SIVONIC is supporting the 9th Industry Workshop “Advanced Alkaline-based Electrolysis”, taking place on 8–9 October 2026 at Fraunhofer IFAM in Dresden, as one of the event sponsors.
The workshop focuses on current developments in alkaline water electrolysis (AEL) and anion exchange membrane electrolysis (AEMEL) – from components and stack design to testing, operation and industrial-scale applications.
A key question in the development and operation of electrolyzers is: What is changing inside the stack – and how can the underlying causes be distinguished more effectively?
This is where the combination of complementary diagnostic methods can provide additional insight.
DRT – Distribution of Relaxation Times evaluates impedance spectra according to their characteristic time constants. This helps separate overlapping electrochemical process contributions and enables changes in the system response to be analyzed in greater detail.
HRA – Harmonic Ratio Analysis adds another perspective by evaluating higher harmonic signal components. It provides information about the nonlinear behavior of the electrochemical system that is not contained in conventional impedance analysis.
The particular value lies in the combined evaluation of DRT and HRA. Different operating or degradation states can result in similar changes in impedance. Additional HRA characteristics can help distinguish such states more clearly. DRT and HRA therefore provide complementary rather than competing diagnostic information.
The underlying analysis approach is not limited to PEM systems and can also be applied to alkaline electrolysis systems. Measurement conditions, reference ranges and interpretation of the diagnostic features must, however, be adapted to the respective technology and operating point.
With SIVONIC multichannel measurement technology, an additional spatial dimension can be included in the analysis. Simultaneous evaluation of individual cells or cell groups helps identify local deviations within a stack rather than relying solely on overall stack behavior.
Our objective is clear: detect changes, narrow down their causes more reliably, and derive targeted decisions for development and operation.
We look forward to exchanging ideas with developers, electrolyzer manufacturers, component suppliers and research partners at Fraunhofer IFAM in Dresden.
![[Translate to Englisch:] 9. Industry Workshop „Advanced Alkaline-based Electrolysis“ with SIVONIC](/fileadmin/_processed_/4/7/csm_Workshop_Alkaline_Elctrolysis_SIVONIC_9c73048bdf.png)