Qingqing Wang

Covalent organic frameworks (COFs) with abundant redox‐active sites are promising electrode materials for sodium‐ion batteries (SIBs). However, conventional design strategies are often limited by sluggish Na ⁺ transport and low utilization of active sites. Here, we report a pair of 3D COFs (COF‐O and COF‐H). In COF‐O, the C═O groups are precisely oriented toward the pore channels, allowing the O atoms to serve as effective Na ⁺ storage sites. In contrast, COF‐H contains only C–H groups within the pores, which lack Na ⁺ storage capability. When employed as an anode material in SIBs, COF‐O exhibits a high specific capacity of 318 mAh/g (1.9 times that of COF‐H) and excellent cycling stability over 6000 cycles. In situ spectroscopic studies combined with theoretical calculations reveal that the C═O groups in COF‐O act as efficient Na ⁺ storage sites, effectively enhancing the capacity and accelerating Na ⁺ transport kinetics. This work demonstrates that precisely orienting functional groups in 3D COFs can create effective ion transport channels, providing a promising strategy for designing advanced organic electrode materials for SIBs.

Covalent organic frameworks (COFs) with abundant redox‐active sites are promising electrode materials for sodium‐ion batteries (SIBs). However, conventional design strategies are often limited by sluggish Na ⁺ transport and low utilization of active sites. Here, we report a pair of 3D COFs (COF‐O and COF‐H). In COF‐O, the C═O groups are precisely oriented toward the pore channels, allowing the O atoms to serve as effective Na ⁺ storage sites. In contrast, COF‐H contains only C–H groups within the pores, which lack Na ⁺ storage capability. When employed as an anode material in SIBs, COF‐O exhibits a high specific capacity of 318 mAh/g (1.9 times that of COF‐H) and excellent cycling stability over 6000 cycles. In situ spectroscopic studies combined with theoretical calculations reveal that the C═O groups in COF‐O act as efficient Na ⁺ storage sites, effectively enhancing the capacity and accelerating Na ⁺ transport kinetics. This work demonstrates that precisely orienting functional groups in 3D COFs can create effective ion transport channels, providing a promising strategy for designing advanced organic electrode materials for SIBs.

Fluid sensing can realize noninvasive measurement and provide continuous, real-time physiological information, which shows great potential in the field of precision medicine. However, developing efficient, sensitive, convenient fluid sensors has become the key research direction at present. This study introduces a unique wearable fiber Zinc-air battery (ZAB) with a humidity response and liquid monitoring properties. The battery features a eutectic gel polymer serving as not only the battery electrolyte but also the induction element for humidity response and liquid monitoring. Besides, the gel electrolyte exhibits high water retention with a high electrolyte retention rate of 94.2% in a dry environment, as well as outstanding mechanical strength with a fracture strength of 16.1 kPa and elongation at break of 541%. Moreover, the structural flexibility of the battery allows it to withstand complex deformation, and the good conformal properties of the eutectic gel electrolyte exhibit excellent durability. Surprisingly, the fiber ZAB can be successfully woven into the fabric to provide a stable power supply for a small digital watch, and the fiber battery can also respond to the amount of urine in the diaper. This study provides an idea for wearable physiological monitoring.

The problem of hospital-acquired infections arising from inadequate antimicrobial and antibiofilm performance in medical textiles is an increasingly urgent threat to public health. The dual strategy combining superhydrophobic surfaces with aPDT exhibits potent antibacterial efficacy and barely triggers the risk of antimicrobial resistance, but still encounters significant challenges, including intricate fabrication methods and narrow spectral absorption of single-photosensitizer (PS) systems. A superhydrophobic-photodynamic dual antimicrobial polyester fabric is developed herein for medical applications to address these challenges. A binary-PS system comprising curcumin (Cur) and methylene blue (MB) was loaded onto polyester fabrics via an integrated dyeing and finishing technology, while dodecyltrichlorosilane (DTCS)-modified silicon dioxide (abbreviated as DSiO₂) was spray-coated to construct a robust superhydrophobic surface. The binary-PS (Cur/MB) achieves broad spectral coverage (400-700 nm) and significantly enhances reactive oxygen species (ROS) generation under visible light irradiation via a Type II photodynamic mechanism. Benefiting from its strong antiadhesion and dual-photosensitizer enhanced photodynamic bactericidal properties, the superhydrophobic-photodynamic polyester fabrics exhibit 99.99% (4 log units) antibacterial efficiency under visible light irradiation (60,000 lx, 30 min). Remarkable biofilm inhibition of the fabric is also evidenced by the reduction of Staphylococcus aureus and Escherichia coli biofilm activity to 0.11 and 0.42, respectively. Moreover, the fabric displays excellent biocompatibility, maintaining the 85.51% viability of L929 cells after 24 h. Overall, this scalable and efficient fabrication strategy for superhydrophobic-photodynamic antibacterial textiles offers significant advantages in combating bacterial infections and suppressing biofilm formation.

Radiative cooling textiles are cooled by transferring the body's metabolic heat to outer space and reflecting sunlight, without any energy input, providing a sustainable way for personal thermal management (PTM). However, current research on the environmental adaptability of fabrics is very scarce, and most of the research on PTM has a single application environment. Here, based on the Mie scattering theory and the design of micronanostructures, this work demonstrates an environmentally adaptive fabric (EAF) composed of polyformaldehyde (POM) with a high selectivity ratio and hollow SiO₂. It not only achieves the selective emission of the atmospheric window (8-13 μm) but also shows the transmission of the entire band (2.5-25 μm) and reflect sunlight (0.3-2.5 μm). Remarkably, its optical properties remain outstanding after being subjected to acid, alkaline, and UV treatments, which match the daily garment use application requirements. As a result, the EAF achieves efficient radiative cooling both outdoors (under sunny and cloudy conditions) and indoors (1.5-12.2 °C lower than cotton and commercial cooling fabrics). The EAF with excellent environmental adaptability and robustness brings new possibilities for the rational design of next-generation smart thermal management textiles and other sustainable applications.

Flexible sodium-ion batteries (SIBs) have gained significant attention as a viable option for energy storage, offering enormous potential in wearable flexible electronic devices. CoFe₂O₄ is recognized as a highly attractive anode candidate for SIBs because of its abundant resource availability as well as its high theoretical capacity. Nonetheless, the volume expansion during sodium ions insertion and extraction often leads to structural degradation and decline in capacity. Moreover, its relatively low conductivity limits ion and electron transport, thus affecting its rate performance. This research introduces a novel flexible material composed of biomass-derived carbonized silk textile (CST) and ZIF-67-derived CoFe₂O₄ (ZCFO), synthesized through processes of calcination, acid treatment, and in situ growth. The resulting materials synergistically integrate the high surface area and structural stability of ZIF-67 with the flexibility and conductivity of CST, effectively addressing the capacity degradation induced by volume expansion of CoFe₂O₄ during cycling. Furthermore, it enhances ion and electron transport by shortening the diffusion path, thus improving the overall electrochemical performance. The resulting CST/ZCFO anode shows exceptional stability over extended cycling, maintaining a capacity of 255 mA h g^-1 after 2000 cycles at 2 A g^-1, and demonstrates excellent rate capability, delivering a discharge capacity of 110 mA h g^-1 at 4 A g^-1.