SCRIPTA MATERIALIA
·
2020
·
IF 5.079
Yuanyue Li,Youchao Cui,Zhao Yao,Guoxia Liu,Fukai Shan
In this report, one-dimensional Cu-doped NiO nanofibers were synthesized by electrospinning and their electrochromic (EC) performance was investigated. It is demonstrated that the Ni 0.97 Cu 0.03 O nanofibers exhibit particularly fast switching speed (1.6 s for coloring and 0.9 s for bleaching) among NiO-based EC devices reported so far. Furthermore, other outstanding EC properties, including large transmittance modulation (73% at 550 nm), high coloration efficiency (77.9 cm 2 C −1 ) and good cycling durability (80% after 2000 cycles), were also achieved for Ni 0.97 Cu 0.03 O nanofibers. These attractive EC properties are attributed to their one-dimensional nanostructures with small size grains and superior electrical conductivity .
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DOI
高影响因子
NANO
·
2023
·
IF 1.2
Chengsha Huang,Jin Li,Benze Wu
To obtain highly efficient photocatalysts, we successfully prepared the GO/ZnO/CdS/Cu 2 S composite that possesses superior photocatalytic degradation performance via a three-step solvothermal process. A series of characterization techniques were used to verify the composition and performance of prepared samples, such as X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM), Raman spectra, photoluminescence (PL) spectroscopy and so on. SEM reveals that copper ions are supported on the surface of CdS to form active sites for photocatalysis. Under the irradiation of ultraviolet (UV) and visible light, GO/ZnO/CdS/Cu 2 S photocatalyst exhibited relatively excellent photocatalytic degradation efficiency of methylene blue (MB), with 100% (80 min) and 95% (30 min), respectively. Compared with pure ZnO ( k = 7 . 1 4 × 1 0 − 4 ) under the illumination of UV light, the kinetic constant of GO/ZnO/CdS/Cu 2 S catalyst is up to 8 . 1 3 × 1 0 − 2 , and as for visible light illumination, up to 9 . 8 7 × 1 0 − 2 , showing relatively excellent visible-light-induced photocatalytic activity. Besides, under UV and visible light, after three cycles of photodegradation, GO/ZnO/CdS/Cu 2 S still maintains the degradation efficiency of 78.3% and 74.8%, respectively, indicating that it has good stability. This work might inspire a new perspective that introduces the surface reaction sites (Cu 2 S) in the design of other graphene oxide/mental oxide-based heterojunctions for environmental purification.
研究领域:
材料科学
·
光催化
·
环境净化
·
纳米复合材料
·
半导体异质结
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DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2023
·
IF 2.8
Jiafeng Chen,Jingying Si,Yifeng Zhang,Yanhong Chen,Rongrong Jia,Shixun Cao,Zhenjie Feng
NbTe 2 is a monoclinic quasi-two-dimensional layered semimetal . This paper reports the change of physical properties of NbTe 2 single crystals under the action of copper substitution. The zero-field ab -plane resistivity ρ xx shows that the samples havegood metallicity . Magnetoresistance changes of up to 23% were observed at a magnetic field of 13 T without any tendency to saturate. We have observed linear magnetoresistance under high magnetic field, which will be attributed to the linear band dispersion of small Fermi pockets. And we use a formula to describe the linear relationship: ρ = N i B π n 2 e c ∝ B . The curve of the Hall resistance changing with the magnetic field at the same temperature has a linear relationship with the magnetic field, and the slope is positive, which indicates that the carrier type is mainly hole-type carriers.
研究领域:
凝聚态物理
·
材料科学
·
电子输运
·
半金属
·
二维材料
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2026
·
IF 13.5
Miao Zhao,Qi Mao,Pengfei Zhang,Manyi Gao,Xuefei Zhao,Chunmei Ding,Can Li
With the advancement of industry and agriculture, substantial nitrate-containing pollutants have been discharged. This leads to severe environmental pollution and imbalance in nitrogen cycle, threatening ecology environment and human health. Electrocatalytic nitrate reduction to ammonia can convert pollutants into important chemical feedstocks and energy-storage molecules, providing a feasible route for ammonia production using renewable energy. However, this reaction is complicated and involves multiple steps and intermediates, suffering from high overpotential and limited selectivity and activity. To solve this issue, herein we designed a mixed-valence Cu/CuO x catalyst which is primarily composed of Cu and Cu 2 O and shows three-dimensional nanowire structure, achieving efficient nitrate reduction reaction for ammonia synthesis. The current density for ammonia production reaches 1.89 A·cm −2 at −0.22 V vs . RHE (reversible hydrogen electrode), with a Faradaic efficiency of 80.9%. Cu/CuO x also maintains excellent stability during prolonged electrolysis. The apparent and normalized performances of Cu/CuO x are much higher than those of the control systems, such as Cu and Cu 2 O. Experimental and theoretical results prove that the Cu 0 and Cu + species in Cu/CuO x play synergistic roles, promoting the conversion of *NO intermediate to *NOH and accelerating the desorption of NH 3 . The nanowire structure provides abundant active sites, thereby enhancing the performance of nitrate reduction to ammonia. This work not only provides an efficient catalyst for nitrate reduction to ammonia but also serves as a guideline for the rational design of such catalysts. Synergistic effect of Cu 0 and Cu + in Cu/CuO x nanowires enables efficient nitrate reduction to ammonia. Download: Download high-res image (261KB) Download: Download full-size image
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Green Energy & Environment
·
2026
·
IF 16.7
Yusi Wang,Hui Zhang,Daolan Liu,Yanfei Zhao,Wei Zeng,Rongxiang Li,Minhao Tang,Yuxuan Wang,Xianshuo Zhang,Zhimin Liu
The recycling of spent polyesters into oxygen-containing chemicals provides a novel way to access such chemicals, and is also of great significance for solving the problems caused by polyester waste. Herein, we present hydrogenolysis of aliphatic polyesters into diols over MgAlO x supported Cu catalysts (Cu/MgAlO x -m) via a methanolysis-hydrogenation strategy under relatively mild conditions (e.g., 200 °C, 4 MPa). The as-designed Cu/MgAlO x -10 catalyst with Cu content of 10 wt.% shows the best performance, which could convert polycaprolactone into 1,6-hexanediol in a high yield of 98.0%. It is revealed that the Cu species in the catalyst mainly exist in the form of Cu 0 and Cu + , in which Cu 0 is responsible for H 2 activation, and Cu + for ester group activation and stabilization of reactive intermediates. The ratio of Cu 0 to Cu + species determines the selectivity towards diols. This work provides a highly efficient catalyst for hydrogenolysis of aliphatic polyesters into diols, which may have industrial application prospects.
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产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Peibo Li,Guoqiang Luo,Guinan Zhao,Yi Sun,Qiang Shen
The scale effect of intermetallic compounds (IMCs) plays a pivotal role in governing the mechanical behavior of Al-Cu composites. To investigate this, a series of composites incorporating intermetallic compounds (IMCs) of varying dimensions was fabricated. Experimental results reveal that the mismatch in thermal expansion coefficients between the IMCs and the Al matrix induces interfacial strain gradients. At the nanoscale, these gradients facilitate the nucleation of fault networks that effectively impede dislocation motion by reducing the mean free path, thereby surpassing the limitations predicted by the conventional Hall–Petch relationship. Moreover, nanoscale IMCs serve as dislocation pinning sites, thereby activating the Orowan strengthening mechanism. In contrast, micron-scale IMCs demonstrate limited ability to form dislocation loops, and the stacking faults (SFs) generated during stress relaxation become sources of mobile dislocations. The acceleration of dislocation at phase boundaries leads to stress concentration and premature failure. These insights provide valuable guidance for the structural and compositional design of metal matrix composites .
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Hanjun Zou,Yan Tong,Yajie Feng,Yongfeng Zhou,Jiaxun Xiao,Lu Xia,Anku Guha,Barbara Polesso,Bin Zhang,Juanli Liu,Kaiwen Wang
Subnanocluster (SNC) cocatalysts are considered to be promising cocatalysts for photocatalytic hydrogen evolution reaction (HER) due to their rich surface-active sites and high atom utilization efficiency. Herein, a reductant-mediated in situ growth of the atomic clusters procedure is developed to synthesize SNC-Cu serving as advanced cocatalysts on TiO2 nanoparticles for HER. The optimized SNC-Cu/TiO2 catalyst, with 1.8 wt % metal mass loading, exhibits a remarkable hydrogen evolution rate of 6832 μmol g–1 h–1, which is ca. 25-fold that of bare TiO2 (273 μmol g–1 h–1 and comparable to that of 1 wt % Pt-modified TiO2 (7754 μmol g–1 h–1). Meanwhile, decent photostability and recyclability are also certified via a 20 h durability test. Comprehensive electron microscopy and spectroscopy characterizations unveil that the outstanding performance of SNC-Cu/TiO2 can be attributed to accelerated charge separation/transfer and suppressed photoinduced electron–hole recombination. Furthermore, in situ X-ray photoelectron spectroscopy and first-principle calculations reveal that the electron-localized SNC-Cu, with its abundant surface sites, facilitates *H adsorption and desorption, thus enhancing the HER activity significantly. This work highlights the promising potential of constructing noble-metal-free SNCs in semiconductors for photocatalytic HER.
研究领域:
材料科学
·
能源科学
·
化学
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DOI
高影响因子
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2022
·
IF 1.052
Xin Zhang,Liang Wang,Qiaoyong Zhu
A chlorosulfonylation of vinylarenes using magnetic metal–organic framework (MOF) composite Cu-BTC@Fe3O4 (BTC = 1,3,5-benzenetricarboxylate) as the catalyst has been developed. This protocol features easily accessible starting materials, good functional group compatibility and simple recovery of the catalyst. The recovered catalyst could be reused for at least successive five runs with only a slight decrease in its catalytic activity.
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DOI
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 8
·3864-3872
·
IF 2.562
Hao Liu,Chaoyang Wang
Chitosan scaffolds with hierarchical macroporous structures for recyclable adsorption of Cu(II) ions are prepared by templating from Pickering high internal phase emulsions (HIPEs) for the first time. The liquid paraffin-in-water HIPEs are stabilized by chitosan nanoparticles (CNPs). The internal phase fraction can be up to 90.0%; meanwhile, the chitosan concentration only needs to be 1.0 wt%. The chitosan scaffolds were obtained by crosslinking the dispersed CNPs, followed by removing the internal phase. The resulting scaffold exhibits the average pore size of around 15 μm and interconnecting channel size of several micrometers. The adsorption capacities of the chitosan–glutaraldehyde (chitosan–GLA) scaffolds for Cu(II) ions increase with increasing the molar ratio of –NH2 of CNPs to –CHO of GLA. At the optimized ratio of 2 : 1, the adsorption capacity is 60.2 mg g−1 at room temperature and pH 5.0. The adsorption capacity can be greatly improved by addition of carboxymethylated chitosan or adopting an imprinting method, and the adsorption capacities are 100.2 and 90.3 mg g−1, respectively. The adsorption isotherm of the chitosan scaffold closely follows Freundlich model. Furthermore, the adsorption capacity of the scaffold after undergoing 10 consecutive desorption–adsorption cycles still remains at a high level of 90.3%, suggesting the chitosan scaffold is a green and recyclable biosorbent for practical wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
·
吸附
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DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Peng Huang,Nan Li,Liang Zeng,Yujie Zhu
The long-term goal of electrochemical ammonia (NH3) synthesis under ambient conditions is to replace the Haber–Bosch process. One of the biggest challenges in this field is that the N≡N triple bond is too stable to be activated. Therefore, most research is mainly focused on the development of advanced electrocatalysts to address this challenge. However, the extremely low solubility and slow diffusion of N2 molecules in aqueous electrolytes are usually overlooked. Here, the Bi-loaded Cu hollow microtube with a porous structure is reported as the gas diffusion electrode for N2 electroreduction. Compared with the conventional planar electrode configurations, the hollow gas diffusion electrode (HGDE) possesses unique advantages in breaking through the mass transfer limit of low-solubility gases. It can also provide abundant electrochemically active sites due to its porous structure, forming a gas–liquid–solid three-phase interface that is conducive to electrocatalytic reactions. Besides, the adjustable N2/H3O+ at the three-phase interface can further help enhance the reaction activity and selectivity. As a result, the Bi-loaded Cu HGDE exhibits an NH3 yield of 4.6 μg h–1 cm–2 and a Faradaic efficiency of 5.8% at −0.4 V (vs RHE, reversible hydrogen electrode). This study may stimulate interest in optimizing the electrode structure and developing types of electrodes for efficient electrochemical ammonia synthesis.
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产品关联
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Jing Chen,Ying Chen,Shuying Li,Jiao Yang,Jianbin Dong,Xiaoquan Lu
Tyrosine is the precursor of some neurotransmitters such as thyroxine and dopamine. It has the effect of regulating emotions and stimulating the nervous system. Changes in tyrosine levels in the human body are associated with certain diseases. Therefore, it is very necessary to prepare a new type of tyrosine sensor. In this work, an enzyme-free electrochemical sensor based on MXene/CNTs/CuMOF composite was developed for the detection of tyrosine. Embedding carbon nanotubes (CNTs) into MXene effectively prevented the aggregation of MXene sheets. Further modification of MXene/CNTs materials with CuMOF octahedral particles with porous structure can improve the porosity and catalytic capability of the composites. Under the optimal detection conditions, the prepared sensor has good linearity in the detection of tyrosine within range 0.53 μM–232.46 μM with a limit of detection (LOD) of 0.19 μM. The stability and selectivity of the sensor is high, and can be used to detect tyrosine in human serum.
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产品关联
DOI
高影响因子
Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-13
·
IF 16.419
Xie Shiyin,Li Yang,Li Xu,Zhou Yujun,Dang Ziqi,Rong Jianhua,Dong Liubing
Zn-based electrochemical energy storage (EES) systems have received tremendous attention in recent years, but their zinc anodes are seriously plagued by the issues of zinc dendrite and side reactions (e.g., corrosion and hydrogen evolution). Herein, we report a novel strategy of employing zincophilic Cu nanowire networks to stabilize zinc anodes from multiple aspects. According to experimental results, COMSOL simulation and density functional theory calculations, the Cu nanowire networks covering on zinc anode surface not only homogenize the surface electric field and Zn 2+ concentration field, but also inhibit side reactions through their hydrophobic feature. Meanwhile, facets and edge sites of the Cu nanowires, especially the latter ones, are revealed to be highly zincophilic to induce uniform zinc nucleation/deposition. Consequently, the Cu nanowire networks-protected zinc anodes exhibit an ultralong cycle life of over 2800 h and also can continuously operate for hundreds of hours even at very large charge/discharge currents and areal capacities (e.g., 10 mA cm −2 and 5 mAh cm −2 ), remarkably superior to bare zinc anodes and most of currently reported zinc anodes, thereby enabling Zn-based EES devices to possess high capacity, 16,000-cycle lifespan and rapid charge/discharge ability. This work provides new thoughts to realize long-life and high-rate zinc anodes.
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DOI
PubMed
高影响因子
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