Boosting the electrochemical properties of CoCo₂O₄ porous nanowire arrays by microwave-assisted synthesis for battery–supercapacitor hybrid devices

Abstract

Cobalt oxide (CoCo2O4) porous nanowires are synthesized by a microwave assisted hydrothermal process (MHP) and the followed annealing. It is found that the introduction of microwave assistance led to an...

Microwave‐Assisted Rational Designed CNT‐Mn3O4/CoWO4 Hybrid Nanocomposites for High Performance Battery‐Supercapacitor Hybrid Device

“…The above mentioned preferred crystal planes deviation and lattice distortion may be attributed to the unique “microwave effect”. [ 18 ] Note that, the presence of CNT‐Mn 3 O 4 component does not affect the crystal structure of the CoWO 4 precursor. Further, by comparing the XRD patterns of CNT‐Mn 3 O 4 /CoWO 4 precursor and CNT‐Mn 3 O 4 /CoWO 4 in Figure 2b, it can be found that, the preferred crystal orientation and the left‐shift of peak position still exist after annealing in nitrogen atmosphere.…”

Metal-Free On-Chip Battery–Supercapacitor Hybrid System Based on Rationally Designed Highly Conducting Laser-Irradiated Graphene-Based Electrodes

“…Furthermore, the GCD profile was also taken at different current densities ranging from 10 to 80 mA cm –2 , which shows the oxidation and reduction reactions occurred at the battery electrode (LIG@MnO 2 ) and a sharp voltage plateau at 1.89 V. The calculated capacity for the solid-state BSH system is calculated to be 2.97 mA h cm –2 and achieved a high cell voltage of ∼1.9 V. The maximum normalized energy density and power density of the BSH system were calculated to be 5.9 and 160 mW cm –2 (Figure d), which are the comparable outcomes among many reported BSH and hybrid supercapacitors (HSC) systems (Table S3). − Furthermore, the rate capability of the LIG@MnO 2 //PPy@LIG cell was tested via performing galvanostatic charge–discharge at different current densities (varying current density from 10 to 80 mA cm –2 and back to 10 mA cm –2 ) as shown in Figure e. The 8 times increase in the current density achieved a capacity retention of 68% indicating good rate capability of the electrode materials and the corresponding device (Figure S7).…”

High Dispersion FeFe2O4 nanoparticles synthesis and its Oxygen Reduction Reaction catalytic performance

“…Fuel cell, as a novel kind of clean energy technology, had drew worldwide attention because of the high energy density/ conversion, flame/noise-free, and zero pollution. [1][2][3][4] Due to the kinetically sluggish of oxygen reduction reaction (ORR), Pt and its alloys were identified as the most promising electrocatalysts, [5][6][7] but their application was limited because of high cost, restrictive global reservation, poor endurance, easy toxicosis etc. [8,9] Therefore, great efforts had been made to develop an effective and low costs ORR electrocatalyst such as noble metal alloy-based materials, [10][11][12] metallic oxide-based materials, [13][14][15] and heteroatom-doped carbon-based materials etc.…”

“…Fuel cell, as a novel kind of clean energy technology, had drew worldwide attention because of the high energy density/conversion, flame/noise‐free, and zero pollution [1–4] . Due to the kinetically sluggish of oxygen reduction reaction (ORR), Pt and its alloys were identified as the most promising electrocatalysts, [5–7] but their application was limited because of high cost, restrictive global reservation, poor endurance, easy toxicosis etc [8,9] .…”