APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ling Zhang,Yiquan Xie,Yiwen Jiang,Yaobin Li,Chunying Wang,Shichao Han,Huimin Luan,Xiangju Meng,Feng-Shou Xiao
Catalytic combustion at low temperature has been considered as an effective route for removal of indoor HCHO pollutant, and conventional catalysts are supported noble metal nanoparticles, which are costly for wide applications. Solution of this issue is to use relatively low metal catalysts. Herein, we report that Mn-promoted Ag catalyst supported on pure silica Beta zeolite with a good hydrophobicity is very active for catalytic combustion of HCHO. By optimizing the loadings of Ag and Mn, it is found that 10 wt% Ag with 8 wt% Mn (10 %Ag8 %Mn/Beta-Si) exhibits highest activity, giving the complete HCHO conversion at around 45 °C, which steadily outperform the temperatures (70–145 °C) for full oxidation of HCHO reported previously. The choice of Ag loading with 10 wt.% is due to the highest exposed surface of Ag sites, and the use of Mn loading with 8 wt% is assigned to the balance of density and mobility for active oxygen species in the catalysts. The strategy combining the hydrophobic supports with optimized active oxygen species might offer an alternative way to develop highly efficient heterogeneous catalysts for the removal of air pollutants in the future.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 5
·4528-4533
·
IF 3.277
Wan Li,Xiaoping Zeng,Hong Wang,Qin Wang,Yajiang Yang
Glutathione–Ag (GSH–Ag) supramolecular hydrogels have almost no mechanical strength, and the disassembly of GSH–Ag complexes occurs very easily under UV irradiation. In this work, low molecular weight polyvinyl alcohol (PVA) was used to reinforce GSH–Ag gels. The phase transition temperature of GSH–Ag gels can be increased from 45 to 60 °C in the presence of only 0.8 wt% of PVA. Rheological studies indicated that the storage modulus of reinforced GSH–Ag gels was 6 times higher than that of unreinforced gels. SEM studies revealed that the macromolecular chains of PVA are intertwined with the GSH–Ag aggregates, leading to an increase of mechanical strength. The TEM studies and UV-vis spectra indicated that Ag+ within the GSH–Ag gels was in situ reduced to form Ag nanoparticles under UV irradiation. Meanwhile, gradual disassembly of GSH–Ag hydrogels can be induced through controlling the time of UV irradiation. Based on this feature, the controllable release of a loaded model drug (crystal violet) and Ag species can be realized from the reinforced GSH–Ag gels. The release media show a good inhibition effect on E. coli.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Lin Huang,Maoqing Chen,Ying Yang,Qingshou Zheng,Li Gu,Ruobing Cheng,Xuebo Cao
Electro-reforming of organics such as alcohols into commodity chemicals and H 2 powered by renewables is intriguing and prevailing with the remarkable renaissance of electrochemical technology. Integrating Pt/Pd with an auxiliary metal, metal oxide, and metal hydroxide are feasible strategies to design the desirable catalysts toward alcohols electro-oxidation reactions. These catalysts however have high affinity toward carbonyl intermediates that occupy and poison the active sites. Thus, the target products suffer from poor selectivity. To address these issues, a facile binary Pt–Ag alloy nanowires (NWs) catalytic system was reported for efficient electro-oxidative reforming of ethylene glycol (EG), yielding glycolate with a selectivity of 91.5 %, an EG conversion of 96.4 %, and Faradaic efficiency (FE) of 87.4 %. Experimental and theoretical investigations revealed that Ag-induced electronic structure perturbations in Pt 0.66 Ag catalyst boosted the kinetics and robustness as a conventional promoter toward EG electro-oxidation reaction (EGOR). Moreover, the one-electron oxidation of water/hydroxide ion to generate abundant hydroxyl adspecies (OH ad ) on Ag served as another crucial promoter for efficient dehydrogenation, glycolate formation, and carbonyl intermediates release via a highly efficient, noncompetitive Langmuir–Hinshelwood (L–H) mechanism, but not the competitive L–H mechanism or the Eley–Rideal (E–R) mechanism. These findings provide new insights into the selective alcohol electro-oxidation reaction, and facilitate the generation of commodity chemicals via partial electro-oxidation reactions.
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DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 6
·9276-9286
·
IF 3.2
Shuya Ning,Shuya Ning,Zhihui Liu,Shuo Wang,Naming Zhang,Bin Yang,Xin Wang,Fanghui Zhang
All-inorganic halide perovskite quantum dots (QDs) have recently received much attention due to their excellent optoelectronic properties. And their emission properties still need to be improved for further applications. Here, we demonstrated a remarkable emission enhancement of the CsPbBr3 QDs based on an Ag nanoparticle-Ag film plasmonic coupling structure. Through precise control of the gap distance between Ag nanoparticle and Ag film, the localized surface plasmon resonance (LSPR) peak was tuned to match the emission wavelength of the CsPbBr3 QDs. We achieved a 30-fold fluorescence intensity enhancement and a lower lasing threshold, which is 25% of that of the CsPbBr3 QDs without plasmonic coupling structure. It is attributed to that the plasmonic coupling structure exhibits an extremely strong local electric field owing to the coupling between LSPR of Ag nanoparticle and surface plasmon polariton of Ag film. This work provides an effective way to enhance the optical emission of perovskite QDs and promotes the further exploration of on-chip light source.
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DOI
PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1715-1729
·
IF 5.044
Liu Hongyu,Yang Lin,Zhan Yifei,Lan Jianwu,Shang Jiaojiao,Zhou Mi,Lin Shaojian
In this work, a durable and sunlight-driven self-cleaning superhydrophobic cotton fabric was developed as a multifunctional oil/water separation material. First of all, Ag/AgCl was successfully deposited on the polydopamine modified cotton fabric surface by electrostatic adsorption, then the Ag/AgCl loaded fabric was coated by the polydimethylsiloxane (PDMS) via simple dip-coating method. The as-prepared cotton fabric (PDMS-Ag/AgCl@CF) presented the superhydrophobic property with water contact angle about 155°. Meanwhile, the prepared PDMS-Ag/AgCl@CF exhibited great tolerance and resistance to broad pH and various organic solvents, and it can also withstand 50 cycles of abrasion or 60 min of ultrasound treatment without an apparent decrease of superhydrophobicity, indicating its outstanding mechanical durability. As expected, this durable superhydrophobic fabric can availably separate various oil/water mixtures by gravity-driven force with high separation efficiency (over 97.8%), and it possessed good reusability. Additionally, the PDMS-Ag/AgCl@CF exhibited an outstanding self-cleaning performance under sunlight irradiation, due to visible light photocatalytic performance of Ag/AgCl. Finally, the resultant cotton fabric displayed good antibacterial activity. Therefore, in consideration of its prominent comprehensive performances, it is expected that the PDMS-Ag/AgCl@CF can be used as a promising material for oily water remediation.
研究领域:
材料科学
·
环境科学
·
光催化
·
抗菌材料
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高影响因子
CELLULOSE
·
2014
·Vol. 21
·期 6
·4557-4567
·
IF 3.033
Feng Jin,Shi Qingshan,Li Wenru,Shu Xiulin,Chen Aimei,Xie Xiaobao,Huang Xiaomo
In order to improve the antimicrobial activity of bacterial cellulose (BC), the silver nanoparticles (Ag NPs) were in situ fabricated on the BC membranes, affording BC and Ag hybrid antimicrobial materials, BC + Ag, which possesses excellent antimicrobial performance. Typically, carboxyl groups were firstly introduced into BC by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation. Then, the carboxyl-functionalized BC was performed with ion-exchange reaction to change the sodium ions into Ag + by immersing in AgNO 3 aqueous solution, generating Ag + anchored BC. Finally, two types of distinct reductive reagents including NaBH 4 and sodium citrate were employed to transform Ag + into Ag NPs to fabricate BC + Ag. The diameters of Ag NPs were determined to be 3.8 nm for NaBH 4 -reduced BC + Ag, and 22.0 nm for sodium citrate-reduced one, respectively. The silver content of BC + Ag were determined to be 1.944 and 2.895 wt% for NaBH 4 -reduced sample and sodium citrate-reduced one, respectively. Two types of BC + Ag both showed a slow and persistent Ag + release profile, but the NaBH 4 -reduced one released much more Ag + than that of sodium citrate under the same measurement condition. In-depth antibacterial analysis via the disc diffusion and colony forming count method disclosed that BC + Ag exhibited strong bactericidal effects against both Escherichia coli and Staphylococcus aureus . And the antibacterial activity of NaBH 4 -reduced BC + Ag was higher than the sodium citrate-reduced one. Overall, this study would further improve the antibacterial efficiency of BC + Ag.
研究领域:
材料科学
·
微生物学
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高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Yingjie Niu,Ziqi Wang,Biqi Yang,Hui Cheng,Ao Li,Yuanyuan Tan,Linbo Bian,Chenglin Yi,Kaifu Zhang
Temperature sensors are widely used in daily life and industry. Developing low-cost, scalable, high-sensitivity conformal temperature sensors with a broad detection range is highly desirable. In this study, we prepared a hybrid functional ink composed of silver nanoparticles (Ag NPs) and silver nanowires (Ag NWs) via physically mixing for aerosol jet printing (AJP). The resulting Ag NPs/Ag NWs-0.5% ink exhibited a fine printing resolution of 10 µm and excellent conductivity up to 1.95 × 10 7 S/m. After 1000 bending cycles, the resistance increased by only 2.22%, which is 3.6 times better than that of pure Ag NPs ink. The sintering of the hybrid ink promoted densification of printed traces, enhancing the temperature coefficient of resistance (TCR) to 2.71 × 10 −3 /°C at 30 °C, enabling precise monitoring across a broad temperature range of 0–240 °C. Molecular dynamics (MD) simulations revealed Ag nanomaterial growth and densification mechanisms during sintering. High-quality conformal temperature sensors were also successfully fabricated on curved structures and applied for accurate temperature monitoring during the battery discharging process of new energy vehicles. These findings underscore the significant potential of emerging AJP technology in the fabrication of high-performance conformal sensing electronic devices.
研究领域:
材料科学
·
纳米技术
·
柔性电子学
·
传感器与传感技术
·
增材制造
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Hongxia Liu,Meng Wang,Xuqiang Zhang,Jiantai Ma,Gongxuan Lu
The development of an active but cheaper catalyst is critical for efficient photocatalytic hydrogen from renewable source. In this study, we develop a high active catalyst for hydrogen evolution from formaldehyde via alloying of Pd with Ag and sensitization with a dye eosin Y (EY). The XRD, XPS, TEM and HRTEM characterizations indicate that the catalyst exhibits a core-shell structure (Ag core and Ag-Pd shell). Alloying Pd with Ag not only provides more efficient catalytic sites than single component Pd catalyst, but greatly promotes the efficient electron transfer and prolongs the lifetime of photogenerated electrons, enhances the charge separation efficiency and the photocatalytic hydrogen evolution activity significantly. The catalyst activity for hydrogen is highly dependent on the adsorption energies of HCHO and H 2 O molecules on metal surface of the alloy catalyst. Our results disclose a new route to high efficient catalyst development for solar hydrogen generation from formaldehyde.
研究领域:
材料科学
·
能源化学
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Runze Wei,Junhong Jia,Rui Deng,Mengrong Tian,Xuan Ren,Zongyu Zhang,Yun Shi,Nairu He,Jie Yang
To investigate the influence of different powder addition strategies on the properties of Ag-containing lubricating coatings, NiCrAlY-Mo-Ag-Cu coatings incorporating different (Ag, Cu) powders (direct doping, core-shell structure, and powder alloyed) were fabricated via atmospheric plasma spraying. Combining characterization techniques and density functional theory calculations, the friction behavior, tribological properties, and underlying mechanisms of the three coatings were explored through constant-temperature friction tests and thermal cycling friction tests over a wide temperature range. The results indicate that the core-shell structure process helps reduce coating porosity (from 2.61% to 1.68%), but the average hardness of the coating decreased by 12.5% (230.6 HV → 201.8 HV). The alloying strategy circumvented hardness degradation, striking a balance between coating densification and mechanical robustness. At 800 ℃, a composite tribofilm comprising simple metal oxides (e.g., NiO, Cr 2 O 3 , and Al 2 O 3 ) and high-temperature lubricating phases (NiMoO 4 , Ag 2 MoO 4 , CuMoO 4 ) developed on the surface, effectively suppressing silver agglomeration and depletion. Owing to the synergy of these effects, the AgCu-alloyed coating achieved a low coefficient of friction (COF) of 0.25 at 400 ℃ and demonstrated a ∼30.9% reduction in wear rate during the 800 ℃ thermal cycling test compared to the direct-doping coating.
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高影响因子
VACUUM
·
2026
·
IF 4.3
Wangqiong Xu,Baiyan Guo,Xianrong Li,Kun Xu,Zhe Li,Shimei Guo
Spinel LiMn 2 O 4 with excellent cycling performance and low cost has been regarded as the most promising cathode material for lithium-ion batteries. However, the manganese dissolution and electrolyte decomposition significantly compromise structural stability, thereby hindering large-scale practical implementation. Here, we propose a surface modification strategy to enhance the structural stability of the LiMn 2 O 4 cathode using Ag nanoparticles as coating materials, where the size of the Ag nanoparticles is controlled by adjusting the decomposition temperatures of AgNO 3 to 600, 700, 750, and 800 °C. Combining the detailed structural characterization and performance characterization, we find that surface coating with the largest-sized Ag nanoparticles with 10.02 nm contributes to stabilizing the interface between the cathode materials and electrolyte, reducing the decomposition of electrolyte, and improving ion diffusion kinetics. Consequently, the corresponding Ag/LiMn 2 O 4 heterostructure exhibits outstanding cycle performance, with an initial discharge capacity of 101.6 mAh g -1 and capacity retention of 84.45% after 1000 cycles at 5 C under 25 °C. Our work demonstrates an effective method to improve the structural stability of LiMn 2 O 4 .
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jie Yang,Ling Zhou,Xin-Yue Wang,Gao Song,Li-Jun You,Ju-Mei Li
Herein, the robust core-satellite Ag/TiO 2 /Ag composite nanospheres were successfully developed. We firstly fabricated large silver nanoparticles with sufficient plasmonic activity as cores and then encapsulated uniform titanium dioxide interlayer shell around Ag cores, which serves as the highly functionalized substrates to achieve uniform and plentiful surface chemical properties. Next, the outer shell of small silver satellites was formed in-situ via controllable reduction of AgNO 3 by n -butylamine, which acts as the remarkable enhancer for surface enhanced Raman scattering (SERS). The Ag/TiO 2 /Ag composite nanospheres with exceptional SERS sensitivity were easily prepared via facilely tuning the coverage and grain sizes of silver satellites. Then the optimized Ag/TiO 2 /Ag composite nanospheres were employed to quantitatively detect methylene blue (MB) in solution. The results showed good linear relationship between SERS intensities and logarithm concentrations of MB and the limit of detection is low to 10 −10 M. Moreover, the highly uniform and robust Ag/TiO 2 /Ag composite nanospheres display outstanding reproducibility (RSD = 4.02%) and highly storage stability. Owing to the intrinsic catalytic activity of small Ag satellites, Ag/TiO 2 /Ag nanospheres were further applied to effectively follow the degradation reaction process of crystal violet by SERS. Altogether, the core-satellite Ag/TiO 2 /Ag nanospheres present multiple SERS application potential in various fields, such as quantitative chemical analysis, trace detection of pollutants and in-situ reaction monitoring.
研究领域:
材料科学
·
分析化学
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高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Keqing Zhang,Hangda Chen,Baoquan Xiao,Jie Chen,Wei Yan,Yanpeng Liu,Changfa Hu,Long Chen,Juanjuan Huang,Shanglong Peng
Layered manganese oxide has rich active sites, amounts of variable valence states, and economic feasibility, so it has attracted wide attention. In aqueous zinc ion batteries, its poor conductivity and easy solubility in water limit its performance as an electrode. Therefore, we used a simple one-step hydrothermal method to prepare Ag+ intercalated MnO2 for aqueous zinc-ion batteries’ cathode. An in-depth exploration of the electrochemical phenomenon of Ag–MnO2 found that interlayer Ag+ regulates the electronic structure of MnO2 and reduces the Jahn–Teller effect, and the desolvation of Ag–MnO2 is easier, which promotes the embedding of Zn2+. In addition, the migration of Ag+ and the in situ formation of Ag metal particles also enhance the conductivity of the electrode. As a result of the Ag+-Ag0 synergistic effect, Ag–MnO2 has obtained high rate performance (275.6 mA·h·g–1 at 200 mA·g–1) and excellent cycle stability (98.8% capacity retention over 600 cycles at 1000 mA·g–1). This provides insights for the pre-inserted Ag+ to improve the electrochemical performance of MnO2.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
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高影响因子
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