Magnetic and dispersible FeCoNi-graphene film produced without heat treatment for electromagnetic wave absorption

We report a facile, two-step synthesis process for a porous polyaniline/reduced graphene oxide composite (PANI/rGO-HT) that involves the oxidative polymerization of aniline, followed by the hydrothermal treatment of polyaniline (PANI) and graphene oxide. The reduction of graphene oxide under hydrothermal conditions in the presence of PANI nanoparticles yields a three-dimensional porous composite with a specific surface area of 228 m2 g−1, which delivers high specific capacitances from 420 to 239 F g−1 at current densities of 0.2–20 A g−1. PANI/rGO-HT exhibits remarkable electrochemical stability due to the rGO, achieving a capacitance retention of 80% after 6000 cycles at a high current density of 2 A g−1, which unveils its promising potential for supercapacitor applications.

Hydrothermal-assisted synthesis of a porous polyaniline/reduced graphene oxide composite as a high-performance electrode material for supercapacitors

Nickel hydroxide nanosheets supported on reduced graphene oxide for high-performance supercapacitors

Rational design and facile synthesis of binary metal sulfides VS2-SnS2 hybrid with functionalized multiwalled carbon nanotube for the selective detection of neurotransmitter dopamine.

We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml−1) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The highly concentrated LPEOG ink can be used in solution processing such as simple drawing or spin casting. Reduced LPEOG showed a higher conductivity (120 000 S m−1) than that of reduced graphene oxide (68 800 S m−1) despite the small lateral size. A transparent conducting film prepared from the LPEOG ink showed a lower surface resistance (∼2.97 kΩ sq−1) at a higher transmittance (>83.0 %T) compared to those of the graphene oxide based film. These results indicate that preservation of π-conjugation of the basal plane of graphene is critical for electrical performance of graphene. Our method facilitates solution processing of graphene for a wide range of applications.

Highly dispersible edge-selectively oxidized graphene with improved electrical performance

In this research, we have analyzed the electrochemical characteristics of the different rGO/Co3O4 composites prepared by controlling the rGO surface characteristics and its relationship between the growth of Co3O4 nanoparticles and the performance of the pseudocapacitor. Reduced graphene oxide/cobalt oxide (rGO/Co3O4) nanocomposites of different morphologies were prepared through the simple hydrothermal method. First, different kinds of graphite precursors, crumpled and planar with different properties, were used to determine the most suitable substrate to grow Co3O4 nanoparticles. As a result, rGO/Co3O4 composite synthesized from planar graphite shows a higher specific capacitance of 207.2, 170.1, and 141.5 Fg?1 at 1, 2, and 5 Ag?1 than the one prepared from crumpled graphite. In the second part, planar graphite, confirmed to be the most suitable substrate from the previous part, was oxidized under various oxidation conditions to increase the oxygen functional groups attached on the GO surfaces and observed to see how it affects the growth of Co3O4 nanoparticles and its influence on the electrochemical performance of the rGO/Co3O4 pseudocapacitor. As a result, the one with the largest amount of functional groups had the Co3O4 nanoparticles well dispersed and grown on the rGO substrate in small nanoparticle sizes, as small as 5.9 nm, leading to an improved electrochemical performance. Thus, the specific capacitance with the least amount of oxygen functional groups are 207.2, 170.1, and 141.5 Fg?1 and for the largest amount of functional groups are 411.5, 371.4, and 292.7 Fg?1, at 1, 2, and 5 Ag?1 respectively. This approach could become a guideline for the ideal fabrication of rGO/metal oxide composite for further research involving rGO based pseudocapacitors.

http://iopscience.iop.org/article/10.1088/2053-1583/2/1/014007/pdf

The effect of surface characteristics of reduced graphene oxide on the performance of a pseudocapacitor

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The effect of surface characteristics of reduced graphene oxide on the performance of a pseudocapacitor