查看更多>>摘要：Anisotropy is a significant and prevalent characteristic of materials,conferring orientation-dependent properties,meaning that the creation of original symmetry enables key functionality that is not found in nature.Even with the advancements in atomic machining,synthesis of separated symmetry in different directions within a single structure remains an extraordinary challenge.Here,we successfully fabricate NiS ultrafine nanorods with separated symmetry along two directions.The atomic structure of the nanorod exhibits rotational symmetry in the radial direction,while its axial direction is characterized by divergent translational symmetry,surpassing the conventional crystalline structures known to date.It does not fit the traditional description of the space group and the point group in three dimensions,so we define it as a new structure in which translational symmetry and rotational symmetry are separated.Further corroborating the atomic symmetric separation in the electronic structure,we observed the combination of stripe and vortex magnetic domains in a single nanorod with different directions,in accordance with the atomic structure.The manipulation of nanostructure at the atomic level introduces a novel approach to regulate new properties finely,leading to the proposal of new nanotechnology mechanisms.
查看更多>>摘要：High-voltage aqueous zinc ion batteries(AZIBs)with a high-safety near-neutral electrolyte is of great significance for practical sustainable application;however,they suffer from anode and electrode/electrolyte interfacial incompatibility.Herein,a conversion-type anode chemistry with a low anodic potential,which is guided by the Gibbs free energy change of conversion reaction,was designed for high-voltage near-neutral AZIBs.A reversible conversion reaction between ZnC2O4·2H2O particles and three-dimensional Zn metal networks well-matched in CH3COOLi-based electrolyte was revealed.This mechanism can be universally validated in the battery systems with sodium or iodine ions.More importantly,a cathodic crowded micellar electrolyte with a water confinement effect was proposed in which lies the core for the stability and reversibility of the cathode under an operating platform voltage beyond 2.0 V,obtaining a capacity retention of 95％after 100 cycles.Remarkably,the scientific and technological challenges from the coin cell to Ah-scale battery,sluggish kinetics of the solid-solid electrode reaction,capacity excitation under high loading of active material,and preparation complexities associated with large-area quasi-solid electrolytes,were explored,successfully achieving an 88％capacity retention under high loading of more than 20 mg cm-2 and particularly a practical 1.1 Ah-level pouch cell.This work provides a path for designing low-cost,eco-friendly and high-voltage aqueous batteries.
查看更多>>摘要：Heterogeneous catalysis promises to accelerate sulfur-involved conversion reactions in lithium-sulfur batteries.Solid-state Li2S dissociation remains as the rate-limiting step because of the weakly matched solid-solid electrocatalysis interfaces.We propose an electrochemically molecular-imprinting strategy to have a metal sulfide(MS)catalyst with imprinted defects in positions from which the pre-implanted Li2S has been electrochemically removed.Such tailor-made defects enable the catalyst to bind exclusively to Li atoms in Li2S reactant and elongate the Li-S bond,thus decreasing the reaction energy barrier during charging.The imprinted Ni3S2 catalyst shows the best activity due to the highest defect concentration among the MS catalysts examined.The Li2S oxidation potential is substantially reduced to 2.34 V from 2.96 V for the counterpart free of imprinted vacancies,and an Ah-level pouch cell is realized with excellent cycling performance.With a lean electrolyte/sulfur ratio of 1.80 μL mgs-1,the cell achieves a benchmarkedly high energy density beyond 500 Wh kg-1.
查看更多>>摘要：Irreversible interfacial reactions at the anodes pose a significant challenge to the long-term stability and lifespan of zinc(Zn)metal batteries,impeding their practical application as energy storage devices.The plating and stripping behavior of Zn ions on polycrystalline surfaces is inherently influenced by the microscopic structure of Zn anodes,a comprehensive understanding of which is crucial but often overlooked.Herein,commercial Zn foils were remodeled through the incorporation of cerium(Ce)elements via the'pinning effect'during the electrodeposition process.By leveraging the electron-donating effect of Ce atoms segregated at grain boundaries(GBs),the electronic configuration of Zn is restructured to increase active sites for Zn nucleation.This facilitates continuous nucleation throughout the growth stage,leading to a high-rate instantaneous-progressive composite nucleation model that achieves a spatially uniform distribution of Zn nuclei and induces spontaneous grain refinement.Moreover,the incorporation of Ce elements elevates the site energy of GBs,mitigating detrimental parasitic reactions by enhancing the GB stability.Consequently,the remodeled ZnCe electrode exhibits highly reversible Zn plating/stripping with an accumulated capacity of up to 4.0 Ah cm-2 in a Zn symmetric cell over 4000 h without short-circuit behavior.Notably,a～0.4 Ah Zn||NH4V4O10 pouch cell runs over 110 cycles with 83％capacity retention with the high-areal-loading cathode(≈20 mg cm-2).This refining-grains strategy offers new insights into designing dendrite-free metal anodes in rechargeable batteries.
查看更多>>摘要：Conventional bone scaffolds,which are mainly ascribed to highly active osteoclasts and an inflammatory microenvironment with high levels of reactive oxygen species and pro-inflammatory factors,barely satisfy osteoporotic defect repair.Herein,multifunctional self-assembled supramolecular fiber hydrogels(Ce-Aln gel)consisting of alendronate(Aln)and cerium(Ce)ions were constructed for osteoporotic bone defect repair.Based on the reversible interaction and polyvalent cerium ions,the Ce-Aln gel,which was mainly composed of ionic coordination and hydrogen bonds,displayed good injectability and autocatalytic amplification of the antioxidant effect.In vitro studies showed that the Ce-Aln gel effectively maintained the biological function of osteoblasts by regulating redox homeostasis and improved the inflammatory microenvironment to enhance the inhibitory effect on osteoclasts.Ribonucleic acid(RNA)sequencing further revealed significant downregulation of various metabolic pathways,including apoptosis signaling,hypoxia metabolism and tumor necrosis factor-alpha(TNF-a)signaling via the nuclear factor kappa-B pathway after treatment with the Ce-Aln gel.In vivo experiments showed that the clinical drug-based Ce-Aln gel effectively promoted the tissue repair of osteoporotic bone defects by improving inflammation and inhibiting osteoclast formation at the defect.Notably,in vivo systemic osteoporosis was significantly ameliorated,highlighting the strong potential of clinical translation for precise therapy of bone defects.
查看更多>>摘要：Alzheimer's disease(AD)is a devastating neurodegenerative disease that affects～50 million people globally.The accumulation of amyloid-β(Aβ)plaques,a predominant pathological feature of AD,plays a crucial role in AD pathogenesis.In this respect,Aβ has been regarded as a highly promising therapeutic target for AD treatment.Polyoxometalates(POMs)are a novel class of metallodrugs being developed as modulators of Aβ aggregation,owing to their negative charge,polarity,and three-dimensional structure.Unlike traditional discrete inorganic complexes,POMs contain tens to hundreds of metal atoms,showcasing remarkable tunability and diversity in nuclearities,sizes,and shapes.The easily adjustable and structurally variable nature of POMs allows for their favorable interactions with Aβ.This mini-review presents a balanced overview of recent progress in using POMs to mitigate amyloidosis.Clear correlations between anti-amyloid activities and structural features of POMs are also elaborated in detail.Finally,we discuss the current challenges and future prospects of POMs in combating AD.
查看更多>>摘要：Prokaryotes are ubiquitous in the biosphere,important for human health and drive diverse biological and environmental processes.Systematics of prokaryotes,whose origins can be traced to the discovery of microorganisms in the 17th century,has transitioned from a phenotype-based classification to a more comprehensive polyphasic taxonomy and eventually to the current genome-based taxonomic approach.This transition aligns with a foundational shift from studies focused on phenotypic traits that have limited comparative value to those using genome sequences.In this context,Bergey's Manual of Systematics of Archaea and Bacteria(BMSAB)and Bergey's International Society for Microbial Systematics(BISMiS)play a pivotal role in guiding prokaryotic systematics.This review focuses on the historical development of prokaryotic systematics with a focus on the roles of BMSAB and BISMiS.We also explore significant contributions and achievements by microbiologists,highlight the latest progress in the field and anticipate challenges and opportunities within prokaryotic systematics.Additionally,we outline five focal points of BISMiS that are aimed at addressing these challenges.In conclusion,our collaborative effort seeks to enhance ongoing advancements in prokaryotic systematics,ensuring its continued relevance and innovative characters in the contemporary landscape of genomics and bioinformatics.
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