Water electrolysis in Proton Exchange Membrane Water Electrolysis (PEMWE) cells is important for sustainable energy conversion. The efficiency and longevity of these cells depend on operating conditions such as the temperature of the membrane. We employ a fiber-based sensor using lanthanide-doped nanoparticles as nanothermometers to measure the temperature at the cell’s membrane for different operational conditions. In the future, this sensor can be used to optimize the cell’s operational parameters and is also applicable in strong electromagnetic fields, for example in battery technology or magnetic resonance tomography.
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