ACS Catalysis
·
2025
·
IF 13.1
Weina Yang,Yachao Wang,Yaxiong Wei,Guofeng Zhao,Weixin Huang,Cong Fu
Photocatalytic oxidative coupling of methane (OCM) offers a sustainable pathway for direct conversion of methane into value-added hydrocarbons, yet faces persistent challenges in balancing efficient methane activation with suppression of overoxidation. Here, we present a TiO2-based photocatalyst decorated with highly dispersed Ag–Co dual sites that achieves superior performance in continuous-flow OCM. The optimized AgCo–TiO2 system demonstrates a remarkable C2 hydrocarbon production rate of 1.7 mmol g–1 h–1 with 91% selectivity while maintaining stable operation for over 30 h. In situ spectroscopic analyses indicate that the introduced Co species induce mobile-charge imbalances, driving the directional transfer of photogenerated electrons and effectively suppressing electron–hole recombination. Coupled with Ag serving as a catalytic center, these effects synergistically enhance O2 activation, C–H bond cleavage, and selective C–C coupling, thereby contributing to the superior catalytic performance. This work provides valuable mechanistic insights into the photocatalytic OCM process, highlighting the pivotal role of precisely engineered charge transfer pathways in enabling efficient methane-to-C2 conversion.
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Analytical Methods
·
2024
·
IF 2.7
Kang Shen,Caili Bi,Haifan Yang,Miaowen Xu,Lili Huang,Youwei Wang
Based on the coordination principle of Lewis acid, the 4-mercaptophenylboronic acid (4-MPBA)-modified novel dumbbell-shaped Au-Ag nanorods (4-MPBA@DS Au-AgNRs) substrate has been developed, which could be combined with the surface-enhanced Raman scattering (SERS) technique to detect SO42- with high sensitivity and specificity. DS Au-AgNRs synthesized in this paper with dumbbell particular structure have been verified by finite-difference time domain (FDTD) simulation to be capable of stimulating strong localized electromagnetic enhancement (EM) at nano-edge, gap, generating a large number of “hot spots” exhibiting excellent SERS performance. The 4-MPBA modified on its surface could specifically recognize SO42-, producing a change in the spectral peak at 1382 cm-1, thus realizing highly sensitive and specific sensing of SO42-. Under optimized conditions, this SERS sensor responded rapidly to SO42- within 2 minutes and demonstrated uncommon immunity. Ratio calculation by the ratio of the characteristic peaks at 1382 and 1070 cm-1 (I1382/I1070) enabled quantitative detection of SO42- in the range of 1 × 10-8-1 × 10-3 M, and the detection threshold was as low as 1 nM, which was superior to that of similar detection methods. Importantly, the utility and reliability of this SERS substrate for the determination of SO42- in actual samples were evaluated using ion chromatography as the gold standard, and there was no significant difference between the two protocols (P > 0.05), and the RSD was less than 6% with a satisfactory recovery rate (97.6-102.3%). Therefore, the present protocol has the advantages of simplicity and rapidity, high sensitivity, specificity, stability, and practicability in the determination of SO42- in aqueous solution, providing a reliable solution for tracing SO42- in the field of food safety and environmental testing.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xianbin Xu,Difei Xiao,Yugang Gao,Wenbo Li,Miaomiao Gao,Shuang Zhao,Zeyan Wang,Zhaoke Zheng,Peng Wang,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
Electrocatalytic CO2 reduction reaction (CO2RR) to high value-added products, such as ethylene (C2H4), offers a promising approach to achieve carbon neutrality. Although recent studies have reported that a tandem catalyst (for example, Cu–Ag systems) exhibits advantage in C2H4 production, its practical application is largely inhibited by the following: (1) a traditional tandem catalyst cannot effectively stabilize the *CO intermediate, resulting in sluggish C–C coupling, and (2) inadequate H2O activation ability hinders the hydrogenation of intermediates. To break through the above bottleneck, herein, palladium (Pd) was introduced into Cu2O–Ag, a typical conventional tandem catalyst, to construct a Cu2O–Pd–Ag ternary catalyst. Extensive experiment and density functional theory calculation prove that Pd can efficiently stabilize the *CO intermediate and promote the H2O activation, which contributes to the C–C coupling and intermediate hydrogenation, the key steps in the conversion of CO2 to C2H4. Beneficial to the efficient synergy of Cu2O, Pd, and Ag, the optimal Cu2O–Pd–Ag ternary catalyst achieves CO2RR toward C2H4 with a faradaic efficiency of 63.2% at −1.2 VRHE, which is higher than that achieved by Cu2O–Ag and most of other reported catalysts. This work is a fruitful exploration of a rare ternary catalyst, providing a new route for constructing an efficient CO2RR electrocatalyst.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Jiaxin Liu,Jia Zheng,Yunshu Lu,Zhongmin Feng,Siqi Zhang,Ting Sun
17β-E 2 is used in animal growth regulation and agricultural fertilizer, and even ng L −1 mass concentration levels can show biological effects. In this work, Ag NPs was used as surface-enhanced Raman spectroscopy (SERS) source and WS 2 was synthesized by a simple method to provide a uniform distribution platform for Ag NPs. The MIP was the shell, which can selectively enrich the target molecule, pull the distance between the target molecule and SERS source, and protect Ag NPs. A cyclable SERS substrate with high sensitivity for detecting 17β-E 2 in food was constructed. The optimized WS 2 /Ag@MIP as SERS substrate has the advantages of high Enhanced Factor (EF = 2.78 × 10 9 ), low detection limit (LOD = 0. 0958 pM), strong anti-interference ability, and good recycling performance. Moreover, the detection of 17β-E 2 in real samples still has good accuracy. This work provides a new possibility for the trace detection of 17β-E 2 in food.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3573-3584
·
IF 3.5
Xu Man,Luo Yongping,Zeng Linsheng,Huang Ping,Xu Shunjian,Liu Yike,Wang Yongya,Li Xianchang,xie Yu
In consideration of the increased activity of Pt-based catalysts for methanol oxidation in direct methanol fuel cells, it is necessary to apply an ideal support in the construction of Pt-based catalyst for methanol oxidation. In this study, Ag/g-C 3 N 4 nanosheets (Ag/GCNN) nanocomposites with different Ag contents were synthesized and used as the progressive support to construct Pt/Ag/GCNN catalyst. As a nitrogen-rich polymeric semiconductor, GCNN is easily coordinated with various metals. The introduction of Ag nanoparticles can improve the electrical conductivity of the catalyst and cooperate with Pt for optimizing the performance of electrocatalytic oxidation of methanol. The electrochemical experiment results demonstrated that Pt/Ag/GCNN has higher electrocatalytic activity and stability for methanol oxidation than Pt/GC and Pt/GCNN. The mass activity of Pt/Ag/GCNN-0.6 (18.66 mA mg Pt −1 ) is 7.07, 4.60 and 1.26 times that of Pt/GCNN (4.06 mA mg Pt −1 ), Pt/Ag/GCNN-0.4 (4.06 mA mg Pt −1 ) and Pt/Ag/GCNN-0.8 (14.76 mA mg Pt −1 ) at the forward peak potential. The J f / J b ratio of Pt/Ag/GCNN-0.6 is 3.31, which is bigger than that of Pt/GCCN (2.62), Pt/Ag/GCNN-0.4 (2.69), and Pt/Ag/GCNN-0.8 (2.56). A suitable mechanism was proposed to explain that Ag/GCNN supported Pt catalyst can improve the CO toxicity resistance and electrocatalytic performance. Based on the coordination of GCNN, Ag was first modified to form a support, and then the remaining coordination sites were used to support Pt. It provided a new strategy for the design of catalysts for methanol electrooxidation. Graphical abstract
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Food Analytical Methods
·
2024
·Vol. 17
·期 4
·585-593
·
IF 2.6
Wang Haoyu,Zhang Li,Chen Chen,Waterhouse Geoffrey I. N.,Sun Yufeng,Xu Zhixiang
In this study, a sensitive surface-enhanced Raman scattering (SERS) sensor based on core–shell-structured Au@Ag nanoparticles (NPs) was successfully developed for the detection of acrylamide (AA) in foods. Coating Au NPs with a shell of silver gave the Au@Ag NPs outstanding SERS performance for AA detection. Under the optimal experimental conditions, a good linear relationship was established SERS intensity at 1272 cm −1 and the logarithm of the AA concentration (over the concentration range 10 −8 ‒10 −3 mol L −1 ). The limit of detection (LOD) of the SERS method was 1.27 × 10 −9 mol L −1 . The recoveries of AA in spiked cookie samples were in the range of 85.68–102.50%. In addition, the SERS sensor was used to determine the content of AA in three food samples (potato chips, fried dough twist, and instant coffee), with the results obtained being consistent with those determined by high-performance liquid chromatography (HPLC), demonstrating that the SERS sensor was suitable for the detection of AA in real food samples.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Chen Xu,Zhou Donglei,Xu Wen,Zhu Jinyang,Pan Gencai,Yin Ze,Wang He,Zhu Yongsheng,Shaobo Cui,Song Hongwei
Localized electric filed enhancement by surface plasmon resonance (SPR) of noble metal nanoparticles is an effective method to amplify the upconversion luminescence (UCL) strength of upconversion nanoparticles (UCNPs), whereas the highly effective UCL enhancement of UCNPs in colloids has not been realized until now. Here, we designed and fabricated the colloidal Au-Ag nanocage@NaYF 4 @NaYF 4 :Yb,Er core-shell hybrid with different intermediate thickness (NaYF 4 ) and tunable SPR peaks from visible wavelength region to NIR region. After the optimization of the intermediate spacer thickness (~7.5 nm) of NaYF 4 NPs and the SPR peak (~950 nm) of noble metal nanoparticles, an optimum enhancement as high as ~25 folds was obtained. Systematic investigation indicates that UCL enhancement mainly originates from the influence of the intermediate spacer and the coupling of Au-Ag nanocages with the excitation electromagnetic field of the UCNPs. Our findings may provide a new thinking on designing highly effective metal@UCNPs core-shell hybrid in colloids.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 25
·期 2
·683-688
·
IF 2.646
Yu Qizhi,Kong Xiangfa,Chen Chaoshu,Kang Caiyan,Meng Mianwu,Huang Siyu
An Ag nanoparticles (NPs) layer was synthesized on Ag sheet by alloying/electrochemical dealloying method: X-ray diffraction confirmed that the new Ag phase appeared after removing Ga from Ag-Ga alloy, and scanning electron microscopy examination showed that the prepared Ag layer had a NPS structure. The fine microstructure of silver resulted in significant SERS enhancement effect, while the NPs layer was used as the SERS substrate: when the prepared NPs layer was used as a SERS substrate to detect p-phenylenediamine (PPD), it exhibited a strong SERS peak at 1590 cm −1 . The result revealed that the intensity of SERS peaks was linear to the logarithm of PPD concentration in the range from 10 −16 mol L −1 to 10 −12 mol L −1 and the detection limit was 1.0 × 10 −17 mol L −1 .
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Bo Pang,Zhan Wu,Wenkui Zhang,Hui Huang,Yongping Gan,Yang Xia,Xinping He,Xinhui Xia,Jun Zhang
Agroydite Li 6 PS 5 Cl is one of the most promising solid electrolytes because of its high ionic conductivity and good processability. However, there are still many challenges with Li 6 PS 5 Cl and lithium anodes that prevent their industrialization, such as the growth of lithium dendrite and interfacial reactions. Interface modification of anodes has proven to be an effective method for solving these problems. Herein, we introduce Ag nanoparticles into the interface between Li 6 PS 5 Cl and metallic lithium and systematically investigate their interfacial properties . By incorporating silver nanoparticles , lithium dendrites can be depleted by forming Li–Ag alloys. Therefore, a denser and more stable interface between Li 6 PS 5 Cl and lithium metals is obtained. Benefiting from the above advantages, the Li/Li symmetrical battery with incorporated Ag nanoparticles exhibited an ultrahigh critical current density of up to 10 mA cm −2 and great cycling stability (more than 600 h). An all-solid-state battery with Ni-rich cathode and lithium metal anode demonstrates a high-capacity retention rate of 84% after 200 cycles at a current density of 0.5C. This study provides new insights into the construction of stable anode interfaces for the practical application of all-solid-state lithium batteries.
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Journal of Physical Chemistry C
·
2014
·
IF 4.835
Jing Wang,Weiqing Xu,Junjie Zhang,Shuping Xu
A kind of functional noble metal nanoparticles and metal/organic semiconductor composite nanomaterials, Ag nanoparticles (AgNPs, 6–10 nm in diameter) decorated small-sized Ag-tetracyano-p-tetrafluoroquinodimethane (AgTCNQF4) nanorods (150–400 nm in length and 60–100 nm in diameter), have been successfully synthesized through a rapid microemulsion reaction between TCNQF4 molecules and an AgNP colloid under a soft template of poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol). The morphology, chemical structure, and elemental composition of the prepared AgNPs–AgTCNQF4 composite nanorods were studied by transmission electron microscopy, selected-area electron diffraction, and X-ray photoelectron spectroscopy. The real-time ultraviolet–visible spectroscopy assisted with two-dimensional correlation spectroscopic analysis was employed to explore the growth of AgNPs–AgTCNQF4 composite nanorods in microemulsion. These composite nanorods display the photoinduced charge transfer (CT) property from the monoanion (TCNQF4–) to dianion (TCNQF42–) selectively under 532 nm light irradiation. The larger content of AgNPs on the surface of AgTCNQF4 led to the higher conversion of dianion due to the plasmon-assisted photocatalysis. This photoelectric composite material is promising for the applications of light-writing data storage and photocatalysis.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhanbo Wang,Depeng Gong,Zezhen Zhang,Shilong Gao,Chaocan Zhang
First reported liquid-phase synthesis of copper nanorods from a highly concentrated copper precursor under low-alkalinity and low structure-directing agent conditions. • A highly oxidation-resistant conductive ink was prepared by electroless plating and by using an organosilane-modified polyurethane as the continuous phase. • The resulting conductive ink enables stable performance in flexible electronics applications, including motion sensing, physiological monitoring, human-machine interfaces, wireless communication, and electromagnetic interference shielding. Functional conductive inks are foundational to flexible electronics and demand tight control over the oxidation resistance and conductivity of the metallic phase, together with the rheology, mechanical compliance and thermal stability of the continuous phase, to optimise printability and device performance. Morphology control of the conductive phase is also essential; however, scalable, low-cost and environmentally benign syntheses remain challenging. Here reporting a strategy that addresses these barriers. Polyether diamine (ED-2003) serves as a structure-directing agent under low-alkalinity, ice-bath conditions, enabling, for the first time, large-scale copper nanorod production from a high-concentration precursor system. A facile, contamination-free electroless silver-plating step forms Cu@Ag core-shell nanorods with excellent oxidative stability, while functional-group incorporation into the polymer backbone of the continuous phase concurrently improves flexibility, thermal robustness and nanorod dispersibility. The resulting ink delivers ultrahigh conductivity (386,093.33 S cm −1 at 19 wt% solids) and retains 383,192.56 S cm −1 after one year in air. It prints high-resolution, uniform conductive patterns on latex, (polyurethane) PU, cellulose and PET, and the printed films maintain nearly constant conductivity after 10,000 bending cycles, and printed traces are stretchable to 1000%. Collectively, these results highlight the broad applicability of the ink in flexible printed electronic products and establish a new paradigm for the scalable manufacture of high-performance, low-cost printed conductive inks for flexible electronics. Download: Download high-res image (270KB) Download: Download full-size image
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Journal of Energy Storage
·
2025
·
IF 9.8
Boyou Hu,Haiyang Li,Menglei Wang,Zhiqiang Rao,Liqing Hao,Xuan Yu,Meng Zhang
The development of high-performance aqueous zinc-ion batteries (AZIBs) is promising for energy storage applications, yet challenges persist due to excessive pseudo-capacitance, structural instability and low conductivity of cathode materials. In this study, an Ag-doped mesoporous δ-MnO 2 nanocomposite (Ag–MnO 2 ) was rationally designed as a high-specific-capacity cathode material for AZIBs. Intercalated Ag + stabilize the layered δ-MnO 2 framework and expand ion diffusion channels, while surface-anchored Ag nanoparticles enhance electrical conductivity, optimize pseudo-capacitance and enhance reaction kinetics of δ-MnO 2 . Electrochemical tests reveal that Ag–MnO 2 delivers an amazing specific capacity of 491.7 mAh g −1 , a high power density of 133.1 W kg −1 and a superb energy density of 660.0 Wh kg −1 at 0.1 A g −1 , significantly outperforming pristine δ-MnO 2 , an approximate power density of 135.6 W kg −1 and a poor energy density of 457.1 Wh kg −1 at 0.1 A g −1 . Furthermore, Ag–MnO 2 exhibits exceptional cycling stability, retaining 95.6 % capacity after 800 cycles at 1.0 A g −1 . Ex-situ X-ray diffraction and X-ray photoelectron spectroscopy analyses elucidate the energy storage mechanism of Ag–MnO 2 in AZIBs. A flexible pouch cell fabricated with Ag–MnO 2 demonstrates stable operation under bending conditions, which holds enormous potential in flexible battery applications, achieving high electrochemical performance of 470.3 mAh g −1 , 112.2 W kg −1 and 610.7 Wh kg −1 at 0.1 A g −1 . This work provides a scalable strategy for designing high-performance AZIBs cathodes and offers insights into material regulation for overcoming energy storage limitations, applicable to broader energy storage systems.
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