Charge-storage mechanism of highly defective NiO nanostructures on carbon nanofibers in electrochemical supercapacitors

Abstract

An electrode composed of highly defective nickel oxide (NiO) nanostructures supported on carbon nanofibers (CNFs) and immersed in a Li+-based aqueous electrolyte is studied using Raman spectroscopy under dynamic polarization...

Transition metal dichalcogenide nanostructured electrodes without calcination for aqueous asymmetric supercapacitors

“…These superior features can enhance the transfer rate of the electrolyte ions while decreasing their diffusion resistance with an increase of electron pathways, resulting in superior capacities at the corresponding current densities. 41,59 The morphological synergistic contribution of the obtained uniform nanostructures and involved rapid redox reaction from the conducting metal boosted the greater capacity for the NMS/NS@CC-210 electrode. In the case of NS@CC-210, the sphere-like morphology on carbon fibers maintained less porous behavior (based on the TEM image) and absence of defects in its lattice structure, enabling less capacity when compared to the NMS/NS@CC-210 electrode.…”

“…According to BET results, the NMS/NS@CC‐210 electrode showed higher specific surface area due to its surface defects and impressive pore size distribution than the other two electrodes. These superior features can enhance the transfer rate of the electrolyte ions while decreasing their diffusion resistance with an increase of electron pathways, resulting in superior capacities at the corresponding current densities 41,59 . The morphological synergistic contribution of the obtained uniform nanostructures and involved rapid redox reaction from the conducting metal boosted the greater capacity for the NMS/NS@CC‐210 electrode.…”

“…In general, in layered TMDC materials, the defective sites are very active and absorb the site for foreign ions while minimizing the stress and electrostatic force among the layers, which can enhance the diffusivity and reduce the transportation paths in the hierarchical porous structure. 40,41 Herein, the appeared lattice defects and synergistic effect in the unique mixedphase NMS/NS@CC-210 heterostructure promoted the larger electrochemical active sites, enhanced the diffusivity of OH-electrolyte ions, and shortened the electron transportation paths. The optimized NMS/NS@CC-210 electrode showed improved reaction kinetics, rate capability, and cyclability compared to the other two MS@CC-210 and NS@CC-210 electrodes.…”

“…Interestingly, the mixed‐phase NMS/NS@CC‐210 sample consisting of plenty of defective lattice sites in its hierarchical flower‐like nanostructures was noticed. In general, in layered TMDC materials, the defective sites are very active and absorb the site for foreign ions while minimizing the stress and electrostatic force among the layers, which can enhance the diffusivity and reduce the transportation paths in the hierarchical porous structure 40,41 . Herein, the appeared lattice defects and synergistic effect in the unique mixed‐phase NMS/NS@CC‐210 heterostructure promoted the larger electrochemical active sites, enhanced the diffusivity of OH– electrolyte ions, and shortened the electron transportation paths.…”

Biomass‐derived ant colony‐like ion diffused redox porous carbon toward economical and high‐performance quasi‐solid‐state supercapacitor

“…19 The energy storage mechanism is greatly dependent on the interfacial charge separation across the electrolyte and electrode material. 20 The following is directly proportional to the active surface which may vary with size, geometry, and pore distribution. 21 The charging process does not include chemical reactions, leading to limited charge storage capability.…”