Nanostructured porous wires of iron cobaltite: novel positive electrode for high-performance hybrid energy storage devices

Abstract

Demand for more efficient energy storage systems stimulates research efforts to 9 seek and develop new energy materials with promising properties. In this regard, binary metal 10 oxides have attracted great attention due to their better electrochemical performance as compared 11 to their single oxide analogues. Herein, nanostructured porous wires of FeCo 2 O 4 have been 12 grown on nickel foam via a facile hydrothermal route and were employed as binder/additive-free 13 electrodes to investigate the electrochemical behavior of FeCo 2 O 4 as electrode materials for 14 supercapacitors. The FeCo 2 O 4 sample exhibits a high specific capacitance of 407 F g -1 at a scan 15 rate of 10 mV s -1 in initial cycling. After cycling for 2000 cycles, electro-activation of material 16 results in subsequent increase in capacitance up to 610 F g -1 , showing promising characteristics 17 of this material for energy storage. The performance of the prepared FeCo 2 O 4 sample is found to 18 2be much better than the corresponding single oxides. Furthermore, porous nanostructured 1 FeCo 2 O 4 //AC asymmetric supercapacitors were assembled and could achieve a high energy 2 density of 23 Wh kg -1 and a maximum power density of 3780 W kg -1 .3

Manganese dioxide decoration of macroscopic carbon nanotube fibers: From high-performance liquid-based to all-solid-state supercapacitors

“…As is seen, the capacitance increases during first 20 cycles and later decreases slightly, showing excellent cycling stability and Coulombic efficiency with almost no capacitance fading. Gradual capacitance increase specially at lower current densities has been previously seen and reported for metal oxide electrodes and their composites with carbon [49][50][51]. This increase in capacitance is ascribed to the electrochemical or structural activation caused by pore opening during charge-discharge cycles.…”

Direct growth of FeCo2O4 nanowire arrays on flexible stainless steel mesh for high-performance asymmetric supercapacitor

“…Obtained value of the capacitance is very high compared to previous results of the FeCo 2 O 4 electrode. [23][24][25] This is attributed to the hierarchical nanowire structure, Na 2 SO 4 electrolyte and SSM current collector. Also, the FCO100 thin film shows excellent electrochemical stability by maintaining 84.25% of its initial capacitance even after completing 5000 CV cycles (SI S7).…”

“…A few studies have reported the effects of FeCo 2 O 4 electrodes on performance of SCs and battery applications although limited capacity was still roadblock to be overcome. [23][24][25] In our study, we have designed a new high-performance asymmetric SCs using FeCo 2 O 4 nanowires and MnO 2 nanoparticles in thin film form as negative and positive electrodes, respectively, in aqueous 1 M Na 2 SO 4 electrolyte. Initially, the different nanostructures of FeCo 2 O 4 were directly grown on the stainless steel mesh (SSM) by simply tuning the reaction temperatures of precursor in hydrothermal method.…”

Mesoporous Nickel-Based Zeolite Capsule Complex with Fe3O4 as Electrode for Advanced Supercapacitor

“…From the electrochemical test results, the electrode is driven by a reversible Faraday oxidation-reduction reaction. According to previous work [38][39][40][41], the mechanism might base on the following reactions: Figure 8 shows a conjecture diagram of the nickel-based complex electrode redox reaction. The nickel foam, as a good substrate material, is very suitable as the electrode of supercapacitors.…”