Effect of Deposition Conditions on Stability of PB Films at PEMFC's Operating Temperatures and pH

Abstract

Optrodes based on Prussian blue (PB) are promising for hydrogen peroxide detection within PEMFCs to study the Membrane-Electrode-Assembly degradation. The PB film is however required to sustain the harsh environment of PEMFCs. In this work, PB films were deposited through different conditions and soaked in Phosphate-Buffer-Solutions with pH 2 at elevated temperatures for a day. These PB films were characterized using FTIR to analyze their stability following PBS processing at operating temperature and pH corresponding to an operating PEMFC. The PB film prepared using the single-source-precursor at the temperature of 60 • C is found to be the most stable.

An Innovative Sensor Construction Strategy via LbL Assembly for the Detection of H2O2 Based on the Sequential In Situ Growth of Prussian Blue Nanoparticles in CMC-PANI Composite Film

“…5c -5e) towards amperometric H 2 O 2 detection compared to that obtained from CMC:PANI:PB, which relies on the PBNPs production by in situ technique (sis-PB).Potentiometric deposition time of PBNPs is known to be effective on both their quantity and electrochemical stability on a substrate. 43,97 The spontaneous PB synthesis strategy is limited in the growth and immobilization of a sufficient amount of PBNPs since its synthesis mechanism only relies on ionic diffusion. In contrast, the sequential in situ PB synthesis strategy seems to be a highly repeatable technique along with a stable electroactive interface generation since it allows the simultaneous production and immobilization of PBNPs at the inner side of the conductive layer thanks to the utilization of both ionicdiffusion and electrochemical driving force.…”