Facilely synthesized Fe2O3–graphene nanocomposite as novel electrode materials for supercapacitors with high performance

Abstract

a b s t r a c tFe 2 O 3 -graphene nanocomposite with high capacitive properties had been prepared friendly and facilely by hydrothermal method in one-step. The morphology and structure of the obtained material were examined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscope (TEM) techniques. It was revealed by TEM images that Fe 2 O 3 nanoparticles grow well on the surface of graphene and the formation of Fe 2 O 3 nanoparticles hinders the aggregation of graphene (reduced graphene oxide, namely, RGO). Electrochemical properties of the synthesized materials were characterized by serials of electrochemical measurements in 1 M Na 2 SO 4 electrolyte. Fe 2 O 3 -graphene nanocomposite electrode show higher specific capacitance than graphene, indicating an accelerative effect of Fe 2 O 3 and graphene on improving the electrochemical performance of the electrode. The specific capacitance of Fe 2 O 3 -graphene nanocomposite is 226 F/g at a current density of 1 A/g. These attractive results indicate it is possible to seek and develop the promising, environmentally benign and commercial electrodes material based on Fe 2 O 3 and graphene.Crown

Microwave assisted fabrication of a nanostructured reduced graphene oxide (rGO)/Fe2O3 composite as a promising next generation energy storage material

“…1b). 13,32 The average crystallite size is calculated to be 15.1 nm using Debye-Scherrer's equation. Additionally, no peak emerges at around 2q ¼ 25 in the XRD spectrum of composite, which suggests that the rGO platelets have been homogenously dispersed on the surface of the Fe 2 O 3 nanoparticles.…”

“…The comparison with previous reports clearly depicts that the microwave assisted synthesis of rGO-Fe 2 O 3 composite presented in this paper provides highest symmetrical chargedischarge curves. 13,[16][17][18][19][20][21]32 The specic capacitance for rGO/GCE and rGO-Fe 2 O 3 /GCE at a current density of 2 A g À1 is calculated to be 105 F g À1 and 577.5 F g À1 respectively, which is much higher than some of the earlier reports based on rGO/Fe 2 O 3 composition. [17][18][19][20][21]32 The rate performance of rGO/GCE and rGOFe 2 O 3 /GCE is also analyzed by plotting specic capacitance against current density.…”

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

“…The intrinsic high electrical conductivity (2420 S m -1 ) and large specific surface area (2630 m ) of graphene could endow supercapacitors with high specific power [14,18]. On the other hand, metal oxide (or metal hydroxide) nanoparticles could act as spacers in the interlayers of graphene sheets to prevent them from aggregation, increasing the interplanar spacing and contact area with the electrolyte [20].…”

Hybrids of NiCo 2 O 4 nanorods and nanobundles with graphene as promising electrode materials for supercapacitors

“…These encouraging characteristics provide such new materials a wide range of potential applications [11,16]. Recently, numerous works have been done on hybrid metal oxides-reduced graphite oxide (RGO), such as Mn 3 O 4 , Co 3 O 4 , NiO, Fe 2 O 3 , and NiAl-LDH [17][18][19][20][21][22]. However, spinel transition metal oxides (AB 2 O 4 ), with two metal elements provide the feasibility to tune the energy density and working voltage by varying the metal content, have less been developed [23][24][25] …”