Journal of Energy Chemistry
·
2024
·
IF 14
Haotian Duan,Wenyang Li,Lixiu Ran,Fulong Zhu,Tianxiang Li,Ming Miao,Wen-jin Yin,Xin Wang,Yongzhu Fu
The conversion of carbon dioxide to ethylene by electrochemical reduction (CO 2 RR) provides a new strategy for achieving carbon dioxide conversion. However, copper-based catalysts have the disadvantages of unsatisfactory selectivity and low current density, which limit the potential CO 2 RR industrial expansion. Researches have verified that the real reaction sites at the catalyst surface often undergo reconstruction during the reaction, therefore, understanding and utilizing this phenomenon is crucial for improving catalytic performance. In this work, we introduced additional Ag component into Cu@Ag/C tandem catalyst by in-situ electrochemical reconstruction of Cu 2 CO 3 (OH) 2 /AgCl/C precursor. This electro-reduced catalyst exhibits a C 2 H 4 Faradaic efficiency of 50.41% in H-cell, and 58.03% in the flow cell, surpassing the counterparts of pure Cu and Ag, as well as the Cu-Ag homolog with separated interface. Moreover, it also provides a long-term stability of 21 h with the ethylene Faraday efficiency (FE) over 50%. The appropriate amount of Ag dopant into the Cu catalyst changes the electronic structure of Cu surface by the electron transfer from Cu to Ag, which distinctly enhances the binding energy of CO 2 on the catalyst. Meanwhile, in-situ Raman results and theoretical calculation reveal that the introduction of silver increases the number of active sites and improves the coverage of *CO intermediate, thereby accelerating the kinetics of C–C coupling and reducing its energy barrier. The combination of cascade catalytic strategy and in-situ electroreduction interface provides potential applications for future artificial carbon balance.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Shuang Wu,Ting-yu Zhu,Zhu Zeng,De-xiang Sun,Jing-hui Yang,Xiao-dong Qi,Yong Wang
As electronic devices become more integrated into daily life, concerns about electromagnetic radiation pollution become more severe, despite the increased portability they offer. Designing a lightweight and multifunctional material that is environmentally friendly, thermally conductive, and electromagnetically shielded is urgently needed. In this work, novel composites were fabricated by incorporating Ag@MXene hybrid particles into the wood-based aerogel. Compared with the aerogels containing only Ag nanoparticles (AgNPs) or MXene , the Ag@MXene/W aerogel exhibited more homogeneous dispersion of unfolded MXene nanosheets and more AgNPs but higher porosity (97.1 %) and smaller density (0.047 g cm −3 ). Consequently, the Ag@MXene/W aerogel exhibited high compressibility and low energy dissipation, remarkable strain sensitivity, impressive electrical conductivity (33.9 S m −1 ) and specific electromagnetic shielding efficiency (5765.96 dB cm 2 g −1 ), and high thermal conductivity (0.81 W m −1 K −1 ). The excellent comprehensive performances ensure that the aerogel has wide applications in various fields, including electromagnetic pollution protection, strain detecting, and thermal management, etc.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yanna Ding,Yanli Zhou,Cuilan Feng,Maotian Xu,Daosheng Liu
An in situ confinement polymerization technology was developed to construct nitrogen-doped carbon tubes (NCT) with a uniform distribution of silver nanoclusters (AgNCs). Specifically, polydopamine (PDA) was utilized as a good stabilizer and carbon precursor by using curcumin as a template to induce the self-polymerization of dopamine in the presence of Ag+. Then, the AgNC@NCT materials were formed by template removal and subsequent carbonization. The prepared AgNC@NCT materials exhibited excellent stability, catalytic activity, and electrochemical properties due to their high carbonization and silver content. The AgNC@NCT-modified electrode had strong catalytic oxidation activity, specific surface area, and charge transfer efficiency for the detection of d-tryptophan (d-Trp). The constructed electrochemical sensor demonstrated a good linear range (0.1–100 μM) with a low detection limit (0.009 μM) for d-Trp detection. The sensor also had excellent selectivity, high stability, and repeatability. More importantly, it could be used for the evaluation of d-Trp levels in human serum with high accuracy. This method provided a strategy for the detection of d-Trp in biological samples, which had a good application prospect in daily clinical tests.
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LANGMUIR
·
2025
·
IF 3.9
Xingtang Xu,Guang Sun,Xueling Wang,Yanwei Li,Jianliang Cao,Yan Wang,Hari Bala
Recently, the detection of acetone by using a gas sensor fabricated with metal oxide semiconductors has stimulated intense research enthusiasm, owing to its promising application in the noninvasive diagnosis of diabetes by monitoring human exhaled breath. In this work, a potential acetone sensor was fabricated by comodification of the nanosheets-assembled ZnCo2O4 hierarchical microspheres (HMSs) with MoO3 and Ag nanoparticles (NPs). The ZnCo2O4 HMSs were synthesized via a solvothermal route and then sequentially modified with MoO3 and Ag NPs via immersion, calcination, and photoreduction routes. The results of gas sensing measurement indicated that after modification with MoO3 and Ag, a continuous improvement of acetone sensitivity was realized on the ZnCo2O4 sensor. At the optimal working temperature of 260 °C, the response of the best Ag/MoO3/ZnCo2O4 sensor to 50 ppm of acetone was 7.23, which was about 3.3 and 1.4 times higher than that of ZnCo2O4 and MoO3/ZnCo2O4, respectively. Apart from the higher response, the selectivity and response speed of the Ag/MoO3/ZnCo2O4 sensor were also improved. The results of density functional theory calculations showed that the enhanced absorbability of ZnCo2O4 for acetone after modification with MoO3 and Ag should be responsible for the improved acetone sensitivity and selectivity of the Ag/MoO3/ZnCo2O4 sensor.
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ChemistryOpen
·
2024
·
IF 2.5
Dam Xuan Thang,Nguyen Thuy Chinh,Nguyen Thi Binh Minh,Trinh Hoang Nghia,Thai Hoang
Graphical This study focuses on a green synthesis of Cu 2 O and Cu 2 O−Ag particles using ascorbic acid (LAA) as a reducing agent in the presence of two surfactants, polyethylene glycol 6000 and sodium dodecyl sulfate. The hybrid materials exhibit strongly antibacterial activity and are potential for the application in the acrylic emulsion coating. Nanomaterials based on metal oxides, especially Cu 2 O, have received much attention in recent years due to the many unique properties of the surface plasmon resonance they provide. The report presented the co-precipitation method, a simple preparation method to produce Cu 2 O oxide particles. In addition, to improve the unique antibacterial properties of Cu 2 O, a proposed method is to attach Ag nanoparticles to the surface of Cu 2 O particles. The Cu 2 O and Cu 2 O−Ag particles were synthesized based on redox reactions using ascorbic acid (LAA) as a reducing agent. Moreover, in this experiment, two surfactants, polyethylene glycol 6000 (PEG 6000) and sodium dodecyl sulfate (SDS), were added during the manufacturing process to create particle samples and particle combinations with better properties than the original sample. Changes in the characteristics and properties of particle samples are determined by many different physical and chemical methods such as ultraviolet-visible spectroscopy (UV-Vis), infrared spectroscopy (IR), noise X-ray radiation (XRD), scanning electron microscope (SEM), dynamic light scattering (DLS), energy dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). Finally, the activity against bacteria, including E. coli and S. aureus , was also tested using the agar well diffusion method to determine the zone of inhibition. The results improved the particle size value, which decreased by half to 200 nm when two additional surfactants, PEG and SDS, were added. In addition, the antibacterial ability has also been shown to increase significantly when the diameter of the bacterial inhibition zone increased significantly, reaching values of 20 mm (Cu 2 O/Ag/SDS) and 32 mm (Cu 2 O/Ag/PEG) for the E. coli bacterial strain. The initial test sample was only about 14 mm in size. The S. aureus bacterial strain also had a similar improvement trend after adding Ag to the Cu 2 O surface with the appearance of two surfactants, SDS and PEG. The inhibition zone diameter values reached the optimal value at 36 mm in the Cu 2 O/Ag/PEG particle combination sample compared to only the initial 26 mm in the Cu 2 O particle sample. Finally, the particle samples are added to the acrylic emulsion paint film to evaluate the changes. Positive results were obtained, such as improvement in adhesion (1.22 MPa), relative hardness (240/425), and sand drop resistance (100 L/mil) in the Cu 2 O/Ag/PEG particle combination sample, which showed the correctness and accuracy of the research.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Jie Yu,Dan Zhu,Cong Qi,Wenjie Zhang,Lin Liang
To improve the ability of the medium to capture solar energy, Ag@Fe 3 O 4 core-shell nanoparticles (NPs) were prepared in this paper. The influences of different preparation conditions on the particle structure and photo-thermal properties were investigated, and the growth and spectral absorption properties of Ag@Fe 3 O 4 NPs were analyzed. At the same time, nanoparticles-modified carbon membranes (NPCMs) were prepared by electrostatic adsorption method. The influences of radiation intensity and preparation concentration on photo-thermal properties were investigated, and the local evaporation mechanism of NPCMs was deeply explored. Experiments showed that changing the molar ratio of the precursor can effectively regulate the structure and optical properties of the NPs. The increase of the core radius of the NPs will increase the electric field strength ( E ) of the core surface and promote the absorption of light. Optimizing the temperature and heating time of the preparation process is very important for the successful realization of Fe 3 O 4 coated Ag, while deepening the coupling between plasmons on the surface of adjacent NPs. Compared with the intensity of 5 sun, the evaporation efficiency at 2 sun is increased by 13.37%. The local evaporation effect caused by NPCMs makes the system still have good evaporation efficiency at low radiation intensity.
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JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 8
·
IF 2.7
Xu Xiaoli,Jiang Hongtao,Liu Wangwang,Wang Shengyi,Wang Xiaoping,Wang Mengyu,Ma Wei,Ma Shuyi,Wei Jinsha
It is a novel-effective process for realizing high-efficiency sensing and continuous gas monitoring by introducing precious metals into metal–oxide–semiconductors (MOSs). In this study, Ag is exploited to prepare surface functionalized SnO 2 nanoparticles (NPs) and innovative x Ag@SnO 2 /CsPbBr 3 , activating and catalyzing the gas sensing reactions on semiconductors. The results show that the precious metal Ag NPs promote the directional transport of carriers, thus improving the gas sensing performances. In addition, innovative x Ag@SnO 2 /CsPbBr 3 composites originated from Ag@SnO 2 NPs and 3-mercaptopropionic acid treated all-inorganic perovskite CsPbBr 3 are constructed to further accelerate electron transfer on heterointerfaces, enabling continuous and efficient monitoring of ethanolamine (EA) at room temperature. The sensing properties of Ag@SnO 2 /CsPbBr 3 on various volatile organic compounds are investigated. Compared with pure CsPbBr 3 , the EA response of as-prepared 2Ag@SnO 2 /CsPbBr 3 is obviously improved by about sevenfold. The response/recovery time is greatly shortened, besides the good stability. Another interesting result for x Ag@SnO 2 /CsPbBr 3 is the lower limit of detection of 44.43 ppb. The work demonstrates that Ag modification facilitates the adsorption/desorption rate and the response. Furthermore, the catalytic activation of noble metal Ag NPs and the synergistic interaction of SnO 2 /CsPbBr 3 nano-heterojunctions promote EA sensing performances at room temperature.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Jianhao Li,Zhicheng Hu,Shuhuan Han,Dapeng Cao,Xiaofei Zeng,Jianfeng Chen
Electrocatalytic CO 2 reduction reaction (CO 2 RR) to multi-carbon product, especially for ethylene (C 2 H 4 ), provides a favorable pathway for carbon neutrality and renewable energy storage. However, the second-order C-C coupling reactions in CO 2 RR need always the high activation/driven energy in dynamics originating from the trace C 1 intermediate product. Herein, we synthesized the Ag-decorated Cu 2 O porous hollow core-shell catalyst named Ag@Cu 2 O where Ag nanoparticles uniformly distributed on inner the surface of the hollow Cu 2 O (H-Cu 2 O) via the sacrificial template method. Benefiting from the synergistic hollow structure and electron transfer from Cu and Ag to O, Ag@Cu 2 O catalyst delivers the excellent C 2 H 4 Faradaic Efficiency (FE) of 55 % ± 2 % at −1.0 V (vs. RHE), which is superior to the most reported catalysts. More importantly, in situ infrared spectroscopy and density functional theory (DFT) calculations reveal the introduction of Ag can decrease the activation energy required for *CO and C-C coupling.
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TALANTA
·
2024
·
IF 5.6
Cuiyun Kou,Haiguo Hu,Ying Tang,Yiyu Luo,Chenggong Han,Yu Bao,Zhinan Guo,Li Niu
Ag + , as a good bactericidal reagent, has been extensively used to prevent the growth and spread of bacteria and viruses. However, overcommit of Ag + would leave residues in environments, which is toxic to the human body even under minimal exposure. In this case, a fast and high selective sensing method based on field effect transistors (FET) has been proposed for monitoring Ag + in aqueous solutions. Through coordination interaction, Ag + could be spontaneously adsorbed on the surface of the sensing material MoS 2 and affect its electronic carrier transport behavior. The MoS 2 -based FET sensor show outstanding sensing performance to Ag + including short response time (60 s), good linear relationship (R 2 = 0.97), low detection limit (10 −10 mol/L) and high selectivity, which could meet the permissible criterion of Ag + in drinking water by the World Health Organization (0.93 × 10 −6 mol/L). This study will promote the application of FET sensors in environmental analysis, and provide important guidance to realize rapid, on-site or in-situ monitoring of heavy metals in aqueous solutions.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Dangge Gao,Fangxing Wang,Chi Zheng,Bin Lv,Jianzhong Ma
Cotton textiles with persistent antibacterial qualities are crucial in halting the spread of bacteria and other infections. However, fugitive bacteria and drug-resistant pathogens have rendered tremendous challenges in the development of cotton fabrics with long-lasting antibacterial efficacy. The work aimed to innovatively propose a functional cotton fabric integrating intelligent bacteria-capturing and dual antibacterial properties for efficacious personal health management. The functional cotton fabric was created by modifying the surface of cotton fabric with the quaternized carboxymethyl chitosan (Q-CF) and then covalently grafting the silver@Zr-based porphyrin metal–organic skeleton (Ag@MOF-545) prepared via the “bottle-around-the-boat” method on the surface of Q-CF (AM/Q-CF). In this process, the functional cotton fabric could capture bacteria via positive charges on the surface of the quaternized carboxymethyl chitosan. Due to the synergistic effect of broad-spectrum antibacterial silver nanoparticles (AgNPs) and the visible light-driven antibacterial Zr-based porphyrin metal–organic skeleton (MOF-545), the metabolism of bacteria and drug-resistant strains was well inhibited, which endowed the AM/Q-CF with lasting dual antibacterial properties. After repeated laundering cycles, abrasion cycles, simulated sweat soaking, and long-term storage, the antibacterial rates of AM/Q-CF were over 85%. Altogether, the results provided a potential antibiotic-free alternative for the preparation of durable antibacterial cotton fabrics.
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Nanophotonics
·
2024
·Vol. 13
·期 3
·307-318
·
IF 6.5
Yang Jiao,Yuanyuan Pan,Moru Yang,Zhen Li,Jing Yu,Rong Fu,Baoyuan Man,Chao Zhang,Xiaofei Zhao
Hollow urchin-like substrates have been widely interested in the field of surface-enhanced Raman scattering (SERS) and photocatalysis. However, most reported studies are simple nanoscale urchin-like substrate with limited light trapping range and complicated preparation process. In this paper, a simple and effective controllable synthesis strategy based on micro-nano hierarchical urchin-like ZnO/Ag hollow spheres was prepared. Compared with the 2D structure and solid spheres, the 3D urchin-like ZnO/Ag hollow sphere has higher laser utilization and more exposed specific surface area due to its special hollow structure, which resulted in excellent SERS and photocatalytic performance, and successfully realize the detection and photodegradation of antibiotics. The limited of detection of metronidazole can reach as low as 10 −9 M, and degradation rate achieve 89 % within 120 min. The experimental and theoretical results confirm that the ZnO/Ag hollow spheres can be used in the development of ZnO heterostructure for the detection and degradation of antibiotics, which open new avenues for the development of novel ZnO-based substrate in SERS sensing and catalytic application to address environmental challenges.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Songhao Luo,Zhifeng Liu,Yang Liu,Eydhah Almatrafi,Binbin Shao,Biao Song,Chengyun Zhou,Yukui Fu,Miao He,Zhuotong Zeng,Guangming Zeng
4-nitrophenol (4-NP) in industrial wastewater is harmful to both ecological environment and human health even in the very low concentration in the environment. Catalytic hydrogenation, which converts toxic pollutants from wastewater into high-value industrial feedstocks, is a coveted treatment option, but the design of suitable catalysts has been a challenge in the field. In this work, the functionalized conjugated microporous polymers (CMPs) anchored Ag nanocatalysts could effectively catalyze the hydrogenation of 4-NP in wastewater to 4-aminophenol (4-AP) with the rate constant k of 0.01544 s −1 . We further optimized the morphology of the CMP substrate to stabilize Ag nanocatalysts and integrated the composite into a modular unit for continuous flow wastewater treatment with an outstanding permeation flux of 1603 L m −2 h −1 (LMH). These findings provide an effective strategy to design noble metal catalysts for catalytic hydrogenation and could potentially be modularized for use in mountainous and isolated communities.
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