Preparation method of nitrogen-doped porous carbon coated hollow cobalt-nickel alloy composite wave-absorbing material

The invention discloses a preparation method of a nitrogen-doped porous carbon coated hollow cobalt-nickel alloy composite wave-absorbing material. CoNi@poly-dopamine is used as a template, dopamine hydrochloride is subjected to in-situ polymerization on a hollow CoNi alloy, and then the nitrogen-doped porous carbon shell coated hollow CoNi alloy composite wave-absorbing material is formed through high-temperature calcination. The composite wave-absorbing material shows excellent microwave absorbing performance under the condition that the thickness is small, the frequency is 12.8 GHz, the matching thickness is 2.0 mm, the optimal RL value can reach-47.1dB, the frequency bandwidth is 4.52 GHz, the wave-absorbing performance is excellent, and the application value is very high. The preparation method is simple in preparation process, uniform in compounding, stable in material performance, low in production cost and suitable for industrial production. 本发明氮掺杂多孔碳包覆空心钴镍合金复合吸波材料的制备方法以CoNi@聚多巴胺为模板，将盐酸多巴胺在空心CoNi合金上原位