Tianxu Ji,Zinan Wang,Peng Wang,Xiaoyu Yang,Jihao Ye,Xuze Tang,Chunyan Li,Yunpeng Liu
Aqueous zinc-ion batteries (AZIBs) are considered promising candidates for advanced energy storage systems due to their operational reliability and economic viability. However, practical application is hindered by challenges such as Zn dendrite growth, hydrogen evolution (HER) and corrosion reactions. In this study, an in situ growth strategy is introduced to fabricate a superhydrophobic ZIF-71 coating (ZIF-71(IS)@Zn) directly on the Zn anode surface. This method enhances interfacial adhesion and coating uniformity in comparison to conventional spray-coated techniques (ZIF-71(Sp)@Zn). The ZIF-71(IS) coating possesses intrinsic hydrophobicity due to –Cl groups and a dense structure, effectively preventing water molecule penetration and mitigating HER and corrosion. Density functional theory (DFT) calculations indicate that ZIF-71 promotes Zn2+ desolvation by reducing hydration energy and improves Zn2+ adsorption on the (002) crystal plane. Electrochemical evaluations reveal that ZIF-71(IS)@Zn exhibits an extended cycling lifespan of 3000 h at 1 mA cm−2/0.5 mA h cm−2, surpassing the performance of ZIF-71(Sp)@Zn (1232 h) and bare Zn (531 h). Full cells paired with AlVO-NMP cathodes achieve an initial capacity of 335.1 mA h g−1 at 5 A g−1, maintaining 81.1% of capacity after 3000 cycles. Pouch cells retain 86.8% capacity after 2000 cycles at 2 A g−1, demonstrating the feasibility of this strategy for stabilizing Zn anodes.
Junyi Shi,Hongjuan Wang,Peng Liu,Dehai Yu,Dandan Ji
PLA-based composite aerogels with high oil selectivity, good reusability, and gravity-driven transport capability are promising materials for oily-water treatment and spill remediation. However, many high-performance oil/water separation aerogels still rely on non-degradable matrices or fluorinated surface modifiers. Herein, ZIF-71 nanoparticles were incorporated into a polylactic acid (PLA) aerogel to construct a hydrophobic capillary-gating network through solution blending, water-assisted thermally induced phase separation, liquid-nitrogen freezing, and freeze-drying. The chlorinated imidazolate framework contributed hydrophobic/oleophilic domains, polyhedral roughness, and textural porosity, while the PLA matrix provided a lightweight biodegradable skeleton. Compared with pristine PLA, the optimized PZ71–3 aerogel increased the water contact angle from 114° to 136°, tensile strength from 0.088 to 0.166 MPa, elongation at break from 10% to 25%, and total pore volume from 0.0066 to 0.0091 cm³ g⁻¹ , while showing a BJH average pore diameter of 10.8 nm. The aerogel resisted a water head of 14.5 cm, selectively captured both floating heptane and sinking CCl₄, achieved oil recovery efficiencies of 98.2–99.2% with gravity-driven oil fluxes of 5300–17,200 L m⁻² h⁻¹ , and retained stable oil sorption capacity and flux over 20 cycles. Comparative benchmarking shows that PZ71–3 offers a balanced performance profile among MOF/polymer and biodegradable-polymer aerogels. This work demonstrates ZIF-71-induced hydrophobic capillary gating as an effective fluorine-free strategy for recyclable PLA-based sorbents for oil/water separation.
Metal–organic frameworks (MOFs) have emerged as promising iodine adsorbents for nuclear safety, yet the poor processability and recyclability of MOF powders severely limit their practical applications. Immobilizing MOFs onto green porous substrates offers an effective strategy to address these challenges while preserving their intrinsic porous structure and adsorption performance. This work employed biodegradable polylactide (PLA) aerogels with a vertically oriented pore structure (fabricated by directional freeze-drying technique) as the supports for the in situ growth and immobilization of ZIF-71 particles, successfully fabricating green ZIF-71@PLA composite aerogels. The ZIF-71 loadings on PLA aerogels could be effectively tailored by regulating the in situ growth time. The results revealed that the ZIF-71@PLA composite aerogels could well preserve the vertically oriented pore structures, therefore imparting excellent mechanical strength (up to 464.42 kPa) and outstanding iodine adsorption performance (maximum adsorption capacity of 320.02 mg/g at 50 °C) to ZIF-71@PLA aerogels. Additionally, the aerogels exhibited remarkable iodine adsorption stability and superior adsorption selectivity toward iodine, and the underlying adsorption mechanism was systematically investigated. This study provided a sustainable and green strategy for developing efficient, eco-friendly iodine adsorbent materials for nuclear safety applications.
危险品化学品经营许可证（带存储）