Hierarchical Fe2O3 hexagonal nanoplatelets anchored on SnO2 nanofibers for high-performance asymmetric supercapacitor device

Abstract

Metal oxide heterostructures have gained huge attention in the energy storage applications due to their outstanding properties compared to pristine metal oxides. Herein, magnetic Fe2O3@SnO2 heterostructures were synthesized by the sol–gel electrospinning method at calcination temperatures of 450 and 600 °C. XRD line profile analysis indicated that fraction of tetragonal tin oxide phase compared to rhombohedral hematite was enhanced by increasing calcination temperature. FESEM images revealed that hexagonal nanoplatelets of Fe2O3 were hierarchically anchored on SnO2 hollow nanofibers. Optical band gap of heterogeneous structures was increased from 2.06 to 2.40 eV by calcination process. Vibrating sample magnetometer analysis demonstrated that increasing calcination temperature of the samples reduces saturation magnetization from 2.32 to 0.92 emu g-1. The Fe2O3@SnO2-450 and Fe2O3@SnO2-600 nanofibers as active materials coated onto Ni foams (NF) and their electrochemical performance were evaluated in three and two-electrode configurations in 3 M KOH electrolyte solution. Fe2O3@SnO2-600/NF electrode exhibits a high specific capacitance of 562.3 F g-1 at a current density of 1 A g-1 and good cycling stability with 92.8% capacitance retention at a high current density of 10 A g-1 after 3000 cycles in three-electrode system. The assembled Fe2O3@SnO2-600//activated carbon asymmetric supercapacitor device delivers a maximum energy density of 50.2 Wh kg-1 at a power density of 650 W kg-1. The results display that the Fe2O3@SnO2-600 can be a promising electrode material in supercapacitor applications.

Microporous α‐Fe2O3@NiO Heterostructures Synthesized for Enhanced Supercapacitor Performance

“…These observed planes are attributed to the hexagonal crystal phase of α-Fe 2 O 3 (JCPDS card no. : 33-0664) with the space group of R-3c, 167 [47] and their crystal structures are found to match well with previously reported references. [29,33,48] Therefore, the results suggest that the α-Fe 2 O 3 sample has a well-defined crystal structure.…”

Advances in Sno₂-Based Nanomaterials for Photocatalysis, Supercapacitors, and Antibacterial Activities

“…After 5000 GCD cycles, the electrode's columbic efficiency was determined to be 98%. Fe2O3/SnO2 nanocomposite was employed as an electrode material for SCs by Safari et al [91]. In a three-electrode system, the Fe2O3/SnO2 electrode exhibited excellent cycling stability, with 92.8 % capacitance retention at a high current density of 10 A/g after 3000 cycles.…”

Novel electrospun bead-like Ag2MoO4 nanofibers coated on Ni foam for visible light-driven heterogeneous photocatalysis and high-performance supercapacitor electrodes

“…[1][2][3] Supercapacitors are an attractive energy storage solution due to their ease of maintenance, environmental friendliness, safety, robustness, high power density, and high capacitance. [4][5][6] The performance of supercapacitors is heavily influenced by the electrode material, which should exhibit superior conductivity, excellent stability, high specific surface area, and exceptional reversibility, and use low-cost and abundant materials. 5,7 The photocatalytic activity of semiconductors is a promising clean energy technology and environmental remedy, with efficient photocatalysts characterized by wideranging photoabsorption and low recombination rates of electrons and holes.…”