Uniformly Dispersed ZnFe2O4 Nanoparticles on Nitrogen-Modified Graphene for High-Performance Supercapacitor as Electrode

Abstract

A facile strategy has been adopted for the preparation of ZnFe2O4/NRG composite by anchoring ultrasmall ZnFe2O4 nanoparticles on nitrogen-doped reduced graphene (denoted as NRG) for high-performance supercapacitor electrode. Remarkably, the growth of ZnFe2O4 nanocrystals, the reduction of graphitic oxide and the doping of nitrogen to graphene have been simultaneously achieved in one process. It is found that the NRG employed as substrate can not only control the formation of nano-sized ZnFe2O4, but also guarantee the high dispersion without any agglomeration. Benefiting from this novel combination and construction, the hybrid material has large surface area which can provide high exposure of active sites for easy access of electrolyte and fast electron transport. When served as supercapacitor electrode, the ZnFe2O4/NRG composite exhibits a favorable specific capacitance of 244 F/g at 0.5 A/g within the potential range from −1 to 0 V, desirable rate stability (retain 131.5 F/g at 10 A/g) and an admirable cycling durability of 83.8% at a scan rate of 100 mV/s after 5000 cycles. When employed as symmetric supercapacitor, the device demonstrates favorable performance. These satisfactory properties of the ZnFe2O4/NRG composite can make it be of great promise in the supercapacitor application.

Zinc Ferrite Anchored Multiwalled Carbon Nanotubes for High‐Performance Supercapacitor Applications

“…The high‐resolution Fe 2p spectrum (Figure b) has two major peaks at binding energies (BEs) 724.64 and 711.05 eV, which are associated with Fe 2p 1/2 and Fe 2p 3/2 , respectively. The spin energy separation is 13.59 eV, which is a characteristic feature of the iron oxidation state in ZFO and is in good agreement with previously reported values . A small satellite peak is also observable .…”

“…Among the MTMOs, ZnFe 2 O 4 stands out as a potential anode material owing to its high theoretical capacity (ca. 1000 mAh g –1 ), low cost, low toxicity, and construction from environmentally friendly elements . Nevertheless, low conductivity and poor stability limit the use of this material in practical applications.…”

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

“…Supplementary Figure 6(c) showed the binding energies of Cu 2p 3/2 (933.90 eV) and Cu 2p 1/2 (953.76) with two satellites confirming the presence of Cu 2+ ions in CuF www.nature.com/scientificreports www.nature.com/scientificreports/ photocatalyst 28 . Supplementary Figure 6(d) showed two peaks at 1020.37 eV and 1043.50 eV for Zn 2+ corresponding to Zn 2p 3/2 and Zn 2p 1/2 , respectively for ZnF photocatalyst 29 .…”

Synthesis of multifunctional CuFe2O4–reduced graphene oxide nanocomposite: an efficient magnetically separable catalyst as well as high performance supercapacitor and first-principles calculations of its electronic structures

“…16,24 Electrochemical double layer electrodes (EDL) and pseudocapacitor electrodes are two prominent class of supercapacitor. [25][26][27] Use of EDL electrode in the AIRBUS A380 is one of the examples of the commercial applications of the supercapacitor. 28 However, most of the EDL electrodes suffer from lower energy density than batteries, which oen limits their wide application.…”