ABSTRACT The electrochemical performance of vanadium‐based oxide cathodes in aqueous zinc‐ion batteries has long been constrained by their intrinsically low electronic conductivity, severe vanadium dissolution, and prolonged synthesis procedures. To address these limitations, a supercritical solvothermal strategy is developed for the rapid fabrication of a high‐performance spinel‐structured ZnV 2 O 4 /porous carbon (ZnV 2 O 4 /PRC) composite. Benefiting from the excellent mass transfer and heat transfer characteristics and mild reducing capability of supercritical ethanol, this approach effectively suppresses the formation of hydrated zinc vanadate phases, thereby significantly shortening the reaction time required for ZnV 2 O 4 formation. Meanwhile, the introduction of a porous carbon (PRC) framework provides efficient electrolyte penetration pathways, reduces the interparticle diffusion resistance of Zn 2+ ions, and minimizes the direct contact between ZnV 2 O 4 and the electrolyte. As a result, the electronic conductivity of the composite is substantially enhanced, Zn 2+ transport kinetics are accelerated, and vanadium dissolution is significantly mitigated. Owing to these combined advantages, the ZnV 2 O 4 /PRC cathode delivers a high reversible capacity of 470 mAh g −1 at 0.1 A g −1 and retains 172 mAh g −1 after 5000 cycles at a high current density of 10 A g −1 , demonstrating outstanding long‐term cycling stability.
ABSTRACT FCC (face‐centered cubic) structures are found to be highly prevalent in both bulk Au and Au nanoclusters, but achieving precise tailoring or the formation of new stacking modes based on FCC structure has proved challenging. Here, we show a radical‐induced structure transformation strategy using persulfates that results in the formation of three new nanoclusters: Au 41 (SR) 25 , Au 46 (SR) 26 , and Au 49 (SR) 27 (SR: thiolate). The double helices of Au 4 assemblies in their kernel structures are observed to adopt branch and cross‐linked growth beyond that of linear growth in the previous FCC‐kernelled structure. The superoxide radicals converted from persulfates are revealed to oxidize the Au 44 precursors with a concurrent Au‒S cleavage, leading to the formation of thermodynamically stable nanoclusters, which are confirmed by theoretical calculations and experimental results. This study unveils new perspectives on the reactivity of atomically precise NCs and highlights a radical‐based strategy to design more kernel packing structures.
ABSTRACT Semiconductor core/shell nanorods (NRs) exhibit highly diameter‐dependent optical properties. However, post‐synthetic strategies for broad and controllable diameter modulation remain limited. Here, we present an amine‐mediated approach that enables wide‐range diameter modulation of CdSe/CdS NRs through two distinct, temperature‐dependent pathways: intraparticle ripening and etching. These opposing processes allow continuous expansion or reduction of NR diameter, leading to systematic red‐ and blue‐shifts in photoluminescence along with corresponding changes in band alignment and exciton dynamics. Notably, diameter reduction via etching induces a pronounced enhancement of fluorescence anisotropy. Continued etching beyond shell thinning leads to anisotropic reshaping of the CdSe core into a more elongated geometry, which enhances light‐hole–heavy‐hole subband splitting and results in strongly linearly polarized emission. These results suggest that, although smaller cores are typically associated with reduced fluorescence anisotropy, diameter reduction coupled with anisotropic core reshaping provides a viable strategy to enhance anisotropy. At the ensemble level, this enhancement leads to high polarization contrast after macroscopic alignment. This work establishes amine‐mediated diameter engineering as a versatile post‐synthetic approach for simultaneously tuning excitonic structure and fluorescence anisotropy of semiconductor NRs, providing a practical design guideline for polarized light‐emitting and optoelectronic applications.
Abstract For decades, molecular ferroelectrics have been regarded as promising alternatives to inorganic ferroelectrics, owing to their lightweight, flexibility, heavy‐metal‐free composition, and low cost. However, most reported organic compounds met the problem of low Curie point ( T c ). Here, we report a novel ferroelectric donor–acceptor (D–A) cocrystal, namely 7 H ‐benzo[ c ]carbazole–1,2,4,5‐tetracyanobenzene (BCZ–TCNB), which shows significiant polarization at room temperature and its polar structure can be maintained up to a high melting point of 502 K. Owing to the displacive ···D + A − ···D + A − ···D + A − ··· packing along a ‐axis and asymmetric orientation along c ‐axis, bi‐directional polarization behavior is observed in the symmetry breaking binary system. The thermodynamically and dynamically stable polar structure enables a high‐temperature melting state, benefiting from strong charge–transfer interaction and other intermolecular interactions. Considering its good piezoelectric coefficient, organic field‐effect transistors (OFETs) covered with BCZ–TCNB thin‐film exhibits good capability for real‐time monitoring of various signals and expressing spatial information.
ABSTRACT The rapid increase in electronic waste (e‐waste) and the growing demand for rare metals underline the urgent need for effective technologies to recover valuable elements such as gold from waste, a process known as urban mining. However, the development of sustainable and cost‐effective adsorbents with high capacity and selectivity remains challenging. Here, two novel bioinspired bismuth metal–organic frameworks using the edible polyphenolic ellagic and gallic acids as building blocks, namely, bismuth‐ellagate (Bi‐EA) and bismuth‐gallate (Bi‐GA), are synthesized to evaluate for gold extraction from various matrices, including river water, seawater, and leaching solutions from computer central processing units (CPUs). Both chemically stable bismuth‐based metal–organic frameworks (bioMOFs) exhibit an ultrahigh adsorption capacity (2989.9 mg/g for Bi‐EA and 2516.3 mg/g for Bi‐GA), with high Au 3+ removal efficiency (> 99%) within 10 min, high selectivity, and recyclability. The excellent gold recovery performance is attributed to the adsorption‐reduction mechanism resulting from the phenolic hydroxyl groups in these frameworks. This work provides a sustainable and cost‐effective method for gold recovery with superior efficiency and environmental compatibility compared to existing technologies, thus contributing to the sustainable management of gold resources.
