CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Shuaidong Liu,Hongli Liu,Guofu Zhou,Xianggao Li,Shirong Wang
Cu-based perovskite Nanocrystals (NCs) have a bright future in the field of optoelectronics due to their low toxicity, remarkable optical properties and good environmental stability. However, the industrial application is hindered by complex preparation methods. Herein, a facile one-pot method for synthesizing Cs 3 Cu 2 X 5 NCs is proposed. The target Cu-based perovskite NCs were qualified with preferable optical performance, including near-unity PLQY (X = Cl and I), adjustable spectrum from 441 to 556 nm and remarkable environmental stability (retained more than 50% Photoluminescence (PL) intensity for 2 months in air). Density functional theory (DFT) calculations, Time-resolved PL (TRPL) and temperature-dependent PL spectrum were implemented to explore the Self-trapped excitons (STEs) luminescence mechanism and the roots for remarkable optical performance. In addition, crystal phase transformation was observed in water post-treatment from blue light-emitting Cs 3 Cu 2 I 5 NCs to yellow light-emitting CsCu 2 I 3 NCs, relative characterizations were implemented and a plausible reaction mechanism was proposed. Resultantly, a White light-emitting diode (W-LED) constructed by mixing these two phases was endowed with pure white light, which possessed the Commission Internationale de L'Eclairage (CIE) coordinate of (0.32, 0.34), color temperature of 6053 K, color Rendering index (Ra) 0f 91 and maximum luminance of 1558 cd/m 2 . The contribution indicates that Cu-based perovskite NCs prepared by one-pot method have great potential for luminescent applications.
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APPLIED CLAY SCIENCE
·
2021
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IF 5.467
Fushuai Wang,Fei Pan,Guoliang Li,Peiqing Zhang,Ning Wang
Developing cost-effective catalysts for the reduction of carcinogenic and highly toxic 4-nitrophenol to chemical and pharmaceutical intermediate 4-aminophenol has received considerable attention in recent years. Here, spherical montmorillonite (SMt) supported Cu-based catalyst doping with a covalent organic framework (COF) was constructed. Microsized SMt could be easily picked up from the mixture due to its self-sedimentary ability, which could easily solve the recycling issues of catalysts. Furthermore, granular SMt with uniform morphology and structure facilitated supporting and preparing catalysts with homogeneous properties. Moreover, SMt with a large specific surface area was suitable as the substrate for loading catalysts with high content. COF acted as a cocatalyst to accelerate the reaction processing. Cu + /Cu 2+ ions presented considerable catalytic ability for 4-nitrophenol removal due to their electron transferability and low cost. The valence of Cu ions on the prepared catalyst was analyzed and an apparent reduction rate constant ( K app ) of 5.3 min −1 and turnover frequency (TOF) of 955.5 h −1 were obtained at pH = 5 and 40 °C. The mechanism of the pH influence on the catalytic activity of our prepared heterostructure was further investigated. Moreover, the prepared heterostructure could be easily recovered and reused without any devices, and K app could be maintained after being recycled 5 times. Our strategy to fabricate cost-effective heterogeneous catalysts may provide a promising way to apply for these kinds of catalysts.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2019
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IF 4.081
Siyuan Guo,Xiang Zhang,Chunsheng Shi,Enzuo Liu,Chunnian He,Fang He,Naiqin Zhao
Poor mechanical interfacial bonding between graphene nanoplatelets (GNPs) and Cu is unfavorable to the comprehensive properties of the GNPs/Cu composites. Molybdenum carbide coating graphene nanoplatelets (Mo 2 C@GNPs) were prepared by impregnation reduction combined with in situ reaction to improve the interfacial bonding of Cu matrix composites . Compared with GNPs/Cu composites, Mo 2 C@GNPs/Cu composites exhibit excellent mechanical properties . It is due to the fact that Mo 2 C not only improves the interface bonding between the GNPs and Cu matrix, but also increases the strength of composites by dislocation strengthening as nanoparticle reinforcing phase. In addition, the conductivity of Mo 2 C@GNPs/Cu composites is higher than that of GNPs/Cu composites due to the improved interfacial bonding. This work sheds light on adding carbides to control the properties of GNPs/Cu composites.
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Reaction Kinetics Mechanisms and Catalysis
·
2019
·Vol. 128
·期 2
·1065-1077
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IF 1.428
Yu Qifan,Liu Xuesong,Chen Hongfeng,Liu Shuang,Jiang Peng
The regeneration mechanism of sulfated Cu/SAPO-34 catalysts in reducing atmospheres (5% H 2 /Ar and NH 3 /Ar at 600 °C) was investigated by using a series of characterization methods. Hydrogen regeneration improved the catalysts’ NH 3 -SCR activity from 150 to 550 °C remarkably, while ammonia regeneration exhibited relatively less obvious promotion effect. The TPR of hydrogen and EPR spectra data show that the regeneration process affects the amount and the coordination of the active isolated Cu 2+ species significantly. The desulfation increases the amount of isolated copper ions and improves the catalytic activity of SCR.
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ACS Omega
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2019
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IF 2.584
Caidan Zhang,Haidong Li,Qiaozhen Yu,Lin Jia,Lynn Yuqin Wan
Electrospun nanofiber membrane (ENM) with huge specific surface area is an ideal solid substrate for sensors. However, only a few ENMs are developed into colorimetric sensors and it is even more challenging to fabricate multiple-ion-responsive ENM-based colorimetric sensor. In this study, benefiting from the excellent metal ion adsorption ability of poly(aspartic acid) (PASP) and high specific surface area of nanofibers, a reusable colorimetric sensor utilizing PASP electrospun nanofiber hydrogel membrane (ENHM) was designed to detect Cu2+ and Fe3+ in aqueous solution with simple filtration. The sensor based on PASP–ENHM exhibited high sensitivity and selectivity, and colorimetric responses for Cu2+ and Fe3+ detection could be observed by the naked eye. Upon exposure to Cu2+ aqueous solution, the color of the sensor changed from white to blue with a naked eye detection limit of 0.3 mg/L, while it turned from white to yellow with a detection limit of 0.1 mg/L for Fe3+ detection. Furthermore, this sensor was reusable after metal ion extraction by the desorption process.
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PubMed
高影响因子
IONICS
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2019
·Vol. 26
·期 5
·2225-2231
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IF 2.289
Liu Lili,Wang Xiaoyang,Zhang Xiaohong,Zhang Xiuyun,Chen Shimou
Germanium-based materials as anode can improve the capacity of lithium-ion battery because of its excellent lithium-ion storage ability. But the application of Ge anode is hampered by the huge volume variation during de/lithiation processes. Herein, a Ge/Cu wire mesh (Ge/Cu-WM) electrode is prepared by ionic liquid electrodeposition, where the Ge nano-film is deposited on Cu wire mesh. The unique structure of Ge/Cu-WM electrode not only buffers the volume expansion but also enhances electron migration and electron transport during lithiation. The Cu 3 Ge is observed by XRD, which confirms that the Ge nano-film tightly attach to the Cu wires. All structural properties give the electrode excellent electrochemical performance, where a capacity of 633 mAh/g after 100 cycles at 0.1 C is obtained. The reasonable structure and improved cycling stability make Ge-based anodes highly attractive for lithium-ion battery applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Guangpeng Yang,Xuesen Du,Jingyu Ran,Xiangmin Wang,Yanrong Chen,Li Zhang,Vladislav Rac,Vesna Rakic,John Crittenden
SCR activity of Cu-SAPO-34 catalyst was reduced by alkali metal ions. The alkali metals ions (Li + , Na + and K + ) have shown irregular influences on Cu-SAPO-34. The order of poisoning strengths under 400 °C was found to be: Na + > K + > Li + , which is not consistent with the basicities of their corresponding metals. Experimental results and calculations showed that the alkali metal ions readily replace H + and Cu 2+ /Cu + ions. These exchanges result in the loss of Brønsted acid sites and migration of isolated Cu 2+ ions in Cu-SAPO-34, which decrease the NH 3 -SCR activity. Both the basicity and ion diameter will affect the exchanging behavior of an alkali ion. Na + and Li + ions will influence both H + and Cu 2+ /Cu + ions but K + ions only preferably replace the H + . We hypothesize that K + cannot enter into a small ring (6-membered ring) to replace a Cu 2+ /Cu + ion because of its large ion diameter. The displaced Cu 2+ /Cu + ions will transfer to adjacent unbonded Al site to form a CuAlO 2 species.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Shuo Wang,Lirong Zhao,Rui Xu,Yanqing Ma,Lei Ma
Copper nanoparticles modified as-grown monolayer and bilayer graphene on copper substrates have been used for non-enzymatic electrochemical glucose sensing. The high quality, continuous, full coverage graphene on copper substrate act as a good electrochemical electrode which obviating the tedious transfer processes. The present sensor shows excellent performance for glucose detection including a wide linear range of 0.02–2.3 mM, a low detection limit (1.39 μM, S/N = 3), high sensitivity (379.31 μA mM −1 cm −2 ), fast response time (＜5 s), good selectivity to the general coexisted interferences, reliable stability, etc. We believe this kind of electrode has a great potential for practical glucose sensing applications and also promise for other biomolecules detection.
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ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Xu Dong,Lukas Ohnoutek,Yang Yang,Yiqing Feng,Tao Wang,Muhammad Ali Tahir,Ventsislav K. Valev,Liwu Zhang
Surface enhanced Raman spectroscopy (SERS) shows great promise in studying individual atmospheric aerosol. However, the lack of efficient, stable, uniform, large-array, and low-cost SERS substrates constitutes a major roadblock. Herein, a new SERS substrate is proposed for detecting individual atmospheric aerosol particles. It is based on the sphere segment void (SSV) structure of copper and silver (Cu/Ag) alloy. The SSV structure is prepared by an electrodeposition method and presents a uniform distribution, over large 2 cm2 arrays and at low cost. The substrate offers a high SERS enhancement factor (due to Ag) combined with lasting stability (due to Cu). The SSV structure of the arrays generates a high density of SERS hotspots (1.3 × 1014/cm2), making it an excellent substrate for atmospheric aerosol detection. For stimulated sulfate aerosols, the Raman signal is greatly enhanced (>50 times), an order of magnitude more than previously reported substrates for the same purpose. For ambient particles, collected and studied on a heavy haze day, the enhanced Raman signal allows ready observation of morphology and identification of chemical components, such as nitrates and sulfates. This work provides an efficient strategy for developing SERS substrate for detecting individual atmospheric aerosol.
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PubMed
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POWDER TECHNOLOGY
·
2020
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IF 4.142
Jian-Rong Li,Feng-Kang Wang,Chi He,Cenyan Huang,Hang Xiao
A series of carbon-supported Cu Co oxide catalysts (Cu-Co/C) were prepared via the combination methods of impregnation and pyrolysis using Co-doped Cu-based metal organic framework (Cu 3 (BTC) 2 ·3H 2 O, Cu-BTC) precursor. Physicochemical properties of prepared catalysts were characterized by using various technologies and toluene was chosen as the probe molecule to evaluate their catalytic performance. Results revealed that the successive calcination in Ar and air was conducive to the formation of 3D porous carbon matrix and homogeneous elemental dispersion. The Cu-Co/C catalysts with spinel structure exhibited higher catalytic activity than that of Cu-500/C material. Moreover, CuCo 0.5 /C material exhibited superior catalytic durability and water resistance in catalytic oxidation of toluene. The excellent catalytic performance of CuCo 0.5 /C was mainly related to large specific surface area, high amounts of surface chemisorbed active oxygen and high ratio of Co 2+ /Co 3+ .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Ziyun Xu,Shiqi Weng,Chenhui Li,Ming Jin,Decheng Wan
Aminopolycarboxylic acids (APAs) show a strong affinity toward heavy metal species, but straightforward and robust studies on the surface of porous adsorbents with APAs are rarely available. In this study, branched polyethyleneimine (PEI) is directly used to investigate the surface of a microcrystalline cellulose (MC)-supported porous monolith (MC@PEI) through an oil-in-water high internal phase emulsion technique. The residual amines of the covalently immobilized PEI are transformed into dense APAs (MC@PEI-APA). The open-cellular MC@PEI-APA monolith can effectively eliminate trace Cu(II) or Zn(II) from water relative to MC@PEI. Moreover, its adsorption complies with the second-order kinetics and follows the Langmuir adsorption model. MC@PEI-APA shows high adsorption capacities (e.g., 96 mg g −1 for Cu(II)). It also presents stronger metal affinities than the commercial Amberlite IRC-748 adsorbent possibly because of the cooperative ligation of metal species by the relatively dense APA groups of MC@PEI-APA. The proposed adsorbent is durable and has good recyclability.
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ELECTROANALYSIS
·
2019
·Vol. 31
·期 6
·1002-1008
·
IF 2.691
Baolong Ma,Hao Guo,Mingyue Wang,Li Li,Xueyan Jia,Huiqin Chen,Rui Xue,Wu Yang
A nanocomposite of HKUST-1 (MOF) and electroreduction graphene oxide (ERGO) is prepared and applied as an electrochemical sensor for the simultaneous determination of paracetamol and dopamine by means of one-step electrodeposition. The MOF/ERGO composite displays excellent electrochemical catalytic activities towards the paracetamol and dopamine, which is attributed to the synergistic effect of big surface area, porosity and high electrocataytic activity of the MOF and good conductivity of ERGO. The modified electrode could be applied to determine simultaneously paracetamol and dopamine in biochemical samples with wide linear ranges (0.2 μM to 160 μM for paracetamol and 0.2 μM to 300 μM for dopamine) and low detection limits (0.016 μM for paracetamol and 0.013 μM for dopamine). Meanwhile, the proposed sensor still displays high sensitivity, good selectivity and excellent stability.
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