Ferromagnetism is usually deemed incompatible with superconductivity. Consequently, the coexistence of superconductivity and ferromagnetism is usually observed only in elegantly designed multi-ingredient structures in which the two competing electronic states originate from separate structural components. Here we report the use of surface molecular adsorption to induce ferromagnetism in two-dimensional superconducting NbSe2, representing the freestanding case of the coexistence of superconductivity and ferromagnetism in one two-dimensional nanomaterial. Surface-structural modulation of the ultrathin superconducting NbSe2 by polar reductive hydrazine molecules triggers a slight elongation of the covalent Nb–Se bond, which weakens the covalent interaction and enhances the ionicity of the tetravalent Nb with unpaired electrons, yielding ferromagnetic ordering. The induced ferromagnetic momentum couples with conduction electrons generating unique correlated effects of intrinsic negative magnetoresistance and the Kondo effect. We anticipate that the surface molecular adsorption will be a powerful tool to regulate spin ordering in the two-dimensional paradigm.

The monosialodihexosylganglioside, GM3, and its binding to CD169 (Siglec‐1) have been indicated as key factors in the glycoprotein‐independent sequestration of the human immunodeficiency virus‐1 (HIV‐1) in virus‐containing compartments (VCCs) in myeloid cells. Here, lipid‐wrapped polymer nanoparticles (NPs) are applied as a virus‐mimicking model to characterize the effect of core stiffness on NP uptake and intracellular fate triggered by GM3‐CD169 binding in macrophages. GM3‐functionalized lipid‐wrapped NPs are assembled with poly(lactic‐co‐glycolic) acid (PLGA) as well as with low and high molecular weight polylactic acid (PLAlMW and PLAhMW) cores. The NPs have an average diameter of 146 ± 17 nm and comparable surface properties defined by the self‐assembled lipid layer. Due to differences in the glass transition temperature, the Young's modulus (E) differs substantially under physiological conditions between PLGA (EPLGA = 60 ± 32 MPa), PLAlMW (EPLAlMW = 86 ± 25 MPa), and PLAhMW (EPLAhMW = 1.41 ± 0.67 GPa) NPs. Only the stiff GM3‐presenting PLAhMW NPs but not the softer PLGA or PLAlMW NPs avoid a lysosomal pathway and localize in tetraspanin (CD9)‐positive compartments that resemble VCCs. These observations suggest that GM3‐CD169‐induced sequestration of NPs in nonlysosomal compartments is not entirely determined by ligand–receptor interactions but also depends on core stiffness.

An increasing world population requires new renewable energy technologies and efficient strategies to minimize environmental pollution. This work introduces plasmonic nanoreactors that can convert the ubiquitous waste molecule urea into electrical energy through absorption of light. Our work utilizes the electromagnetic enhancement of silver nanoparticles to enhance the efficacy of a molecular photocatalyst in a hierarchical nanopigment architecture to enable light-driven urea oxidation and direct urea fuel cells. We demonstrate substantial plasmonic enhancement on both the photoexcitation and photoreactivity.

The direct urea fuel cell (DUFC) is an important but challenging renewable energy production technology,i to ffers great promise for energy-sustainable developments and mitigating water contamination. However,DUFCs still suffer from the sluggish kinetics of the urea oxidation reaction (UOR) owingtoa6e À transfer process,which poses asevere hindrance to their practical use.Herein, taking b-Ni(OH) 2 nanosheets as the proof-of-concept study,wedemonstrated asurface-chemistry strategy to achieve metallic Ni(OH) 2 nanosheets by engineering their electronic structure,r epresenting af irst metallic configuration of transition-metal hydroxides.S urface sulfur incorporation successfully brings synergetic effects of more exposed active sites,good wetting behavior,and effective electron transport, giving rise to greatly enhanced performance for UOR. Metallic nanosheets exhibited amuchhigher current density,smaller onset potential and stronger durability.Driven by growing concerns about global warming and the depletion of fossil fuel, developing renewable energy-production and -storage technologies represent an important but challenging issue. [1][2][3] In this regard, direct urea fuel cells offer great promise for energy-sustainable developments and also mitigating water contamination. [4][5][6] Theu rea fuel cell is designed based on 2CO(NH 2 ) 2 + 3O 2 !2N 2 + 4H 2 O + 2CO 2 , accomplishing power output and concurrently remedying urea-rich wastewater before urea naturally hydrolyzes in the environment. Compared to cathodic oxygen reduction reaction (ORR), the anodic urea oxidation reaction (denoted as UOR, CO(NH 2 ) 2 + 6OH À !N 2 + 5H 2 O + CO 2 + 6e À )undergoes more sluggish kinetics owing to a6e À transfer process and requires the use of electrocatalysts for promoting the reaction rate.T herefore,h igh-performance UOR catalysts are required to reduce the overpotential to drive the sluggish reaction. Although tremendous efforts have been devoted to pursue efficient electrocatalysts to give superior UOR performance, [7][8][9][10][11][12][13][14][15] they still suffer from inferior electrical conductivity and "poisoning", greatly hindering electrochemical efficiency for practical application.Conductive two-dimensional (2D) nanosheets have been explored for high-performance electrocatalysts because of their highly exposed catalytic surface and excellent electron transportation. Tw o-dimensional nanomaterials usually possess exposed surfaces with low-coordinated steps,e dges,a nd kinks,w hich provide abundant active sites to mediate the electrocatalytic process,allowing them to be efficient electrocatalysts. [16] Owing to the dimensionally reduced structure of 2D nanomaterials,i nw hich most of atoms are exposed on surface and thus offer high chemical activity,v arious strategies directed at the surface atoms,including defect engineering, surface incorporation and structural distortion, [17][18][19] have been employed to effectively augment the number of active sites.Moreover,intrinsic high conductivity is also essential fo...