Design e aplicação de filmes finos envolvendo crumpled graphene e azul da Prússia

Abstract

This study involves synthesizing thin films through an interfacial method, which relies on composites of Prussian blue nanoparticles and nanostructures derived from graphene, known as crumpled graphene. The resulting compounds underwent evaluation for potential applications in aqueous battery-type energy storage systems. Considering the importance of the relationship between structure/property and application, the processing of carbon nanostructures was previously conducted to assess their morphological characteristics and electrochemical performance as an active material and substrate for the growth of Prussian blue nanocubes. To this end, the spray-pyrolysis method was employed. Observations revealed morphological changes in crumpled graphene when infused with β-FeOOH (β-iron (III) oxyhydroxide) species compared to pure crumpled graphene. Moreover, varying the proportion of iron precursor mass demonstrated a significant influence on material morphology, particularly when comparing ratios of 1:1 and 1:3. In forming the composite between crumpled graphene and Prussian blue utilized the electrodeposition method via cyclic voltammetry, which was proven the formation of Prussian blue nanocubes on the surface of the crumpled graphene with sizes between 48 and 153 nm depending on the number cycles. Specific capacity values varied based on compound structure, with the highest recorded value of 44.4 mAh g-1 for AP_10 composite achieved in an aqueous electrolyte of 0.1 mol L-1 of KCl vs. Ag/AgCl (KCl 3.0 mol L-1).