Lightweight, flexible, ultrahigh-performance electromagnetic-interference (EMI) shielding materials are urgently required in the areas of aircraft/aerospace, portable and wearable electronics. Herein, 1D carbon nanotubes (CNT) and carbon nanofibers (CNF) with 2D edge-rich graphene (ERG) are used to form a lightweight, flexible CNT-ERG-CNF hybrid foam. This foam was fabricated through a self-sacrificial templating chemical vapor deposition process, where nanocarbons bond through covalent bonding, forming a hierarchical 3D hybridized carbon nanostructure. Multistage conductive networks and heterogeneous interfaces were constructed using edge-rich nanocarbons to increase the induced currents and interfacial polarization which makes great contributions to achieve high absorption electromagnetic shielding effectiveness (SE_A). The CNT-ERG-CNF hybrid foam exhibits EMI shielding effectiveness (SE) exceeding 55.4 dB in the X-band while the specific SE (SSE, SE divided by mass density) achieves 9200 dB cm³ g^-1, which surpasses that of nearly all other carbon-based composite materials. Furthermore, the structural stability and durability of the flexible CNT-ERG-CNF hybrid foams is examined by measuring EMI SE after 10000 times cyclic bending. Remarkably, this work not only provides a new idea for preparing hierarchical carbon materials for a wide range of applications, but presents some fundamental insights for achieving higher absorption losses in EMI shielding materials.

在飞机/航空航天，便携式和可穿戴电子设备领域迫切需要轻巧，柔性，超高性能电磁干扰（EMI）屏蔽材料。在此，一维碳纳米管（CNT）和碳纳米纤维（CNF）与2D富边缘石墨烯（ERG）用于形成轻质，柔性的CNT-ERG-CNF混合泡沫。这种泡沫是通过自我牺牲模板化学气相沉积工艺制造的，其中纳米碳通过共价键结合，从而形成分层的3D杂化碳纳米结构。使用富含边缘的纳米碳构建多级导电网络和异质界面，以增加感应电流和界面极化，为实现高吸收电磁屏蔽效果做出了巨大贡献（SE _A）。CNT-ERG-CNF混合泡沫在X波段的EMI屏蔽效果（SE）超过55.4 dB，而特定SE（SSE，SE除以质量密度）达到9200 dB cm ³  g ^-1，几乎超过所有其他碳基复合材料。此外，在10000次循环弯曲后，通过测量EMI SE来检查柔软的CNT-ERG-CNF混合泡沫的结构稳定性和耐久性。值得注意的是，这项工作不仅为制备适用于各种应用的分层碳材料提供了新思路，而且为在EMI屏蔽材料中实现更高的吸收损耗提供了一些基本见解。