International Journal of Electrochemical Science
·
2023
·
IF 1.5
PeiPei Li,RenChun Fu,Du Jun,Hui Huang,ZhongCheng Guo
The nature of the electrode surface plays an important role in the electrode reaction. In this study, Pb- Ag alloy anodes modified with polyaniline films were prepared by galvanostatic polymerisation. Linear scanning voltammetry (LSV), cyclic voltammetry and potentiodynamic polarisation were measured and compared with those of unprepared Pb-Ag (0.3 wt%) alloy anodes. The oxygen evolution reaction potential of the modified anodes was lower than that of the unprepared Pb-Ag (0.3 wt%) anode at same anodic current density. The corrosion resistance of the modified anode was better than that of the unprepared Pb-Ag (0.3 wt%) anode. SEM images were obtained to characterise the morphology of the polyaniline film, and FTIR spectra confirmed that the film coating the Pb-Ag alloy was polyaniline.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Defa Liu,Bin Sun,Shuojie Bai,Tingting Gao,Guowei Zhou
Solar-powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis. Nevertheless, the separation and transfer abilities of photogenerated photocatalysts remain unsatisfactory. Herein, dual Ti 3 C 2 nanosheets/Ag co-catalysts synergistically decorated hierarchical flower-like TiO 2 microspheres for boosting photocatalytic H 2 production were fabricated by electrostatic self-assembly and subsequent photoreduction procedures. The optimal Ag/Ti 3 C 2 /TiO 2 composite demonstrated an excellent photocatalytic H 2 -production rate of 1024.72 μmol g −1 h −1 under simulated solar irradiation, achieving nearly 40, 2.3, and 1.8 folds with respect to that obtained on pristine TiO 2 , optimized Ti 3 C 2 /TiO 2 composite, and Ag/TiO 2 composite, respectively. The considerably improved photocatalytic H 2 -production activity is associated with the synergistic effect of the hierarchical flower-like structure of TiO 2 , excellent electrical conductivity of Ti 3 C 2 , and surface plasmon resonance effect of Ag, which enhances the light absorption capacity and promotes the separation and transfer of photogenerated carriers. This study provides insight into the design of high-efficiency photocatalysts with dual co-catalysts for solar H 2 production.
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FOOD CONTROL
·
2023
·
IF 6
Menghu Liu,Muhammad Zareef,Afang Zhu,Wenya Wei,Huanhuan Li,Quansheng Chen
The public is seriously at risk for major health problems due to environment contamination from lead ions (Pb 2+ ) and heavy metal bioaccumulation in agricultural goods. In this study, core-shell silver-coated gold nanorods (Au@Ag NRs) were created and treated with glutathione (GSH) and 4-aminobenzoic acid (4-MBA) to monitor Pb 2+ using the surface-enhanced Raman scattering (SERS) technique. Its free carboxyl groups can chelate Pb 2+ added in solution and then present self-aggregated, bringing about more “hot spots” to acquire the significant enhancement signal of 4-MBA. The SERS intensity had a good linear correlation (y = 2420.81x+11333.62, R 2 = 0.9914) in the dynamic range of Pb 2+ concentration of 0.5–1000 μg/L under the current optimization conditions, and LOD was 0.021 μg/L. In addition, recoveries of 94.17–101.12% and 81.31–97.86% for Pb 2+ in tea powder and glutinous rice flour confirmed the monitoring accuracy of Pb 2+ , highlighting its huge potential in the monitoring food quality and safety.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Yina Tan,YaFei Hou,Qian Lin,YaQian Zhen,Peng Du,LaiHui Luo,WeiPing Li
Designing and regulating the microstructure of core–shell fillers are effective ways to fabricate polymer-based nanocomposites with excellent energy storage performances. Along this line, the unique structure combination of 0D metallic Ag nanoparticles (NPs) and 1D bark-like TiO2 nanowires (NWs) were successfully prepared. Through regulating the volume fraction of Ag NPs (x vol %) in the Ag@TiO2 NWs, the polarization and breakdown strength of Ag@TiO2/PVDF nanocomposites have been optimized, which is evidenced both by the experimental results and finite element simulation. As a result, remarkably enhanced energy storage performances are realized in these nanocomposites. For instance, the 6 vol % Ag@TiO2/PVDF nanocomposite shows an excellent performance of the highest discharged energy density of 16.3 J/cm3 at 376 MV/m, increased by 222% compared with that of pure PVDF (7.4 J/cm3, 335 MV/m). Meanwhile, its charge and discharge efficiency remain up to 77% owing to the reduction of the leakage current density caused by the Coulomb blocking effect of small-sized Ag NPs and the prolonged breakdown path resulted by TiO2 NWs. This proof-of-concept study provides an innovative design thinking of the hybrid structure for obtaining nanocomposites with extraordinary energy storage performances.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jinyu Huang,Jianwei Li,Zhonglei Zhang,Junda Li,Xiangdong Cao,Jihua Tang,Xuejin Li,Youfu Geng,Jiaqi Wang,Yu Du,Yatao Yang,Xiaofang Pan
Detecting trace ppb-level of formaldehyde (HCHO) in indoor ambient and human exhaled breath using metal oxide semiconductor (MOS) gas sensor has attracted increasing attention. Herein, Ag nanoparticles (Ag NP) modified In 2 O 3 and Au nanocage (Au NC) modified In 2 O 3 as well as bimetal Ag NP and Au NC co-modified In 2 O 3 were successfully prepared via one-step microwave-assisted solvothermal method and were used to construct semiconductor gas sensor. It is exciting to observe that the sensor based on Ag 6 Au 1 /In 2 O 3 exhibits the highest response of 277 toward 5 ppm HCHO at low operating temperature (170 °C), which is about 7 times, 38 times and 102 times higher than 6 wt. % Ag/In 2 O 3 , 1 wt. % Au/In 2 O 3 and pristine In 2 O 3 , respectively. Moreover, the selectivity and detection limit (down to 26 ppb) of Ag 6 Au 1 /In 2 O 3 sensor to HCHO have been proven to be greatly improved. This excellent sensing performance indicates that the proposed bimetal Ag and Au co-modification with synergistic catalysis effect offers an effective design for highly sensitive and efficient HCHO detection devices. Moreover, the mechanism of HCHO sensing with Au and Ag co-loaded In 2 O 3 was explored by the calculations obtained from first-principle density functional theory studies .
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Wenjing Liu,Yuanyuan Yu,Wei Cheng,Man Zhou,Li Cui,Ping Wang,Qiang Wang
The dual-function antibacterial and photothermal melanin-like nanoparticles (Ag NPs@Fe 3+ -SMNPs) were prepared and used for fabric modification. The modified fabric had excellent photothermal and antibacterial performance. By Xenon lamp irradiation, the temperature of the fabric surface rises rapidly to over 80 °C in 30 s. The modified fabric had the photothermal sterilization rates of 99% against E. coli or S. aureus after 10 min of Xenon lamp irradiation. Meanwhile, Ag NPs provided excellent antibacterial properties to the modified fabric used in daily life, and the antibacterial rate of the modified fabric was 99%. Additionally, the modified fabric showed excellent air and moisture permeability, and had excellent photothermal and antibacterial properties after 20 times of washing and 100 times of rubbing. The modified fabric was modified with the antibacterial and photothermal dual-function melanin-like nanoparticles , showing great potential in personal protective equipment (such as masks) to meet people's needs in the future.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hongwei Ding,Jingjing Yang,Rui Liu,Yan Li,Xueliang Liu,Xiangyue Wang,Lin Jin
Driven by clean solar energy, photocatalytic technology can effectively degrade organic pollutants and kills pathogenic bacteria. Researchers are always devoted to developing more economical and efficient photocatalysts. In this work, mesoporous TiO 2 nanoparticles (MTN) with controlled diameters (100–200 nm) and large specific surface areas (∼112 m 2 /g) were prepared via a simple sol–gel method. Then, 10 wt% Ag nanocrystals (∼5 nm) were in situ generated in the MTN via solvothermal process, Ti 3+ and oxygen vacancies also been introduced on their surface, thereby leading to a narrowed bandgap (∼2.9 eV) and strong absorption in the visible region. Finally, polydopamine (PDA) was decorated on the surface of Ag/bMTN to further improve their dispersity and photocatalytic activity. The degradation rate of tetracycline and the bactericide rate of E. coli could surpass 90 % and 99 %, which were mainly attributed to the generated O 2 − and the released Ag ions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mengnan Qu,Qinghua Liu,Fan Shi,Yanqing Lv,Hui Liu,Leihuan Mu,Xiaofeng Liu,Jinmei He
Three-dimensional (3D) polyurethane (PU) sponges featuring high mechanical elasticity, compressibility , and durability have emerged as an ideal substrate for building wearable strain sensors. However, the 3D porous structures easily soak up rain, water vapor , sweat, etc., and the constructed sensor’s long-term conductivity may be eroded by droplets and experience irreversible damage, rendering the preparation of a wearable flexible sponge sensor with environmental adaptation challenging. Here, by reducing the Ag particles in the carbon nanotube (CNT) suspension, forming a conductive filler Ag-CNTs, and combining with poly (vinylidene fluoride) (PVDF) solution, surface modification with polydimethylsiloxane (PDMS) solution, the PDMS/Ag-CNT-PVDF/PU sponge sensor with 3D conductive network and superhydrophobic structure was fabricated. The results revealed that this modified sponge had a wide strain detection range of 0–80 %, superior conductive sensitivity up to 4.24 kPa −1 in 0–20 kPa, and a fast and stable response time (170 ms) with great reproducibility over 1200 compression-resilience cycles. Furthermore, good superhydrophobicity endows the sensor with remarkable resistance to mechanical wear and chemical corrosion, which can be effectively used to detect human motion in high air humidity environment. This PDMS/Ag-CNTs-PVDF/PU sponge sensor is expected to be used as a practical, flexible wearable sensor and demonstrates potential application prospects in complex environments.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 18
·10743
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IF 6.208
Teng Wang,Xi Hu,Yujun Yang,Qing Wu,Chengdian He,Xiong He,Zhenyu Wang,Xiang Mao
Metal-based enzyme mimics are considered to be acceptable agents in terms of their biomedical and biological properties; among them, iron oxides (Fe3O4) are treated as basement in fabricating heterogeneous composites through variable valency integrations. In this work, we have established a facile approach for constructing Fe3O4@Ag composite through assembling Fe3O4and Ag together via polyethyleneimine ethylenediamine (PEI) linkages. The obtained Fe3O4@PEI@Ag structure conveys several hundred nanometers (~150 nm). The absorption peak at 652 nm is utilized for confirming the peroxidase-like activity of Fe3O4@PEI@Ag structure by catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. The Michaelis–Menten parameters (Km) of 1.192 mM and 0.302 mM show the higher catalytic activity and strong affinity toward H2O2and TMB, respectively. The maximum velocity (Vmax) value of 1.299 × 10−7M∙s−1and 1.163 × 10−7M∙s−1confirm the efficiency of Fe3O4@PEI@Ag structure. The biocompatibility illustrates almost 100% cell viability. Being treated as one simple colorimetric sensor, it shows relative selectivity and sensitivity toward the detection of glucose based on glucose oxidase. By using indocyanine green (ICG) molecule as an additional factor, a remarkable temperature elevation is observed in Fe3O4@PEI@Ag@ICG with increments of 21.6 °C, and the absorption peak is nearby 870 nm. This implies that the multifunctional Fe3O4@PEI@Ag structure could be an alternative substrate for formatting acceptable agents in biomedicine and biotechnology with enzymatic and photothermal properties.Keywords:Fe3O4@PEI@Ag;assembling process;enzymatic;catalytic performance;photothermal property
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 46
·24708-24716
·
IF 14.511
Chaowei Li,Wenhui Wang,Xiaojuan Sun,Haili Hou,Chen Zheng,Jinagchao Zhang,Fengjun Hou,Daojun Zhang,Jimin Du,Yagang Yao
Silver–zinc (Ag–Zn) batteries are regarded as a promising power source for flexible and wearable electronics due to their high safety, high energy density, and steady output voltage. However, the weak flexibility and poor cycle performance significantly limit the practical use of Ag–Zn batteries. In this work, we propose a novel flexible fibrous quasi-solid-state mild Ag–Zn battery with superb cycling performance by using a mild electrolyte and highly flexible binder-free electrodes. Carbon nanotube fibers serve as the current collector to improve the flexibility of flexible Ag–Zn cells. The mild electrolyte containing ZnCl2 and Na2SO4 not only prevents the dissolution of the Ag cathode but also impedes the heterogeneous growth of Zn dendrites. With 1500 cycles at 1 A g−1, the fibrous quasi-solid-state mild Ag–Zn battery achieves a remarkable capacity retention of 93.1%. Moreover, this novel flexible quasi-solid-state mild Ag–Zn battery can deliver a high capacity of 103.51 mA h g−1 at 0.1 A g−1. The fibrous quasi-solid-state mild Ag–Zn battery demonstrates remarkable flexibility and excellent bending ability (after 600 bending cycles with capacity retention of 89%). This pioneering work sheds light on the establishment of high-performance quasi-solid-state mild Ag–Zn batteries for burgeoning wearable electronics.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Juan Luo,Yong Pan,Jinkun Liu,Yan Zhu,Tao Shen,Yongmao Hu
Ag or Cu NPs are typical antibacterial agents , and the pursuit of the strong efficacy under the low dosage makes them towards bimetallic or trimetallic exploration. In this study, Ag-(CuSn) nanocolloids (NCs) based on Cu, Sn and next Ag have been prepared by two steps of the chemical reduction. Phases, morphologies, structure relationships were characterized, the elements releasing behaviors in deionized water , the antibacterial performance over S. aureus , E. coli and C. albicans and the toxicity on L929 cells were also investigated. Results showed Cu, Sn were first reduced into Cu 6.26 Sn 5 alloy, Ag was further deposited on CuSn nanoparticles to form Ag-(CuSn) NCs, the NCs showed a sphere-like morphology with average size less than 30 nm, the structure changed from Ag decorated CuSn to Ag coated one as Ag amounts increased. Ag-(CuSn) NCs displayed lower MIC/MBC than those of Ag or CuSn NPs under the synergistic effect. The suppression on Cu and Ag releasing made Ag 0.2 -(CuSn) NCs and Ag 0.8 -(CuSn) NCs perform nontoxic, both good antibacterial ability and biosafety to cells offered them a potential clinical application.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xingyu Zhao,Qi Chu,Shuang Guo,Eungyeong Park,Sila Jin,Lei Chen,Yucun Liu,Young Mee Jung
The Ag and MoO 3 layer-by-layer sputtering method was employed to fabricate Ag/MoO 3 coated on a polystyrene (PS) array (Ag/MoO 3 @PS), which exhibited excellent surface-enhanced Raman scattering (SERS) activity. The thickness of the MoO 3 layer was controlled by changing the sputtering power. The SERS intensity of 4-aminothiophenol (PATP) on Ag/MoO 3 @PS with a 2 nm thickness of the MoO 3 layer was comparable to that on pure Ag coated on the PS array (Ag@PS). This is possible because hot electrons were injected from Ag into the MoO 3 layer to enhance the photocatalyst reaction; thus, the SERS spectra of coupled PATP were obtained. The transport of hot electrons rapidly decayed and was blocked with increasing thickness of the MoO 3 layer from 2 nm to 9 nm. Thus, the SERS intensity decreased, and interestingly, the b 2 mode of PATP decreased and nearly disappeared. This study provides new insight into the control of hot electron reduction for catalytic reduction process monitoring.
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