SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qiong Sun,Bing Han,Kaijing Li,Liyan Yu,Lifeng Dong
Photocatalytic fuel cell (PFC) is a novel energy conversion device that can effectively convert light into chemical energy and then electrical energy, accompanied with the pollutant purification treatment by photocatalytic technology. In this study, the synergetic photocatalytic degradation of organic dye in anode and the reduction of heavy metal Cr(VI) in cathode are carried out in an improved dual-chamber PFC device with TiO 2 and core–shell structured Ag@Fe 2 O 3 nanoparticles as photoanode and cathode materials , respectively. Among different materials, Ag@Fe 2 O 3 shows the highest catalytic activity to the reduction of Cr(VI) with an apparent kinetic constant of 0.058 min −1 , even much better than commercial Pt foil (0.027 min −1 ). From morphology and electrical characterizations, the excellent electrical conductivity of noble metal Ag and suitable conduction band positions between TiO 2 and Fe 2 O 3 lead to a rapid and directional transfer of photoinduced electrons, and the variable valence of Fe(II)/(III) in iron oxide facilitates continuous catalytic reduction of Cr(VI) to Cr(III). Moreover, the addition of H 2 O 2 into anode chamber can significantly accelerate the reactions and electricity output. The radical quenching tests prove that the existence of H 2 O 2 can efficiently increase the production of photoinduced carriers, and more oxidizing species (such as O 2 − and OH) can be produced from the reactions between H 2 O 2 and photoinduced holes or electrons.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Qin Zhang,Jiancong Liu,Dongxu Wang,Chengxu Jin,Li Fang,Xingyu Li,Yingjie Jiang,Xin Wang,Chungui Tian
The construction of strong metal-support interaction (SMSI) between ultrasmall metal nanoparticles and semiconductor supports remains a pivotal challenge in developing high-performance photocatalysts for selective CO2 conversion. Herein, we propose a coordination-induced in-situ confinement strategy that synchronously achieves high dispersion of small-sized Ag nanoparticles (Ag NPs) and SMSI with ultrathin C3N4. Through melamine-mediated Ag-N coordination bonds, this approach orchestrates three synergistic effects: (1) Coordination-induced confinement of Ag NPs (~3.3 nm) via covalent Ag-N linkages, yielding an increase in active site density and stability compared to conventional Ag/C3N4; (2) Enhanced electron transfer from C3N4 to Ag, extending carrier lifetimes and suppressing charge recombination; (3) Interfacial electronic redistribution that promotes the generation of *COOH intermediates, steering the reaction pathway toward CO with high selectivity. Furthermore, the coordination-induced thermal condensation induces nitrogen vacancies in C3N4, which act as molecular traps to enhance CO2 adsorption capacity and synergize with Ag sites for efficient CO2 activation. As a result, the optimized catalyst exhibits a remarkable CO yield of 70.63 μmol·g-1·h-1 without the use of sacrificial agents, along with high selectivity (> 98 %) and excellent stability. This work establishes a universal paradigm for engineering metal-semiconductor interfaces through coordination chemistry, offering transformative insights into solar-driven CO2-to-fuel conversion technologies.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Peilin Jia,Dongzhi Zhang,Xingyan Shao,Jieshuo Zhai,Jishun Guo,Zijian Wang,Xinyi Ji
Hydrogen (H 2 ), as a clean energy source, exhibits significant promise in the realm of new energy vehicles. Utilizing hydrogen sensors with rapid response and high selectivity is crucial for monitoring vehicles and preventing hydrogen leakage incidents. In this study, In 2 O 3 nanomaterials were synthesized via a hydrothermal approach and effectively modified with Ag/Cu bimetallic nanoparticles to fabricate high-performance hydrogen sensors. The optimal work temperature for the Ag/Cu–In 2 O 3 sensor is determined to be 300 °C. At this temperature, the sensor exhibited a response of 9.66–100 ppm H 2 , which is four times higher than the pristine In 2 O 3 sensor. Excellent H 2 selectivity and outstanding long-term stability were exhibited by the sensor in typical interference gas environments encountered in new energy vehicles. The significant enhancement in sensor performance is attributed to the electronic and chemical sensitization effects of Ag/Cu bimetals and the synergistic effects of bimetallic modification. Additionally, computational studies based on density functional theory (DFT) further elucidated the reasons for the improved H 2 gas sensing performance of Ag/Cu–In 2 O 3 nanocomposites. The Ag/Cu–In 2 O 3 nanocomposites show great potential for hydrogen detection applications in the sensor field.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2024
·
IF 6
Junhan Xu,Binghong Chen,Kunpeng Yuan,Jun Shu,Qiguo Yang
Ag@SiO 2 nanofluid is widely used in spectral splitting PV/T system. Its core–shell structure has great influence on the optical properties. In this work, we focus on the comprehensive analysis and structure optimization of Ag@SiO 2 nanofluid to achieve its optimal spectral performance. DDA method is used to predict the optical properties of Ag@SiO 2 nanofluid and an optimization model based on filter efficiency is proposed. The effect of the SiO 2 shell thickness and Ag core mass concentration is analyzed. It indicates that the spectral performance of Ag@SiO 2 nanofluid can be improved with SiO 2 shell thickness of 15–40 nm and Ag core mass concentration of 81–135 mg/L. To achieve the same theoretical merit function of 1.46, the usage of Ag mass can be reduced by 25/33/44/62 % with SiO 2 coating of 10/20/40/70 nm. The optimal structure to achieve the highest filter efficiency η of 37.8 % is with a shell thickness of 20 nm and a mass concentration of 113.9 mg/L. An indoor PV/T operation testing is conducted to verify the optimization results. The merit function of Ag-based nanofluids increases from 1.58 to 1.598 and a reduction in Ag usage of 17 % is achieved with a SiO 2 coating shell of 17.8 nm. Operation stability is also enhanced with no aggregation observed during the working cycle and 7-day static experiment.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Fei Liu,Thien-Phap Nguyen,Qin Wang,Florian Massuyeau,Yi Dan,Long Jiang
Constructing a conductive interface is crucial for the transfer of photoexcited charges in the photocatalytic heterojunction system. In this study, we introduced Ag into g-C 3 N 4 /P3HT system to construct a conductive interface which benefits for transfer of photoexcited charges between g-C 3 N 4 and P3HT. A series of characterizations were employed to investigate the chemical structure , morphology and optical property of the obtained catalysts. And the photocatalytic activity of the as-prepared g-C 3 N 4 /Ag/P3HT composites were evaluated by the degradation of tetracycline (TC) and methyl orange (MO) aqueous solution under visible light irradiation. Results show that the g-C 3 N 4 /Ag/P3HT exhibits a broad absorption band in the region of 400–700 nm and the photocatalytic activity of g-C 3 N 4 /Ag/P3HT obtains a great improvement comparing with that of g-C 3 N 4 , g-C 3 N 4 /Ag and g-C 3 N 4 /P3HT. In addition, the optimized loading content of P3HT is 0.3 mass% based on g-C 3 N 4 . The enhanced photocatalytic performance is due to the introduction of Ag, which improves the transfer of photoexcited charges between g-C 3 N 4 and P3HT. The active species trapping experiment shows that the main active specie is O 2− . After five recycling experiments, the g-C 3 N 4 /Ag/P3HT shows high stability in the photocatalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Wang Yutong,Liu Yizhi,Liang Xiao,Liu Zhiyuan,Yang Yaling
This study successfully developed a colorimetric/SERS dual-mode sensor for determining acrylamide in baked goods based on the excellent peroxidase-like activity and Raman activity of Fe-PHS@Au–Ag-Au Janus NPs. In colorimetric mode, the thiol-ene Michael addition between acrylamide (AA) and glutathione (GSH) efficiently eliminates GSH-induced peroxidase-like activity inhibition. The peroxidase-like activity of Fe-PHS@Au–Ag-Au Janus NPs gradually recovered, and the blue color of the solution gradually deepened with the increase in AA dosage. In surface-enhanced Raman spectroscopy (SERS), Apt-Fe-PHS@Au–Ag-Au Janus NPs can selectively capture AA and bind specifically, leading to the dissociation of Apt and Fe-PHS@Au–Ag-Au Janus NPs. The Raman activity of Apt-Fe-PHS@Au–Ag-Au Janus NPs decreases due to the dissociation of Apt. The dual-mode sensor was utilized for the determination of acrylamide in the concentrations range from 0.05 to 20 µg·L −1 with detection limits of 0.06 µg·L −1 (SERS) and 0.01 µg·L −1 (colorimetric). The recovery in baked samples was between 91.0 and 108.0%. Graphical
研究领域:
食品科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 3
·1-11
·
IF 2.4
Wang Xiuqing,Yan Ruiyao,Fu Jianyu,He Yan,Zheng Jiahuan,Liu Liu,Zhou Na
The practical application of Cu 2 O in the field of photoelectrocatalytic (PEC) hydrogen production has been limited by its relatively low photoconversion efficiency and electron mobility. Plasmonic metal nanoparticles have been utilized to enhance the charge separation of semiconductors through resonance energy transfer from metal nanoparticles to semiconductors. In this study, Ag nanosphere (Ag NS)@SiO 2 were combined with Cu 2 O to form triple core–shell nanocomposites, aiming to enhance the photoelectrochemical activity of Cu 2 O under visible-light irradiation. The microstructures of the Ag@SiO 2 @Cu 2 O nanocomposites were regulated by controlling the thickness of SiO 2 interlay and Cu 2 O shell in order to optimize the PEC efficiency. It was found that Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs exhibited the highest photocurrent intensity, showing 3.3 times, 11.9 times, and 17.8 times higher values than pure Cu 2 O, pure Ag NS, and AgNS@SiO 2 NPs respectively. Furthermore, the photoelectrocatalytic hydrogen production velocity of Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs was around 25 mmol·g −1 ·h −1 , which has been improved around 4.2 times compared to pure Cu 2 O. This enhanced performance is attributed to plasmon-induced resonance energy transfer from Ag metal nanoparticles to Cu 2 O semiconductor, which may improve the separation efficiency of electron–hole pairs and lead higher photoelectrocatalytic efficiency. Graphic The Ag NS@SiO 2 was integrated with Cu 2 O to form triple core–shell nanocomposites, aiming to enhance the photoelectrochemical activity of Cu 2 O under visible-light irradiation through plasmon-induced resonance energy transfer from Ag to Cu 2 O. And their photoelectrocatalytic performances were optimized by controlling the thickness of SiO 2 interlay and Cu 2 O shell. Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs exhibited superior photocurrent intensity and enhanced photoelectrocatalytic hydrogen production rate compared to pure Cu 2 O.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 5
·056519
·
IF 1.62
Yanqing Xue,Qitang Hao,Bo Li,Xinliang Wang,Chengze Yin,Han Zhang
To surmount the longstanding puzzle of strength-ductility trade-off, efforts had been made to apply Mg - Ag microalloying on 5%TiB2/Al-4.5%Cu composites by in situ molten salt reaction and subsequent heat treatment. The obtained composites achieve an eye-catching tensile elongation (δ) of 6.1 ± 0.4%, while maintaining elevated ultimate tensile strength (UTS) of 497 ± 4 MPa and yield strength (YS) of 401 ± 3MPa. Comprehensive characterization demonstrated that the uniformly distributed TiB2 particles together with semi-coherent grain boundaries between the α-Al matrix and reinforcement phase (TiB2 particles, Ω-Al2Cu, σ-Al5Cu6Mg2) facilitated the dislocation motion integrally, which eliminated the stress concentrations, may be the main reason for amelioration in the strength-ductility trade-off of the composites when subject to rigorous multi-step heat treatment.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Rui Wu,Yulin Wang,Xi Song,Hairan Zhang
Antibiotic residues in food and environment pose a serious threat to human's health and ecological system. Therefore, it is crucial and urgent challenge to fabricate Surface-Enhanced Raman Scattering (SERS) substrate with high sensitivity to detect pesticide residues. A multifunctional three-layer Fe 3 O 4 /HAP/Ag nanoparticle system was fabricated as an active SERS substrate. The active substrate was characterized by comprehensive techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), Scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), mapping, and X-ray photoelectron spectroscopy (XPS). The FHA was not only employed to detect ciprofloxacin (CIP) solution by SERS but also it was successfully applied for detection of CIP in fish body. It showed excellent linear relationship in the range of 1.0 × 10 −8 - 1.0 × 10 −3 mol/L for CIP, with low limit of detection (7.5 × 10 −9 mol/L), satisfactory enhancement factor, stability, and repeatability. A novel approach for detecting analyte in animal's body based on SERS was developed. It could be potential candidate to rapid detection of analyte for animal and it will open new perspective in application of SERS in vivo.
研究领域:
环境科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Yanfen Wang,Pengfei Jia,Jie Ai,Gangzheng Liu,Shuangshuang Liu,Juan Gao,Zhaoqi Sun
Novel Ag/ZnO composite nanoflowers (CNFs) had been designed as a surface-enhanced Raman scattering (SERS) substrate for organic molecule detection. Flower-like ZnO architecture was firstly synthesized by a low-temperature precipitation method, and subsequently Ag nanoparticles were decorated on ZnO nanoflowers through a photochemical reaction. The optimal Ag component was investigated by changing the photo-reduction time of Ag + in the ZnO precursor solution. It is found that the Ag nanoparticles with suitable size and crystallinity are significantly related to the light absorption and Raman signals for Ag/ZnO substrate. For Rhodamine 6G (R6G) as probe molecules, the optimal Ag/ZnO-40 min CNFs achieve a low detection limit of 1.0 × 10 −12 M and a high enhanced factor (EF) of 1.74 × 10 6 . Due to its excellent photocatalytic activity, the Ag/ZnO active substrate effectively degrades R6G molecules adsorbed on the surface, displaying an excellent self-cleaning property and stable recyclability. Such a superior SERS performance can be attributed to the synergy effect of two components (Ag nanoparticles and ZnO nanoflowers) such as its unique architecture, charge transfer and high-density hot spots.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Meisheng Zhang,Baofang Jin,Yan Liu,Wei Liu,Duan Weng,Xiaodong Wu,Shuang Liu
In this work, O 3 activation was performed at 200 °C over two types of Ag/CeO 2 catalysts with nanocube- and nanorod-like morphologies, respectively. The O 3 -indcued surface O x − species (“O x − injection”) accelerated soot combustion over both catalysts temporarily. In contrast, the depletion of CeO 2 surface oxygen vacancies (Ce 3+ -V O-s ) caused by ozonization conferred to long-term activation. Specifically, the ozonized nanocubic Ag/CeO 2 with low initial Ce 3+ content not only benefited more from the “O x − injection”, but also exhibited good redox stability and high practical potential. Therefore, the combination of this catalyst with O 3 activation may result in efficient soot elimination in the particulate filters of vehicles.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 12
·1-10
·
IF 2.8
Zheng Haoran,Yu Shihui,Bai Jinke
A scalable strategy is proposed for preparing ultra-flexible transparent heaters (THs) with ZnO-Ag core–shell nanowires (ZnO@Ag NWs) embedded in polyvinylidene fluoride composite films. The obtained THs exhibit a high average transmittance of 85.8% in the visible spectral range and excellent heating performance. The maximum saturation temperature can reach 153 °C within 10 s at an input voltage of 4.0 V. Furthermore, the saturation temperature of THs has not changed significantly after 1000 bending cycles with a curvature radius of 0.5 mm, demonstrating excellent mechanical flexibility. In particular, the THs possess environmental endurance, and no significant deterioration in performance can be found after exposure to high humidity (relative humidity: 85%) and ultraviolet ozone (254 and 185 nm) irradiation for 10 h, which is attributed to the protective role provided by the covering of ZnO shells on the Ag NWs. These outstanding parameters make the fabricated THs to be promising for application in wearable systems, medical thermotherapy pads and industrial defrosters.
研究领域:
材料科学
·
纳米技术
·
柔性电子
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）