Preparation of Three-Dimensional Mo₂C/NC@MXene and Its Efficient Electromagnetic Absorption Properties

Abstract

The positively charged MoO 3 /PDA microspheres are obtained by stacking and assembly of the sheet structure, and the negatively charged MXene nanosheets are wrapped on the surface through the principle of electrostatic self-assembly. After annealing, a nitrogen-doped carbon composite and a MXene-coated Mo 2 C wave absorber are obtained. The formation of the wrinkled surface provides a complex pore structure, and the multiple interface reflections between the nanosheets enhance the absorption performance. The existence of heterogeneous interfaces and the uneven distribution of space charges accumulated between the interfaces effectively reduce the minimum reflection loss (RL min ). This work explores the effects of the ratio between MoO 3 /PDA and MXene nanosheets and loading amount on the microwave absorption properties. Mo 2 C/NC@MXene-2 obtained when the ratio of the two is 3:1 has the best absorption performance under 25% loading. The RL min is −59.36 dB, and the corresponding effective absorption bandwidth (EAB) is 4.6 GHz at 2.5 mm. This work expands the new applications of MXenebased and Mo 2 C-based materials and has a guiding significance for the design of electrostatic self-assembly materials.

Sulfur-Doped MXene-Based Nanocomposites for Efficient Electromagnetic Wave Absorbers via Polarization and Magnetization

“…By comparison, it could be seen that when the content of Ag particles in nanocomposites was low, it had better electromagnetic wave absorption performance. The absorptive properties of composites recently reported in the literature studies were compared (Figure S9), and the comparison showed that S-MXene (TiO 2 )/Ag/CoNi nanocomposites exhibited better absorbing properties and greater application prospects than other reported materials. − The effective bandwidth of S1-45 wt % at a thickness of 2.4 mm was 5.6 GHz, and the minimum reflection loss of −80.9 dB (S3-55 wt %) could be achieved after adjusting the component content.…”

Developing a MXene quantum dot-based separator for Li–S batteries

“…Based on the previous work, 31 MXene was obtained by etching with concentrated hydrochloric acid (HCl, 36–37%, Sinopharm Chemical Reagent Co. Ltd) and lithium fluoride (LiF, 99%, Sinopharm Chemical Reagent Co., Ltd). First, 10 mL MXene was dispersed in 70 mL deionized water.…”

Metal Ions Confined in Periodic Pores of MOFs to Embed Single‐Metal Atoms within Hierarchically Porous Carbon Nanoflowers for High‐Performance Electromagnetic Wave Absorption

“…In the meanwhile, the defect sites are formed around the pore edges, which can serve as the polarization sites to increase the polarization losses of 3D HPCs and improve the EMW absorption performance. [8][9][10] Furthermore, the large pore volume endows the 3D HPCs with a low mass density, which benefits to the construction of lightweight EMW absorbers. [11] Nevertheless, a further improvement of the dielectric losses in 3D HPCs with the aim of enhancing the EMW absorption performance of related materials still faces a huge challenge due to a lack of sufficient polarizable centers.…”