Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 11
·5699-5708
·
IF 11.301
Xin Qian,Dongyang Wang,Yang Zhang,Haijun Wu,Stephen J. Pennycook,Lei Zheng,Pierre F. P. Poudeu,Li-Dong Zhao
The metallic elements with a small atomic radius can not only compensate for the intrinsic vacancies to improve the carrier mobility, but also can form interstitials to reduce lattice thermal conductivity. In this work, we investigate the contrasting roles of three different metallic elements with small atomic radius on the thermoelectric properties of n-type PbM0.01Se (M = Cu, Zn, Ni). We find that all the metallic elements can increase the carrier concentration as electron donors and improve the electrical transport properties. In addition, the lattice thermal conductivity of PbSe can be significantly decreased through the formation of interstitials by the incorporated extra metallic elements. We also find that the PbCu0.01Se sample exhibits a unique and complex behavior compared with the other samples due to the diffusion and the thermally activated oxidation of Cu+ ions. When the temperature increased to 673 K, the carrier concentration of PbCu0.01Se sample increases suddenly and continues to increase by nearly two folds, which we ascribe to the release of 3d orbital electrons in Cu+ ions. This results in a strong decoupling of the charge and heat transport in the material, which can be manifested by the overestimation of the electronic thermal conductivity when assuming strong electron–phonon coupling in Wiedemann–Franz law. A maximum ZT of ∼1.6 can be reached at 773 K and the average ZT of ∼0.96 can be achieved in PbCu0.01Se. Our results demonstrate the exceptional contrasting behavior of Cu in PbSe by comparing with Zn and Ni, and the thermoelectric performance of n-type PbSe can be enhanced through the introduction of extra metallic elements with small radius.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 71
·41561-41568
·
IF 3.049
Cuifeng Jiang,Xiaoxiu Wei,Shuai Bao,Huajian Tu,Wei Wang
Nanomaterial-based artificial peroxidase has attracted extensive interests due to their distinct advantages over natural counterpart. Cu@Au/Pt and Cu@Ag/Pt nanocomposite with rambutan-like structure were prepared and discovered to function like peroxidase, which was illustrated by catalyzing the oxidation reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) accompanied with a blue color change. Steady-state investigation indicates that the catalytic kinetics of Cu@Au/Pt and Cu@Ag/Pt all followed typical Michaelis–Menten behaviors and Cu@Au/Pt showed a strong affinity for H2O2, while Cu@Ag/Pt showed strong affinity for TMB. The color change and absorbance intensity strongly depend on the concentration of H2O2, thus the direct determination of H2O2 and indirect detection of glucose were demonstrated using Cu@Au/Pt with a detection limit of 1.5 μM and 6 μM, respectively. What is more important, the method was applied for detection of glucose in 50% fetal bovine serum with a detection limit of 80 μM, which is much lower than the lowest glucose content in blood for diabetes (7 mM). Moreover, the Cu@Au/Pt nanocomposite were also successfully applied for sensing L-cysteine because of the inhibition effect. Considering the good peroxidase-like activity and novel structure, Cu@Au(Ag)/Pt is expected to have a wide range of applications in bioassays and biocatalysis.
研究领域:
生物化学
·
纳米医学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2025
·Vol. 13
·期 4
·1110
·
IF 2.8
Shikang Zhao,Guohong Chen,Kaiqi Zheng,Shaojie Li,Jiaqi Xu,Fanan Wang,Xueping Liu,Rengui Weng
γ-Valerolactone (GVL) is a promising bio-based platform molecule with significant potential for energy applications. The production of GVL via biomass-based levulinic acid (LA) is an important reaction. To enhance the conversion and selectivity of non-precious-metal catalysts in the LA-to-GVL process and to better understand the key factors influencing this conversion, we conducted a series of experiments. In this study, supported Cu-Ni bimetallic catalysts (Cu-Ni2/Al2O3) were prepared using layered double hydroxides (LDHs) as a precursor. Compared with Cu-Ni catalysts synthesized via the conventional impregnation method, the Cu-Ni2/Al2O3catalysts exhibit higher catalytic activity and stability. The results demonstrated that efficient conversion was achieved with isopropanol as the hydrogen donor solvent, a reaction temperature of 180 °C, and a reaction time of 1 h. The yield of GVL reached nearly 90%, with a decrease of approximately only 6% after six consecutive cycles. The Cu-Ni2/Al2O3catalyst proved to be effective for converting biomass-derived LA to GVL, offering a route that not only reduces production costs and environmental impact but also enables efficient biomass-to-energy conversion.
研究领域:
催化化学
·
能源科学
·
生物质利用
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ruiqi Zhang,Yanyan Zhang,Kang Wang,Xitao Wang,Baoquan Zhang
In this work, the heterostructure between Cu particles and ZnFe-LDH semiconductor with lantern shape was constructed by reducing the ternary CuZnFe-LDH using H 2 , and the effects of Cu loading and the formation of heterojunction on photocatalytic CO 2 reduction to CO and CH 4 were investigated. The results showed that the hollow and layer-stacking structure of the catalyst was beneficial to the light utilization, adsorbing and activating of carbon dioxide. The Cu cations could enter into the lattice of ZnFe-LDH to form a ternary CuZnFe-LDH, which could be reduced to Cu particles with smaller size by H 2 and resulting in the heterostructure between Cu and ZnFe-LDH. The loading of Cu particles can significantly enhance the light absorption, photogenerated carriers transfer rate and separation efficiency of ZnFe-LDH, thus improving photocatalytic activity. As expected, Cu 1.6 ZnFe-R catalyst exhibited the highest catalytic activity with CO yield of 45.35 μmol·g cat −1 ·h −1 and CH 4 yield of 39.33 μmol·g cat −1 ·h −1 , which were 2.81 and 6.19 times higher than those of ZnFe-LDH, respectively. Meanwhile, Cu particles acted as electron-rich centers and CO 2 adsorption sites can noticeably improve the CH 4 selectivity and inhibit H 2 production. The Cu 1.6 ZnFe-R catalyst exhibits the highest CH 4 electron-based selectivity of 65.17 %, the highest electrons consumed of 482.80 μmoL·g cat −1 ·h −1 for CO 2 reduction and the lowest H 2 electron-based selectivity of 16.04 %.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Hui Su,Shaojia Song,Songsong Li,Yangqin Gao,Lei Ge,Weiyu Song,Tianyi Ma,Jian Liu
Rational design of low-cost and efficient electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is imperative for renewable energy conversion. Herein, for the first time, a facile strategy is developed to synthesize M (M = Fe, Cu, Zn, Mo) doped bimetallic sulfide heterostructure Ni 3 S 2 /Co 3 S 4 electrocatalysts. The as-prepared bifunctional Cu-Ni 3 S 2 /Co 3 S 4 electrode exhibits excellent electrocatalytic activity for HER and OER in 1 M KOH electrolyte, and it requires only an overpotential of 79 mV (150 mV) to deliver 10 mA cm −2 (20 mA cm -2 ) current density for HER process. Moreover, it shows a considerable low cell voltage of 1.49 V at the current density of 10 mA cm -2 in a two-electrode configuration which is far surpassing most of the reported bifunctional metal sulfides. Meanwhile, besides increasing the specific surface area of the electrocatalyst by optimizing the microstructure, the introduction of Cu cation could also stimulate the formation of high-valent Ni/Co sites, which can be verified by XPS technique. Density function theory calculations demonstrate that the Cu-doping boosts the formation of high valent Co sites and enhances the charge transfer performance of Ni and Co species, thus promotes intrinsic catalytic activity through modulating the d-band center of Co and reducing the adsorption energy of H and O-containing intermediates (H*, OH*, OOH*) on the surface of the catalyst. This work suggests the importance of exploitation of transition metal ion-doping for promoting the electrocatalytic activity of bimetallic sulfides.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 49
·2304644
·
IF 13.3
Ping Lu,Zhaoyang Qi,Jie Chen,Changshen Ye,Ting Qiu
High-efficiency adsorption of aromatic sulfur-containing compounds from liquid hydrocarbon fuels over metal-organic frameworks (MOFs) is challenging because of inert metal sites. A new method, the Ce-enhanced modulation of MOFs’ microenvironment, is proposed to modulate the –COO···Cu(II)– coordination microenvironment of Hong Kong University of Science and Technology (HKUST-1) using Ce(III) as a molecular scalpel for fabricating abundant high-efficiency Cu(I) and Cu-coordination-unsaturated sites and improving the pore structures around adsorptive sites. The optimal CH-250 thus exhibits adsorptive capacities for 20.2, 28.0, and 58.3 mg S g –1 of thiophene, benzo-thiophene, and dibenzothiophene, respectively, which are superior to most reported MOFs, zeolites, and nanoporous carbons. The constructed Cu(I) sites show stronger affinity for dibenzothiophene (−0.86 eV) than the initial Cu(II) (−0.74 eV) for out-of-plane adsorption. Further, they are far stronger in-plane adsorption interactions in DBT/CH-250 (−0.90 eV) than those in DBT/HKUST-1 (−0.37 eV). Thus, molecular engineering for modulating the coordination microenvironment of MOFs shows great potential for adsorption desulfurization.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 11
·3623
·
IF 3.4
Arif Ullah Khan,Muhammad Tahir,Fazal Ul Nisa,Mizna Naseem,Iqra Shahbaz,Zeyu Ma,Zilu Hu,Abdul Jabbar Khan,Muhammad Sabir,Liang He
Metal-oxide-based gas sensors are extensively utilized across various domains due to their cost-effectiveness, facile fabrication, and compatibility with microelectronic technologies. The copper (Cu)-based multifunctional polymer-enhanced sensor (CuMPES) represents a notably tailored design for non-invasive environmental monitoring, particularly for detecting diverse gases with a low concentration. In this investigation, the Cu-CuO/PEDOT nanocomposite was synthesized via a straightforward chemical oxidation and vapor-phase polymerization. Comprehensive characterizations employing X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and micro Raman elucidated the composition, morphology, and crystal structure of this nanocomposite. Gas-sensing assessments of this CuMPES based on Cu-CuO/PEDOT revealed that the response current of the microneedle-type CuMPES surpassed that of the pure Cu microsensor by nearly threefold. The electrical conductivity and surface reactivity are enhanced by poly (3,4-ethylenedioxythiophene) (PEDOT) polymerized on the CuO-coated surface, resulting in an enhanced sensor performance with an ultra-fast response/recovery of 0.3/0.5 s.
研究领域:
材料科学
·
环境监测
·
传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JACS Au
·
2025
·
IF 8.7
Xuan Bie,Yukun Pan,Xiaowei Wang,Shiyu Zhang,Jiahui Hu,Xiaoxiao Yang,Qinghai Li,Yanguo Zhang,Robert E. Przekop,Yayun Zhang,Hui Zhou
Gas sources rich in CO2 derived from biomass/waste gasification, anaerobic digestion, or industrial carbon capture often contain impurities such as H2S, H2O, and NH3, which can significantly hinder catalyst performance. Here, we show the role of NH3 on the reverse water–gas shift (RWGS) reaction over a commercial Cu/ZnO/Al2O3 catalyst, examining its effects on both the catalytic activity and the catalyst structure. We found that NH3 reversibly decreases CO2 conversion immediately by suppressing carbonate hydrogenation and CO desorption. This effect intensifies with an increase in NH3 concentration but decreases at higher temperatures. However, prolonged exposure (over 100 h) to RWGS conditions in the presence of 1.4% NH3 leads to near-total and irreversible deactivation of the Cu/ZnO/Al2O3 catalyst. Under NH3 exposure, the catalyst loses Cu+ sites on the surface, causing a spatial separation of Cu and ZnO. Finally, to address this challenge, we propose a novel strategy to mitigate NH3 inhibition by decomposing NH3 into N2 and H2.
研究领域:
化学工程
·
催化科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 20
·16177-16182
·
IF 3.289
Jingjie Su,Zhaodong Li,Yongquan Zhang,Yingjin Wei,Xudong Wang
TiO2-B is a metastable phase of titania with an interesting crystal structure and electrochemical properties. N-Doped and Cu-doped TiO2-B nanowires (NWs) were synthesized by hydrothermal and microwave-assisted hydrothermal methods, respectively. All the NWs are single crystal with the same crystal orientation regardless of the synthesis method and doping situation. The doped NWs together with their corresponding pristine NWs were fabricated into a photoelectrochemical (PEC) anode for water oxidation and their photoactivity performances were studied and compared under different illumination wavelength ranges. The Cu-doped TiO2-B NWs exhibited a significantly higher photocurrent density than all the other samples under direct Xe lamp illumination; while their performance rapidly dropped below the hydrothermal NWs when the UV illumination was cut off. On the contrary, N-doped TiO2-B NWs exhibited significantly enhanced photoactivity particularly in the visible light range. X-ray photoelectron spectroscopy revealed that N-doping could narrow the electronic bandgap of TiO2, while the Cu-doping had little impact on the bandgap but rather improved the electrical conductivity. This research provides a new insight into elemental and phase control of TiO2-based solar energy harvesters.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Du Jinsong,Chen Guanping,Yuan Xinyi,Yuan Jiang,Li Li
Although the potential of metal-organic framework (MOF) nanoparticles as drug delivery systems (DDS) for cancer treatment has been established by numerous studies, their clinical applications are still limited due to relatively poor biocompatibility. We fabricated a multifunctional Cu-MOFs@Keratin DDS for loaded drug and chemodynamic therapy (CDT) against tumor cells. The Cu-MOFs core was prepared using a hydrothermal method, and then loaded with the anticancer drug DOX and wrapped in human hair keratin. The Cu-MOFs@Keratin was well characterized by transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and X-ray photoelectron spectroscopy (XPS). Characterization and pharmacokinetic studies of Cu-MOFs@Keratin were performed in vitro and in vivo. The keratin shell reduced the cytotoxicity and potential leakage of Cu-MOFs to normal cells, and allowed the drug-loaded nanoparticles to accumulate in the tumor tissues through enhanced permeability and retention effect (EPR). The particles entered the tumor cells via endocytosis and disintegrated under the stimulation of intracellular environment, thereby releasing DOX in a controlled manner. In addition, the Cu-MOFs produced hydroxyl radicals (·OH) by consuming presence of high intracellular levels of glutathione (GSH) and H2O2, which decreased the viability of the tumor cells.
研究领域:
生物医学工程
·
纳米医学
·
癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 22
·14072
·
IF 6.208
Shiyue Chen,Yujun Yang,Mingjun Zhang,Xiaohong Ma,Xiaoxiao He,Teng Wang,Xi Hu,Xiang Mao
Dye degradation is a key reaction in organic decomposition production through electron donor transferring. Palladium (Pd) is the best-known element for synthesis Pd-based catalyst, the surface status determines the scope of relative applications. Here we first prepare Pd-Cu alloy nanoparticles (NPs) by co-reduction of Cu(acac)2(acac = acetylacetonate) and Pd(C5HF6O2)2in the presence of sodium borohydride (NaBH4) and glutathione (GSH). The obtained Pd-Cu is about ~10 nm with super-hydrophilicity in aqueous mediums. The structural analysis clearly demonstrated the uniform distribution of Pd and Cu element. The colloidal solution keeps stability even during 30 days. Bimetallic Pd-Cu NPs shows biocompatibility in form of cell lines (IMEF, HACAT, and 239 T) exposed to colloidal solution (50 µg mL−1) for 2 days. It shows the catalytic multi-performance for dye degradation such as methyl orange (MO), rhodamine B (RhB), and methylene blue (MB), respectively. The as-synthesized nanoparticles showed one of the best multiple catalytic activities in the industrially important (electro)-catalytic reduction of 4-nitrophenol (4-NP) to corresponding amines with noticeable reduced reaction time and increased rate constant without the use of any large area support. In addition, it exhibits peroxidase-like activity in the 3, 3′, 5, 5′-Tetramethylbenzidine (TMB) color test and exhibit obvious difference with previous individual metal materials. By treated with high intensity focused ultrasound filed (HIFU), Pd-Cu NPs might be recrystallized and decreased the diameters than before. The enhancement in catalytic performance is observed obviously. This work expedites rational design and synthesis of the high-hierarchy alloy catalyst for biological and environment-friendly agents.Keywords:Pd-Cu NPs;hydrophilic;biocompatibility;catalytic agent;dye degradation
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）