Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
JinFeng Ou,Wenbin Luo,Jian Li,Yi Yu,Zhen Zhang,Zisheng Chao,WenJun Yi,JinCheng Fan
This paper designed and successfully prepared a novel sandwich-like structure CuS@GO as a cathode material of aluminum batteries (ABs). Graphene oxide (GO) nanosheets sandwich CuS nanotubes (NTs) in the middle, and the interconnected carbon layers form a 3D conductive network to connect all CuS NTs. This nanotubular structure is conducive to the infiltration of electrolytes, provides more active sites, and promotes a rapid charge transfer. The one-dimensional hollow tubular structure of CuS and the sandwich-like structure composed of GO can buffer the volume changes generated during cycling, increase mechanical stress, and enhance the structural stability of the material. The synergistic effect of the unique microstructure composed of CuS NTs and GO leads to an enhanced electrochemical performance. At a current density of 0.2A g–1, CuS@GO maintains a specific capacity of nearly 96.85 mAh g–1 and Coulombic efficiency (CE) of nearly 100% after 200 cycles. The electrochemical reaction mechanism of CuS@GO as a cathode material for ABs was also investigated.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Lei Liu,Xiaolin Liu,Songlong Jiao
The catalytic activity of MoS 2 for hydrogen evolution reaction (HER) is closely-related to its active edge sites and electrical conductivity . In this work, a novel strategy to enhance HER by introducing defects into interface to take advantage of synergistic effect between them was reported. Specifically, in the first step, molybdenum disulfide (MoS 2 ) with additional active edge sites was prepared through defect engineering, and then copper sulphide(CuS)@defect-rich MoS 2 core-shell structure with better electron transport capability was constructed, thus achieving high-efficiency HER by synergistic effect. Benefiting from the additional active edge sites of the defect-rich MoS 2 and the improved charge transport facilitated by the intimate interface, CuS@defect-rich MoS 2 could afford a current density of 10 mA·cm −2 at a low overpotential of 135 mV and a Tafel slope of 50 mV·dec −1 , as well as relatively long-term stability.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
Energy Sources Part A-Recovery Utilization and Environmental Effects
·
2019
·
IF 0.894
Qian Du,Junjie Xu,Zhiyang Cheng,Jianmin Gao
Research on the application of nano-fluids into the direct absorption solar collector represents a prospective approach to solving the problem of high thermal losses of traditional solar collection systems. In this work, Au, CuS and Au-CuS blended Nanoparticles (NPs) were synthesized and the solar photo-thermal conversion performance of them was studied in an experimental investigation. According to the analysis of the results of the experiment, we knew that the temperature and photo-thermal conversion efficiency rised markedly as the light intensity and concentration increase. Our work found that mixing different NPs to match the solar spectral intensity can prepare working fluids for solar photo-thermal conversion instead of increasing the volume fraction of the same NP. When the concentration ratio of Au-CuS blended nanoparticles is 4:6, the conversion efficiency is the highest, reaching 26.04%.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yanxia Liu,Zhaoxiao Zhou,Shengping Zhang,Wenhao Luo,Guofeng Zhang
One of the major challenges of high-performance asymmetric supercapacitors is engineering electrode materials with high capacitance and good cycling stability. Hence, we have successfully prepared different CuS hierarchical structures including CuS tubular structures (T-CuS), CuS hollow microspheres (S-CuS) and CuS hollow microflowers (H-CuS) by adjusting the solvents, all of which are investigated as electrode materials for supercapacitors. Among them, the H-CuS electrode exhibits the best electrochemical performance involving a high capacitance of 536.7 F g −1 at a current density of 8 A g −1 and excellent cycling stability with 83.6% capacitance retention for 20,000 continuous cycles at a current density of 5 A g −1 . In addition, an asymmetric supercapacitor has assembled with H-CuS as positive electrode and activated carbon (AC) as negative electrode, which exhibits a desirable energy density of 15.97 W h kg −1 when the power density is 185.4 W kg −1 . These desirable electrochemical performances powerfully demonstrate that the H-CuS electrode has promising potential for applications in energy storage fields.
研究领域:
材料科学
·
电化学
·
能量存储与转换
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DOI
高影响因子
Nano Research
·
2023
·Vol. 16
·期 6
·8497-8503
·
IF 9.9
Zou Jian,Wu Zhenrui,Tang Ruilin,Ren Zhenzhen,Niu Xiaobin,Wang Liping
Copper sulfide (CuS) is a promising cathode for lithium-ion batteries (LIBs) due to its impeccable theoretical energy density (∼ 1015 Wh·kg −1 and 4743 Wh·L −1 ). However, it suffers from voltage decay leaded energy density loss and low energy efficiency, which hinders its application. In this work, with combined ex-situlin-situ X-ray diffraction (XRD) and electrochemical analysis, we explore detailed degradation mechanisms. For the voltage decay, it is attributed to a spontaneous reaction between CuS cathode and copper current collector (Cu CC). This reaction leads to energy density loss and active materials degradation (CuS → Cu 1.81 S). As for energy efficiency, CuS undergoes a series of phase transformations. The main phase transition processes are CuS → α -LiCuS → Li 2− x Cu x S + Cu → Li 2 S + Cu for discharge; Li 2 S + Cu → Li 2− x Cu x S → β -LiCuS → CuS for charge. Here, α -LiCuS, β -LiCuS, and Li 2− x Cu x S are newly identified phases. These phase changes are driven by topotactic-reaction-related copper diffusion and rearrangement. This work demonstrates the significance of transition-metal diffusion in the intermediates formation and phase change in conversion-type materials.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 44
·e202303144
·
IF 2.1
Sainan Cao,Yongqi Pan,Huangdi Feng,Jingxia Yang
Graphical CuS with three different morphologies (nanoparticles-NP, nanorods-NR, nanoflakes-NFS) were used as catalysts for A 3 coupling reaction, and CuS-NP exhibited the best behavior due to its higher specific surface area and higher Cu + /Cu 0 , which is benefit to promot the activation of alkyne terminal C−H. A 3 coupling reaction can be used to efficiently synthesize propargylamine, which is an important bioactive molecule intermediate, and copper sulfide (CuS) as its catalyst is rarely reported. Herein, CuS with different morphologies including nanoflowers (NFS), nanorods (NR), nanoparticles (NP) were synthesized and applied to the A 3 coupling reaction. The results show that CuS NP has the highest catalytic activity (99 % conversion) compared to other CuS, and also has good group compatibility and recyclability. Combining the activity with the CuS surface structure checked by XPS, BET and HRTEM etc., the excellent catalytic performance of CuS NP can be attributed to its higher specific surface area ((S BET =26.9 m 2 /g, S Langmuir =144.2 m 2 /g), and higher Cu + /Cu 0 (58.9 %), S n 2− (16.7 %). The large specific surface area can provide more active sites, and higher Cu + /Cu 0 , S n 2− content are conducive to promoting the activation of alkyne terminal C−H, which is an important step in the A 3 coupling reaction.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Fangwei Qi,Huixing Li,Gang Chen,Shuping Peng,Xingrui Luo,Shiyu Xiong,Hua Zhu,Cijun Shuai
Graphitic carbon nitride (g-C 3 N 4 ) had aroused tremendous attention in photodynamic antibacterial therapy due to its excellent energy band structure and appealing optical performance. Nevertheless, the superfast electron-hole recombination and dense biofilm formation abated its photodynamic antibacterial effect . To this end, a nanoheterojunction was synthesized via in-situ growing copper sulfide (CuS) on g-C 3 N 4 (CuS@g-C 3 N 4 ). On the one hand, CuS could form Fermi level difference with g-C 3 N 4 to accelerate carrier transfer and thus facilitate electron-hole separation. On the other hand, CuS could respond near-infrared light to generate localized thermal to disrupt biofilm. Then the CuS@g-C 3 N 4 nanoparticle was introduced into the poly- l -lactide (PLLA) scaffold. The photoelectrochemistry results demonstrated that the electron-hole separation efficiency was apparently enhanced and thereby brought an approximate sevenfold increase in reactive oxygen species (ROS) production. The thermal imaging indicated that the scaffold possesses a superior photothermal effect, which effectively eradicated the biofilm by disrupting its extracellular DNA and thereby facilitated to the entry of ROS. The entered ROS could effectively kill the bacteria by causing protein, K + , and nucleic acid leakage and glutathione consumption. As a consequence, the scaffold displayed an antibacterial rate of 97.2% and 98.5% against E. coli and S. aureus , respectively.
研究领域:
材料科学
·
微生物学
·
生物医学工程
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jiawei Long,Haikuo Zhang,Jiahao Ren,Jinjin Li,Mengfei Zhu,Tianli Han,Bai Sun,Shuguang Zhu,Huigang Zhang,Jinyun Liu
Huge volume-change of sulfur and the shuttle effect of polysulfides during charge-discharge severely restrict the electrochemical performance of lithium-sulfur (Li-S) batteries . Herein, we present a novel three-dimensional (3D) multi-layered and porous CuS scaffold derived from metal organic foams (MOFs) as high-performance sulfur host for Li-S batteries. The CuS/S composites enable an optimal environment for accommodating the volume-change of sulfur, and the multiple CuS layers form several shields to prevent the loss of sulfur and polysulfides, efficiently suppressing the shuttle effect. The batteries based on the CuS/S composites exhibit a stable capacity of 750 mAh g −1 after 200 cycles at 0.1 C, and a well-recoverable rate-performance after being tested for three rounds repeatedly. Furthermore, density functional theory (DFT) calculations confirm the novel sulfur host exhibits a strong adsorption ability to polysulfides with large adsorption energies and charge transfers towards Li 2 S 4 , Li 2 S 6 , and Li 2 S 8 .
研究领域:
材料科学
·
电化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 2
·445-451
·
IF 4.831
Wang Cong,Sun Junyong,Mei Han,Gao Feng
The authors describe a fluorescent probe for sulfide that is based on carboxy-functionalized semiconducting polymer dots (P-dots). The dots were prepared from carboxy-functionalized poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-2,1′-3-thiadiazole)] (referred to as COOH-PFBT) via co-precipitation. The P-dots aggregate on addition of Cu(II) ions and their green fluorescence (with excitation/emission peaks at 455/540 nm) is then quenched. Fluorescence is restored on addition of sulfide to the aggregates due to the formation of CuS. This quenching-recovery (“off-on”) mechanism forms the basis for a new sulfide detection scheme. Fluorescence increases linearly in the 1.25 to 75.0 μM sulfide concentration range, with a 0.45 μM detection limit. Good selectivity over other anions is demonstrated. The method shows recoveries ranging between 98.6% and 105.7% when applied to the determination of sulfide in spiked real water samples.
Schematic of a fluorescent off-on sensor for (hydrogen) sulfide based on the use of semiconducting polymer dots (PFBT-COOH) whose fluorescene is quenched by Cu(II) ion but restored on addition of (hydrogen) sulfide.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Shilin Liu,Gaiqing Zhao,Junming Liu,Zhihuan Wang,Qianqian Zhu,Xiaobo Wang,Zhuang Xu
Modern mechanical transmission components face the multiple challenges of friction, wear, and electrical corrosion. To address these issues, the development of multifunctional additives that integrate superior tribological performance with high electrical conductivity has emerged as a critical strategy. In this study, CuS@MXene nanohybrids possessing both excellent tribological and conductive characteristics were designed and synthesized as multifunctional additives for supramolecular gels. The in-situ uniform loading of CuS nanoparticles onto the Mo 2 C MXene surface was achieved via molten salt etching and electrostatic adsorption strategies. Its tribological performance and lubrication mechanisms as a lubricant additives in supramolecular gels were investigated using a reciprocating friction and wear tester, X-ray photoelectron spectroscopy, and Focused Ion Beam-Transmission Electron Microscopy. Tribological evaluations revealed that, compared to the pure gel, the gel containing 2.0 wt% CuS@MXene reduced the average coefficient of friction by 56.1% and the wear volume by 83.9%, while enhancing the load-carrying capacity by two times. The lubrication mechanism of CuS@MXene is attributed to the formation of a “hard-soft” synergistic composite tribofilm at the sliding interface; this film leverages the complementary advantages of its components to deliver exceptional lubrication performance. Furthermore, the nanohybrids significantly enhanced the electrical conductivity of the gel, thereby reducing the electrical resistance of the tribofilm. This work provides a novel strategy for developing multifunctional additives with robust lubricating and conductive capabilities to mitigate friction and electrical corrosion in mechanical components.
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高影响因子
ChemElectroChem
·
2026
·Vol. 13
·期 9
·e70192
·
IF 5.2
Behroz Khan,Muhammad Alim,Ayesha Tariq,Tilahun Yai Fayesa,Mathar Hamza,Amjd M. H. N. Al-Muraisy,Bin Wang,Rashid Iqbal
The electrochemical transformation of carbon dioxide into valuable fuels represents a critical pathway for sustainable energy cycles. A principal obstacle in this field is the creation of affordable and effective electrocatalysts that combine high conversion rates with precise control over reaction products. To overcome these limitations, we have developed a composite in which copper sulfide nanoflowers are grown directly on a reduced graphene oxide (rGO) matrix via a one-pot synthesis. Detailed material analysis indicates that the presence of rGO promotes a crystallographic shift from the covellite (CuS) structure to a metastable digenite (Cu 7.2 S 4 ) phase. Spectroscopic investigations verify substantial electron transfer at the Cu 7.2 S 4 /rGO interface, leading to a modified electronic configuration around the copper sites. In electrochemical tests, the hybrid materials display markedly improved CO 2 reduction performance. The optimized Cu 7.2 S 4 /rGO-10 catalyst delivers a Faradaic efficiency (FE) of 82% for formate at −0.5 V versus reversible hydrogen electrode, a significant improvement over the pure CuS benchmark (64%). Furthermore, tuning the rGO loading redirects the catalytic selectivity, with the Cu 7.2 S 4 /rGO-40 variant yielding a 75% combined FE for liquid products, predominantly ethanol. These composites also demonstrate minimal hydrogen evolution and superior long-term stability. This work underscores the multifunctional contribution of rGO in stabilizing unconventional material phases, enhancing electrical conductivity, and directing reaction mechanisms, thereby establishing a generalizable approach for fabricating high-performance electrocatalysts for carbon-neutral technologies. Graphical Copper sulfide nanoflowers grown on reduced graphene oxide undergo a phase transition to metastable digenite (Cu 7.2 S 4 ), enabling efficient CO 2 electroreduction. The optimized catalyst achieves 82% Faradaic efficiency for formate, while tuning rGO content shifts selectivity toward ethanol. This work presents a versatile strategy for designing advanced electrocatalysts through phase and interface engineering.
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高影响因子
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