INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 35
·20411-20420
·
IF 4.6
Qin Mingxin,Ye Yuanyuan,Zhang Mengjie,Li Zhiming,Chen Yang,Yao Fanglei,Chen Ziheng,Wu Qikang,Hu Zhi,Yue Sisi,Niu Weichao,Li Feng,Zhang Cheng,Wang Jin
Electrochemical CO 2 reduction reaction (CO 2 RR) enables sustainable conversion of CO 2 into
high-value
fuels and chemicals, yet precise selectivity control toward methane
(CH 4 ) and multicarbon (C 2+ ) products remains
difficult. Herein, we develop a cyclic voltammetry (CV)-triggered
electrochemical reconstruction strategy to modulate the CO 2 RR selectivity of Cu-LDH-derived catalysts. Tailoring the CV potential
window and cycle number effectively tunes the catalyst microstructure
and copper (Cu) valence state: narrow potential windows with limited
cycles produce grain-boundary-rich Cu particles with low-valence sites,
which promote *CO accumulation and C–C coupling to yield a
high C 2+ Faradaic efficiency (FE) of 83.3% at 400 mA cm –2 . In comparison, expanded potential windows with prolonged
cycling induce the formation of nanoclusters with abundant high-valence
Cu sites, which suppress C–C coupling and favor the sequential
deep hydrogenation of adsorbed *CO intermediates, achieving a CH 4 FE of 64.7% at 300 mA cm –2 . Ex situ characterizations and in situ spectroscopic
analyses reveal that CV-driven dissolution–redeposition dominates
the evolution of particle size, grain boundaries, and Cu valence,
thereby governing the CO 2 RR reaction pathways. This work
establishes a facile electrochemical reconstruction strategy for programmable
modulation of CO 2 RR product selectivity.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xinggong Hu,Jiong Li,Guoyong Du,Chunping Deng,Sike Chen
With the development of oil enterprise and petrochemical industry, more and more oily wastewater is generated, which highlights the urgency of oil/water separation. In order to solve the troubles of cumbersome membrane training and effortless clogging when the use of the membrane separation method, this find out about proposes a new and simple technique to prepare modified oil/water separation membranes based on commonly used PVDF membranes with the assist of covalent cross-linking of pyrogallic gallic acid (PG) and glutathione (GSH), and chelating and liganding of copper nanoparticles (Cu NPs). PG can be rapidly oxidized by Michael addition/Schiff response to generate a mussel-like adhesion layer, and the hydrophilic coating formed by way of covalent cross-linking with glutathione (GSH) incorporates a giant variety of catechol functional groups, which can be chelated and ligated with Cu NPs to structure a steady superhydrophilic phenolic community coating. The Cu@MF-PG/GSH membranes were capable to separate more than a few kinds of stable oil-in-water emulsions with surfactants, and the separation fluxes were giant (all fluxes have been >779 L/m2.h). Meanwhile, the separation efficiencies were all greater than 99% with excellent biking stability (flux recovery >97%). In addition, the self-cleaning property of Cu@MF-PG/GSH membranes was tested. The outcomes showed that the Cu@MF-PG/GSH membrane could be restored to a easy kingdom after simple water rinsing even when it was once contaminated by soybean oil with high viscosity. It suggests terrific self-cleaning performance
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RSC Advances
·
2019
·Vol. 9
·期 62
·35948-35956
·
IF 3.049
Yue Pan,Weijia Zeng,Rong Hu,Bo Li,Guiling Wang,Qintang Li
Cu foil is widely used in commercial lithium ion batteries as the current collector of anode materials with excellent conductivity and stability. In this research, commercial Cu foil was chosen as the current collector and substrate for the synthesis of Cu doped flake-NiO via a traditional hydrothermal method. The effect of the ratio of Cu and the calcination temperature on the electrochemical performance of NiO was investigated. The structure and phase composition of the Cu doped flake-NiO electrode were studied through X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and inductive coupled plasma emission spectrometry (ICP). The electrochemical properties of the Cu doped flake-NiO electrode were studied through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and a galvanostatic charge–discharge cycling technique. According to the results, the Cu-doped NiO electrode, calcined at 400 °C with a molar ratio of Cu : Ni = 1 : 8, exhibited a high reversible charge capacity. The good cycling stability and rate performance indicate that the as-prepared electrode can be applied as a potential anode for lithium ion batteries.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
·
电池技术
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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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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·51876-51886
·
IF 5.8
Yu Weiting,Zhu Jieyun,Chen Sizhuo,Tang Juntao,Ye Jiexu,Song Shuang
The electrocatalytic reduction of CO 2 towards CO is one of the most desirable routines to reduce atmospheric CO 2 concentration and maintain a global carbon balance. In this work, a novel porous NiCu-embedded ZIF-derived N-doped carbon nanoparticle (NiCu@NCNPs) catalyst has been identified as an active, highly selective, stable, and cost-effective catalyst in CO 2 reduction. A CO selectivity as high as 100% has been achieved on NiCu@NCNPs which is the highest reported to date. The particle current density of CO on NiCu@NCNPs is around 15 mA cm –2 under the optimized potential at −0.9 V vs. RHE. The NiCu@NCNPs electrode also exhibits excellent stability during the five sequential CO 2 electroreduction experiments. The superior catalytic performance of NiCu@NCNPs in CO 2 RR can be related to its microstructure with high electrochemical surface area and low electron transfer resistance. Furthermore, a kinetic analysis has shown the formation of intermediate *COOH is the rate-determining step in CO 2 RR towards CO. According to the results of density functional theory (DFT) calculations, a low Gibbs-free energy change (∆ G ) for the rate-determining step leads to the enhanced catalytic performance of CO 2 RR on NiCu@NCNPs.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jing Yang,Shiying Fan,Xinyong Li,Yiyuan Tao,Jingang Wang,Guohua Chen
Electrochemical selective dechlorination of dichloromethane (DCM) to chloromethane is a promising and sustainable strategy of resources. However, the current lack of high-performance electrocatalysts and complicated dechlorination mechanisms pose significant challenges. In this study, we report a series of Cu single-atom catalysts (SACs) supported on Co 3 O 4-β spinel with a tube-in-tube nanofiber structure, denoted as Cu x SACs/Co 3 O 4-β , where x represents the theoretical Cu loading (0.26 wt%, 0.30 wt% and 0.50 wt%). These catalysts effectively dechlorinate DCM, producing high-value hydrocarbons like chloromethane and methane. Notably, Cu 0.30 SACs/Co 3 O 4-β exhibited a high chloromethane production rate (2931 μmol g −1 h −1 ) and selectivity (76%) at −2.98 V vs (Ag/AgCl/Me 4 NCl) due to the synergy of cobaltosic oxide (Co 3 O 4 ) spinel and Cu single atom. X-ray photoelectron spectroscopy and electron paramagnetic resonance experiments confirmed the presence of additional surface oxygen vacancies in Cu 0.30 SACs/Co 3 O 4-β , which improved the electrocatalysis performance for DCM dechlorination. Furthermore, a concerted dechlorination mechanism was suggested based on the transfer coefficient α . This research paves the way for the development of novel spinel electrocatalysts and the advancement of dechlorination reactions.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Jianhui Yan,Yi Wang,YuanJun Guo
Cu-WS 2 composites are being used as self-lubricating materials for various engineering applications. The poor wettability between Cu and WS 2 is a main obstacle for obtaining high-performance Cu-WS 2 . In order to improve the wettability, a thin Cu layer was deposited on the surface of the WS 2 powder through an electroless plating technology. Cu-WS 2 composites were prepared via spark plasma sintering (SPS) using the mix powders of Cu and Cu-WS 2 . Microstructure, mechanical properties and tribological properties of the Cu-WS 2 composites were investigated, and that of the Cu were also comparatively studied. Results show that the WS 2 powder coated with Cu (abbreviated as WS 2 @Cu powder) improves the poor wettability between Cu and WS 2 and meanwhile the distribution of WS 2 . Cu-WS 2 composites sintered below 750 °C could reduce the reaction between Cu and WS 2 and ensure more WS 2 in the composites. Both the coefficient of friction (COF) and the wear rate of the Cu-WS 2 are lower than that of the Cu. A lubricant film leads to the excellent tribological properties as the Cu-WS 2 composites were tested at 25−200 °C. However, the disappearance of WS 2 and the formation of Cu 2 O cause to the decreasing self-lubricating performances at 300−500 °C. With an increase in the test temperature, the dominant wear mechanisms of the Cu-WS 2 composites change from adhesive wear to a mixture of abrasive and oxidation wear, and that of the Cu change from adhesive wear to a mixture of fatigue and oxidation wear.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jiemei Yu,Zhankun Jiang,Taizhong Huang,Chengchun Tang
Preparing economic, stable, and highly efficient non-precious-metal materials for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of great significance to the development of storage technologies and energy conversion. In this manuscript, we report a novel Cu based nano-catalyst as an electrode material fabricated by complexation-reduction method. Benefit from the stable of h-NB and the good electrical conductivity of CNT , the tri-functional electrocatalyst BN/Cu/CNT displays enhanced activity towards ORR and with the high current density of 0.95 mA/cm 2 , which is comparable to that of commercial Pt/C catalyst (cathodic peak current: 1.05 mA/cm 2 ). The BN/Cu/CNT also demonstrates high catalyst activity for the OER. From the rotating disk electrode and rotating ring-disk electrode tests, the number of electrons exchanged during the ORR is revealed to be 3.92, suggesting a 4e − pathway of O 2 reduction to H 2 O. The as prepared catalyst also has good stability and superior methanol tolerance to the commercial Pt/C catalyst in alkaline medium . Thus, it is anticipated that the BN/Cu/CNT catalyst is surely helpful for providing a new space to develop Pt-free catalyst.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Zhong Zhao,Changwang Yan,Daiqi Li,Xiaoning Tang,Jianhua Ran,Shuguang Bi,Deshan Cheng,Guangming Cai,Xin Wang
The inevitable oxidation of metal layer deposited on substrates is a nonnegligible issue when developing functional textiles. In this study, were on the surface of to form a metallic Cu layer, and graphene (GO) sheets were spray-coated onto an in-situ grown copper nanoparticle (Cu NP) layer on a nylon knitted fabric (NKF) to prevent the oxidation of copper. In addition, a synergistic effect on further enhancing the electrical conduction capacity was realized by the hydrothermal reduction of the GO sheets using L-ascorbic acid (L-AA). The morphology, chemical composition and structure of the NKFs were characterized by SEM, FTIR, XRD and XPS , respectively. The novel rGO/Cu@NKF architecture enabled the fabric prospects of promising action sensing capability as reflected by the repeated ΔR/R 0 peaks recorded in action sensing during real running exercises. The mechanism of sensing and the responsiveness together with the stability of the sensors were investigated. The rGO/Cu@NKF also showed efficient electrothermal performance as evidenced by a maximum surface temperature of 95.0°C after 120 s into the charging process at 15 V. These results demonstrated the potential of the rGO/Cu@NKF in smart textiles with action sensing and heating functions.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Tongyang Zhang,Aihua Yan,Sen Luo,Fei Huang,Jixu Zhang,Ye Gao,Wenxue Zhao,Ziwu Liu,Xianhui Zhao
Photocatalytic technology still faces enormous challenges to design and synthesize highly efficient photocatalytic materials with a high electron/hole separation efficiency, rapid charge migration, low carrier recombination rate, and strong visible light-harvesting capability. Herein, Cu-doped ZnIn2S4/NixP (marked CuyZIS/NP) composites were successfully synthesized by a simple two-step method. The synergistic effect of Cu2+ doping and the NixP cocatalyst on hydrogen evolution performance was investigated in detail. The results showed that superior photoactivity over CuyZIS/NP composites was achieved. The optimal Cu0.5ZIS/NP-1/2 sample had a hydrogen evolution rate of 4746.3 μmol·g–1·h–1 under visible light irradiation, which was approximately 15.98 times higher than that of pure ZnIn2S4 (297 μmol·g–1·h–1). This work may offer a valuable insight into understanding the synergistic effect of doping and cocatalysis and provide a guideline for designing and developing highly efficient visible light-driven photocatalysts toward a water splitting system.
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PeerJ
·
2023
·
IF 2.7
Hanxun Yue,Xuan Zhao,Qin Yong,Min Shi,Xiaofeng Jiang,Yating Zhang,Xian Yu
Background In this study, a natural compound quercetin (Qu) was investigated for its various antitumor effects. However, due to its poor water solubility and low bioavailability, its clinical application is limited. To overcome this constraint, a modification was to Qu, which resulted in the creation of novel flavonoid self-assembling nanoparticles (HCQ NPs). Methods HCQ NPs were synthesized by a self-assembly method and characterized using transmission electron microscopy, the Malvern Zetasizer instrument, X-ray photoelectron spectroscopy (XPS), the ultraviolet-visible spectrophotometric method (UV-vis), Fourier transform infrared (FITR) and inductively coupled plasma mass spectrometry. Extracellular, methylene blue spectrophotometric analysis was used to determine the ability of HCQ NPs to react with different concentrations of H 2 O 2 to form hydroxyl radicals ( • OH). Intracellular, DCFH-DA staining was used to detect the ability of HCQ NPs to react with H 2 O 2 to generate reactive oxygen species. Flow cytometry was used to detect the uptake of HCQ NPs by MDA-MB-231 cells at different time points. The biocompatibility of HCQ NPs was evaluated using the Cell Counting Kit-8 (CCK-8) assay. Calcein AM/PI double staining and the CCK-8 assay were used to evaluate the synergistic antitumor effect of HCQ NPs and H 2 O 2 . Results HCQ NPs showed uniformly sized analogous spherical shapes with a hydrodynamic diameter of 55.36 ± 0.27 nm. XPS revealed that Cu was mainly present as Cu 2+ in the HCQ NPs. UV−vis absorption spectrum of the characteristic peak of HCQ NPs was located at 296 nm. Similarly, FTIR spectroscopy revealed a complex formation of Qu and Cu 2+ that substantially changed the wavenumber of the 4-position C = O characteristic absorption peak. Based on the proportion of Qu and Cu 2+ (1:2), the total drug loading of Qu and Cu 2+ in the HCQ NPs for therapeutic purposes was calculated to be 9%. Methylene blue spectrophotometric analysis of • OH indicated that Cu can lead to the generation of • OH by triggering Fenton-like reactions. HCQ NPs rapidly accumulated in MDA-MB-231 cells with the extension of time, and the maximum accumulation concentration was reached at about 0.5 h. Calcein AM/PI double staining and CCK-8 revealed synergistic antitumor effects of HCQ NPs including the chemotherapeutic effect of Qu and chemodynamic therapy by Cu 2+ in a simulated tumor microenvironment. HCQ NPs demonstrated very low toxicity in LO2 cells in the biocompatibility experiment. Conclusion This study show cases a new method of creating self-assembled flavonoid HCQ NPs that show great for fighting cancer.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Kai Zhao,Xun Zhao,Tianbo Gao,Xuan Li,Guanqi Wang,Xinxiang Pan,Junsheng Wang
A novel dielectrophoresis (DEP)-assisted device for the bioremediation of heavy metal ions by using Chlorella microalgae is presented in this paper. To generate the DEP forces, pairs of electrode mesh were inserted in the DEP-assisted device. By applying DC electric field via the electrodes, the inhomogeneous electric field gradient is induced and the strongest non-uniform electric field exists near the mesh cross-corner. After the adsorption of Cd and Cu heavy metal ions by Chlorella , the Chlorella chain were trapped along the vicinity of the electrode mesh. Then, the effects of Chlorella concentration on the adsorption of heavy metal ions, and the applied voltage and electrode mesh size on the removal of Chlorella are conducted. In the co-existing Cd and Cu solutions, the individual adsorption ratio of Cd and Cu reaches as high as approximately 96% and 98%, respectively, showing excellent bioremediation capability of multiple heavy metal ions in wastewater. By adjusting the applied electric voltage and the mesh size, the Chlorella adsorbed with Cd and Cu are captured by negative DC-DEP effects and the removal ratio of Chlorella reach an average of 97%, providing a method for the removal of multiple heavy metal ions in wastewater by using Chlorella microalgae.
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