Preparation of nickel doped mesoporous carbon for enhanced microwave absorption performance

Heteroatom-Doped Nickel Oxide Hybrids Derived from Metal–Organic Frameworks Based on Novel Schiff Base Ligands toward High-Performance Electrochromism

“…In comparison, N-C@NiO#1 fabricated via the direct pyrolysis exhibited a higher specific surface area, which is beneficial for increasing the contact area between the electrolyte and the electrode material, as well as the bulk density of the electrode material, rendering a larger transmittance contrast. Whereas the two-step fabricated N-C@NiO#2 presented more narrower pore distributions (2.1, 4.6, and 6.9 nm of pore sizes for N-C@NiO#1, while 2.1, 2.5, 3.1, 3.5, 5.1, and 7.0 nm of pore sizes for N-C@NiO#2 are seen in Figure e,f), whose hierarchical porous structure with a nanometer particle size could effectively mitigate the volume expansion of the electrode materials during the OH – ion intercalation/deintercalation and therefore improve the cycle stability …”

“…Whereas the two-step fabricated N-C@NiO#2 presented more narrower pore distributions (2.1, 4.6, and 6.9 nm of pore sizes for N-C@ NiO#1, while 2.1, 2.5, 3.1, 3.5, 5.1, and 7.0 nm of pore sizes for N-C@NiO#2 are seen in Figure 3e,f), whose hierarchical porous structure with a nanometer particle size could effectively mitigate the volume expansion of the electrode materials during the OH − ion intercalation/deintercalation and therefore improve the cycle stability. 38 The Ni-MOF powders can be obtained by the dropwise addition of metal ions into the PSB ligand solution, and the SEM images of the as-prepared Ni-MOF powders (dispersed in methanol in advance) with different magnifications are exhibited in Figure 3a. The microstructural reorganization of Ni-MOF revealed to be uniformly distributed microrods with an average length of approximately 2 μm.…”

Morphology-Controlled Fabrication Strategy of Hollow Mesoporous Carbon Spheres@f-Fe2O3 for Microwave Absorption and Infrared Stealth

“…Highly dispersed hollow mesoporous carbon spheres (HMCS) are effective structural supports with excellent absorption capability. , On the one hand, the key advantages of carbon components derived from three-dimensional (3D) polymers include excellent dielectric loss and stable shape. On the other hand, internal cavities and mesopores can increase reflection attenuation, which is a considerable way to enhance absorption. , In addition, both the surface effect and the microscale effect of the mesoporous material lower the infrared emissivity, and the continuity of heat-transport channels is interrupted due to the existence of high-density gaseous voids, which contribute to the reduced thermal conductivity and the improved thermal insulation. , However, the dispersion characteristics of carbon-based absorbers at high frequencies limit the improvement of MA performance, suggesting that the introduction of semiconductors with stable dielectric properties may be an effective solution …”

Quadrangular cone carbon-constructed effective 3D network for a lightweight and broadband microwave absorbent

“…[8][9][10] There is an urgent need to develop high-performance absorbers with desirable properties such as light weight, strong absorption, thin coating and wide absorption bands. [11][12][13] Carbon materials, such as graphene, 14 carbon fibers, 15 carbon nanotubes, 16 and porous carbon, 17 are widely used as electromagnetic wave-absorbing materials because of their low cost, high chemical stability, low density, and wide range of sources. [18][19][20] However, the impedance mismatch problem caused by the high conductivity and large complex dielectric constant of pure carbon materials cannot meet the requirements of ideal wave absorbers.…”