Nobel Prize winner Walter Nernst.
Our hydrogen pH electrode actually measures the proton concentration and not the voltage drop across a glass membrane.
Our corrosion test cell maps the actual current density or corrosion rate.
But also with our services we are not only interested in making analyses for our customers. From the analytical measurements we try to work out a complete picture for the customer’s problem.

But why is electrochemistry so complex?

Now the chemical redox reactions in electrochemistry are divided into two electrodes connected to an electrolyte and an electrical conductor.
Although the reactions are spatially separated, they are not independent of each other.
As is usual in physics, this does not allow the system to be simplified at will.
One way of doing this is to introduce a third measuring electrode – the so-called reference electrode. This was assigned to the hydrogen electrode by IUPAC in 1953. One speaks of a measurement with a reference value.
This is very common, e.g. for temperature. Here the zero point 0°C is set to the state of the frozen water. Or the water level in a length above normal zero.
With the help of a reference electrode and a potentiostat, which adjusts the desired reaction at the anode or cathode, the electrochemical reactions can be examined quite precisely.
But even here, the system is not completely independent of each other. In order to decouple this, special measuring cells are required. Gaskatel has developed such a test cell.
Nevertheless, electrochemistry continues to prove difficult. This is because the electrolyte varies over an enormous range of about 16 orders of magnitude in the charge carrier concentration as well as in the different charge carrier mobilities.

Our Projects

Games – CO2-WIN

Gas Diffusion Electrodes for Coupled Microbial Electrochemical Syntheses


Games – CO2-WIN


Oxalic acid from CO2 using Electrochemistry At demonstratioN scale


This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 767798.


Cordis factsheet


Cost-effective CO2 conversion into chemicals via combination of Capture, ELectrochemical and BIochemical CONversion technologies



Our history

Gaskatel GmbH was founded in 1997 by members of Prof. Winsel’s working group at the University of Kassel. Since that time our team of physicists, chemists and engineers and lab staff is engaged in the development, manufacturing and sale of:


HydroFlex – Hydrogen Reference Electrode
pHydrunio – pH-Hydrogen Electrode
FlexCell – Test cell for electrochemical half cell measurements
BiPlex – Gas Diffusion Electrodes for different applications
SOC – State of Charge Censor for measurement of sulfuric acid density in lead accumulators


Since then, Gaskatel has been a competent contact for:


  • Fuel Cells & Electrolysers
  • Development projects
  • Electrochemical measurements such as corrosion


Service makes the Difference!


Performing electrochemical measurements is challenging. We do our best to make it easier for you.


We developed some test equipment based on the experience that we ourselves gained in the lab. And as it was developed by us we know what we talk about if you ask for support on the phone or by e-mail.


We also run your tests and interpret the results for you if you prefer to make a deeper use of our expertise and our many years of experience.

Electrochemical test equipment

1997: Reversible Hydrogen Electrode (RHE) for Strong Alkaline Electrolytes
Replaces Hg/HgO references

2000: Reversible Hydrogen Electrode (RHE) for Strong Acidic Electrolytes

Replaces Hg/HgSO4 references

2010: Reversible Hydrogen Electrode (RHE) in Weak Electrolytes

2012: Test Cell for Gas Diffusion Electrodes

2015: Test Cell for Metallic plates, Corrosion Measurements

2018: Test Cell for Membranes, Hydrogen Embrittlement

2019: pH Electrodes based on Hydrogen Reference Rlectrodes

Gas diffusion electrode

2000-2008: Oxygen Reduction Reaction (ORR). Silver Catalyst, Chlorine Alkaline Electrolysis

2010-2016: Oxygen Reduction Reaction (ORR). Carbon Catalyst, H2O2 Production

2014-2020: Hydrogen Evolution Reaction (HER). Ni Catalyst, Water Splitting, Zinc Air Battery, Bifunctional Oxygen Electrode

2016: Oxygen Reduction Reaction (ORR). MnO2 Catalyst, Metal Air Batteries

Fuel cells

1997: Alkaline Fuel Cells

1998: PEM Fuel Cells

2000-2004: PBI Fuel Cells

2019: Alkaline Fuel Cells for education


1997-2006: Alkaline Electrolysers

2009-2014: Fluorine Electrolysers

2010-2014: Alkaline Membrane Electrolysers


1997-1998: Oxygen Sensor

1997-1999: Hydrogen Diffusion in Pplastic

1999-2002: Electrochemical Pump

2002-2004: Hydrogen Sensor

2014-2016: Hydrogen Generator Battery

1997-2019: Sensor for Water Activity / Acid Density Measurement

2014-2020: CO2 Reduction

Dr. Hans-Joachim Kohnke
Managing Director

Phone: +49 561 59190
E-mail: kohnke@gaskatel.de

Joachim Helmke
Managing Director

Phone: +49 561 59190
E-Mail: Helmke@gaskatel.de

How to reach us

How to get to Kassel

Through Frankfurt-Airport: You can either take a direct train from the airport station or travel via Frankfurt Central to “Kassel-Wilhelmshöhe”. It will take about two hours to Kassel.

You will find us on the 2nd floor.

GASKATEL Gesellschaft für Gassysteme durch Katalyse und Elektrochemie mbH
Lilienthalstrasse 146
Gebäude 11
34123 Kassel, Deutschland


Contact us in many ways – here you will find all.

Gaskatel Gesellschaft für Gassysteme durch Katalyse und Elektrochemie GmbH

Lilienthalstrasse 146
Building 11
34123 Kassel

Telefon: +49 561 59190
Fax: +49 561 59191

E-Mail: info@gaskatel.de