查找使用阿拉丁产品的科研文献

Construction of Co9S8-ReS2Ni3S2/NF catalyst and its electrocatalytic water splitting performance

Xueying Lu,Xu Han,Dan Zhao,Tianhao Wang,Yinan Liu,Jing Hu,Yitao He

Hydrogen energy, featuring high energy density and environmental friendliness, is a highly promising renewable clean energy carrier. Electrolytic water splitting for hydrogen production is effective for high-purity H 2 , with efficient and stable electrocatalysts being the key to efficiency optimization. Rhenium-based catalysts attract attention due to their unique electronic structure, high activity, and broad pH adaptability, but enhancing their hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance remains a challenge. This study reports a two-step hydrothermal method to in situ grow Co 9 S 8 -ReS 2 Ni 3 S 2 on nickel foam. Co incorporation induces “coral-like” nanostructures, increasing active surface area and suppressing agglomeration, while strong ReS 2 Co 9 S 8 interfacial coupling optimizes charge redistribution. The catalyst exhibits overpotentials of 89 mV (HER) and 268 mV (OER) at 10 mA cm -2 , achieves 10 mA cm -2 at 1.61 V for overall water splitting, and maintains stability for 100 h, providing new insights for high-performance electrocatalysts.

Design a new type of composite coating of functionalized hydroxyapatite platelets-composite benzotriazole/epoxy resin with excellent anti-corrosion performance

Changyong Zhao,Hualiang Huang,Xiaotao Zheng

Metal corrosion poses a significant challenge to the sustainable development of industrial society, leading to substantial economic losses and safety risks. Epoxy coatings are widely used for corrosion protection, but their performance is limited by inherent defects, such as micropores and poor long-term durability. In this study, mesoporous hydroxyapatite platelets (mHAp) were synthesized via a hydrothermal method and sequentially modified with an aminosilane coupling agent (3-Aminopropyltrimethoxysilane (KH540)) and the corrosion inhibitor (benzotriazole (BTA)) to develop a functional nanofiller (KH540-mHAp@BTA). The successful synthesis and modification were confirmed by TEM, BET, FT-IR, XRD, XPS, SEM, and TGA. The modified nanofiller was incorporated into an epoxy resin (EP) to fabricate a new type of composite coating. Electrochemical impedance spectroscopy (EIS) and scratch tests showed that the KH540-mHAp@BTA/EP coating exhibited superior corrosion resistance, maintaining a high low-frequency impedance modulus (>10 8  Ω·cm 2 ) after 30 days of immersion in a 3.5 wt% NaCl solution. The coating also showed excellent dispersion, interfacial compatibility, and active protection capability due to the sustained release of BTA. This work highlights the potential of functionalized hydroxyapatite platelets as an efficient nanofiller for advanced anti-corrosion coatings.

Fabrication of low-fat mayonnaise via egg white protein fibril-stabilized emulsion gels: Enhanced interfacial adsorption and network support

Wanyi Dong,Mohamed Salama,Kazuhiro Isobe,Akihiro Handa,Xi Huang,Zhaoxia Cai

Preparation of a cucurbit[6]uril-containing monolithic material for specific recognition and enrichment of multi-phosphopeptides

Ruizhi Tang,Shujuan Ma,Quan Bai,Yangyang Bian,Zichao Tang,Junjie Ou

Supramolecular affinity chromatography based on host-guest interactions represents a promising approach for achieving highly specific separation and purification of biomacromolecules. Among the various macrocyclic molecules, cucurbit[n]urils (CB[n]) have attracted significant attention in recent years due to their unique molecular recognition capabilities. Notably, recent studies have revealed the specific binding of CB[n] to aromatic amino acids and short peptides with aromatic residues or N-terminal motif. In this work, we report the specific recognition of protein phosphorylation sites by cucurbit[6]uril (CB[6]), and propose a CB[6]-based supramolecular affinity chromatography (CSAC) strategy for the enrichment of multi-phosphopeptides. A polymeric monolith was prepared by polymerization of perallyloxyl CB[6] and ethylene dimethacrylate. In order to study the recognition mechanism of CB[6] on phosphate groups, the chromatographic conditions of CSAC, including loading, washing and elution, were separately evaluated utilizing the CB[6] monolithic material as a platform. Molecular recognition of phosphorylation sites was achieved in the solution of high organic solvent content (90% ACN), which was rarely reported. The established method exhibited specific recognition on multi-phosphopeptides and was employed for enrichment of multi-phosphopeptides, which showed good specificity (1:1000 of β-casein: BSA). Furthermore, CSAC can effectively isolate multi-phosphopeptides from mouse liver and improve the coverage of phosphopeptides. The recognition of phosphate groups by CB[6] is observed in a high-organic solvent environment, which is distinctly different from the recognition effect previously reported in aqueous phases. The established CSAC strategy holds promise as an effective technique for biological separations.

Construction of an S-scheme ZnMn2O4/CdO heterojunction for enhanced photocatalytic hydrogen evolution

Guangling Zuo,Hongyong Ye,Xingda Zhang,Rong Wang,Jia Du,Xin Ding

Photocatalytic hydrogen evolution represents a promising strategy for sustainable energy conversion, yet its efficiency is often limited by the rapid recombination of photogenerated carriers and insufficient redox capabilities. In this work, an S-scheme ZnMn 2 O 4 /CdO (ZMO/CdO) heterojunction was successfully fabricated via a simple solvothermal method to address these challenges. Based on band structure analysis, the composite satisfies the thermodynamic prerequisites for photocatalytic hydrogen evolution. The establishment of an S-scheme charge transfer pathway, driven by the combined effect of an internal electric field (IEF) and band bending, enables photogenerated electrons (e − ) to accumulate in the conduction band (CB) of ZnMn 2 O 4 (ZMO), while holes (h + ) are retained in the valence band (VB) of CdO. This mechanism not only promotes the spatial separation of photogenerated electron–hole pairs (PEHP) but also preserves the strongest redox ability of the system. Under optimized conditions (pH = 8 with triethanolamine (TEOA)), the ZMO/CdO composite achieves an outstanding hydrogen evolution rate of 2237 μmol∙g −1 ∙h −1 , which is approximately 4.38 and 2.84 times higher than that of pure CdO and ZMO, respectively. Moreover, the photocatalyst maintains high hydrogen production activity and structural stability in diverse real water samples, including municipal water, natural surface water, and even wastewater, highlighting its strong potential for practical solar-driven hydrogen production in complex environments.

Decoupling fast reduction from selective oxidation via bidirectional charge steering in MXene-UPDI/ZnIn2S4 dual-Schottky junctions

Wengang An,Yuhua Niu,Xiangyu Yan,Chuchu Deng,Changhong Zheng,Benzheng Li,Xiaoxin Yang,Nan Li,Yuesuo Yang,Wei Fan

Nanoscale control of charge-flow pathways can enable multifunctional photocatalysis by decoupling fast reduction from selective oxidation. Here, we report an MXene-bridged urea-modified perylene diimide polymer (UPDI)/ZnIn 2 S 4 ternary photocatalyst, denoted as UPMZ-50 (UPDI/MXene/ZnIn 2 S 4 containing 50 wt% ZnIn 2 S 4 ) that realizes a bidirectional dual-Schottky charge-transfer topology. Structural and electronic characterizations reveal that metallic MXene forms back-to-back Schottky junctions with both UPDI and ZnIn 2 S 4 . This configuration generates two oppositely oriented interfacial electric fields at the semiconductor/MXene contacts, which direct photogenerated electrons from both semiconductors onto the MXene nanosheets. Consequently, this architecture separates electron-rich reduction domains on MXene from hole-rich oxidation regions on the semiconductors. This dual-Schottky architecture suppresses charge recombination and enables stable multifunctional photocatalysis. Under optimized conditions, UPMZ-50 delivers efficient H 2 O 2 production (987 μmol·g −1 ·h −1 , 76.3% selectivity) and 92.4% tetracycline (TC) removal, while also exhibiting an H 2 evolution rate of 10.0 mmol g −1 ·h −1 as a benchmark for reduction performance. Mechanistic investigations identify superoxide (·O 2 − ) as the dominant reactive oxygen species (ROS) and a key intermediate for H 2 O 2 synthesis. The in situ generated H 2 O 2 is subsequently activated to yield ·OH, and together, these ROS promote TC degradation. These findings highlight MXene-based dual-Schottky heterojunctions as a versatile strategy for tuning charge-flow regulation. This work offers a transferable blueprint for decoupling high-rate reduction from ROS-driven selective oxidation, thereby bridging the gap between efficient solar-fuel production and environmental decontamination.

A recyclable carbon nanofiber/V2O5/g-C3N4 with electron-storage capacity for round-the-clock photocatalytic degradation of tetracycline

Wenli Zhang,Yi Yang,Xu Han,Xianhong Zheng,Haiwei Yang,Mingfei Sheng,Yi Zhang,Yiran Rong,Zongqian Wang,Peng Wang

The intermittent nature of solar irradiation limits the continuous application of semiconductor photocatalysis. Herein, a recyclable carbon nanofiber/V 2 O 5 /g-C 3 N 4 composite membrane is designed and fabricated through electrospinning and controlled carbonization, integrating photocatalytic function with electron-storage capability. The composite achieves 94.7% tetracycline degradation under light and retains 83.5% efficiency in the dark, surpassing the performance of its powder counterpart. The enhanced activity is attributed to promoted charge separation and the reversible V 5+ /V 4+ redox activity for electron storage. The composite exhibits excellent reusability and structural stability, maintaining high activity over five consecutive cycles without noticeable structural change, outperforming conventional powder catalysts in cycling durability. Mass spectrometry reveals distinct degradation pathways under light and dark conditions. This work provides a stable and easily retrievable membrane material for sustainable, continuous water purification.

Fabrication of Mo0.1-Cu0.4Ni0.6Co2O4 catalyst based on dual-doping engineering for fast hydrogen release from ammonia borane methanolysis

Chuanying Xiao,Xinyao Guo,Xiaotian Tang,Xin Meng,Bingxiang Cui,Lingli Fang,Jiajia Li,Yuanrui Wu,Lin Li,Hao Li,Junmin Nan

Constructing highly active, low-cost catalysts remains a key challenge for the mild, isothermal hydrogen-release pathway of ammonia-borane (AB) methanolysis. In this study, a systematic screen covering monodoping on NiCo 2 O 4 (Cu, W, Br, and Mo) and secondary co-doping on Cu 0.4 Ni 0.6 Co 2 O 4 (with W, Br, and Mo) identifies Mo 0.1 -Cu 0.4 Ni 0.6 Co 2 O 4 as the optimum composition. The Cu/Mo co-doped catalyst achieves a turnover frequency (TOF) of 43.08 mol H 2 mol −1 ·min −1 (approximately 78 times that of pristine NiCo 2 O 4 ) and maintains robust hydrogen-evolution performance over 10 cycles. Based on the experimental results, it is revealed that binary doping regulates the surface electronic states of the Mo 0.1 -Cu 0.4 Ni 0.6 Co 2 O 4 catalysts. Upon introducing Mo into Cu 0.4 Ni 0.6 Co 2 O 4 , electrons shift from Ni to Cu/Co, rendering Ni relatively electron-deficient and Cu/Co electron-enriched. The resulting charge redistribution lowers the activation barriers, accelerates the reaction kinetics, and promotes the methanolysis of AB. In summary, this work establishes dual-doping engineering for modulating charge redistribution as an effective strategy to develop efficient, noble-metal-free, and scalable catalysts towards AB methanolysis for fast hydrogen production.

Research on urea-ammonium chloride cocrystal nitrogen fertilizer and the solubility based on terahertz and multi-technology joint characterization

Xinyi Bai,Mingyu Wang,Haofei Sun,Bo Su,Zhaoxin Geng,Kai Li,Hailin Cui,Shengbo Zhang,Cunlin Zhang

Urea is a nitrogenous fertilizer characterized by high water solubility, yet it suffers from a relatively low nitrogen utilization efficiency. It not only pollutes the environment but also reduces agricultural productivity. Developing the physicochemical properties of nitrogen fertilizers is the key to improve the nitrogen utilization efficiency. In the present investigation, a novel 1:1 urea-ammonium chloride co-crystal system was synthesized through solvent evaporation methodology. This co-crystallization approach aimed at optimizing the physicochemical characteristics of urea. The formation of cocrystal was confirmed by a variety of characterization techniques, including PXRD, and DSC, TGA, SEM, Raman spectroscopy, and the crystal structure and purity were verified. The spectral properties of the material were measured using the THz-TDS system, which can effectively characterize the formation of cocrystal. The crystal structures and theoretical THz spectra of urea, ammonium chloride and the corresponding cocrystal were simulated by using density functional theory calculations. The solubility of the synthesized cocrystal was evaluated under greenhouse conditions, and the cocrystal's urea solubility was 36.15 g/100 mL, a ~ 66% reduction from pure urea's 100–120 g/100 mL. This work provides valuable methodological insights for agricultural cocrystal development and highlights the potential of cocrystal urea as a slow-release nitrogen fertilizer.

New insights into the charge transfer-enhanced SERS effects in ACo2O4 (A = Ni, Zn) bimetallic oxides: Crystal facet engineering

Yang Chen,Ning Ma,Xiaolian Liu,Zihao Liu,Shengyu Ling,Can Li,Yinyan Gong,Lengyuan Niu

The development of semiconductor-based surface-enhanced Raman scattering (SERS) substrates is often hindered by their limited sensitivity. Crystal facet engineering has been recognized as an effective strategy to improve the SERS performance of semiconductors. However, the underlying mechanism by which different exposed facets influence SERS activity in bimetallic oxide systems remains unexplored. In this study, we successfully synthesized NiCo 2 O 4 and ZnCo 2 O 4 bimetallic oxides with distinct exposed facets by regulating the alkali source. When evaluated using 4-Nitrothiophenol (4-NBT) as a probe molecule, the {110} facet demonstrated the highest SERS activity in both oxide systems. The enhancement factors (EF) reached 5.56 × 10 4 for NiCo 2 O 4 and 7.41 × 10 4 for ZnCo 2 O 4 . The limit of detection (LOD) was as low as 10 −7 M and 10 −8 M, respectively, as well as the excellent repeatability and stability. Energy level structure reveals that the superior SERS properties on the {110} facet can attributed to their higher VB maxima, which enhances the thermodynamic driving force and kinetic efficiency of the interfacial charge transfer (CT) process. Moreover, first-principles calculations further illustrate that the CT efficiency on the {110} facet can be effectively improved. This work provides a clear new direction for designing high-performance semiconductor SERS substrates through precise facet control.

Development of levulinic Acid/L-Proline DES-functionalized Fe3O4 nanoparticles for high-performance extraction of flavonoids from Scutellaria Radix

Guohua Teng,Min Zhou,Initizar Anwar,Yang Liu,Fuyi Li,Yanxu Chang,Yidan Wang,Yuefei Wang,Fei Tian

Flavonoids in Scutellaria Radix ( SR ) exhibit significant pharmacological activities, yet conventional extraction methods often suffer from low efficiency and poor selectivity. Here, a green and effective strategy was developed using deep eutectic solvent (DES)-functionalized magnetic nanoparticles for selective flavonoid enrichment. Forty-eight DESs were screened, and levulinic acid/L-proline (2:1) was identified as the optimal system. The selected DES was employed to synthesize Fe 3 O 4 @SiO 2 @DES, which demonstrated high specificity and adsorption performance in magnetic solid-phase extraction. Under optimized conditions, adsorption efficiencies for four representative flavonoids ranged from 0.770 ± 0.01 to 0.983 ± 0.002, with desorption recoveries of 0.551 ± 0.003 to 0.919 ± 0.019. The method showed excellent linearity (R 2  ≥ 0.9998) and low limits of detection and quantification (0.01-0.35 μg mL −1 and 0.03-0.98 μg mL −1 , respectively). Moreover, the adsorbent retained high adsorption efficiency after six reuse cycles, demonstrating stability and reusability. This work provides a sustainable and selective approach for flavonoid enrichment from SR and highlights the potential of DES-functionalized magnetic nanomaterials as an eco-friendly alternative to conventional organic solvent-based extraction.

Orienting Reactant Adsorption via a Bipolar Synergistic Effect for Efficient 5-Hydroxymethylfurfural Electrooxidation

Xingyi Tian,Lan Tang,Hanlin Zeng,Yulu Li,Jingdong Peng,Ming Li,Rongxing He

The electrochemical oxidation of 5-hydroxymethylfurfural (HMFOR) offers a promising route for biomass upgrading. However, its kinetics are severely hindered by the competitive adsorption between key reactive species on catalyst surfaces. Herein, we report a CoO/Ni 3 N-2:3 heterojunction catalyst that enables efficient and selective conversion of HMF to 2,5-furandicarboxylic acid (FDCA). A “bipolar synergistic adsorption effect” is identified at the CoO/Ni 3 N-2:3 interface. This effect is driven by a built-in electric field (BIEF) generated through interface polarization and the work function difference (ΔΦ) between Ni 3 N and CoO. In situ spectroscopic studies and theoretical calculations reveal that the BIEF acts as an electron sorter, directing OH − and HMF to respectively adsorb at oppositely charged regions while strengthening their adsorption. This spatially oriented adsorption effectively lowers the reaction energy barrier and suppresses competitive adsorption of key reactive species, thereby enhancing both activity and selectivity. As a result, the CoO/Ni 3 N-2:3 catalyst initiates HMFOR at a low potential of 1.18 V RHE and achieves complete HMF conversion at 1.408 V RHE with 99.2% FDCA yield and 97.2% Faradaic efficiency. This work provides an innovative strategy for designing high-performance electrocatalysts for biomass valorization.