Journal of Energy Chemistry
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2017
·
IF 2.594
Qingyong Li,Guorong Duan,Jie Luo,Xiaoheng Liu
In this study, the Ag/AgCl/WO 3 plasmonic Z-scheme photocatalysts with different contents of Ag/AgCl nanoparticles (NPs) were prepared through a facile ultrasonic precipitation method in geothermal water , wherein the geothermal water served as the chlorine source. Then the photocatalytic activity was investigated by degradation of 4-Aminobenzoic acid (4-ABA) under visible-light irradiation. It was found that the as-prepared 50 wt% Ag/AgCl/WO 3 photocatalyst showed the highest photocatalytic efficiency with 25.12 and 3.53 times higher than those of pure WO 3 and Ag/AgCl, respectively. The active species trapping experiments indicated that h + and ·O 2 − were key factors in 4-ABA photodegradation process. The possible plasmonic Z-scheme photocatalytic mechanism of photocatalytic reaction for 4-ABA degradation was proposed based on systematical characterizations. We hope this paper could give new ideas for further exploiting geothermal energy to design and fabricate highly efficient visible-light-driven photocatalysts for environmental remediation.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
·
IF 9.463
Di Zhang,Bing Zhou,Jie Yu,Chengen He,Bo Wang,Yuezhan Feng,Chuntai Liu,Changyu Shen
The anisotropic three-dimensional (3D) Ag-welding graphene framework prepared by unidirectional ice-templating freezing casting, was used to encapsulate polyethylene glycol (PEG) as phase change material (PCM) composite in this work. Arising from the decreased interfacial thermal resistance (ITR) in graphene skeleton by Ag-welding and the vertically oriented graphene skeleton as phonon transfer paths, the obtained PCM composite exhibited a high thermal conductivity of 4.3 W m −1 K −1 at graphene loading of ∼6.25 vol%, which improved significantly the heat transfer rate during the heat charging/discharging processes. Meanwhile, the graphene framework gave the PCM composite an excellent solar-thermal conversion ability, which could be further enhanced by Ag-welding strategy. Besides, the 3D porous framework with huge capillary and surface tension forces effectively improved the shape stability and avoided leakage of PCM, with meanwhile remaining high energy storage capacities (147.4–165.9 J g −1 ). Therefore, the Ag-welding 3D graphene framework reveals the high potential to encapsulate PCM using in solar-thermal conversion field.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Jianxin Liu,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
For detecting the active roles of ZIF-8 in composite photocatalyst , a novel Ag/AgCl/ZIF-8(50%) composite photocatalyst was designately prepared by anchoring Ag/AgCl nanoparticles on the surface of ZIF-8 with 50% content. The adsorption and photocatalytic performance of Ag/AgCl/ZIF-8(50%) were conducted by removal of Rhodamine B (RhB) from aqueous solution under dark and visible light irradiation (λ > 420 nm). The experimental results showed that the as-synthesized Ag/AgCl/ZIF-8(50%) exhibited higher photocatalytic activity than Ag/AgCl. The XRD , TEM , FTIR, DRS, VB XPS, ESR, N 2 adsorption isotherms and active species trapping experiments were used to characterize the performance of the composite photocatalyst. We found that the ZIF-8 in composite photocatalyst not only has the adsorption ability for RhB by its large specific area, but also has the ability for the formation of O 2 · − by an appropriate position of conduction band (CB). A reasonable reaction mechanism with a new perspective on the composite photocatalyst of Ag/AgCl/ZIF-8(50%) was proposed. This insight on the active roles of ZIF-8 in Ag/AgCl/ZIF-8(50%) may open a window for the use of MOF material in photocatalytic field.
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Journal of Physical Chemistry C
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2012
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IF 4.805
Qiao An,Meng Yu,Yuting Zhang,Wanfu Ma,Jia Guo,Changchun Wang
The heterostructure Ag–Au bimetallic nanocrystals supported on Fe3O4@carbon composite microspheres were synthesized by one facile and controllable approach, wherein the Ag nanocrystals attached on the Fe3O4@carbon microspheres were prepared first and served as reductant for the galvanic replacement reaction with the Au precursor (HAuCl4). Upon varying the feeding amounts of the Au precursor, the bimetallic compositions on the Fe3O4@carbon microsphere could be readily tuned resulting in a series of composite microspheres with different Au-to-Ag molar ratios. Subsequently, we thus investigated the catalytic activity and selectivity of the magnetic composite catalysts from two sides. First, 4-nitrophenol (4-NP) was applied as a model molecule to study the effect of different Au-to-Ag molar ratios on catalytic capabilities of the resulting composite microspheres. It was found that upon the addition of NaBH4 the catalytic capability was markedly enhanced when the Au content was increased. The maximum activity parameter value reached 1580 s–1 g–1, which is far higher than those of known monometallic composites. Also, they could give the equally high yields for other nitroaromatic compounds with various substituents, irrespective of the linked electron-donating or electron-withdrawing groups. Second, the synergistic effects of the carbon substrate in the catalysis reaction were demonstrated. When compared with colloidal SiO2, TiO2, and poly(styrene-co-acrylic acid) substrates, the carbon support not only facilitated the enhancement of the catalytic performance of the noble metal nanocrystals but was also more suitable for the in situ preparation of Au–Ag bimetallic nanocrystals using the GRR. Besides, the particles’ convenience in terms of their magnetic separability and outstanding reusability was validated through many successive reduction reaction cycles. In light of these unique characteristics, the Fe3O4@C@Ag–Au composite microspheres show promising and great potential for practical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Qingyong Li,Fulei Wang,Yuxiang Hua,Yuting Luo,Xiaoheng Liu,Guorong Duan,Xujie Yang
A series of novel visible-light-driven Ag/Ag 3 PO 4 /WO 3 (AAPW) Z-scheme heterostructures were fabricated using a facile deposition-precipitation method followed by photo-reduction without adding any surfactant . To explore more deeply about the photocatalytic activity of AAPW nanocomposites under neutral and strongly acidic/alkaline conditions, we investigated their photocatalytic rhodamine B (RhB) efficiency at different pH value that was controlled by adding HNO 3 or NaOH aqueous solution. It was found that as-prepared AAPW photocatalysts showed enhanced photocatalytic RhB efficiency under neutral and even strongly acidic/alkaline environment. The process of charge carrier separation and transfer in the AAPW nanocomposites and Z-scheme mechanism for RhB degradation were described in sufficient detail based on systematical characterizations and measurements. The silver particles introduced to build AAPW Z-scheme structure should contribute to more efficient charge separation, resulting in enhanced photocurrent response and photocatalytic activity . We expect that this work will provide systematic study concerning Z-scheme Ag/Ag 3 PO 4 /WO 3 structure, and fulfill the research about photodegrade activity of catalyst under strongly acidic/alkaline conditions.
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JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 12
·6772-6783
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IF 1.938
Hou Xiaoshuo,Yang Ming,Yu Hui,Yang Ying,Li Dan,Dong Xiangting
In this work, a 3D Z-scheme photocatalyst Ag/AgBr/Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (Ag/AgBr/ZVO) was synthesized by a hydrothermal method, and a subsequent surface deposition-optical reduction technique. The prepared flower-like Ag/AgBr/ZVO was characterized by scanning election microscopy (SEM), x-ray powder diffraction (XRD), x-ray photoelectron spectroscopy (XPS), UV-vis spectrophotometry, N 2 adsorption-desorption isotherm based on Brunauer-Emmett-Teller (BET) theory, and electrochemical tests. The photocatalytic degradation performance of the catalyst was investigated by the degradation of methylene blue (MB) dye by visible light irradiation. Compared with bare Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (ZVO) nanoflowers, the photocatalytic effect of the 3D Z-scheme heterojunction Ag/AgBr/ZVO was significantly enhanced. The catalyst of 2h-Ag/AgBr/ZVO exhibited the strongest photocatalytic activity, of which the MB degradation rate is about 98.8% in 100 min, which was about five times that of pure ZVO. The increase in the photodegradation rate is ascribed to the accelerated interface charge-transfer process, the faster photogenerated carrier separation rate and the enhancement of visible light absorption. In view of the trapping of the reaction intermediate and the electron spin resonance (ESR) measurement, we propose a possible Z-scheme photocatalytic mechanism. This improved visible-light response likely originates from a synergistic effect of the different components. This work offered an ideal method for producing stable, efficient, and recyclable photocatalysts suitable for use in the visible light range.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Zihan Wei,Zhenyin Hai,Mohammad Karbalai Akbari,Zhenting Zhao,Yongjiao Sun,Lachlan Hyde,Francis Verpoort,Jie Hu,Serge Zhuiykov
Surface functionalization of two-dimensional (2D) WO 3 nanofilms by noble metal (NM) nanoparticles (NM = Ag, Pt and Pd) was successfully achieved for the first time via combination of the atomic layer deposition (ALD) process and electrochemical deposition method. Deposited NM nanoparticles were uniformly in the particle size and homogeneously dispersed on the surface of 2D WO 3 . They represented electrochemically active metal-semiconductor hybrid nanocomposites with the larger electroactive area, and consequently, substantially enhanced the electrochemical H 2 O 2 detection of the device based on functionalized 2D WO 3 nanofilms. Functionalization by Ag was found to be more efficient compared to the same functionalization by Pt and Pd nanoparticles. Particularly, Ag 200 -WO 3 nanofilms exhibited the best electrochemical performance with a high sensitivity of 282 μA mM cm −2 , extremely wide linear H 2 O 2 concentrations range from 0.2 μM to 33.6 mM, a low detection limit of 0.1 μM, fast response time of 2 s and an excellent selectivity and long-term stability. Surface functionalization by NM nanoparticles approach has clearly demonstrated the great potential in the development of hybrid nanostructured electrode for various devices with enhanced electrochemical capabilities.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Di Xu,Lingfeng Duan,Wenlin Jia,Guohai Yang,Yingqiu Gu
Noble metal nanoparticle aggregates are attracting increasing interest as SERS active substrates for the ultrasensitive detection of environmental and biological samples. Deposition of noble metal nanoparticles on magnetic metal oxide is an effective way to not only realize the assembly of noble metal particles, but also enrich analytes in highly diluted solution. Herein, Ag@Fe 2 O 3 hybrid was prepared by a simple method and applied for sensitive and recyclable SERS detection. The low detection limit of R6G (LOD = 9.3 × 10 −10 M) and CV (LOD = 1.7 × 10 −9 M) demonstrated the excellent sensitivity for SERS application. The high stability during long-term detection illustrated the super detection capability of the Ag@Fe 2 O 3 hybrid substrate. The synergistic effect of the electromagnetic enhancement originated from nanogaps between densely and closely distributed Ag nanoparticles, the chemical enhancement from semiconductor material of Fe 2 O 3 and the magnetic enrichment of the analyte molecules was account for the excellent SERS performance of the Ag@Fe 2 O 3 substrate. As a result, the Ag@Fe 2 O 3 hybrid substrate was successfully applied to detect bilirubin in human blood and showed excellent detection ability (LOD = 2.3 × 10 −8 M).
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TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Chuang Zhu,Yilong Tian,Yafei Zhao,Yuqi Wang,Xuqing Liu
Self-lubricating fabric composites are essential in tackling problem of friction and wear for joint bearings. Controlling tribological properties of them largely hinges on manipulation of thermal conductivity. Although frictional heat transfer can be enhanced by adding functional fillers in resin matrix, they still face dilemma of poor mechanical performance. Here we report Ag-coated basalt fibers containing self-adherent levodopa/polyethyleneimine, strategically positioned between Ag films and basalt fibers to enhance interface adhesion. Benefiting from rough, continuous and compact Ag coatings, as-made composites exhibited thermal conductivity of 0.63 W/m·K and tensile strength of 240.8 MPa, representing increases of 950% and 91%, respectively, compared to conventional counterparts, enabling superior anti-wear characteristics. This polymer-assisted metal deposition approach is promising to produce long-life self-lubricating fabric composites.
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Surfaces and Interfaces
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2025
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IF 6.3
Aidi Xie,Jia Zhang,Chun Chen,Yunxia Zhang,Haimin Zhang,Huijun Zhao,Guozhong Wang
Semi-hydrogenation of syngas-based dimethyl oxalate (DMO) to valuable methyl glycolate (MG) intermediate has attracted considerable attention recently, while the yield of MG remains a challenge due to thermodynamically favorable continuous hydrogenation of DMO to ethylene glycol (EG). Silver catalysts were reported to be effective but suffered from low stability. Herein, we precisely designed an amino-functionalized mesoporous silica (NH 2 -MS) nanospheres-encapsulated Cu-Ag bimetallic catalyst (CuAg@NH 2 -MS) by a hybrid strategy of EDTA-modification and vacuum-impregnation. The designed bimetallic catalyst exhibited the best compromise between conversion and selectivity with a high MG yield of ∼96.3%, outperforming the unmodified CuAg@MS and mono-metallic Cu@NH 2 -MS and Ag@NH 2 -MS catalysts. Transmission electron microscope analysis revealed that amino-functionalization can effectively disperse and stabilize Cu-Ag nanoparticles. Hydrogen temperature-programmed reduction and X-ray photoelectron spectroscopy confirmed enhanced electron transfer between Cu and Ag species, as well as between Cu-Ag nanoparticles and the NH 2 -MS support. The highly dispersed active metals and enhanced electron interaction ultimately enabled a high MG yield by breaking the trade-off between DMO hydrogenation activity and MG selectivity. This robust catalyst also exhibited remarkable stability in continuous operation for 300 h in a fixed bed reactor. This work will facilitate precise construction of stable metal nano-catalysts for efficient catalytic selective hydrogenation.
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产品关联
DOI
高影响因子
SOLAR ENERGY
·
2025
·
IF 6.6
Yan Zhu,Bin Yao,Zhanhui Ding,Yongfeng Li,Liyuan Shi,Chunkai Wang,Ding Ma,Mengge Li,Yue Liu,Ning Ding,Yuting Sun,Xiaofei Sun,Shaung Li
In this work, non-uniform Ag and In co-doped CZTSSe (NoU-Ag x In y , x = Ag/(Ag + Cu) = 0–15 %, y = In/(In + Zn + Sn) = 0–12 %) was prepared by doping Ag at the front surface of CZTSSe and doping In at the back surface of CZTSSe. CZTSSe solar cell with conventional structure but without anti-reflection layer was fabricated by using the NoU-Ag x In y as absorber (Cell-NoU-Ag x In y ). Through optimizing the Ag and In doping concentration, the highest PCE of 11.82 % was achieved in the cell-NoU-Ag x In y with x = 10 % and y = 8 %. It is higher than the highest PCE (9.05 %) of CZTSSe solar cells obtained in this work and the highest PCE (9.45 %) of uniform Ag and In co doped CZTSSe solar cells with similar doping concentrations of Ag and In. Compared to CZTSSe solar cell, the increased PCE of cell-NoU-AgIn is dominantly due to decreased J 0 , followed by increase in J L . The decrease in J 0 is mainly attributed to reduce in number of [2Cu Zn + Sn Zn ] defect clusters and of ZnSe at front interface induced by Ag doping, as well as formation of passivation field at back interface induced by In doping. The increase in J L is mainly due to increase in depletion region width induced by the Ag doping and formation of the passivation field. This study demonstrates that non-uniform Ag and In doped CZTSSe is favorable to increasing PCE of CZTSSe solar cells.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Li Sun,Zheng Ye,Yuan Zhi,Hua Zhang,Binlin Dou,Yuejin Shan,Jian Chen
In this study, a prospective strategy on seed-mediated growth in vacuum is provided and used to prepare flexible silver nanofilms (AC 0–3 NFs) with high purity, crystallinity and SERS performance. Noteworthy, AC 2 NFs surface is uniformly covered with silver nanoparticles (Ag NPs), following the appearance of numerous nano-gaps between Ag NPs. Through the finite-difference time-domain (FDTD) simulation, it is found that the ultra-small nano-gaps less than 5 nm can generate abundant “hot spots” to amplify the Raman signal. Therefore, the above AC 2 NFs as SERS substrates exhibit superior activity for the SERS detection of thiram in tomato juice, with the limit of detection (LOD) of 10 −15 M and the enhancement factor (EF) of 3.7 × 10 11 . Meanwhile, AC 2 NFs show outstanding reproducibility and stability during the SERS detection. Additionally, the calibration curve is established, by which the thiram (10 −7 to 10 −15 M) can be quantitatively detected. Clearly, the as-prepared flexible AC 2 NFs have great potential in the SERS detection and analysis.
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