Bei Wang

Halogen‐based aqueous dual‐ion batteries (ADIBs) are highly attractive owing to their environmental benignity and promising electrochemical performance. However, the high reactivity of halogen anions leads to severe side reactions during halogen storage in conventional carbon‐based positive electrodes, which hinders the development of practical high‐performance ADIBs. Herein, fluorinated graphite (CF _x ) is conceptually redefined as an efficient halogen anion storage material, departing from its traditional role as a cation intercalation host in alkali‐metal batteries. Combined density functional theory calculations and in situ Raman spectroscopy verify the intercalation of [BrF] and [ClF] interhalogen species into CF _x interlayers. The optimized structure of [C ₄ F ₂ BrCl] affords a theoretical specific capacity of 623 mAh gˉ ¹ for CF _0.5 . Compared with pristine graphite, this unique electrode mechanism effectively suppresses the formation of free Br ₂ /Cl ₂ , while the expanded interlayer spacing of CF _x facilitates the intercalation of halogen anions. Accordingly, the CF _x positive electrode exhibits superior rate capability and cycling stability. The practical feasibility is further demonstrated in a soft‐packaged Zn/CF _0.56 pouch cell. This work not only conceptually redefines CF _x from a conventional cation host to a high‐efficiency halogen anion storage material, shedding lights on deep science in ADIBs, but also lays a solid foundation to rationally design of advanced electrode materials.

Nanoplastics are a significant environmental threat due to their persistence and toxicity. In this study, we prepared a kind of Ag‐doped Co ₃ O ₄ catalyst using a coprecipitation method, aimed at enhancing its photocatalytic degradation efficiency of polystyrene nanoplastics under UV irradiation. Morphology and component of Ag/Co ₃ O ₄ have been investigated by XRD, FTIR, TEM, and BET analysis. The information of absorption and energy levels for catalysts is provided by UV–vis DRS, Tauc plots, and Mott–Schottky curves. Charge‐transfer abilities for catalysts have been analyzed by PL spectra and EIS. The photocatalytic activities of Ag nanoparticles (Ag NPs), Co ₃ O ₄ , and Ag/Co ₃ O ₄ have been carefully evaluated in this work. Ag/Co ₃ O ₄ photocatalyst exhibits the highest degradation efficiency with a kinetic rate constant of 0.0086 min ^{− 1} , outperforming that of Co ₃ O ₄ (0.0062 min ^{− 1} ) and Ag NPs (0.0036 min ^{− 1} ). The degradation efficiencies for catalysts have also been assessed under varying pH conditions (neutral, acidic, and basic). Among them, Ag/Co ₃ O ₄ shows a notable degradation efficiency of 61% at pH 7, compared to 46% for Co ₃ O ₄ and 30% for Ag NPs. In addition, the intermediates and final products have also been discussed according to Py‐GC/MS results.

In this work, a new kind of biomass carbon quantum dots (CQDs) from Ulva prolifera was synthesized by the hydrothermal method. A series of CQDs modified graphitic carbon nitride (CQDs/g‐C ₃ N ₄ ) photocatalysts were prepared by thermal polymerization. The hydrogen evolution rate increases from 310.2 to 1173.2 µmol g ⁻¹ h ⁻¹ by CQDs loading. Through dosage optimization, the highest rate of 4‐CQDs/g‐C ₃ N ₄ reaches 2302.1 µmol g ⁻¹ h ⁻¹ under visible light. CQDs loading increases the specific surface area of g‐C ₃ N ₄ , which provides more active sites for photocatalysis. Furthermore, electrochemical and photophysical studies substantiate that introducing CQDs to g‐C ₃ N ₄ can accelerate charge transfer process and inhibit the recombination of free charges. Notably, 4‐CQDs/g‐C ₃ N ₄ photocatalyst shows good operation stability in cycle tests.

The hydrogen evolution performance of graphitic carbon nitride under visible light is much improved by cooperating 3,9-perylenedicarboxylic acid to tune its electronic structure.