NiO/Ni Heterojunction on N‐Doped Hollow Carbon Sphere with Balanced Dielectric Loss for Efficient Microwave Absorption

Abstract Hollow carbon spheres are potential candidates for lightweight microwave absorbers. However, the skin effect of pure carbon‐based materials frequently induces a terrible impedance mismatching issue. Herein, small‐sized NiO/Ni particles with heterojunctions on the N‐doped hollow carbon spheres (NHCS@NiO/Ni) are constructed using SiO 2 as a sacrificing template. The fabricated NHCS@NiO/Ni displayed excellent microwave absorbability with a minimum reflection loss of −44.04 dB with the matching thickness of 2 mm and a wider efficient absorption bandwidth of 4.38 GHz with the thickness of 1.7 mm, superior to most previously reported hollow absorbers. Experimental results demonstrated that the excellent…

• NN
  National Natural Science Foundation of China

  Award: 51972077
• FR
  Fundamental Research Funds for the Central Universities

  Awards: 3072022CF2504, 3072022QBZ2502, 3072022TS2507