Lu JiaYu,Yu Jin,Jiang Ziqing,Zhang Yan,Zhang Hao,Yu Yihao,Qi Dongming,Wang Jianming
With the escalating prevalence of electromagnetic radiation pollution, flexible electromagnetic interference (EMI) shielding materials hold immense potential for widespread application. Carbonized fabric possesses notable advantages such as flexibility, excellent electrical conductivity, and chemica l stability. However, its traditional preparation process is characterized by high energy consumption, intricate atmospheric conditions, and prolonged duration. This study introduces a novel approach of incorporating intumescent flame retardant (IFR) into cotton fabric, aiming to facilitate rapid carbonization in an air atmosphere. Remarkably, this innovative approach yields an outstanding total EMI shielding effectiveness (SE T ) of 17.55 dB within a mere 5 min carbonization process at 900 °C under ambient air conditions. Moreover, in order to enhance the shielding effect, we conducted in-situ growth of polypyrrole (PPy) on the prepared carbonized fabric. The deposition time of 120 min resulted in an impressive SE T value of 28.22 dB, effectively providing a shielding capability of up to 99.9% against electromagnetic waves (EMW). Moreover, the SE T value of IFR-C-PPy-60 min can be enhanced to 51.84 dB by stacking 4 layers, enabling the attenuation of 99.999% of EMW. The IFR-C-PPy also demonstrated exceptional fire safety and thermal stability. This study presents a novel approach for the rapid and large-scale fabrication of highly efficient conductive carbonized fabric, which demonstrates potential applications in flexible electronic devices. Graphical abstract
Dong Ziming,Dou Jiali,Ye Lin,Jiang Xihuan,Jiao Luwen,Liu Xiaojie,Wang Song
Slow carbonization (SC) and fast carbonization (FC) methods were applied and compared during the preparation of carbon materials using potassium citrate as raw material. The porous carbon material obtained by the SC method (SCPC800) had a slightly higher specific surface area than that obtained by the FC method (FCPC800). When SCPC800 was applied in the construction of a zinc–ion capacitor (ZIC), the obtained ZIC displayed a high mass specific capacitance (MSC) value of 309.5 F g −1 and a specific energy of 155.2 Wh kg −1 at the 0.2 A g −1 current density. FCPC800 showed similar electrochemical performance as SCPC800. The ZIC with the FCPC800 as electrode exhibited an MSC value of 300.7 F g −1 with a specific energy of 150.8 Wh kg −1 at the 0.2 A g −1 current density. Meanwhile, the SCPC800 and FCPC800-based ZICs showed good rate capability and cycle stability. Compared with the SC method, the FC method showed a significant advantage in reducing sample preparation time, which can greatly increase the preparation efficiency and reduce energy consumption. Therefore, as an efficient method, the FC method showed broad application prospects in the preparation of carbon materials for ZIC. Graphical Porous carbon materials prepared from potassium citrate for zinc-ion capacitor
危险品化学品经营许可证（带存储）