Synthesis of graphene oxide-polyethyleneimine/zeolitic imidazolate framework-67/ poly(p-phenylenediamine) nanocomposite and investigation its electrochemical performance as an electrode effective in supercapacitors

چکیده مقاله

In this study, graphene oxide-polyethyleneimine/zeolitic imidazolate framework-67/poly(p-phenylenediamine), GO-PEI/ZIF-67/PPDA, nanocomposite was synthesized as an efficient electrode by an environmentally friendly technique. This GO-PEI/ZIF-67/PPDA nanocomposite was characterized by thermal gravimetric analysis (TGA), Derivative Thermogravimetry (DTG), field emission gun scanning electron microscopy (FESEM), X-ray diffraction (XRD), energy diffraction X-ray (EDX), Brunauer - Emmett - Teller analysis (BET), and fourier transform infrared (FT-IR) spectroscopy. galvanostatic charge/discharge (GCD), Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques were used to investigate the supercapacitance behavior of the GO-PEI/ZIF-67/PPDA electrode in two electrolytes H₂SO₄, and Na₂SO₄. In particular, the GO-PEI/ZIF-67/PPDA electrode material in 1 M H₂SO₄ exhibited better electrochemical behavior for specific capacitance (CS), cyclic stability, and specific energy than the 1 M Na₂SO₄ electrolyte. CS was achieved of 532 F g⁻¹ at a current density of 1 A g⁻¹ using the 1 M H₂SO₄. Moreover, the H₂SO₄ electrolyte exhibited cyclic stability, where 93.7 % of CS was preserved after 5000 times GCD measurement at a high current density of 5 A g⁻¹. Finally, a symmetric supercapacitor device based on GO-PEI/ZIF-67/PPDA was fabricated with a specific energy of 19 Wh.kg⁻¹ at a specific power of 125 W kg⁻¹. © 2025