Nanostructured Fe2O3–graphene composite as a novel electrode material for supercapacitors

Abstract

Nanostructured Fe 2 O 3 -graphene composite was successfully fabricated through a facile solution-based route under mild hydrothermal conditions. Well-crystalline Fe 2 O 3 nanoparticles with 30-60 nm in size are highly encapsulated in graphene nanosheet matrix, as demonstrated by various characterization techniques. As electrode materials for supercapacitors, the as-obtained Fe 2 O 3 -graphene nanocomposite exhibits large specific capacitance (151.8 F g −1 at 1 A g −1 ), good rate capability (120 F g −1 at 6 A g −1 ), and excellent cyclability. The significantly enhanced electrochemical performance compared with pure graphene and Fe 2 O 3 nanoparticles may be attributed to the positive synergetic effect between Fe 2 O 3 and graphene. In virtue of their superior electrochemical performance, they will be promising electrode materials for high-performance supercapacitors applications.

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

“…Table 1 gives the specific capacitance values of the two samples at different current density. The discharge specific capacitance of the Fe 2 O 3 -RGO electrodes at the current density of 1 A/g is 226 F/g, which is higher than the newly reported [51]. The remarkably increased capacitance of Fe 2 O 3 -RGO may be caused by the combination of electric double-layer capacitance of RGO and faradic pseudocapacitance of potential with an ac perturbation of 5 mV before charge process.…”

“…Among these metal oxides used as supercapacitor, the research on Fe 2 O 3 is relatively rare, however, Fe 2 O 3 is abundant, low cost, and nontoxic and is therefore deserves being investigated as supercapacitors [25,26]. Recently, lots of work, which focused on ferric nanocomposite, have been reported [27][28][29][30][31][32][33][34][35][36][37][38][39]. Among them, ferric and graphene nanocomposite are newly reported.…”

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

“…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.…”

“…[18][19][20][21][22] However, Fe 2 O 3 alone as nanoparticles suffer from severe issues like low conductivity, high agglomeration and structural degradation during the charge and discharge cycling process which causes rapid loss of capacity caused by volume changes. 21 In this respect, highly thermal and electrically conductive graphene or rGO has been considered as the suitable support matrix for metal oxides to absorb the volume changes and to enhance the structural stability of the electrodes. …”

Synthesis of the composites of graphene nanoplatelets/(Ni-Co) and their properties

“…The sensitivity of the devices and easiness of processing devices of graphene materials makes them attractive targets for research and future use. It is shown [3,4] that the actual development of hybrid composites is based on graphene or graphene oxide, comprised Fe2O3, ZnO, WO3, SnO2 and others.…”