Journal of Energy Storage
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2025
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IF 9.8
Yixuan Wen,Qingsheng Li,Yuxiang Yang,Wei Zhou,Xingao Dong,Shuo Zhang,Liqiang Zhang,Tongde Shen,Peng Jia,Yuqing Qiao
Lithium hydroxide (LiOH) as a discharge product with high conductivity and low overpotential in lithium-oxygen batteries (Li O 2 batteries) has received extensive attention. However, the incomplete decomposition of LiOH during the charge process remains a critical issue hindering the practical application of high-performance Li O 2 batteries. Developing suitable cathode catalysts is essential to address this challenge. Here, we constructed an Ag-regulated MnO cathode catalyst with disordered structure to promote LiOH decomposition, thereby improving the electrochemical performance. The introduction of Ag breaks the long-range ordered structure of MnO. Compared to that of MnO, the d-band center of Ag/MnO shifts downward from the Fermi level. This weakens the strong adsorption strength between the cathode and oxygen-containing intermediates, resulting in more moderate adsorption energy of these intermediates on the cathode surface, which facilitates the complete decomposition of discharge product. Additionally, the active sites of the Ag/MnO cathode remained stable, with LiOH decomposed completely. This work provides new insights into the development of efficient LiOH-decomposing cathode catalysts for Li O 2 batteries.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Li Tian,Yujia Song,Ruidan Li,Yanjia Guo,Pengfei Han,Guangping Ma,Hanyue Jiang,Wenzhuo Wang,Tengying Ma
A molecularly imprinted electrochemiluminescence (ECL) sensor was developed for ultrasensitive tartrazine (TZ) detection. The system employed Ru(bpy) 3 2+ encapsulated in UiO-66 as the luminophore, with tri-n-propylamine (TPrA) as co-reactant. Carbon nitride nanosheets (CNNS) functionalized with Ag nanoparticles (Ag NPs) enhanced the ECL signal through resonance energy transfer, while the UiO-66@Ru(bpy) 3 2+ /CNNS@Ag NPs/TPrA combination provided synergistic signal amplification. Selective recognition was achieved through a molecularly imprinted polymer (MIP) layer fabricated by electropolymerizing pyrrole with TZ as template. Target binding induced ECL quenching via electron transfer inhibition, enabling quantification. The sensor showed excellent performance with a wide linear range (1.0 × 10 −12 -1.0 × 10 −6 mol L −1 ) and low detection limit (3.3 × 10 −13 mol L −1 , S/N = 3). Practical utility was demonstrated through successful TZ determination in food samples, highlighting its potential for synthetic dye monitoring in complex matrices. The integration of advanced nanomaterials with MIP technology resulted in a sensitive, selective, and practical sensing platform.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Diancheng Zhu,Yiting Liu,Yangtao Qian,Miao Cheng,Tao Wei,Qianqian Liu,Ruirui Wang,Wanfei Li,Zhenxiao Fu,Haiyang Jiang,Zibo Li,Bo Liu,Jing Hu
Gallium nitride (GaN)-based gas sensors are widely recognized for their excellent carrier mobility, high-temperature resistance, and corrosion resistance, making them suitable for extreme working conditions. However, pure-phase GaN suffers from poor sensitivity and slow response/recovery rates due to its surface chemical stability. In this work, we proposed an Ag-modified GaN thin film, fabricated via magnetron sputtering, for direct integration into a sensor device for room-temperature NO 2 detection. The Ag modification is achieved through a dual approach: thermal diffusion combined with sputtering, followed by wet etching. The optimized Ag-GaN sensor demonstrates a maximum response of ∼4.3 toward 10 ppm NO 2 at room temperature (25 ± 3 °C), with excellent linearity across two concentrations range (1–10 ppm and 400–1000 ppb). The device exhibits a theoretical detection limit of ∼1.35 ppb and a response/recovery time of 150/400 s. Furthermore, the sensor shows highly reversible reaction-recovery behavior, with 2.05 % relative standard deviation (RSD), indicating outstanding repeatability. These findings advance the application of GaN-based materials in gas sensing, particularly for sensitive and reliable NO 2 detection at room temperature.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Yi Yuan,Junlin Chen,Limin Cao,Jianxin Sui,Xiudan Wang,Hong Lin,Kaiqiang Wang
Surface-enhanced Raman scattering (SERS) substrates hold great potential for rapid food monitoring, but the inability to reconcile high enhancement, uniformity, and stability presents a critical trilemma for substrate design and practical applications. Here, inspired by the hierarchical structure of lychee, we developed an innovative "integrated balanced enhancement-protection" strategy, fabricating a lychee-like Au@Ag/Au nanoarray chip via a simple, uniform oil/water/oil (O/W/O) self-assembly technique. This design mimics the architecture of lychee: the outer Au layer, modeled after lychee’s peel, provides chemical protection; the inner Au@Ag layer, mirroring lychee’s seed and flesh, delivers strong plasmonic enhancement. The unique bilayer nanoarchitecture, featuring dense and vertically coupled plasmonic hotspots, ensures highly efficient electromagnetic (EM) field by Au-Ag synergistic effects. It demonstrates an analytical enhancement factor (AEF) of 2.30 × 10 6 , uniformity with a relative standard deviation (RSD) of 6.55 %, and stability with 93.26 % signal retention over 60 days. When coupled with a universal pretreatment protocol to minimize matrix interference, the platform enables sensitive and reliable quantitative detection of three representative food additives, including potassium sorbate (PS), sodium benzoate (SB), and sodium saccharin (SS) in complex fruit matrices. The limit of detection (LOD) for all analytes was below 75 mg/kg, substantially surpassing the national regulatory standards of China. Importantly, the chip demonstrated high recoveries (86.62–102.49 %) and low RSD (< 9 %) across multiple fruit types. Beyond food safety, this scalable, low-cost approach not only overcomes SERS substrate bottlenecks but also provides a viable field-deployable tool with broader implications for SERS-based analysis.
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Analytical Methods
·
2025
·
IF 2.6
Junaid Younus,Qi Wang,Weifan Pan,Jimin Shao,Xiaowei Guo,Xue Yang
Surface-enhanced Raman scattering (SERS) is a rapid, sensitive, and non-destructive technique for pesticide detection. However, most reported studies focus on single-analyte detection, and the simultaneous detection of multiple pesticide residues in complex matrices such as tobacco leaves remains challenging. In this study, we developed a portable SERS platform for the simultaneous detection of pendimethalin, propamocarb, and carbendazim using a polystyrene@silver (PS@Ag) core–shell substrate. The method enabled rapid detection (<15 min) with limits of detection (LODs) of 0.1 mg kg−1 for carbendazim, 5 mg kg−1 for pendimethalin, and 10 mg kg−1 for propamocarb in individual analyte detection, which meets the European Union's maximum residue limits (MRLs). In ternary mixtures, the LODs were 1 mg kg−1 for carbendazim, 5 mg kg−1 for pendimethalin and 10 mg kg−1 for propamocarb with strong linearity (R2 = 0.97–0.98). The substrate exhibited uniform enhancement with relative standard deviations (RSDs) of 3.53% for pendimethalin, 7.76% for propamocarb, and 4.70% for carbendazim, and high sensitivity, achieving enhancement factors for all target pesticides (3.4 × 101 for pendimethalin, 3.7 × 101 for propamocarb, and 6.0 × 103 for carbendazim). To the best of our knowledge, this is the first report to demonstrate that a PS@Ag SERS substrate combined with a portable Raman spectrometer serves as a highly reliable and promising tool for on-site monitoring of multiple pesticide residues in food safety and environmental applications.
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PubMed
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Xiaoqi Liu,Yanyun Zhang,Yan Liu,Ting'an Zhang
In this paper, a novel grafted zeolite/Fe 3 O 4 /chitosan (ZMC-MAH-TEPA) adsorbent was greenly synthesized and evaluated for the removal of Cr(VI) and Ag(I) in single and bi-component solutions. The characterization data of XRF , XRD, FT-IR, VSM, TGA , BET and SEM showed the successful fabrication of the adsorbent with abundant -NH 2 and -NH- as well as great recovery properties (11.70 emu/g). The effects of experimental parameters, including pH value, initial concentration, temperature, time, and coexisting ions on single and bi-component adsorption, were investigated. The results demonstrated that the adsorption capacities increased with the enhanced shaking time and concentration until equilibrium was reached. The optimum pH value was 3 for Cr(VI) adsorption and 5 for Ag(I) adsorption. The maximum adsorption capacities for Cr(VI) and Ag(I) ions, obtained by the Langmuir model, were 50.75 and 70.12 mg·g −1 in single metal solutions and 45.45 and 58.94 mg·g −1 in bi-component metal solutions (Cr(VI)/Ag(I) = 1:1), respectively. Additionally, the adsorption mechanism of Cr(VI) and Ag(I) was explained in terms of electrostatic interaction and hydrogen bonding between metal ions and -NH 2 and -NH- in ZMC-MAH-TEPA. Taken together, this study provides a clean approach to synthesizing chitosan-based adsorbents for the efficient removal of Cr(VI) and Ag(I) ions.
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NANO
·
2021
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IF 1.556
M. M. Xia,J. Li,Y. Y. Zhang,D. N. Kang,Y. L. Zhang
Nanosized TiO 2 has been actively developed as a low-cost and environment-friendly anode material for lithium-ion batteries (LIBs), but its poor electronic conductivity seriously restricts its practical applications. This drawback is addressed in this work by the fabrication of one-dimensional mesoporous graphene@Ag@TiO 2 composite nanofibers as anode materials for high-performance LIBs. The materials were prepared via electrospinning combined with annealing treatment, and the effects of graphene addition on the microstructure and electrochemical performance of the resulting mesoporous graphene@Ag@TiO 2 nanofibers were investigated in detail. Ag@TiO 2 nanofibers with the optimal amount of graphene displayed a maximum initial discharge capacity of 4 9 0 . 5 mAh ⋅ g − 1 at 1 0 0 mA ⋅ g − 1 and retained a discharge capacity of 2 0 9 . 1 mAh ⋅ g − 1 at 1 0 0 mA ⋅ g − 1 after 100 cycles. These results reflect the excellent cycling stability of the material. The average specific discharge capacity of the nanofibers ( 9 7 . 6 mAh ⋅ g − 1 at 1 0 0 0 mA ⋅ g − 1 ) was two-fold higher than that of samples without graphene, and their discharge capacity returned to 2 5 3 . 8 mA ⋅ g − 1 (approximately 9 6 . 2 mA ⋅ g − 1 for other nanofibers) when the current density was recovered to the initial value ( 4 0 mA ⋅ g − 1 ) . Electrochemical impedance spectroscopic measurements confirmed that the conductivity of the electrode was 6 . 3 × 1 0 − 1 S ⋅ cm − 1 , which is higher than that of bare mesoporous Ag@TiO 2 ( 1 . 9 9 × 1 0 − 5 S ⋅ cm − 1 ). Thus, one-dimensional mesoporous graphene@Ag@TiO 2 nanofibers can be regarded as a promising anode material for LIBs.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Yu Han,Xiaohui Fang,Zhoutao Sun,Chen Kang,Lei Zha,Xinping Zhang
Surface-enhanced Raman scattering (SERS) is a rapid and nondestructive spectroscopic method for trace detection. The enhancement based on both electromagnetic and chemical mechanism requires the molecules to be in close contact with the SERS-active material. Therefore, it is difficult to detect trace amounts of molecules in liquid directly. In this paper, graphene oxide (GO) and Ag nanoparticles (AgNPs) are uniformly modified on the inner wall of the capillary. GO can provide chemical enhancement by adsorbing the analyte onto its flat surface and producing efficient charge transfer resonance with the analyte. AgNPs can provide strong localized surface plasmon resonance for electromagnetic enhancement, while capillary can shorten the molecular enrichment time and provide long light–analyte interaction length. The synergism of GO, AgNPs, and capillary makes the optofluidic platform have the ability of ultrasensitive and real-time detection. The detection limit of Rhodamine 6G and thiram is as low as 10–12 and 10–10 M, respectively, and the enhancement factor is as high as 0.9 × 1010 and 108, which indicates that the SERS-active capillaries have great potentials in real-time ultratrace detection of water environment pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiao-Han Pan,Ling-Xiao Fu,Huan Wang,Yi Xue,Jian-Hua Zu
A novel sulfydryl-functionalized adsorbent PP-g-GMA@MEA for recovery of Ag(I) was synthesized by γ-ray induced simultaneous grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) non-woven fabric, followed by ring-opening processes with mercaptoethylamine (MEA). The obtained adsorbents before and after adsorption of Ag(I) were fully characterized by SEM, EDS, FT-IR spectra, XRD and XPS. Batch adsorption experiments were carried out to evaluate adsorption abilities of the adsorbents under high acidity. The adsorption kinetics of Ag(I) were well fitted with pseudo-second-order kinetics model. The maximum adsorption capacity calculated by the Langmuir isotherm model was 262.51 mg/g at 25 °C. EDS, XRD and XPS analyses confirmed the mechanism of adsorption under high acidity was chelating reaction between -SH and Ag(I) and ion exchange adsorption towards [Ag(NO 3 ) 2 ] −1 . Through competitive adsorption tests, the PP-g-GMA@MEA was found remarkably selective towards Ag(I) when it coexisted with Cu(II), Co(II), Ni(II) and Cr(III) in high acidity medium. Therefore, the developed PP-g-GMA@MEA composite would be a promising adsorbent for Ag(I) recovery from industrial effluents.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
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IF 7.664
Mingli Han,Zhicheng Shi,Wenqiang Zhang,Kun Zhang,Huanlei Wang,Davoud Dastan,Runhua Fan
High dielectric permittivity materials are widely employed in various electronic devices. To satisfy the ongoing miniaturization of electronic devices, materials with further enhanced dielectric permittivities are strongly desired. In this work, a novel design of epoxy composites based on Ag/Al 2 O 3 /3D-BaTiO 3 foams with hierarchical heterogeneous microstructures are prepared. It is found that, the spatial distribution of the Ag particles can be easily controlled via adjusting the Ag + /Al 3+ mole ratios, yielding highly tailorable dielectric properties. When the Ag + /Al 3+ mole ratios are low, the Ag particles are well isolated by surrounding Al 2 O 3 , yielding the formation of numerous equivalent micro-capacitors and substantially enhanced dielectric permittivity. Moreover, the dielectric permittivities of the composites increase with higher Ag + /Al 3+ mole ratios. Consequently, a high dielectric permittivity of 160 @10 kHz, which is about 35 times that of the epoxy matrix, is achieved in the composite with a Ag + /Al 3+ mole ratio of 1.8. Meanwhile, a low tangent of about 0.062 is maintained. As the Ag + /Al 3+ mole ratio increases, the Ag particles become interconnected, forming Ag networks. Consequently, a plasma-like negative phenomenon which should be attributed to the plasma oscillation of free electrons in the percolative Ag networks, is observed. This work offers an effective route to design polymer composites with tailorable high permittivity and negative permittivity.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 7
·1371-1382
·
IF 5.344
Yunjian Yu,Lin Mei,Yanmei Shi,Xinge Zhang,Kesong Cheng,Fengyi Cao,Liuxue Zhang,Jia Xu,Xiumin Li,Zhenlong Xu
The increasing prevalence of antibiotic resistance highlights the need for new antibacterial drugs and, in particular, the development of alternative approaches such as photodynamic therapy (PDT) and photothermal therapy (PTT) to manage this growing issue. In the present study, a broad-spectrum antibacterial system was produced in which Ag nanoparticle-conjugated graphene quantum dots (GQD–AgNP) were utilised as a blue light-enhanced nanotherapeutic for efficient ternary-mode antimicrobial therapy. The successful conjugation of AgNPs onto the surface of GQDs can significantly improve the production of reactive oxygen species in light-activatable GQDs and the transformation of light energy to hyperthermia with high efficiency. There was a remarkable increase in the sample temperature of nearly 40 °C via photoexcitation after only 10 min of 450 nm laser exposure (14.2 mW cm−2). The hybrids exhibited much more efficient bactericidal capability against both Gram-negative and Gram-positive bacteria compared with GQDs alone, using 450 nm light irradiation. This is likely a consequence of their enhanced PDT, concomitant PTT, and the synergistic function of AgNPs. The antibacterial mechanism of the new-style nanocomposites was found to irreversibly destroy the bacterial membrane structure, leading to the leaking out of the cytoplasmic contents and the death of the bacteria. At low doses, the biocompatible GQD–AgNP hybrids promoted healing in bacteria-infected rat wounds, with negligible adverse impact to the normal tissue, indicating a promising future for combined photodynamic and photothermal antibacterial applications in clinical medicine.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 36
·6392-6399
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IF 3.756
Yuhan Kong,Gongguo Zhang,Chunyu Wang,Yanyun Ma,Yiqun Zheng
Noble metal Janus nanocrystals involving components with the same crystal structure and close lattice constants are technically difficult to produce as anisotropic growth is not favored under general deposition conditions. Herein, taking Au and Ag, we describe a feasible synthetic strategy to create Au–Ag Janus nanoparticles (JNPs) with tunable sizes, which exhibit multiple plasmonic absorptions in the UV-vis range. The success of the current synthesis lies in the surface doping of trisoctahedral (TOH) Au seeds with limited amount of Pt/Ag atoms to introduce a relatively large lattice strain during the seeded growth, which is found crucial to facilitate the anisotropic deposition of Ag. In contrast, the use of undoped Au seeds leads to the formation of Au@Ag core–shell nanoparticles. The size of resulting products could be tuned by varying the amount of the added Ag precursor or the size/quantity of Au seeds. Compared to core–shell counterparts, the current Au–Ag Janus nanoparticles exhibit more plasmonic absorption peaks. Owing to such advantages, the current Au–Ag Janus nanoparticles show enhanced catalytic properties in the reduction of 4-nitrophenol under UV-vis light irradiation. The current study provides a feasible strategy that allows the fabrication of Janus bimetallic nanocrystals with elements having a close lattice constant and validates the promising use as plasmonic catalysts, which could be potentially extended to other metals or alloys.
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