α-Fe2O3 nanotubes-reduced graphene oxide composites as synergistic electrochemical capacitor materials

Abstract

We present a facile approach for the fabrication of a nanocomposite comprising α-Fe(2)O(3) nanotubes (NTs) anchored on reduced graphene oxide (rGO) for electrochemical capacitors (ECs). The hollow tubular structure of the α-Fe(2)O(3) NTs presents a high surface area for reaction, while the incorporation of rGO provides an efficient two-dimensional conductive pathway to allow fast, reversible redox reaction. As a result, the nanocomposite materials exhibit a specific capacitance which is remarkably higher (~7 times) than α-Fe(2)O(3) NTs alone. In addition, the nanocomposites show excellent cycling life and large negative potential window. These findings suggest that such nanocomposites are a promising candidate as negative electrodes in asymmetrical capacitors with neutral electrolytes.

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.…”

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

“…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.…”

A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/α-Fe2O3//ZnO/C Asymmetric Supercapacitor

“…9,11,12 Likewise, zinc oxide (ZnO) is an attractive material for solar cells owing to its higher electron mobility as compared to TiO 2 .…”

“…7,8 Hematite (α-Fe 2 O 3 ) is a promising negative electrode material for electrochemical capacitors (ECs) due to its high electrochem-ical activity, high theoretical-specific-capacitance, suitable negativepotential-window because of high hydrogen over-potential in aqueous electrolytes, mostly environment friendly and abundance in nature. [8][9][10][11] However, poor electrical conductivity (∼10 −14 S/cm) and short iondiffusion length limit its electrochemical performance significantly that can be overcome by creating oxygen vacancies within α-Fe 2 O 3 thin films. 9,11,12 Likewise, zinc oxide (ZnO) is an attractive material for solar cells owing to its higher electron mobility as compared to TiO 2 .…”

“…[8][9][10][11] However, poor electrical conductivity (∼10 −14 S/cm) and short iondiffusion length limit its electrochemical performance significantly that can be overcome by creating oxygen vacancies within α-Fe 2 O 3 thin films. 9,11,12 Likewise, zinc oxide (ZnO) is an attractive material for solar cells owing to its higher electron mobility as compared to TiO 2 . 13 ZnO also has the advantages of low cost, easy fabrication, environment friendliness and most importantly higher electronic conductivity (10 −3 to 1 S/cm) as compared to α-Fe 2 O 3 .…”