Mechanistic Insights Gained by Monitoring Carbon Nanotube/Prussian Blue Nanocomposite Formation With in Situ Electrochemically Based Techniques

Abstract

Mass loadings and mechanistic insights into the stepwise formation of Prussian blue (PB) in a carbon nanotube nanocomposite electrode,formed by an in situ electrochemical reaction between iron species filling the carbon nanotubes cavities and ferricyanide ions in solution, have been probed by electrochemical quartz crystal microbalance (EQCM), electrochemical surface plasmon resonance (SPR), and scanning electrochemical microscopy (SECM). Changes to the interfacial nanotube “electrode/electrolyte” (aqueous KCl) region during PB oxidation and reduction and the influence of the applied potential also have been assessed by EQCM mass and SPR refractive angle changes that reflect the local redox activity. The data obtained confirm that KCl present as the supporting electrolyte participates in PB formation, and SECM studies reveal that redox activity takes place at both metallic centers in PB. Large changes in the SPR angle with variation in applied potential and electrolyte cation in the carbon nanotube/PB film suggest that the nanocomposite material represents a promising material for the development of nanostructured optical devices.

Charge storage properties of single wall carbon nanotubes/Prussian blue nanocube composites studied by multi-scale coupled electrogravimetric methods

“…Recently Nossol et al studied the electrochemical behavior of CNT/PB nanocomposite in KCl aqueous solution using electrochemical techniques including the EQCM, and scanning electrochemical microscopy (SECM). The authors confirm with these techniques that KCl participates as electrolyte support in PB formation and the redox activity takes place at both metallic centers in PB [13]. Furthermore, the authors suggest that the nanocomposite material provide a potentially useful material for applications in optical devices and as cathode for flexible and transparent potassium ion battery [42].…”

“…However, there are studies that indicate that CNTs have limitations [9,12] as well as advantages [13]. Therefore, an alternative is the use of materials composed of different compositions that combine the beneficial aspects and compensate the limitations of each one of the compositions, as is the case of composite materials [14,15].…”

“…Prussian blue (PB) is a material widely studied due to its interesting electrochromic, electronic, redox and photo magnetic properties. PB presents many potential applications in electrocatalysis, sensors, rechargeable batteries, electrochromic devices and photomagnetism [13,[21][22][23].…”

Photoanode for Aqueous Dye‐Sensitized Solar Cells based on a Novel Multicomponent Thin Film

“…The liquid/liquid (L/L) interfacial method was originally adapted to prepare a thin film of the CNT/TiO 2 composite by using a homemade Fe‐filled CNTs sample and commercial TiO 2 nanoparticles. Then, PB was electrodeposited over the CNTs from the CNT/TiO 2 film through a heterogeneous solid–liquid reaction between the iron species present inside the cavities of the CNTs and the [Fe(CN) 6 ] 3+ ions in aqueous solution ,,…”

Síntese e caracterização de filmes nanocompósitos de óxido de grafeno reduzido, nanotubos de carbono e azul da Prússia para a determinação de peróxido de hidrogênio e cloro ativo

“…O uso do método interfacial 101 provém filmes bastante homogêneos e transparentes de nanocompósitos 10,66,98,102,103 que exibem grande potencial para preparação de sensores. O método interfacial consiste na utilização de solventes de diferentes polaridades, formando assim duas fases, com consequente formação de um filme na interface formada pelo encontro das fases.…”