CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Taoyun Zhou,Yun Cheng,Shilin Li,Yi Liu,Xinyu Li
Photoelectrochemical (PEC) water splitting offers a sustainable pathway for hydrogen production, however, the practical application of bismuth vanadate (BiVO 4 ) photoanodes is severely limited by inefficient charge separation and sluggish surface reaction kinetics.To address these challenges, this work aims to develop a simple, scalable, and interface-engineered strategy to enhance the PEC activity of BiVO 4 photoanodes. Herein, Ag-modified BiVO 4 photoanodes were prepared via a scalable two-step electrodeposition followed by photodeposition process, enabling controllable Ag loading and robust interfacial contact. The introduction of Ag nanoparticles not only enhances visible-light absorption through plasmonic effects, but also promotes charge separation by acting as effective electron sinks at the BiVO 4 /Ag interface. As a result, the optimized BiVO 4 /Ag-2 electrode delivers a photocurrent density of 1.24 mA·cm -2 at 1.23 V vs. RHE, which is 2.6 times higher than that of pristine BiVO 4 , along with a surface charge injection efficiency of 35.9%. Moreover, the electrode retains 80.3% of its initial photocurrent after 3 h of continuous operation without sacrificial agents, demonstrating improved operational stability. These findings highlight the synergistic effects of scalable fabrication, controlled Ag decoration, and plasmon-assisted charge transfer regulation, providing a practical and manufacturable design strategy for advancing BiVO 4 -based photoanodes toward efficient solar-driven water splitting.
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Nanoscale
·
2026
·
IF 5.1
Qi Chen,Yanming Li,Hui Shi,Wenbin Ma,Chunzhen Yang,Changli Li,Jingfu He
Multi-carbon (C2+ ) products from electrocatalytic CO2 reduction (CO2 RR) hold significant industrial value. Tandem Cu-based catalytic systems can markedly improve C2+ selectivity, but their performance is often limited by suboptimal spatial configurations. In this study, we fabricate layer-stacked Ag/CuO and array-patterned Ag/CuO catalysts with tunable array spacings (200, 400, and 800 μm) to decouple CO generation and consumption, thereby enabling precise regulation of * CO flux. The array-patterned Ag/CuO systems markedly outperform layer-stacked designs, indicating that lateral CO diffusion is more effective than longitudinal diffusion.Moreover, C 2+ selectivity strongly depends on array spacing, with the best performance achieved at 400 μm (Ag-CuO-400), reaching a Faradaic efficiency (FE) of 63% for ethylene at 300 mA/cm 2 in a neutral electrolyte. Through operando infrared microscopy, we visualize the * CO coverage distribution in real time, revealing an effective lateral CO diffusion length of approximately 200 μm. This corresponds to an optimal balance between * CO supply and C-C coupling activity on the Ag-CuO-400 catalyst. This work underscores the significance of anisotropic * CO transport and provides a design strategy for spatially structured tandem catalysts.
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WATER SCIENCE AND TECHNOLOGY
·
2015
·Vol. 71
·期 11
·1679-1685
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IF 1.106
Hu Xuefeng,Wang Xiaowen,Dong Liuliu,Chang Fei,Luo Yongming
Ag speciation in a chloride medium was dependent upon the Cl/Ag ratio after releasing into surface water. In this study, the photoreaction of in situ formed Ag–Cl species and their effects on aniline photochlorination were systematically investigated. Our results suggested that formation of chloroaniline was strongly relevant to the Cl/Ag ratio and could be interpreted using the thermodynamically expected speciation of Ag in the presence of Cl − . AgCl was the main species responsible for the photochlorination of aniline. Both photoinduced hole and •OH drove the oxidation of Cl − to radical •Cl, which promoted the chlorination of aniline. Ag 0 formation was observed from the surface plasmon resonance absorption during AgCl photoreaction. This study revealed that Ag + released into Cl − -containing water may result in the formation of chlorinated intermediates of organic compounds under solar light irradiation.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2026
·
IF 2.6
Bian Meihua,He Yuyin,Deng Shanquan,Zhu Junwei,Peng Jianing
To overcome the inherent limitations of Ag–SnO 2 electrical contact materials, this study employed a combined strategy of In 2 O 3 doping and hot pressing sintering, establishing a direct interrelationship among material composition, microstructural evolution, electrical conductivity, and microstrain. Four Ag–SnO 2 –In 2 O 3 powder compositions were synthesized, and the effects of conventional sintering versus hot pressing sintering on microstructure and functional properties were systematically investigated. Results show that hot pressing sintering enables near-complete densification (99% relative density) and significantly improves hardness by 42.5% (57.3HV), primarily by suppressing interfacial porosity and refining microstructural uniformity. Optimal In 2 O 3 addition (4 wt%) not only facilitates homogeneous phase distribution but also minimizes bulk resistivity (2.52 × 10 −6 O·cm), leading to the highest electrical conductivity (3.98 × 10 5 S/cm). Rietveld refinement reveals a pronounced reduction in microstrain (0.01% for In 2 O 3 , 1.7% for SnO 2 ) in the best-performing samples, directly linking lattice relaxation and phase stability to enhanced electron mobility. This mechanistic insight provides a foundation for the rational design and optimization of advanced Ag-based electrical contact materials.
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Huaqi Chai,Junsheng Wang,Yuanhai Lin,Yuncong Wang,Bingjie Chai,Mingming Xu
The fabrication of surface-enhanced Raman scattering (SERS) substrates with high hotspot density and superior sensitivity is a critical bottleneck limiting their practical applications. In this paper, a three-dimensional (3D) SERS substrate based on high-density Cu@Ag bimetallic heterostructured nanoflowers (Cu@Ag NF) was constructed using citric acid etching-assisted electrochemical deposition (ED) technology and high-vacuum electron beam evaporation coating technology, which provides an efficient and low-cost preparation process for the SERS substrate. The performance of a Cu@Ag 3D-SERS substrate was evaluated systematically using crystal violet (CV) as the probe molecule. This substrate exhibited a limit of detection (LOD) as low as 10–12 M (pM), and the signal intensities at its five characteristic peaks were more than 10 times higher than those of the Ag@ITO substrate, indicating its high sensitivity. In addition, the substrate demonstrated excellent uniformity (relative standard deviation (RSDs) < 11% for 15 randomly tested points) and long-term stability (no significant signal attenuation after 2 weeks of storage at room temperature). This work provides valuable guidance for the facile, scalable, and low-cost fabrication of high-performance SERS substrates, and presents a reliable strategy for the detection of trace organic pollutants in practical scenarios.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2026
·
IF 7.9
Songting Jiang,Chenghao Zhang,Chun Li,Xiaoqing Si,Zongjing He,Lin Cao,Chengxian Li,Shisheng Huang,Jun Wang,Yang Liu,Jian Cao
In this work, Ti 3 AlC 2 ceramics were joined by reactive air brazing using Ag–CuO fillers. The Ag–4CuO filler showed the best wettability, with a minimum contact angle of 13.1°. Continuous and dense brazed seams were formed at 1000 °C-1100 °C. The joint interface consisted of an Ag–rich brazed seam and a TiO 2 /α-Al 2 O 3 layered reaction zone. Increasing brazing temperature, the reaction layer evolved from TiO 2 –dominated products with limited Al 2 O 3 to a TiO 2 /Al 2 O 3 /TiO 2 trilayer structure, whereas increasing CuO content thickened the oxide reaction layer. The maximum shear strength reached 72.2 MPa at 1050 °C for 30 min with 4 mol.% CuO. Fracture was dominated by brittle features, with fracture regions varying with the reaction-layer structure. These results provide experimental guidance for reactive air brazing of Ti 3 AlC 2 ceramics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Junnan Liu,Qiuyang Luo,Shu Xia,Xingfu Yang,Jie Lei,Qi Sun,Xiaohu Chen,Jiaojing Shao,Xiaoning Tang,Guangmin Zhou
Structuring a stable artificial coating to mitigate dendrite growth and side reactions is an effective strategy for protecting the Zn metal anode. Herein, a Cu-Ag double-layer metal coating is constructed on the Zn anode (Zn@Cu-Ag) by simple and in-situ displacement reactions. The Cu layer enhances the bond between the Ag layer and Zn substrate by acting as an intermediary, preventing the Ag coating from detachment. Concurrently, the Ag layer serves to improve the corrosion resistance of Cu metal. During plating, the initial Cu sheets and Ag particles on the surface of Zn@Cu-Ag electrode gradually transform into a flat and smooth layer, resulting in the formation of AgZn, AgZn 3 , and (Ag, Cu)Zn 4 alloys. Alloys play a multifunctional role in inhibiting dendrite growth and side reactions due to decreased resistance, low nucleation barrier, enhanced zincophilicity, and strong corrosion resistance. Consequently, the Zn@Cu-Ag symmetric cell exhibits continuous stable performance for 3750 h at 1 mA cm −2 . Furthermore, the Zn@Cu-Ag||Zn 3 V 3 O 8 full cell achieves an initial capacity of 293.4 mAh g −1 and realizes long cycling stability over 1200 cycles. This work provides new insight into the engineering of an efficient artificial interface for highly stable and reversible Zn metal anodes.
研究领域:
材料科学
·
电化学
·
储能
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 46
·31754-31769
·
IF 3.3
Wenhao Pan,Changjiang Yang,Lei Zhou,Xiaolan Cai,Yankun Wang,Junhao Tan,Jun Chang
This study aimed to address the challenges associated with silicon (Si) anode materials in Li-ion batteries, such as their large volume effect and poor electrical conductivity. To overcome these limitations, a novel composite microsphere called pSi/Ag was developed using quartz waste through a combination of high-energy ball-milling, spray drying, and magnesiothermic reduction techniques. The morphology and structure of the pSi/Ag composite were thoroughly characterized using various methods, including X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The results revealed that the Ag nanoparticles were uniformly dispersed within the porous micron-sized Si sphere particles, leading to enhanced electrochemical performance compared to pure porous silicon that did not undergo the spray drying process. The use of micron-sized Si prevented the excessive formation of the solid electrolyte interphase film, and the pSi/Ag-5 anode, prepared with 5 wt% AgNO3 as a precursor, demonstrated an impressive initial Coulombic efficiency of 92.8%. Moreover, a high specific capacity of 1251.4 mA h g−1 over 300 cycles at a current density of 4000 mA g−1 was attributed to the improved conductivity provided by the Ag nanoparticles in the Si matrix. The straightforward synthesis method employed in this study to produce pSi/Ag presents a promising approach for the future development of high-performance silicon anodes in Li-ion batteries.
研究领域:
材料科学
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储能
·
纳米技术
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电化学
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电池技术
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Lin Xing,Xiaoyu Zheng,Yulian Tang,Xuemei Zhou,Junkai Hao,Lei Hu,Jinglin Shen,Zhengquan Yan
To strengthen the properties of nanozymes, a Ag-β-cyclodextrin-graphene oxide ternary nanocomposite (Ag-β-CD-GO) was developed first by a homogeneous redox-active self-assembly method. Taking advantage of the excellent environmental compatibility, high surface areas, and strong hydrogen-bonding ability of β-cyclodextrin and graphene oxide, the proposed Ag-β-CD-GO exhibited superior peroxidase-mimicking activity, high stability, and nontoxicity as well. It could accelerate the oxidation–reduction reaction of the common colorimetric substrate 3,3′,5,5′-tetramethylbenzidine (TMB) and the oxidant H2O2 with Michaelis constants (Km)/maximal reaction rates (Vmax) of 3.3 mmol·L–1/2.45 × 10–8 mol·L–1·s–1 and 0.13 mmol·L–1/2.52 × 10–8 mol·L–1·s–1, respectively. Interestingly, toxic Hg2+ could decrease the characteristic UV–vis absorbance at 653 nm of the Ag-β-CD-GO-TMB-H2O2 system exclusively with an obvious color change from blue to colorless, expressing a visual hypochromic effect. Under the optimal testing conditions (pH 4.0, 180 μL of 1.5 mmol·L–1 TMB, 180 μL of 1.0 mol·L–1 H2O2, incubation for 20 min at 25 °C), the target Ag-β-CD-GO-TMB-H2O2 was efficiently utilized for visual monitoring of toxic Hg2+ in natural water, drink, and fruit juice samples with quite a low detection limit, i.e., 8.3 × 10–10 mol·L–1 (S/N = 3), far below the 3.0 × 10–8 mol·L–1 permitted in drinking water by the World Health Organization (WHO). The synergetic enhancement peroxidase-mimicking activity of Ag-β-CD-GO and the exclusive recognition mechanism to Hg2+ were further investigated in detail.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Jinping Tang,Fuqiang Qian,Yuhai Wang,Chunxu Wang,Yuan Chai,Dewen Kong,Jin Wang
By integrating the photonic nanojet effect of polystyrene microsphere (PS), the charge transfer capability of MXene nanosheets, and the electromagnetic field enhancement induced by Ag nanoparticles, the PS@MXene@Ag composite substrate exhibited outstanding SERS sensitivity. • The SERS performance of the PS@MXene@Ag substrate was evaluated using 2-mercaptopyridine as a probe molecule, achieving a detection limit as low as 1.24 × 10 −12 M, with the SERS performance factor (SPF) up to 5.0 × 10(Gueguen et al., 2000 [7] ) . In addition, the SERS substrate demonstrated satisfactory results in signal uniformity, batch-to-batch reproducibility, and long-term stability. • PS@MXene@Ag composite successfully detected thiram and methyl blue on practical sample surfaces (orange and fish), achieving satisfactory recovery rates. Surface-enhanced Raman scattering (SERS) spectroscopy has emerged as a powerful analytical technique for the sensitive detection of hazardous molecules, owing to its ultranarrow spectral linewidths and highly specific molecular fingerprinting capability. Herein, we designed a reliable SERS substrate consisting of polystyrene microspheres (PS), Ti 3 C 2 T x MXene nanosheets, and Ag nanoparticles (NPs) for the sensitive detection of various organic pollutants. By integrating the photonic nanojet effect of PS, the charge transfer capability of MXene nanosheets, and the electromagnetic field enhancement induced by Ag NPs, the PS@MXene@Ag composite substrate exhibited outstanding SERS sensitivity, along with excellent reproducibility and signal uniformity. As a result, the limit of detection (LOD) for 2-mercaptopyridine (2-Mpy) was as low as 1.24 × 10 −12 M, with the SERS performance factor (SPF) of up to 5.0 × 10 7 . Moreover, the SERS substrate maintained good stability after storage for four weeks. In addition, the PS@MXene@Ag composite was successfully applied to the detection of other organic pollutants, including thiram and methylene blue (MB). The calibration results revealed a good linear relationship between the logarithm of concentration and the corresponding SERS intensity, with correlation coefficients (R 2 ) of 0.99 and 0.98, respectively. The LODs for thiram and MB were calculated to be 1.96 × 10 −10 M and 2.33 × 10 −10 M, respectively, and satisfactory recovery rates were obtained in practical sample analyses (orange peel and fish skin). These results demonstrate that the fabricated PS@MXene@Ag SERS substrate has promising potential for the detection of organic molecular pollutants. Download: Download high-res image (129KB) Download: Download full-size image PS@MXene@Ag as a SERS-active substrate for the detection of organic pollutants.
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Journal of Environmental Sciences
·
2023
·
IF 6.9
Jiaojiao Guan,Daorong Li,Jiahui Feng,Peng Xu,Zhaonian Li,Siqi Ge,Hongxia Chen,Kunfeng Zhang
The removal of ammonia (NH 3 ) emitted from agricultural and industrial activities is of great significance to protect human health and ecological environment. Photocatalytic NH 3 oxidation to N 2 under mild conditions is a promising strategy. However, developing visible light photocatalysts for NH 3 oxidation is still in its infancy. Here, we fabricate N-TiO 2 and Ag/AgCl/N-TiO 2 photocatalysts by sol-gel and photodeposition methods, respectively. The introduction of N not only endows TiO 2 with visible light response (absorption edge at 460 nm) but also results in the formation of heterophase junction (anatase and rutile). Thus, N-TiO 2 shows 2.0 and 1.8 times higher than those over anatase TiO 2 and commercial TiO 2 for NH 3 oxidation under full spectrum irradiation. Meanwhile, surface modification of Ag can simultaneously enhance visible light absorption (generating localized surface plasmon resonance effect) and charge separation efficiency. Therefore, the photocatalytic activity of Ag/AgCl/N-TiO 2 is further improved. Furthermore, the presence of N and Ag also enhances the selectivity of N 2 product owing to the change of reaction pathway. This work simultaneously regulates photocatalytic conversion efficiency and product selectivity, providing some guidance for developing highly efficient photocatalysts for NH 3 elimination.
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TALANTA
·
2023
·
IF 6.1
Jiaqi Liu,Zhongshun Wang,Ya'nan Meng,Chunning Chen,Qiye Chen,Yalei Wang,Shuzhen Dou,Xiaoyang Liu,Nan Lu
Trace analysis has great promise in the fields of disease diagnosis and environment protection. Surface-enhanced Raman scattering (SERS) has wide range of utilization due to its reliable fingerprint detection. However, the sensitivity of SERS still needs to be enhanced. Raman scattering of target molecules around hotspots, the area with extremely strong electromagnetic field , can be highly amplified. Therefore, to increase the density of hotspots is one of the major approaches for enhancing the detection sensitivity of target molecules. In this paper, an ordered array of Ag nanocubes was assembled on a thiol modified silicon substrate as a SERS substrate, which provided high-density hotspots. The detection sensitivity is demonstrated by the limit of detection, which is down to 10 −6 nM with Rhodamine 6G as probe molecule. The wide linear range (10 −7 –10 −13 M) and low relative standard deviation (<6.48%) indicate the good reproducibility of the substrate. Furthermore, the substrate can be used for the detection of dye molecules in lake water. This method provides an approach for increasing hotspots of SERS substrate, which could be a promising method to achieve good reproducibility and high sensitivity.
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