ISENTIAL: Inline sensing for safer, more efficient electrolysers

Seeing inside the electrolyser

Electrolysers operate under demanding electrochemical and thermal conditions. Local temperature gradients and unintended hydrogen crossover can reduce efficiency, accelerate degradation and pose safety risks. Until now, these effects have largely remained ‘out of reach’ for direct measurement.

ISENTIAL addresses this challenge by initiating the development of advanced fiber-optic, multiparameter sensor systems designed for direct integration within proton exchange membrane (PEM) and alkaline (ALK) electrolyser cells and stacks. By utilizing Fiber Bragg Grating (FBG) technology combined with sophisticated optical interrogation techniques, we aim to obtain insights into state-of-operation obtaining critical operation data, temperature distribution and mechanical strain. In parallel, the project explores optical hydrogen sensing using metal hydride coatings, paving the way for future in-stack H₂ detection under harsh conditions.

From insight to impact

By making internal process measurable, ISENTIAL supports better operation, design and control of electrolysers. The project aims to gain insights leading to impact:

• Detailed temperature mapping to understand degradation early indicator
• Early detection of H2 crossover to improve safety
• Enabling higher efficiency and longer operational lifetime

ISENTIAL innovates and advances fiber optic sensing technology in close collaboration with electrolyser OEMs and end users, steering the pathway to impact.