Superstable advanced hydrogen peroxide transducer based on transition metal hexacyanoferrates

Area of Science:

• Electrochemistry
• Materials Science
• Biosensors

Background:

• Hydrogen peroxide (H2O2) transducers are crucial in various analytical applications.
• Existing H2O2 transducers often suffer from limited stability and tolerance to interfering substances.
• Prussian Blue (PB) is a common material for H2O2 detection but has stability limitations.

Purpose of the Study:

• To develop a superstable hydrogen peroxide transducer.
• To enhance the chemical and mechanical stability of H2O2 transducers.
• To improve the tolerance of H2O2 transducers to alkaline solutions and iron ligands.

Main Methods:

• Sequential deposition of iron- and nickel-hexacyanoferrate (NiHCF) layers.
• Electrochemical deposition of five bilayers of Prussian Blue-NiHCF (PB-NiHCF).
• Testing transducer stability under continuous wall-jet flow of H2O2.
• Fabrication on screen-printed electrodes in an open circuit regime.

Main Results:

• The PB-NiHCF transducer demonstrated complete stability for over 2 hours under continuous flow.
• Common Prussian Blue lost half its response within 20-25 minutes under similar conditions.
• PB-NiHCF bilayers showed dramatically improved tolerance to alkaline solutions and iron ligands.
• Despite a 2-2.5 times decrease in sensitivity, the dynamic range was maintained due to reduced noise.

Conclusions:

• Sequential deposition of PB-NiHCF layers creates a highly stable and robust H2O2 transducer.
• The developed transducer offers superior performance compared to conventional Prussian Blue-based sensors.
• This advancement holds promise for more reliable H2O2 detection in demanding environments.