Ming Xu,Yu Ma,Lei Wang,Shu Huang,Liming Chen,Rong Liu,Zikun Li,Guohui Yuan
Transition metal selenides (TMS) have been used to prepare hundreds of electrode materials for ion batteries due to their superior theoretical capacity, but have been repeatedly limited by the sluggish reaction kinetics and the enormous volume change during the repeated charge/discharge process. Here, we report a facile strategy to fabricate organic–inorganic composites by engineering a unique chemical bonding interface between TMS and conductive polymers. For the first time, poly(3,4-ethylenedioxythiophene) (PEDOT) is utilized to encapsulate iron diselenide (FeSe 2 ) nanoparticles by in situ polymerization, and the Fe-S bonds are meanwhile formed at the interface of FeSe 2 and PEDOT. The experimental analysis demonstrates the stability of Fe-S bonds during the sodiation/desodiation process and after long cycling, which can serve as a “bridge” for fast charge transfer and also serve as a “rivet” to stabilize the composite structure. When used for sodium ion storage, the composite offers an exceptionally long lifetime of up to 17,000 loops at 10 A/g without capacity degradation. In addition, it delivers a high specific capacity of 490.4 mAh/g and retains 60 % when the current density is amplified 150 times. The assembled full cell also exhibits excellent cycling stability. This work will provide a feasible way to improve the metal oxide/sulfide/selenides for long-life ion batteries.
Guanwu Yin,Xiaofan Chen,Quanbo Xu,Xiaoyue Yang,Pengfei Zhang,Haiyan Wang
Antimicrobial peptides (AMPs) play a significant role in combating antimicrobial resistance. However, the applications of AMPs are constricted by insufficient stability under physiological conditions. Therefore, developing novel and effective antibacterial materials with AMPs is an urgent demand. In this study, magnetic mesoporous silica nanoparticles were fabricated through a facile method and stable modifications of AMPs through the bond formation of Fe-S in the mesopores. The resultant nanoparticles (denoted as Fe 3 O 4 @ m SiO 2 @CysHHC10) consisted of Fe 3 O 4 core, SiO 2 out layer with cylindrical mesoporous channels, and abundant CysHHC10 immobilized in the mesopores. Fe 3 O 4 @ m SiO 2 @CysHHC10 exhibited powerful antibacterial performance against both Gram-negative and Gram-positive bacteria. Also, owing to the CysHHC10 being sheltered with mesoporous channels, Fe 3 O 4 @ m SiO 2 @CysHHC10 retained almost more than 99.9% antibacterial efficiency for bacteria throughout nine cycles. Furthermore, the resultant nanoparticles exhibit favorable biocompatibility in vitro. This work provides a novel way for the fabrication of antibacterial magnetic materials with recyclable and durable antibacterial activity.
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