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Biofunctionalized Prussian Blue Nanoparticles for Multimodal Molecular Imaging Applications

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Potassium (De-)insertion Processes in Prussian Blue Particles: Ensemble versus Single Nanoparticle Behaviour.

Giorgia Zampardi¹, Stanislav V Sokolov¹, Christopher Batchelor-McAuley¹

¹Department of Chemistry, Physical and Theoretical Chemistry Laboratory (PTCL), University of Oxford, South Parks Road, OX1 3QZ, Oxford, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|August 24, 2017

Summary

Potassium ion (de-)insertion in Prussian blue differs between single particles and composite electrodes. Single-particle studies show easier deinsertion, while electrode studies indicate easier insertion, impacting battery material assessment.

Keywords:

(de-)insertion kinetics Prussian blue electrochemistry potassium-ion batteries zero charge

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Area of Science:

Electrochemistry
Materials Science
Nanotechnology

Background:

Prussian blue (PB) is a promising cathode material for potassium-ion batteries.
Understanding the electrochemical behavior of PB at different scales is crucial for optimizing battery performance.
Discrepancies in electrochemical responses between single-particle and bulk electrode measurements can hinder material development.

Purpose of the Study:

To investigate the potassium (de-)insertion mechanisms in Prussian blue at both single-particle and multi-particle (composite electrode) levels.
To compare the electrochemical behavior of Prussian blue under different measurement conditions.
To discuss the implications of these findings for the accurate assessment of battery materials.

Main Methods:

Single-particle electrochemical measurements of Prussian blue nanoparticles.
Cyclic voltammetry of Prussian blue in composite electrodes containing conductive additives and binders.
Comparative analysis of electrochemical data from single-particle and composite electrode studies.

Main Results:

At the single-particle level, oxidation (potassium ion deinsertion) was observed to be more facile than reduction (potassium ion insertion).
Conversely, cyclic voltammetry of Prussian blue in a composite electrode indicated that reduction (potassium ion insertion) was more readily achieved than oxidation (potassium ion deinsertion).
Significant differences in electrochemical behavior were identified between single-particle and composite electrode measurements.

Conclusions:

The scale of measurement significantly influences the observed electrochemical behavior of Prussian blue during potassium (de-)insertion.
Findings highlight the importance of considering measurement scale when evaluating the performance of battery materials like Prussian blue.
This research provides critical insights for developing reliable methods for assessing next-generation battery materials.