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

Potassium (de‐)insertion from Prussian blue (PB) is investigated at the single and multi‐particle scale. The electrochemical behaviour is found to differ between the two measurement types. At the single particle level, oxidation of the PB nanoparticles with concomitant K+ deinsertion occurs more rea...

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Bibliographic Details
Published in:Chemistry : a European journal 2017-10, Vol.23 (57), p.14338-14344
Main Authors: Zampardi, Giorgia, Sokolov, Stanislav V., Batchelor‐McAuley, Christopher, Compton, Richard G.
Format: Article
Language:English
Subjects:
(de-)insertion kinetics
Additives
Chemistry
Electrochemical analysis
Electrochemistry
Insertion
Nanoparticles
Oxidation
Particulate composites
Potassium
potassium-ion batteries
Prussian blue
zero charge
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Summary:Potassium (de‐)insertion from Prussian blue (PB) is investigated at the single and multi‐particle scale. The electrochemical behaviour is found to differ between the two measurement types. At the single particle level, oxidation of the PB nanoparticles with concomitant K+ deinsertion occurs more readily than the associated reduction, relating to K+ insertion. In contrast, the cyclic voltammetry of PB in a composite electrode containing conductive additives and polymeric binder suggests the opposite behaviour. Implications for assessing battery materials are discussed. PB&J: Potassium insertion and deinsertion processes were investigated in Prussian blue at the nanoscale through the nanoimpact method. The electrochemical behaviour of the material at the single particle was confronted to the one at the composite level, which is influenced by the presence of conductive additives and polymeric binder.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201703175