In the microelectronics era, electromagnetic radiation and thermal accumulation from electronic devices can detrimentally impact sensor performance and seriously damage human health. Despite the pressing need, synthesizing high-performance multifunctional composite remains a formidable challenge. Herein, we report the fabrication of heterostructured carbon fiber (CF)@SnO₂ nanosheet using CF as a template, followed by activation pretreatment, hydrothermal in-situ growth, and sulfur-oxygen substitution. This approach yielded CF reinforced polyether ether ketone (CF/PEEK) composites with enhanced interfacial performances, exceptional electromagnetic interference (EMI) shielding effectiveness, and high thermal conductivity (TC). The interlaminar shear strength (ILSS) of the composite achieved a remarkable 87.86 MPa, underscoring the robust interfacial integration that significantly bolsters EMI shielding and TC. As a result, the composite demonstrated a notable enhancement in EMI shielding effectiveness and TC by 22.85% and 52.83%, respectively. The strategy of integrating structural and functional elements is instrumental in the advancement of innovative high-performance multifunctional composite. These composites are poised to serve not only as critical structural components in aerospace applications but also to extend their utility into the realm of precision electronics, offering a promising horizon for future technological innovations.

Adsorption agents are an important class of solid hydrogen storage materials. Attributed to their high specific surface area and adjustable nanopore structure, activated carbon nanofibers have attracted extensive attention in the application of solid hydrogen storage. The research in this field mostly focuses on applications with a hydrogen pressure condition of 30 to 300 bar, while there have been few systematic studies on the hydrogen storage performance of these materials under ambient pressure. In this study, polyacrylonitrile-based activated carbon nanofibers were constructed by electrospinning technology and ultrasonic-assisted activation technology for the application of atmospheric hydrogen storage. Their nanopore structure was revealed to be mainly composed of micropores, and the relative contents of micropore volume and ultramicropore volume were 77.92% to 88.3% and 22.34% to 24.68%, respectively. Attributed to the synergy of rich microporous structure and surface chemical structure, the atmospheric hydrogen storage density of activated carbon nanofibers could reach 2.64 wt% at 77 K and 1 bar. After the optimization analysis of adsorption isotherm models, the Multisite-Langmuir model was found as more suitable for accurately describing the atmospheric hydrogen adsorption process of activated carbon nanofibers.