Magnetite Nanoparticles In-Situ Grown and Clustered on Reduced Graphene Oxide for Supercapacitor Electrodes

Abstract

Fe3O4 nanoparticles with average sizes of 3–8 nm were in-situ grown and self-assembled as homogeneous clusters on reduced graphene oxide (RGO) via coprecipitation with some additives, where RGO sheets were expanded from restacking and an increased surface area was obtained. The crystallization, purity and growth evolution of as-prepared Fe3O4/RGO nanocomposites were examined and discussed. Supercapacitor performance was investigated in a series of electrochemical tests and compared with pure Fe3O4. In 1 M KOH electrolyte, a high specific capacitance of 317.4 F g−1 at current density of 0.5 A g−1 was achieved, with the cycling stability remaining at 86.9% after 5500 cycles. The improved electrochemical properties of Fe3O4/RGO nanocomposites can be attributed to high electron transport, increased interfaces and positive synergistic effects between Fe3O4 and RGO.

Multifunctional and self-healable conductive IPN hydrogels functionalized with reduced magnetite graphene oxide for an advanced flexible all in one solid-state supercapacitor

“…The performance of the hydrogels was more stable and better than that reported previously in the literature. The capacitance retention (%) of Fe 2 O 3 and Fe 2 O 3 /RGO was 69.2% and 86.9% after 1000 cycles, 7 respectively, and for Fe 2 O 3 /CNT-rMGO was it was reported to be 82.5% for 1000 cycles. 35 The stability of the hydrogel electrode showed the synergistic behavior for rMGO-GG, and its stable conductivity in the paths within the hydrogel network.…”

“…1 Hydrogels are used in many electrical devices such as smartphones, 2 watches, 3 sensors, 4–6 and in flexible and healable electronic devices. 7 Most of the existing traditional electronic energy storage devices have problems with mechanical wear and damage, and thus, wearing the electronic devices during their routine operation and application is not possible. 8–10 In addition, most of these materials are environmentally threatening to the flora and fauna of the planet.…”

Special Issue: Advanced Nanocomposite Materials Based on Graphene Oxide/Reduced Graphene Oxide: Potential Applications and Perspectives

“…GO/r-GO can be used as nanometric fillers embedded in a polymeric matrix to enhance the structural, morphological, and functional properties of the composite material [3]. In addition, these materials are suitable for electronic and energy storage applications in the form of polymergraphene composites [8]. Furthermore, nanocomposites based on GO/r-GO and inorganic nanoparticles such as Au, Ag, and Pt have attracted much attention due to their applications as catalysts, photocatalysts, electrodes, sensors, substrates for surface-enhanced Raman spectroscopy, and in biomedicine [7].…”

“…Jiang and co-workers studied the in situ growth of Fe 3 O 4 nanoparticles as homogeneous clusters on reduced graphene oxide [8]. In fact, the results showed that Fe 3 O 4 nanoparticles, anchored on r-GO surfaces, formed nanoclusters without aggregation, and they expanded the interlayer spacing between r-GO sheets.…”

“…The improved electrochemical properties of the Fe 3 O 4 /r-GO nanocomposite compared with pure Fe 3 O 4 can be attributed to high electron transport, increased interfaces, and positive synergistic effects between Fe 3 O 4 and r-GO. These nanocomposites represent an effective strategy to develop new advanced supercapacitor electrodes for energy storage devices [8].…”