Synthesis and characterization of reduced graphene oxide/magnetite/polyaniline composites as electrode materials for supercapacitors Sajedeh Rezapour Charandabinezhad 1 , Hamed Asgharzadeh 1, * , and Nasser Arsalani 2 1 Nanostructured and Novel Materials Laboratory (NNML), Department of Materials Engineering, University of Tabriz, 51666-16471 Tabriz, Iran 2 Research Laboratory of Polymer, Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran Received: 1 June 2020 Accepted: 23 November 2020 Published online: 3 January 2021 Ó Springer Science+Business Media, LLC, part of Springer Nature 2021 ABSTRACT The ternary composites consisted of reduced graphene oxide, magnetite, and polyaniline (rGO/Fe 3 O 4 /PANI) were synthesized by a simple procedure. Fe 3 O 4 nanoparticles were produced by chemical precipitation route and then hybri- dized with rGO through chemical reduction of GO. PANI chains were grown by in situ polymerization on the rGO/Fe 3 O 4 to attain the ternary composite pow- ders. The synthesized composites were characterized by XRD, UV–Vis, FTIR, Raman, FESEM, and EDS techniques. The results confirm the formation of PANI nanofibers beside rGO nanoplatelets decorated by crystallized Fe 3 O 4 nanopar- ticles. The electrochemical behavior of the synthesized composites as electrode materials for supercapacitors was evaluated by CV, EIS, and GCD tests. The unique nanostructure of the synthesized composites and the synergic interaction among rGO nanoplatelets, Fe 3 O 4 nanoparticles, and PANI chains result in the superior performance of the ternary composite in the charge storage. The rGO/ Fe 3 O 4 /PANI electrode unveils a high specific capacitance of 610.4 F g -1 and excellent cyclic stability with a retention ratio of 87% after 1000 cycles at 1 A g -1 . Although increasing the PANI content in the rGO/Fe 3 O 4 /PANI composite degrades the electrochemical performance of the electrode, but the specific capacitance of the ternary composite electrode is still higher than the sole PANI and Fe 3 O 4 or the binary rGO/Fe 3 O 4 composite. Address correspondence to E-mail: asgharzadeh@tabrizu.ac.ir https://doi.org/10.1007/s10854-020-04955-7 J Mater Sci: Mater Electron (2021) 32:1864–1876