Science China-Materials
·
2015
·Vol. 58
·期 9
·693-703
·
IF 0
Liu Jian,Zhao Yuheng,Liu Jialong,Wang Shouguo,Cheng Yan,Ji Muwei,Zhou Yuanmin,Xu Meng,Hao Weichang,Zhang Jiatao
Heterovalent doping represents an effective method to control the optical and electronic properties of semiconductor nanocrystals (NCs), such as the luminescence and electronic impurities (p-, n-type doping). Considering the phase structure diversity, coordination varieties of Cu atoms in Cu 2 S NCs, and complexity of Cu doping in II-VI NCs, monodisperse Cu 2 S NCs with pure hexagonal phase were synthesized firstly. Then through cation exchange reaction between Cd ions and well-defined Cu 2 S NCs, dominant Cu(I) doped CdS NCs were produced successfully. The substitutional Cu(I) dopants with controllable concentrations were confirmed by local atom-specific fine structure from X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) spectroscopy, elemental analysis characterizations from X-ray photoelectron spectroscopy (XPS) and the electron spin resonance (ESR) measurement. The dominant and strong Cu(I) dopant fluorescence was verified by their absorption and photoluminescence (PL) spectra, and PL lifetime. Finally, the band positions and the p-type conductivities of the as-prepared Cu 2 S and Cu(I) doped CdS NCs were identified by ultraviolet photoelectron spectroscopy (UPS) measurements. The high monodispersity of NCs enables their strong film-scale self-assembly and will hasten their subsequent applications in devices.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 38
·385501
·
IF 3.953
Yanxin Liao,Qian Du,Shupei Sun,Nianfeng Shi,Guangfu Yin,Zhongbing Huang,Xiaoming Liao
Self-supported Cu2S/Cu(OH)2 composite nanorods for highly sensitive non-enzymatic glucose sensing were in situ grown on Cu foam by simple hydrothermal treatment of aligned Cu(OH)2 nanorods. The physicochemical and electrochemical properties of the as-fabricated Cu2S/Cu(OH)2 composite nanorods were characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, Raman spectroscope, x-ray photoelectron spectroscope, cyclic voltammetry, electrochemical impedance spectroscopy, amperometric i–t measurements. The mechanism of the composite nanorods produced on conductive substrates was also explored. The electrode exhibits a sensitivity of 9626.88 μA mM−1 cm−2 towards glucose with good anti-interference ability, indicating it a promising electrode material for the enhanced non-enzymatic glucose detection.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 4
·630-636
·
IF 4.136
Ke Wang,Ying Huang,Yade Zhu,Meng Yu,Mingyue Wang
Graphical Cubic composites : Cu 2 O/Cu 2 S-rGO composites are synthesized by using a facile growth process. Benefiting from the rGO coating and the “breathable” structure formed by Cu 2 O and Cu 2 S, the resulting material delivers an initial discharge capacity of 878.6 mAh g 1 , stable cycling stability of 417.35 mAh g 1 after 100 cycles, retaining 73.5 % of its initial charge capacity, demonstrating a significantly improved cycling reversibility and structural stability. Cubic Cu 2 O/Cu 2 S particles with a novel truncated edge structure anchoring on reduced graphene oxide (Cu 2 O/Cu 2 S-rGO composites) were synthesized by using a facile growth process. Compared to simple Cu 2 O cubes and bare Cu 2 O/Cu 2 S particles, the Cu 2 O/Cu 2 S-rGO composite shows a competitive capacity and stable cyclic stability as anode materials for sodium-ion batteries (SIBs). At a low current density of 60 mA g −1 , the Cu 2 O/Cu 2 S-rGO composite delivers an initial discharge capacity of 878.6 mAh g −1 , stable cycling stability of 417.35 mAh g −1 after 100 cycles, retaining 73.5 % of its initial charge capacity, demonstrating a significantly improved cycling reversibility and structural stability. The enhanced electrochemical performance for Cu 2 O/Cu x S-rGO composites might be ascribed to the rGO coating and the “breathable” structure formed by Cu 2 O and Cu 2 S. The outer coated rGO nanosheets could maintain the structural integrity and electrical conductivity, and the main active component (Cu 2 O and Cu 2 S) is present in the form of small clusters, providing “breathable” aggregates capable of effective sequential shrinkage and expansion.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 13
·8009-8018
·
IF 4.036
Ying Wu,Danying Xing,Linna Zhang,Hualiang Suo,Xiaodan Zhao
Transition metal ion-activated sulfite autoxidation processes for the production of sulfate radicals (SO4˙−) have been widely investigated to achieve efficient abatement of recalcitrant organic pollutants. However, these homogeneous processes suffered from narrow effective pH range and metal release, thus restricting their practical application. In order to address this problem, we report a simple and efficient approach to iohexol abatement by a combined Cu2S and sulfite process (simplified as Cu2S/sulfite process) based on the superior activation performance of copper and the excellent electron donating capacity of the low-valent sulfur species. Compared with typical copper oxides, Cu2S can significantly accelerate the sulfite autoxidation to generate radicals, leading to 100% iohexol abatement in the Cu2S/sulfite process. The influence of solution pH and dissolved oxygen on iohexol abatement is also investigated. Qualitative and quantitative analysis of reactive radicals is performed by electron paramagnetic resonance (EPR) and radical quenching experiments. Generation of SO4˙− from sulfite activation with Cu2S mainly contributes to the iohexol abatement. X-ray photoelectron spectroscopy (XPS) suggests that copper is the main activation site and the reductive sulfur species can achieve the continuous regeneration of copper. Application potential of the Cu2S/sulfite process is also assessed. This study provides a new method for the treatment of water and wastewater containing organic micropollutants.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Wanqing Li,Lei Wu,Xiaochao Wu,Chuan Shi,Yongliang Li,Lei Zhang,Hongwei Mi,Qianling Zhang,Chuanxin He,Xiangzhong Ren
The precise design and controllable manufacture of electrocatalysts for efficient oxygen reactions (OER and ORR) based on the abundant elements of the earth are urgently required but challenging task. In this study, a CoS 2 /Cu 2 S heterostructured composite (CoS 2 /Cu 2 S-NF) supported by the porous carbon nanofibers is synthesized as a high-efficiency oxygen reaction electrocatalyst. As indicated from in-situ characterization methods (infrared, Raman and XRD) integrated with the density functional theory results, the heterostructures exhibited by CoS 2 and Cu 2 S could be regulated. The results show that the electron transfer/interaction between CoS 2 and Cu 2 S in the heterojunction were regulated, as well as the electronic structures of Co and Cu sites. As impacted by the structural engineering and the electronic modulation, the activity was enhanced, and the performance of electrocatalytic oxygen reactions was improved, which exhibited the lowest potential difference for (ΔE = 0.73 V) compared with commercial electrocatalysts. The liquid ZAB in accordance with on CoS 2 /Cu 2 S-NF exhibited a stable charge and discharge capacity up to 590 h and a great power density reaching 260.60 mW cm −2 . Moreover, the flexible solid-state ZAB based on CoS 2 /Cu 2 S-NF exhibited a great competitive power density (92.06 mW cm −2 ), robust flexibility and an obvious integration. As compared with single metal sulfide-NF, the Density functional theory calculations (DFT) highlight the adsorption on CoS 2 /Cu 2 S-NF side surface in the heterojunction, which more specifically demonstrates the synergistic effect in the junction. This work presents a direction for designing heterostructured junctions as electrocatalyst and moreover its great application potential in rechargeable metal-solid batteries.
研究领域:
电化学
·
材料科学
·
催化
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Dandan Guo,Hongmei Yu,Jun Chi,Yun Zhao,Zhigang Shao
Herein, we prepared highly active self-supported Cu 2 S@NiFe layered double hydroxides nanosheets (LDHs) oxygen evolution reaction (OER) electrode (Cu 2 S@NiFe LDHs/Cu foam) with three-dimensional (3D) multilayer hollow nanorod arrays structure, which is composed of the outer layer (two-dimensional (2D) NiFe LDHs) and the inner layer (one-dimensional (1D) Cu 2 S hollow nanorod arrays). The unique structure of NiFe LDHs and Cu 2 S hollow nanorod composites can expose more active sites, and simultaneously promote electrolyte penetration and gas release during the water electrolysis process. Thus, the Cu 2 S@NiFe LDHs/Cu foam electrode exhibits a significant OER performance, with the overpotentials of 230 and 286 mV at 50 and 100 mA cm −2 , respectively. Anion exchange membrane water electrolyzer (AEMWE) with the prepared electrode can attain a voltage of 1.56 V at the current density of 0.50 A cm −2 , showing a good performance that is comparable to the-state-of-the-art AEMWE in 1 M KOH. In addition, the AEMWE can be run for 300 h at the current density of 0.50 A cm −2 . The high performance and good stability of AEMWE are attributed to the special structure of the OER electrode, which can prevent the agglomeration of nanosheets and thus expose more active sites at the edge of the nanosheets.
研究领域:
材料科学
·
电化学能源
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2023
·
IF 18.9
Shilin Zhu,Wei Wu,Zheng Li,Jianlin Luo
Lee et al. report that the compound LK-99, with a chemical formula of Pb 10-x Cu x (PO 4 ) 6 O (0.9 < x < 1.1), exhibits room temperature superconductivity under ambient pressure. In this study, we investigated the transport and magnetic properties of pure Cu 2 S and LK-99 containing Cu 2 S. We observed a sharp superconducting-like transition and a thermal hysteresis behavior in the resistivity and magnetic susceptibility. However, we did not observe zero resistivity below the transition temperature. We argue that the so-called superconducting behavior in LK-99 is most likely due to a reduction in resistivity caused by the first-order structural phase transition of Cu 2 S at around 385 K, from the hexagonal structure phase at high temperature to the monoclinic structure phase at low temperature.
研究领域:
凝聚态物理
·
材料科学
·
超导电性
·
相变物理
·
电子输运性质
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Meiling Yang,Xiaofang Liu,Bin Zhang,Yao Chen,Hengyang Wang,Jian Yu,Guoyu Wang,Jingtao Xu,Xiaoyuan Zhou,Guang Han
Cu2S, consisting of Earth-abundant and eco-friendly elements, is a promising candidate for thermoelectric energy conversion. The stoichiometric Cu2S has intrinsically low thermal conductivity together with meagre electrical conductivity. Herein, in order to improve the electrical properties, we develop a facile solvothermal method for synthesizing a series of Cu2–xS with tunable phase compositions. With reduction in the CuCl/Na2S molar ratio in the solution precursors from 2:1 to 1.75:1, the solvothermal products transform from single-phase Cu2S into Cu2S–Cu1.96S composites, which are preserved in the hot-pressed pellets. The decreased CuCl/Na2S molar ratio results in increased room-temperature Hall carrier concentration, leading to enhanced electrical conductivity. Specifically, the pellet corresponding to the 1.75:1 CuCl/Na2S precursor ratio obtains a power factor of 8.04 μW cm–1 K–2 at 815 K, which is ∼735% of the value obtained by stoichiometric Cu2S. Along with the moderate thermal conductivity, this sample achieves an enhanced zT value of 0.87 at 815 K, representing a ∼250% increase when compared to stoichiometric Cu2S. This study demonstrates an effective strategy in enhancing the thermoelectric performance of solution-synthesized Cu2S-based materials by phase tuning.
研究领域:
材料科学
·
能源材料
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yunhao Xi,Fei Li,Weiqing Shen,Xiang Li,Pengfei Zhang,Nengwu Zhu,Pingxiao Wu,Zhi Dang
Stabilized heavy metals-containing phases and low chlorine utilization limit heavy metals chlorination reactions . The traditional method of adding chlorinating agents can promote heavy metals chlorination volatilization, but the limiting factor has not been resolved and more chlorides are emitted. Herein, a new reaction pathway to promote heavy metals chlorination volatilization through the transformation of stabilized heavy metals-containing phases and chlorine species by the addition of biomass at the sintering is first reported. The Cu volatilization efficiency increased sharply from 50.50% to 93.21% compared with the control, Zn, Pb, and Cd were nearly completely volatilized. Results show that the biomass carbonization process was more important for Cu chlorination volatilization. Stabilized heavy metals-containing phases were converted from Cu 2 S to CuO and Cu 2 O with the biochar and oxygen, increasing the activity of Cu. The chlorine species KCl reacted with CH 3 -containing groups to form CH 3 Cl, which reacted with CuO with a lower Delta G than HCl and Cl 2 , increasing the tendency for the conversion of CuO to CuCl. Cu chlorination volatilization process, following shrinking core kinetic model and controlled by chemical reactions. The outcomes fundamentally addresses the limiting step for heavy metals chlorination volatilization, supporting the incineration fly ash harmless treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 4
·2903-2912
·
IF 1.5
Yingjie Zhang,Yongtai Li,Qiao Zhang,Chuan Shi,Xue Li,Yiyong Zhang
With the widespread popularization of rechargeable portable devices, lithium-ion batteries have been researched in depth and have brought huge economic benefits. To improve the energy density and safety of lithium-ion batteries, research on new materials is urgent. Cu2S has attracted the attention of researchers for its excellent physicochemical properties. It not only has an excellent reversibility of electrochemical lithium storage with high energy density but also has a low manufacturing cost. The electrolyte is responsible for transporting electrons and ions in the lithium battery. It is one of the important modules of the battery and has an important impact on the electrochemical performance of the battery. At present, there is very little research on the suitable electrolytes for Cu2S. The effects of different types of ether electrolytes on the electrochemical performance of Cu2S are studied in this paper. In addition, an activation process of the Cu2S electrode material during the initial cycles is also studied.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Chunrong Yan,Yuxin Chen,Shuaijie Han,Yingdong Wang,Haixia Zhang,Ying Hou,Junjie Guo
Layered double hydroxides (LDHs) are promising cathode materials for supercapacitors but are limited by insufficient active sites and poor reaction kinetics. To address this, this work develops a CoNi 2 S 4 /NiCo-LDH/Cu 2 S composite with a multilevel heterostructure via localized in-situ sulfidation. The structure features 1D Cu 2 S nanorods as a framework, 2D NiCo-LDH nanosheets providing high surface area, and 0D CoNi 2 S 4 nanoparticles grown in situ as additional active sites. This design enhances conductivity, surface area, and redox-active sites, promoting ion adsorption and migration. The electrode achieves an areal capacitance of 12.4 F cm −2 at 3 mA cm −2 and retains 80.6% at 20 mA cm −2 . The assembled asymmetric supercapacitor delivers an energy density of 1.29 mWh cm −2 and power density of 2.39 mW cm −2 , with 90.7% capacitance retention and 99.6% coulombic efficiency after 10,000 cycles. It also powers an LED and fan, demonstrating practical potential. This study offers new insights into designing high-performance electrodes through multilevel heterostructures and localized in-situ sulfidation.
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 17
·2415
·
IF 5.3
Meiqi Mu,Bin Li,Jing Yu,Jie Ding,Haishan He,Xiaokang Li,Jirong Mou,Jujun Yuan,Jun Liu
Porous C nanosheet/Cu2S composites were prepared using a simple self-template method and vulcanization process. The Cu2S nanoparticles with an average diameter of 140 nm are uniformly distributed on porous carbon nanosheets. When used as the anode of a potassium-ion battery, porous C nanosheet/Cu2S composites exhibit good rate performance and cycle performance (363 mAh g−1at 0.1 A g−1after 100 cycles; 120 mAh g−1at 5 A g−1after 1000 cycles). The excellent electrochemical performance of porous C nanosheet/Cu2S composites can be ascribed to their unique structure, which can restrain the volume change of Cu2S during the charge/discharge processes, increase the contact area between the electrode and the electrolyte, and improve the electron/ionic conductivity of the electrode material.
研究领域:
材料科学
·
储能
·
纳米材料
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）