Novel Moringa oleifera Leaves 3D Porous Carbon-Based Electrode Material as a High-Performance EDLC Supercapacitor

Abstract

Biomass-based activated carbon has great potential in the use of its versatile 3D porous structures as an excellent electrode material in presenting high conductivity, large porosity, and outstanding stability for electrochemical energy storage devices. In this study, the electrode material develops through a novel consolidated carbon disc binder-free design, which was derived from Moringa oleifera leaves (MOLs) for electrochemical double-layer capacitor applications. The carbon discs are prepared in a series of treatments of precarbonized, chemical impregnation of zinc chloride, integrated pyrolysis of N 2 carbonization, and CO 2 physical activation. The physical activation temperatures applied at 650, 750, and 850 °C optimize the precursor potential. By optimizing the 3D hierarchical pore properties of the MOL750, the carbon disc binder-free design demonstrates optimal symmetric supercapacitor performance with a high specific capacitance of 307 F g −1 at a current density of 1 A g −1 in an aqueous electrolyte solution of 1 M H 2 SO 4 . Furthermore, the extremely low internal resistance (0.006Ω) of the carbon disc initiated excellent electrical conductivity. The supercapacitors also maintain their high capacitive properties in aqueous electrolyte solutions of 6 M KOH and 1 M Na 2 SO 4 , respectively. The results show that a novel consolidated carbon disc binder-free design can be obtained from biomass MOLs through a reasonable approach to develop superior electrode materials to enhance high-performance electrochemical energy storage devices.

MnO2 Nanoparticle‐Loaded Self‐Doped (N/O) Porous Carbon Derived from Orychophragmus Violaceus for Application as a High‐Performance Supercapacitor

“…Figure 2b the OPC@MnO 2 32. Obviously, the MnO 2 nanoparticles are densely and uniformly distributed on the OPC surface, and their sizes are larger than the diameter of the MnO 2 particles on the OPC@MnO 2 16. Furthermore, it can also be observed from Figure 2g that MnO 2 nanoparticles are not only distributed on the surface of the carbon material, but also grow in the pore structure of the carbon material, and its presence can provide extra active sites.…”

Two biomass material-derived self-doped (N/O) porous carbons from waste coriander and lilac with high specific surface areas and high capacitance for supercapacitors

“…25 Finally, under high pressure, a slight increase in the N 2 adsorption of the two suggests the presence of macropores in both the materials. 20,29 Apparently, the presence of more pronounced spikes in CPC-600 indicates that it has more macropores than LPC-600. As expected, LPC-600 has a specific surface area of up to 2565 m 2 g À1 , which is larger than that of CPC-600 (2464 m 2 g À1 ).…”

“…17,22 Macropores can store electrolytes, thereby shortening the electrolyte transfer path. 29 In short, the two porous carbon materials with a large pore size and high specific surface area are beneficial for obtaining high electrical storage properties.…”

Formation of Carbon-Incorporated NiO@Co3O4 Nanostructures via a Direct Calcination Method and Their Application as Battery-Type Electrodes for Hybrid Supercapacitors

“…Nowadays, the shortage of fossil fuel resources, environmental problems, and rapid economic growth have greatly increased the demand for sustainable and efficient energy storage technologies. − Among various energy storage devices, lithium-ion batteries (LIBs) and supercapacitors (SCs) have been extensively investigated . LIBs have the advantages of high energy density and low self-discharge; however, their widespread application is hampered by long charging time, short cycle life, and low power density. − Compared with LIBs, supercapacitors (SCs) can provide high power density but have relatively low energy density. − Therefore, it is urgent to find energy storage devices with high energy and power density to fill the gap between LIBs and SCs. − …”

“… 6 − 10 Compared with LIBs, supercapacitors (SCs) can provide high power density but have relatively low energy density. 11 − 14 Therefore, it is urgent to find energy storage devices with high energy and power density to fill the gap between LIBs and SCs. 15 − 17 …”