Reshaping Li–Mg hybrid batteries:Epitaxial electrodeposition and spatial confinement on MgMOF substrates via the lattice‐matching strategy

The emergence of Li–Mg hybrid batteries has been receiving attention,owing to their enhanced electrochemical kinetics and reduced overpotential.Nevertheless,the persistent challenge of uneven Mg electrodeposition remains a significant impediment to their practical integration.Herein,we developed an ingenious approach that centered around epitaxial electrocrystallization and meticulously controlled growth of magnesium crystals on a specialized MgMOF substrate.The chosen MgMOF substrate demonstrated a robust affinity for magnesium and showed minimal lattice misfit with Mg,establishing the crucial prerequisites for successful heteroepitaxial electrocrystallization.Moreover,the incorporation of periodic electric fields and successive nanochannels within the MgMOF structure created a spatially confined environment that considerably promoted uniform magnesium nucleation at the molecular scale.Taking inspiration from the“blockchain”concept prevalent in the realm of big data,we seamlessly integrated a conductive polypyrrole framework,acting as a connecting“chain,”to interlink the“blocks”comprising the MgMOF cavities.This innovative design significantly amplified charge‐transfer efficiency,thereby increasing overall electrochemical kinetics.The resulting architecture(MgMOF@PPy@CC)served as an exceptional host for heteroepitaxial Mg electrodeposition,showcasing remarkable electrostripping/plating kinetics and excellent cycling performance.Surprisingly,a symmetrical cell incorporating the MgMOF@PPy@CC electrode demonstrated impressive stability even under ultrahigh current density conditions(10mAcm^(–2)),maintaining operation for an extended 1200 h,surpassing previously reported benchmarks.Significantly,on coupling the MgMOF@PPy@CC anode with a Mo_(6)S_(8) cathode,the assembled battery showed an extended lifespan of 10,000 cycles at 70 C,with an outstanding capacity retention of 96.23%.This study provides a fresh perspective on the rational design of epitaxial electrocrystallization driven by metal–organic framework(MOF)substrates,paving the way toward the advancement of cuttingedge batteries.

Large scalable,ultrathin and self-cleaning cellulose aerogel film for daytime radiative cooling

Passive cooling strategy shows great potential in mitigating global warming and reducing energy consumption.Because of the high emissivity in the atmospheric transparency window(λ≈8–13μm),cellulose is considered as a good candidate for radiative cooling.However,traditional cellulose coolers generally show poor solar reflection and can be polluted by dust outside,thereby resulting in poor daytime cooling efficiency.To address these drawbacks,we developed sustainable cellulose nanowhiskers(CNWs)/ZnO composite aerogel films with favorable optical performance,mechanical robustness,and self-cleaning function for efficient daytime radiative cooling,which can be achieved via freeze casting and hot-pressing process.Due to formation of multi-level porous structure and chemical bonds(Si-O-C/Si-O-Si),such aerogel film exhibited high solar reflectance(97%)and high infrared emittance(92.5%).It achieved a sub-ambient temperature drop of 6.9℃under direct sunlight in hot weather.Most importantly,the surface roughness and low surface energy enable cellulose aerogel film hydrophobicity(contact angle=133°),thereby resulting in an anti-dust function.This work provides insight into the design of sustainable thermal regulating materials to realize carbon neutrality.

Functional biochar for efficient residue treatment of sulfonylurea herbicides by weak molecular interaction

Pesticide residues have seriously damaged the natural environment and social security.Here,we prepared the efficient functional biochar(FB)for sulfonylurea herbicides from cotton straw cellulose(CSC)by hydrothermal carbonization with the methacrylic acid.The molecular simulation of FB indicated thatπ-πelectron-donor-acceptor(EDA)interaction and formation of charge-assisted H-bond were both the main factors for effective adsorption process.The adsorption process can match the pseudo-second-order kinetic equation and Freundlich model.The whole process is physical adsorption,spontaneous and rapid,and can quickly reach equilibrium.The FB with carbon-oxygen functional groups and aromatic conjugated structures can remove pesticides in water very quickly(within 30 s),with effective adsorption over 95%of Sulfonylurea herbicides(SUHs).Therefore,functional FB might be an effective way to get excellent absorbent for pesticide treatment.