PVP assisted morphology-controlled synthesis of hierarchical mesoporous ZnCo 2 O 4 nanoparticles for high-performance pseudocapacitor

摘要: Abstract ZnCo2O4 nanoparticles (NPs) with four different and unique morphologies were synthesized using mass ratio of polyvinyl pyrrolidone (PVP) respect to metal oxides: 0.55 wt% PVP (P1), 1.09 wt% (P2), 1.64 wt% (P3) 2.18 wt% (P4), through a facile hydrothermal process followed by heat treatment used as electrodes for high performance pseudocapacitor. In this study, served surface stabilizer growth modifier during NPs synthesis. Each oxides resulted morphologies: rods, ring, oval “rice grain”, hexagonal-like shape composed numerous NPs. The resulting products analyzed thermo gravimetric analysis (TGA), X-ray diffraction (XRD), field emission scanning electron micrographs (FE-SEM) coupled energy dispersive spectrometer (EDX), high-resolution transmission microscopy (HR-TEM) Brunauer-Emmett-Teller (BET). ring-like morphology (P2) showed the highest specific capacitance 2834.18 F g−1 at scan rate 2 mV s−1. Additionally, P2 material also 1152.19 F g−1 current density 5 A g−1 displayed excellent cycling ability even after 3000 cycles 50 mV s−1 rate.