CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xi Zhou,Yibing Xie,Lu Wang,Langlang Wang,Xiang Li,Ping Ning,Xueqian Wang
Graphene has recently emerged as a nano-functional material with great potential in the field of photocatalysts. Doping graphene quantum dots (GQDs) into CdS by a simple hydrothermal method led to a unique hexagonal CdS prism structure that assembled into nanospheres, simultaneously inducing intergranular Z -Scheme heterojunctions of the (001) and (100) plane families in CdS. As a result, the CdS-GQDs composite exhibited excellent removal efficiencies for gaseous mercury (Hg 0 ), exceeding 95% under visible light and 90% over photocatalytic cycles. Experimental and optical characterization results indicated that the photoresponse of the composite photocatalyst was broadened due to the doped GQDs. Furthermore, density functional theory calculations revealed that the formation of a Z -scheme heterojunction between the two crystal planes of CdS generated an internal electric field in CdS, resulting in a novel carrier transfer channel. Through GQD doping, this work successfully addressed the occurrence of serious photocorrosion in CdS, providing a novel composite dedicated to the efficient removal of Hg 0 from flue gas under visible light.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hui Su,Furong Ye,Siyi Zhang,Changcun Han,Jipeng Dong,Zhixin Dai,Xinguo Ma,Lei Ge
The sluggish anodic oxygen evolution reaction (OER) kinetics remains a critical bottleneck for sustainable hydrogen production via water electrolysis. Guided by Density Functional Theory (DFT) calculations, we engineered Fe-CoS 2 /Ni 3 S 4 dual-site catalysts where Co 3+ and Fe 3+ centers synergistically optimize p-d orbital hybridization to enhance OER kinetics. Operando analyses reveal Co 3+ as primary active sites facilitating rate-limiting OOH* → O 2 desorption with Gibbs free energy (ΔG) reduced by 0.94 eV, while Fe-induced electron delocalization lowers intermediate coupling barriers. Notably, the catalyst facilitates dynamic reconstruction, generating metastable Co 3+ species with optimized eg orbital occupancy (t 2 g 5 eg 1 configuration) and strengthened p-d hybridization via Fe-mediated charge transfer. This electronic synergy enables ultralow overpotentials of 156 mV (hydrogen evolution reaction HER) and 230 mV (OER) at 50 mA cm −2 , with a cell voltage of 1.48 V for overall water splitting at 10 mA cm −2 . The dual-site architecture simultaneously suppresses metal dissolution (<12 % after 20 h) while maintaining 89.2 % initial activity. This work establishes a dual-regulation strategy: atomic-level orbital engineering for OER intermediate optimization and dynamic surface reconstruction for HER-active phase stabilization, offering a paradigm for designing robust bifunctional electrocatalysts.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Guidong Xu,Shuo Geng
Activating the inert basal plane of MoS 2 is considered to be an efficient strategy to enhance the HER activity of MoS 2 . Herein, the adjacent S sites in the basal plane were activated by doping cu into MoS 2 nanosheets (cu-MoS 2 ). The density functional theory (DFT) calculation and experimental results show that the electronic structure of S sites adjacent to cu was adjusted. Furthermore, the ∆GH* of adjacent S sites around cu in the basal plane is closer to zero, indicating that the adsorption of H on MoS 2 was also optimized. Benefiting from the activation of adjacent S sites around cu in the basal plane, the obtained cu-MoS 2 nanosheets exhibit a small overpotential of 172 mV to achieve 10 mA cm −2 in acid media with a low Tafel slope of 49 mV decade −1 . This strategy, which involves doping-triggered activation of adjacent inert active sites, can be expanded to other two-dimensional materials for boosting electrocatalytic activity
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhichao Li,Yuhong Du,Gaoshuang Zuo,Jin Wang,Chao Wang,Li Guo,Yanzhong Wang
Metal-organic frameworks (MOFs) have been a hot topic as oxygen evolution reaction (OER) electrocatalysis owing to their superior specific surface area, plentiful metal active sites and modifiable morphology and composition. Nonetheless, the low electronic conductivity, restricted active sites and lack of structural robustness in MOFs impede their efficacy as catalysts in water electrolysis processes. Herein, nickel thiophenedicarboxylic framework@Ni 3 S 2 (Ni-TDC@Ni 3 S 2 ) composites were prepared on a nickel foam substrate via a two-step hydrothermal method. The results indicate that Ni 3 S 2 not only regulates the morphology and local electronic structure of Ni-TDC, but also enhances the structural stability, which leads to the superior OER performance with an overpotential of 220 mV at 10 mA cm −2 , and the Tafel slop of 50.76 mV dec −1 . Furthermore, the assembled overall water electrolysis device with Ni-TDC@Ni 3 S 2 and RuNi-TDC as anode and cathode electrodes requires the voltage of only 1.50 V at a current density 10 mA cm −2 , and it can run stably for more than 70 h. This study provides a new idea for enhancing the electronic conductivity of MOF-based electrocatalysts for efficient water oxidation.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Rouyan Guo,Congcong Dang,Yiping Liu,Guangqi Zhang,Lingti Kong,Liancheng Zhao,Liming Gao
Developing an efficient and highly catalytic cathode is crucial to the advancement of rechargeable Li-O 2 batteries for utilizing their high theoretical energy density. However, due to the sluggish kinetics of the oxygen-involved reactions, the problems of short lifespan and large overpotential prevent their widely practical applications. Thus, cathodes are designed to enhance the adsorption capacity for oxygen and modulate the electron mobility for Li-O 2 batteries. Herein, NiAl layered double hydroxide (LDH)@Cu 2 S heterostructure with extremely large specific surface area and numerous exposed active sites is designed, combining snowflake-shaped Cu 2 S and dispersed two-dimensional layered NiAl LDH. Excitingly, NiAl LDH@Cu 2 S cathode exhibited a large specific discharge capacity of 14,519 mAh g -1 at a current density of 100 mA g -1 and prolonged cycle life up to 275 cycles at 300 mA g -1 with a cut-off capacity of 600 mAh g -1 , accompanied by a low discharge overpotential of 0.14 V at the first cycle. Theoretical calculations demonstrated that the excellent electrochemical performance stems from the optimized adsorption energy of the NiAl LDH@Cu 2 S structure for reactants and intermediate products, which reduces the energy barrier of discharge/recharge process. Therefore, benefited from the modulation of electron mobility and the promoted adsorption of oxygen, NiAl LDH@Cu 2 S heterojunction can display remarkable cycle stability and reversibility as the cathode catalyst, suggesting great application prospects for enhanced Li-O 2 batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhihong Liu,Jiale Liu,Jin Wang,Ping Lu,Shishun Xu,Yi Lu,Xiaofei Li,Qiaowen Zhang,Guocan Jiang,Zhengquan Li
The urgent need for clean energy has driven extensive research into efficient photocatalytic systems for CO 2 reduction. Lead-free Cs 3 Bi 2 Br 9 perovskites are particularly promising in this context, yet the photocatalytic performance of single-component Cs 3 Bi 2 Br 9 is often hindered by its narrow absorption in visible-light range. Here, we present a visible-to-near-infrared (vis-to-NIR) responsive Cs 3 Bi 2 Br 9 /Bi 19 Br 3 S 27 Z -scheme heterojunction photocatalyst, achieved by creating a high-quality interface upon in-situ growth. This heterojunction design markedly boosts CO₂-to-methane conversion, achieving electron consumption rates that are 70 and 124 times higher than those of pristine Cs 3 Bi 2 Br 9 and Bi 19 Br 3 S 27 , respectively. Mechanistic studies indicate that the formation of a strong built-in electric field at the interface facilitates efficient charge separation and transfer, significantly boosting photocatalytic performance. Notably, the photocatalytic performance of Cs 3 Bi 2 Br 9 /Bi 19 Br 3 S 27 heterojunction surpasses that of most lead-free halide perovskite photocatalysts. Our findings offer a new paradigm for interface engineering in photocatalysis and advance the development of vis-to-NIR responsive perovskites for sustainable energy conversion.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Nanzhi Zheng,Yuchen Yang,Wenhao Huang,Jianting Zhang,Guohua Chen
Red fluorescent carbon dots (RCDs) have garnered significant attention in the fields of lighting and bioimaging due to their exceptional optical properties and favorable biocompatibility. However, existing synthesis strategies often involve complex processes and rely on expensive, toxic polycyclic aromatic hydrocarbons, which fundamentally limit their yield and applicability. In this study, RCDs with a high quantum yield of 45 % were synthesized via a one-step solvothermal method using citric acid and urea as precursors, with boric acid as a catalyst. The introduction of boric acid induced a red shift in the fluorescence emission wavelength of the carbon dots from 468 nm to 651 nm. The yield of high-purity RCDs extracted from the crude product increased from 1 % to 55.4 %, and they could be easily separated via centrifugation. These RCDs significantly enhanced the color rendering performance of white light-emitting diodes (LEDs) and demonstrated satisfactory biocompatibility for cell imaging applications. Notably, the catalytic activity of boric acid was also observed in the synthesis of RCDs from other precursors, resulting in varying degrees of red shift in the fluorescence emission wavelength. This study establishes a foundation for environmentally sustainable, cost-effective, and scalable synthesis of RCDs.
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Analytical Methods
·
2025
·
IF 2.6
Yuli Mei,Shuo Yang,Minghui Su,Jianjun Xie,Shengfeng Huang,Zhengjin Jiang,Yang Huang
A nitrogen-doped carbon dots (N-CDs)-based fluorescent sensor was developed for ultrasensitive and selective detection of mercury ions (Hg2+) in complex matrices, such as Panax notoginseng (Burk.) F. H. Chen (Sanqi). The synthesized N-CDs exhibited intense blue fluorescence (quantum yield: 35%) with an ultra-small size of 1.93 ± 0.53 nm. Leveraging dynamic quenching mechanisms, the sensor achieved a linear detection range of 0–50 μM for Hg2+ and an exceptionally low limit of detection (LOD) of 0.2825 nM, outperforming existing CD-based sensors. The N-CDs demonstrated remarkable selectivity for Hg2+ in the presence of interfering ions and complex herbal components. Hg2+ in Sanqi samples was quantified by fluorescence analysis (25.5–26.8 μg kg−1, RSD < 2.0%) and cross-validated via Inductively Coupled Plasma Mass Spectrometry (ICP-MS) (24.8–26.2 μg kg−1, RSD < 1.0%), demonstrating N-CDs’ reliability for precise Hg2+ detection. Additionally, the N-CDs exhibited excellent biocompatibility and were successfully applied for cellular imaging in A549 cells, showcasing their dual functionality in environmental monitoring and biomedical diagnostics.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Luobai Yang,Wenxiang Liu,Xiaoxiang Hu,Zhiwang Sun,ZhenZhen Chen,Jinnong Wang,Ze Wang,Dongye Zhao,Yong Li,Shifeng Wang
Electrolysis for hydrogen production, a green and environmentally friendly method, still faces significant challenges. To achieve large-scale commercialization, a catalyst with long-term stability, large current density, high activity, and low cost is needed. In this study, a simple hydrothermal method is employed to prepare a nonprecious metal-based catalyst of molybdenum disulfide (MoS2) and CoFe-layered double hydroxide (CoFe-LDH) grown on the surface of nickel foam (NF). The rich porosity of NF and the lamellar structure of CoFe-LDH provide abundant active sites and promote bubble escape. The MoS2 on the CoFe-LDH surface not only further enhances the conductivity of CoFe-LDH but also provides additional electrochemical active surface area (ECSA) with its fluffy structure while modulating the electronic structure of the reactive active sites. These advantages make the sample MoS2/CoFe-LDH/NF exhibit substantially low overpotentials of 224/255/278 mV for oxygen evolution reaction (OER) and 211/297/331 mV for hydrogen evolution reaction (HER) at current densities of 10/50/100 mA cm–2, respectively, low Tafel slopes of 57.91 mV dec–1 for OER, and 113.17 mV dec–1 for HER. Moreover, the electrocatalyst presents good stability with no significant degradation after 250 h for OER and 200 h for HER at a large current density of 150 mA cm–2. In full water electrolysis, it only requires 1.70 V to achieve a current density of 10 mA cm–2. This study opened up a method for the design and synthesis of highly efficient bifunctional electrocatalysts for oxygen and hydrogen production.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Yawen Zhang,Hongli Zhang,Jiangong Ma,Jing Zhao,Huajuan Yin,Xu Jing,Xiaowen Wang
With the advent of new-generation green extraction solvents, deep eutectic solvents (DESs) present significant prospects for the extraction of bioactive substances. In this study, saponins were extracted from oats using an ultrasonic-assisted method with green DESs, replacing conventional toxic organic solvents. Adding sodium chloride markedly reduced solubility, resulting in the separation of two phases from the extract: DES and water. The saponins were separated into the water phase, while the DES was reused in subsequent extractions, supporting extractant recycling and promoting sustainable development. Adding salt offers a more gentle, convenient, and cost-effective alternative to current phase separation methods, such as pH adjustment, temperature variation, and carbon dioxide or nitrogen gas application. Optimizing the extraction and recovery parameters yielded the highest oat saponin extraction efficiency at 18.73 mg g –1 , and the recovery was 86.4 %. When compared with ethanol extracts, DES extracts exhibited superior antioxidant activity. Lastly, the greenness of this extraction method was confirmed through three greenness evaluation programs of greenness. The extraction method based on emerging responsive solvents can be extended to other hydrophilic bioactive substances.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 7
·1-14
·
IF 2.4
Li Shunming,Hu Pengyu,Qu Jingzong,Zhou Jie,Wang Zibo,Wang Yanan,Sun Tao,Chen Anran
Hydrogen evolution reaction (HER) in alkaline media demands cost-effective and highly active electrocatalysts to replace noble metals. Herein, we report a ternary MoS₂/Ni₃S₂/Ni(OH)₂ nanoflower composite supported on nickel foam (NF) via a facile one-step electrodeposition strategy. This method enables precise control of MoS₂ morphology while mitigating aggregation-induced active site blockage. The synergistic interplay among MoS₂ (exposing edge sites), conductive Ni₃S₂, and Ni(OH)₂ (modulating electronic structure) significantly enhances HER kinetics. Notably, the optimal catalyst (5-min deposition) achieves ultralow overpotentials of 48 mV at 10 mA cm⁻² and 175 mV at 100 mA cm⁻² in 1.0 M KOH, surpassing most reported Ni- or Mo-based catalysts. Furthermore, it exhibits exceptional stability with negligible activity loss after 5000 cycles and 72-hour continuous operation. XPS analysis reveals that a high Mo⁴⁺/Mo⁶⁺ ratio facilitates electron delocalization, accelerating hydrogen intermediate desorption. This work establishes a new paradigm in HER catalyst design through interface-engineered ternary systems. By unifying electronic synergy theory with the SPRE synthesis method, we overcome the activity-stability trade-off plaguing binary catalysts. The demonstrated 500-hour stability at industrial current densities (100 mA cm⁻²) positions this approach as a transformative solution for scalable green hydrogen production. Graphical
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xinmei Qian,Chunxiang Li,Mingyu Zheng,Keqin Deng
A flower-like S, N-codoped carbon nanosheets loaded with hybrid magnetic nanoparticles (HMNPs/S,N-CNSs) by using MOF as precursor was prepared. The morphology, composition, microstructure, and property were evaluated by SEM, HRTEM, EDS, XRD, XPS, magnetic analysis, and cyclic voltammetry. The hybrid nanoparticles were composed of most Fe 3 O 4 , some CoFe alloy, and a few Fe 2 S. The magnetic material showed high magnetism and brilliant electrocatalysis towards the electrochemical reduction of antibiotic nitrofurazone (NFZ). By utilizing screen-printed electrode (SPE) and HMNPs/S,N-CNSs, a disposable electrochemical NFZ sensor (HMNPs/S,N-CNSs/SPE) was fabricated by magnetic control. The current signal of NFZ at HMNPs/S,N-CNSs was 6.38 times higher than that of bare SPE. It displayed a wide detection range of 0.01–50 μM with a detection limit of 4.2 nM (S/N = 3). The practical applicability of the sensor in real samples presented satisfactory results. The disposability, low cost, high sensitivity, low consumption volume in analyses, and good selectivity make the proposed sensor a promising tool for NFZ detection.
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