Layer-by-layer assembly of iron oxide-decorated few-layer graphene/PANI:PSS composite films for high performance supercapacitors operating in neutral aqueous electrolytes

FENOY, GONZALO E.; VAN DER SCHUEREN, BENOIT; SCOTTO, JULIANA; BOULMEDAIS, FOUZIA; CEOLÍN, MARCELO R.; BÉGIN-COLIN, SYLVIE; BÉGIN, DOMINIQUE; MARMISOLLÉ, WALDEMAR A.; AZZARONI, OMAR

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2018 vol. 238 p. 1178 - 1187

0013-4686

The layer-by-layer assembly of polyaniline-PSS (PANI:PSS) complexes and iron oxide nanoparticles decorated few-layer graphene (Fe-FLG) from aqueous dispersions, yielding an electrode material with excellent electrochemical capacitive performance in simple neutral aqueous electrolyte is presented. Thesimple dip-coating procedure allows the effective incorporation of both materials and the control of the film nanoarchitectonics. The resulting composite coating was characterized by XPS and Raman spectroscopies.A linear dependence of the capacitance on the film mass indicates that both building blocks are efficiently (and electrochemically) connected within the films. The electrochemical performance of the film-coated electrodes was tested in both acidic (0.1 M HCl) and neutral (0.1 M KCl) aqueous electrolytes.Electrodes constituted of 15 self-assembled bilayers showed the best performance with a high capacitance of 768.6 F g1 and 659.2 F g1 in 0.1 M HCl and 0.1 M KCl, respectively, at the current density of 1 A g1 . Moreover, a high stability to continuous cycling was observed, even in aqueous neutral solution(86% capacitance retention after 1600 cycles at 3 A g1 ). This ternary material then constitutes a promising candidate for the construction of environmentally friendly supercapacitors.