ELECTROCHEMISTRY COMMUNICATIONS
·
2020
·
IF 4.333
Xin Zong,Jie Zhang,Jinqiu Zhang,Wen Luo,Andreas Züttel,Yueping Xiong
The electrochemical reduction of carbon dioxide (CO 2 RR) has attracted enormous interest because of the energy crisis and climate change; however, more efficient catalysts are required for practical applications. Herein, we present electrospinning as a facile strategy to synthesize a three-dimensional network of carbon nanofibers embedded with Cu and CeO x nanoparticles (Cu/CeO x @CNFs) as a CO 2 RR catalyst. The Cu–CeO x interface produced using this method offers synergistic geometric and electronic effects which optimize the adsorption strength of reaction intermediates for the electroreduction of CO 2 to CO. In a flow cell configuration, a current density of 100 mA cm −2 and a CO faradaic efficiency of 59.2% can be obtained at −0.60 V vs. RHE.
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高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 37
·8599-8606
·
IF 5.344
Zhen Lin,Linlin Zheng,Wensong Yao,Shijun Liu,Yemei Bu,Qi Zeng,Xiaomin Zhang,Haohua Deng,Xinhua Lin,Wei Chen
Nanozymes have emerged as enzyme-mimicking nanomaterials to overcome the low stability and high cost of some natural enzymes. The design and fabrication of nanozymes with superior performance to natural enzymes are in urgent demand. Single-atom catalysts offer the unique characteristics of maximum atomic utilization, and are an excellent candidate for nanozymes. However, most of the reported synthesis methods for single-atom catalysts require the preparation of supports for single-atom catalysts in advance, which requires multiple steps and calcination in a high temperature atmosphere. Herein, Cu–N–C single-atom nanozymes (Cu–N–C SAzymes) were successfully designed via a one-pot solvothermal method. Cu–N–C SAzymes exhibited excellent peroxidase-mimicking activity that is superior to some other related nanoparticles. The mechanism study revealed that H2O2 was catalyzed by Cu–N–C SAzymes to generate reactive oxygen species. Furthermore, based on the excellent peroxidase-mimicking activity of the Cu–N–C SAzymes, a simple and sensitive detection method for H2O2 and glucose has been developed.
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PubMed
高影响因子
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2023
·
IF 2.5
Guo Jing,Wang Hai-jing,Liu Shuang-juan,Zhang Peng,Tang Jing-yu,Zhang Wei-yang,Guo Han-jie,Wang Peng-cheng,Meng Cai
A room-temperature electrodeposition method with an organic electrolyte was developed to fabricate a HNO 3 -pretreated graphene paper Cu (GP′–Cu) composite. To improve the interfacial bonding of GP′–Cu composite, magnetron sputtering technology was used to create a “sandwich” structural gradient GP′–Cu composite. The selection of the intermediate transition layer metal was based on two-dimensional disregistry. Scanning electron microscopy, X-ray photoelectron spectroscopy, and other analytical methods confirmed that the addition of an intermediate transition metal (Cr, Ni) layer reduced the gap distance and enhanced the interfacial bonding of the GP′ and Cu deposited layers. The GP′–Ni–Cu composite exhibited the largest increase in tensile strength and conductivity. In addition, it had the highest thermal diffusivity and elongation at break among the GP′–Cu, GP′–Cr–Cu and GP′–Ni–Cu composites.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 13
·e2220792120
·
IF 11.1
Junwei Zhang,Xikun Zhang,Chiwei Xu,Yiwen Liu,Jiaxi Xu,Zhonghao Miao,Haoxiang Yu,Lei Yan,Liyuan Zhang,Jie Shu
Selenium sulfide (SeS2) features higher electronic conductivity than sulfur and higher theoretical capacity and lower cost than selenium, attracting considerable interest in energy storage field. Although nonaqueous Li/Na/K-SeS2 batteries are attractive for their high energy density, the notorious shuttle effect of polysulfides/polyselenides and the intrinsic limitations of organic electrolyte have hindered the deployment of this technology. To circumvent these issues, here we design an aqueous Cu-SeS2 battery by encapsulating SeS2 in a defect-enriched nitrogen-doped porous carbon monolith. Except the intrinsic synergistic effect between Se and S in SeS2, the porous structure of carbon matrix has sufficient internal voids to buffer the volume change of SeS2 and provides abundant pathways for both electrons and ions. In addition, the synergistic effect of nitrogen doping and topological defect not only enhances the chemical affinity between reactants and carbon matrix but also offers catalytic active sites for electrochemical reactions. Benefiting from these merits, the Cu-SeS2 battery delivers superior initial reversible capacity of 1,905.1 mAh g−1 at 0.2 A g−1 and outstanding long-span cycling performance over 1,000 cycles at 5 A g−1. This work applies variable valence charge carriers to aqueous metal–SeS2 batteries, providing valuable inspiration for the construction of metal–chalcogen batteries.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Hongbo Yu,Weiqiang Tang,Kaijie Li,Hongfeng Yin,Shuangliang Zhao,Shenghu Zhou
Motivated by the high performance of intermetallic compounds with their ordered structures, developing synthetic methods for preparing intermetallic compounds is highly desired. Herein, we report facile syntheses and rational design of the structurally ordered Cu-based intermetallic compounds (CuM (M = Pt, Pd, Au)). To achieve this, intermetallic nanoparticles were synthesized in solution by a butyllithium co-reduction method at 240 °C. The developed wet-chemistry syntheses of ordered intermetallic CuM nanoparticles avoided solid annealing process, and thus relatively small intermetallic nanocrystals were formed. The ordered PtCu nanocatalysts displayed enhanced chemoselectivity relative to the PtCu solid-solution alloy and individual monometallic nanocatalysts for catalytic hydrogenations of a series of substituted nitroaromatics. The DFT-based theoretical calculations for hydrogenations of halonitrobenzenes suggest that the surface geometry of ordered PtCu structures favor the hydrogenation of nitro substituent and disfavor the hydrodechlorination by-reaction, resulting in enhanced chemoselectivity.
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MATERIALS SCIENCE FORUM
·
2018
·
IF 0
De Zhi Wang,Yu Qing Zhang,Bo Hua Duan
In this work, Molybdenum trioxide and conventional copper particles were used as precursors, reduced in hydrogen atmosphere. Then Cu@Mo Powders were successfully synthesized. Effects of reduction temperature on the microstructure of the composite powders and the performance of the intermediate product (molybdenum dioxide) were investigated. Results show that 700°C is the optimal reduction temperature, because Mo is reduced from its oxide and forms a coating layer on the surface of copper particles tightly without serious crack. Mo-20wt.% Cu composite powders where Cu is coated uniformly with continuous molybdenum layer are successfully obtained by co-reduction method.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Qing-Qing Huang,Yang-Jie Lin,Rui Zheng,Wei-Hua Deng,Chiranjeevulu Kashi,P. Naresh Kumar,Guan-E Wang,Gang Xu
Metal-organic frameworks (MOFs) are a kind of functional porous materials with the potential applications in gas adsorption and separation, catalysis, energy storage, sensor, and electrical conductivity . However, the insulating nature of the mostly MOFs limits their application in the electronic field. A new three-dimensional (3D) metal-organic framework composed of Cu 2+ centres and polyacid linkers (TATAB 3− ) was synthesized by solvothermal method , which contains two types of Cu 24 cages. The crystal structure is cubic and each Cu is coordinated by five oxygen atoms which can be confirmed by the single crystal X-ray diffraction, infrared spectra and TGA analysis. The conductivity for this 3D MOF is increased by four orders of magnitude after doping with 7,7,8,8-tetracyanoquinodimethane (TCNQ) and realizes the transformation from an insulator to semiconductor.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shuwei Liu,Lu Wang,Min Lin,Dandan Wang,Ziqi Song,Shuyao Li,Rui Ge,Xue Zhang,Yi Liu,Zhimin Li,Hongchen Sun,Bai Yang,Hao Zhang
Gold nanorods (AuNRs) are potentially useful in tumor theranostics, but the poor stability, high toxicity, and rapid removal by the immune system seriously limit their theranostic applications. In our study, we demonstrate the fabrication of Cu(II)-doped polydopamine-coated AuNR (AuNR@CuPDA), which significantly improves the potentials in tumor theranostics. Besides the improvement of physiological stability and biocompatibility, the PDA shell increases the photothermal performance and prolongs the blood circulation time of AuNRs. The half-life of AuNRs during blood circulation increases from 0.7 to 4.5 h after PDA coating, and the injected dose per gram of tumor tissue is 4.6% ID g–1 for AuNR@CuPDA. In addition to computer tomography imaging, the loading of Cu(II) in PDA shell endows AuNR@CuPDA with magnetic resonance imaging function. Cu(II) doped in PDA shell also exhibits chemotherapeutic behavior, and the tumor inhibitor rate is 31.2%. Further combining 808 nm laser-driven photothermal therapy, tumors were completely ablated, and no recurrence was observed. Liver and renal functions tests and histological analysis of major organs confirm that AuNR@CuPDA is in good safety.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yu-Ying Wang,Xiao-Yang Zhang,Shu-Lan Li,Feng-Lei Jiang,Peng Jiang,Yi Liu
The colorimetric sensor has made great achievements in glucose sensing and diabetes prediction due to its simplicity, visualization, and lack of need for sophisticated instruments. The noninvasive sampling method has received more attention. Herein, a colorimetric agarose gel sensor was constructed by combining Cu-doped carbon nanowires (CuCNWs) with excellent peroxidase-like activity and glucose oxidase (GOx). CuCNWs can effectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with a maximum catalytic rate of 12.5 × 10–8 M s–1, which is superior to most nanomaterials reported. The modification by PVP can significantly improve the stability of CuCNWs under physiological conditions without affecting their catalytic activity. By introducing GOx, the sensitive detections of hydrogen peroxide (H2O2) and glucose in a wide range with the limit of detection as low as 30 nM and 0.2 μM can be achieved. Notably, the colorimetric agarose gel sensor exhibits a higher sensitivity than commercial test strips in detecting glucose in solution. Furthermore, it was applied to the detection of urine glucose. Diabetic urine can be easily distinguished from normal urine by judging color changes with the naked eye. This work is of great significance in guiding the construction of colorimetric agarose gel sensors and expands the applications of nanozymes in the biosensing fields.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Qiuping Yang,Haixia Kong,Liwei Tang,Yanyun Ma,Feng Liu,Maochang Liu,Yi Wang,Pu Zhang,Yiqun Zheng
Metal nanoparticles have been found to exhibit a broad spectrum of antibacterial activities, yet not all metals possess the captivating plasmonic properties necessary for effective interaction with incident light. In this study, we demonstrate the feasibility of synergistically enhancing the Cu-induced antibacterial activity through the incorporation of plasmonic photothermal therapy by hybridlike anchoring the Cu component on a gold (Au) nanoplate that can effectively absorb near-infrared light. To fabricate the Janus structure, plate-like Au seeds were mixed with copper(ii) nitrate, cetyltrimethylammonium bromide, ascorbic acid, and hexamethylenetetramine, resulting in the formation of Au–Cu Janus nanostructures (JNSs). Notably, the plasmonic absorption of Au was preserved without being hindered by the Cu coating. Photothermal measurements revealed that the temperature rise of Au–Cu JNSs aqueous suspensions could reach up to 28.3 °C in just 10 min when exposed to 1064 nm laser light at a power density of 1 W·cm–2, with a photothermal conversion efficiency of 42.14%. Additionally, they show broad-spectrum antibacterial properties, making them potential contenders for addressing a wide range of bacterial infections. Our findings demonstrate that the antibacterial performance of metal nanoparticles composed of less plasmon-active components but with exceptional antibacterial properties can be significantly enhanced by coupling them with a plasmon-active nano-antenna through a Janus architecture. The Au–Cu JNSs possess potential application prospects in photothermal therapy, broad-spectrum antibacterial treatments, biomedical imaging, targeted drug delivery, sensitive diagnostics, and the development of advanced materials.
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JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 46
·期 5
·2697-2704
·
IF 1.491
Liu Shuai,Peng Nan,Bai Yu,Ma Dayan,Ma Fei,Xu Kewei
Cu-doped Bi 2 Te 3 hexagonal nanoplates were fabricated by a simple solvothermal method. Scanning electron microscopy and transmission electron microscopy characterization illustrated that the nanoplates are single-crystal ones with an average width of 300 nm and thickness in the range of 20–30 nm. It was demonstrated that Cu
x
Bi 2 Te 3 nanoplates possess the lowest thermal conductivity (0.8–1.2 W/m K) at 300 K, which is mainly due to the enhanced phonon scattering by grain boundaries. Furthermore, the doped Cu could evidently enhance the power factor of Bi 2 Te 3 through optimizing the carrier transport properties. As a result, Cu 0.02 Bi 2 Te 3 nanoplates exhibit the best thermoelectric performance with a figure of merit of 0.33, which is more than two times higher than that of Bi 2 Te 3 nanoplates.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Yijun Zhang,Yu Jin,Meiling He,Lei Zhou,Tao Xu,Rongrong Yuan,Sai Lin,Weidong Xiang,Xiaojuan Liang
Bimetallic gold-copper and gold-copper solid solutions nanocrystals (NCs) with orthorhombic morphologies were successfully embedded in sodium borosilicate glass; these materials were fabricated via a facile and synthetic sol-gel technique. Microstructural investigations demonstrate that the Au-Cu intermetallic nanostructure is generated in the glass host. Z-scan technique was applied to reveal the third-order nonlinear optical properties of the as-obtained glasses at the wavelength of 800 nm. The as-synthesized glasses exhibit similar nonlinear behaviors with reverse saturation absorption effects and self-focusing performances. The third-order nonlinear susceptibility χ (3) values were optimized by tuning the sizes of the Au-Cu NCs. The χ (3) of Au-Cu(1), Au-Cu(2) and Au-Cu(3) measured to be 3.1 × 10 −12 , 5.4 × 10 −12 , and 4.4 × 10 −12 esu for the single-pulse energy of 1 μJ. We have discussed the nonlinear optical mechanism of Au-Cu sodium borosilicate glass that may be due to the quantum confinement effects and surface plasmon resonance effects.
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