Facile synthesis of crumpled-paper like CoWO4-CoMn2O4/N-doped Graphene hybrid nanocomposites for high performance all-solid-state asymmetric supercapacitors

Flexible Free-Standing Electrode of Nickel–Manganese Oxide with a Cracked-Bark Shape Composited with Aggregated Nanoparticles on Carbon Cloth for High-Performance Aqueous Asymmetric Supercapacitors

“…Figure d exhibits the Ragone plot of our AASC, as well as a comparison with the devices having similar material system. A maximum E of 0.489 mWh cm –2 (at 0.800 mW cm –2 ) while still maintaining ∼0.223 mWh cm –2 even at 8.00 mW cm –2 for our AASC can be obtained, exhibiting the competitive performance compared with the reported devices having the similar material system, such as MnCo 2 O 4 @NiMoO 4 //AC, carbon nanotubes@Ni 3 V 2 O 8 @NiCo 2 S 4 //AC, Ni 3 S 2 @Mn­(OH) 2 //AC, NCO@NCMS//AC, MnO 2 @CoS//AC, CoMoO 4 –HMPA//AC, s-NiCoOH//AC, Mn 1 –x Ni x Co 2 O 4 //AC, and Co 3 O 4 @NiMoO 4 //AC, NiAl LDH-rGO//Zn HBCs, and NiCo 2 O 4 @Co 0.33 Ni 0.67 (OH) 2 //CMK …”

“…Figure c depicts the CV characterization of the NMO electrode in 0.0–0.8 V at 5–50 mV s –1 , and the well-kept shape with the scan rate indicates the good pseudocapacitive performance because of the fast redox reaction of the electrode. Furthermore, shift of the redox peaks to lower/higher potentials with the scan rate reveals that charge transport in the electrolyte is the limiting factor for charge storage, rather than the redox reaction. − The change of the redox peak current ( i p ), for the electrode of NMO, with the square root of the scan rate v 1/2 is depicted in Figure d. The linear dependency of i p on v 1/2 suggests that charge storage primarily follows the diffusion-controlled mechanism, rather than surface adsorption. − …”

High-Entropy Oxide Nanofibers as Catalytic Host Promising High Volumetric Capacity of Sulfur-Based Composites for Lithium–Sulfur Batteries

“…Similarly, CWO also has a nanofiber morphology with a diameter of about 500 nm, as confirmed by SEM images (Figure S1). The XRD pattern of HE-CWO and CWO nanofibers is shown in Figure c, and all peaks of HE-CWO nanofibers as well as CWO match with the PDF card (JCPDS 15-0867) and demonstrate a typical orthorhombic structure, which proves the high purity of both HE-CWO and CWO nanofibers. This observation suggests that the other metal cations (Ni, Mn, Cu, and Zn) of HE-CWO perform the disordered occupation in the lattice of the Co cation, forming a single-phase, highly stable entropy oxide.…”

KOH mediated hydrothermally synthesized hexagonal‐CoMn 2 O 4 for energy storage supercapacitor applications

“…Our results are consistent with previous studies on CoMn 2 O 4. 20‐23 Figure 10D depicts the conceivable communication between the hexagonal‐shaped‐CoMn 2 O 4 electrode material and electrolyte ions. The hexagonal‐shaped morphology's high surface area promotes the exertion/diffusion of electrolyte ions into the electrode, implying an increased ion transport rate.…”

“…For example, Xu et al studied CoMn 2 O 4 nanowires with a higher specific capacitance value of 2108 F/g at 1 A/g 20 . Researchers are also investigating the electrochemical performance of CoMn 2 O 4 with different morphologies such as flower‐like CoMn 2 O 4 producing a specific capacitance of 188 F/g, 21 3D honeycomb‐like Ni foam/nitrogen‐doped graphene/CoMn 2 O 4 with specific capacity of 527 C/g at 1 A/g, 22 crumpled‐paper like CoWO 4 ‐CoMn 2 O 4 ‐N‐doped graphene nanocomposites delivered higher specific capacitance of 4133.3 F/g at 2 A/g 23 . Cubic CoMn 2 O 4 supported on Ni foam was also synthesized via a hydrothermal route and delivered a maximum capacity of 140.6 mAh/g at 1 mA/cm 2 24 …”