Developing a hydrogen peroxide (H_2O_2) sensor able to measure small concentrations of H_2O_2 in-situ is crucial to understanding the degradation mechanisms that take place in the Membrane-Electrode-Assembly of a PEM-fuel cell. Fiber optic sensing probes based on Prussian blue (PB) are promising for this application. The PB film is however required to sustain the harsh environment of PEM-fuel cells. In this work, Prussian blue films have been deposited at different synthesis temperatures, and using different precursors. The samples were immersed and left in a Phosphate-Buffer-Solution (PBS) at pH 2 at 80 °C for 21 hours and thereafter at 90 °C for 3 hours. These PB films were characterized using FTIR to analyze their stability following PBS processing at operating temperature and pH corresponding to an operating PEM-fuel cell. The PB film prepared using the single-source-precursor (SSP) at the temperature of 60 °C is found to be the most stable.
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