Frontiers in Chemistry
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2020
·
IF 3.693
Zhou Xinfeng,Qi Weihong,Yin Kai,Zhang Ning,Gong Shen,Li Zhou,Li Yejun
Highly efficient and low-cost non-noble metal based electrocatalysts for oxygen evolution reaction (OER) have attracted more and more attention in recent years. However, the current research has been focused on the construction of novel OER electrocatalysts themselves, little attention has been paid to the modification of the substrates. In this work, a different strategy is proposed via laser ablation to fabricate the Cu foams with rich micro/nano-structures as OER substrates. Later, the precipitation conversion method was utilized to grow cobalt hydroxide on the laser fabricated Cu foams. The as-produced Cu/Cu oxides/Co(OH)2 electrocatalysts exhibit high OER activity in 1 M KOH, requiring an overpotential of only 259 mV at a current density of 50 mA cm−2 with excellent mild-term durability. The improved catalytic performance of the prepared samples can be attributed to the increased surface area, rich active sites, and the superhydrophilicity of the laser produced micro/nano-structures.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 32
·325502
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IF 3.551
Nianfeng Shi,Shupei Sun,Bo Zhang,Qian Du,Yanxin Liao,Xiaoming Liao,Guangfu Yin,Zhongbing Huang,Ximing Pu,Xianchun Chen
Co(OH)2 nanosheets/Cu(OH)2 nanorods composite electrodes for non-enzymatic glucose detection were fabricated by electrodepositing Co(OH)2 nanosheets on Cu(OH)2 nanorods substrate grown directly on the copper sheet via a simple one-step reaction. The Co(OH)2 nanosheets/Cu(OH)2 nanorods composite electrode was characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The glucose sensing performance of the composite electrode was investigated by cyclic voltammetry and chronoamperometry. The composite electrode shows high sensitivity of 2366 µA mM−1 cm−2 up to 2 mM with a lower detection limit of 0.17 mM (S/N = 3). The composite electrode is highly selective to glucose in the presence of various substances that always co-exist with glucose in real blood samples. The response of the composite towards human blood serum was in good agreement with that of commercially available glucose sensors, suggesting that a promising electrode material for highly sensitive and selective non enzymatic detection of glucose can be envisioned.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Zinashbizu Mengesha Ayalew,Xiangyuan Zhang,Xuejun Guo,Sana Ullah,Siwen Leng,Xiaoyan Luo,Na Ma
Traditional chemical precipitation generates a large volume of sludge required by further hazardous waste disposal. For reducing this drawback, four oligo-ethyleneamine dithiocarbamates (OEDTC), including ethylenediamine-dithiocarbamate (E 1 -DTC), diethylenetriamine-dithiocarbamate (E 2 -DTC), triethylenetetramine-dithiocarbamate (E 3 -DTC) and tetraethylenepentamine-dithiocarbamate (E 4 -DTC) were synthesized to remove Cu, Ni and Zn directly from acidic wastewater. Based on S dose, which was an essential element for metal removal, the treatment effectiveness order of the four OEDTC for Cu and Ni was E 1 -DTC > E 2 -DTC > E 4 -DTC > E 3 -DTC. The theoretical molar ratios of S toward Cu, Ni and Zn for the completed metal removal from single component were 1.5:1, 2:1, 2.2:1 for E 1 -DTC; 2:1, 2.6:1, 2.9:1 for E 2 -DTC; 2:2, 3:1, 3.9:1 for E 3 -DTC; and 2:1, 2.7:1, 2.8 for E 4 -DTC, respectively. The four OEDTC had marked preference for Cu over Ni and Zn from multiple components of simulated wastewater. They showed high removal efficiency for the complex-formed Ni and Zn from actual electroplating wastewater, yielding the effluent residual 0.003–0.008 and 0.021–0.046 mg/L, respectively. When the four OEDTC were precipitated with the three metals, FT-IR suggested the coordination of metals with S and SEM indicated densely packed particle formation. The yielded OEDTC-metals sludge enriched with heavy metals exhibited potential to be recycled.
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Journal of CO2 Utilization
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2020
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IF 5.993
Guangyong Shi,Wei Xu,Jichao Wang,Ye Yuan,Somboon Chaemchuen,Francis Verpoort
The coordination of pyridylcarboxylate (isonicotinic acid, IN) with copper (II) fabricates a Cu(IN)-MOF. The characteristic properties of the Cu(IN)-MOF are obtained via different analysis techniques such as XRD, SEM, BET, ICP, TG, etc. The advantage of copper(II) coordinated with a bi-functional organic linker (IN), containing a pyridyl and carboxylate group, is demonstrated by the chemical properties of which the Cu(II)-based MOF exhibits excellent catalytic performance for the CO 2 carboxylation of terminal alkynes. No noble-metal, co-catalyst, or additives are required to execute the reaction. The effectiveness of the Cu(IN)-MOF was demonstrated with a variety of substrates (>11). Moreover, the Cu(IN)-MOF, as a heterogeneous catalyst, can be recycled at least 5 times retaining its excellent catalytic performance. Herein, we report the first copper (II) metal-organic framework (Cu(IN)-MOF) applied for the carboxylation of alkynes with CO 2 demonstrating several advantages such as stable catalyst, avoiding the use of an expensive noble-metal, straightforward synthesis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Li Wang,Lili Cui,Xin Ge,Nailin Yue,Xingquan He,Wei Zhang,Tewodros Asefa
Developing efficient nonprecious electrocatalysts that can drive the oxygen electrode reactions in zinc-air batteries (ZABs) is important but remains challenging. In this work, novel materials comprising Mn/Cu nanoclusters-grafted N-doped carbon nanotubes are synthesized by preparing and then pyrolyzing Mn/Cu polyphthalocyanine-encapsulated carbon nanotubes (CNTs), followed by treating the products with acidic solution. The materials are named CNTs@(Mn,Cu)PPc-T, where T denotes the pyrolysis temperature in °C, and they are demonstrated to serve as efficient oxygen electrode catalysts for zinc-air batteries (ZABs). Among them, the one synthesized at 900 °C, CNTs@(Mn,Cu)PPc-900, requires more positive onset and half-wave potentials for reduction of oxygen and a low overpotential for the evolution of oxygen. A rechargeable ZAB assembled with CNTs@(Mn,Cu)PPc-900 electrocatalyst delivers a high power density (158.5 mW cm −2 ) and displays an excellent stability in 200 cycles of charge/discharge (in over 33 h). Such performance is even superior to that of a ZAB containing the benchmark Pt/C + RuO 2 catalyst as an air cathode under identical testing condition.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Ying Gao,Yihui Wu,Hanwei He,Wenyu Tan
Development of cost-effective and efficient earth-abundant catalysts for hydrogen evolution reaction (HER) is a great challenge. In this study, by one-step potentiostatic electrodeposition, the Ni–Se–Cu electrocatalyst on nickel foam was fabricated as a binder-free HER electrocatalyst. As compared with Ni–Se electrocatalysts, such fabricated Ni–Se–Cu electrocatalyst exhibited prominent electrocatalytic activity to the HER in alkaline electrolyte. This Ni–Se–Cu electrocatalyst exhibits a small overpotential of 136 mV to achieve a current density of 10 mA·cm −2 and high electrochemical stability. The remarkable HER properties of Ni–Se–Cu electrocatalyst mainly originate from high electronic conductivity induced by Cu-doping. This work shows a cheap and simple avenue to develop high efficient non-noble electrochemical electrocatalysts for HER.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Shanshan Xu,Xiangyu Guo,Zhihua Qiao,Hongliang Huang,Chongli Zhong
Cu-BTC is a copper paddlewheel-based metal–organic framework (MOF) with great potential in gas adsorption and heterogeneous catalysis but has restricted practical applications because of its poor water stability. In this work, we propose a strategy for one-step synthesis and in situ functionalization of isopropanol (IPA)-modified Cu-BTC (Cu-BTC-IPA) with enhanced water stability. Successful incorporation of IPA into Cu-BTC was evidenced by proton nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy spectra. The introduction of methyl groups around unsaturated Cu sites can form a methyl-shielding microenvironment, endowing Cu-BTC-IPA with the ability to maintain the topology structure after being immersed in water even for 4 days. After soaking, Cu-BTC-IPA can preserve 95% of its original Brunauer–Emmett–Teller (BET) surface areas and 90% of its initial CO2 adsorption capacity, while Cu-BTC completely lost its crystallinity. In addition, Cu-BTC-IPA managed to preserve its main crystal structure and 83% of its initial BET surface areas after 12 h of immersion in diluted HCl solution (pH = 3). The improved hydrolysis stability mechanism of Cu-BTC-IPA was investigated using density functional theory calculations. The results suggest that the strategy of incorporating IPA into Cu-BTC is very efficient in enhancing its structure stability against water and worthy of further exploitation in improving the structure stability of other MOFs with open metal sites.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Ying Wang,Jian He,Pan Wu,Dingyuan Luo,Runhua Yan,Hao Zhang,Wei Jiang
In this study, a common refractory aquaculture hybrid wastewater containing copper and tetracycline (TC) was treated to simultaneously remove such pollutants through a formic-acid-assisted photocatalysis process with TiO2 as the photocatalyst. The results show that pure aqueous TC can be completely photodecomposed by TiO2, although the removal rate of pure Cu ions through photocatalysis without the addition of a scavenger can be neglected. For simultaneously photodegrading TC–Cu(II) hybrid wastewater, the TC degradation rate is accelerated, whereas the Cu(II) removal rate remains at 20% through adsorption. TC cannot promote the photoreduction of Cu(II) as a sacrificial agent, and its intermediate products form a stable complex with Cu(II), hindering further reduction. The addition of formic acid effectively releases Cu ions from the complex as a pH regulator and enhances the photocatalysis process as a hole scavenger. Through the addition of formic acid after complete TC photooxidation, the final chemical oxygen demand (COD) and Cu concentration were only 8 and 0.4 mg/L, respectively. This study provides a simple and promising method for simultaneously treating TC–Cu(II) hybrid wastewater using formic-acid-assisted TiO2 photocatalysis.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Xiu-Fang Huang,Bing-Xue Ren,Chi-Fang Peng,Xin-Lin Wei,Zheng-Jun Xie
In this study, the fluorescence enhancement effect of guanine base on DNA-Cu/AgNCs was reported and fluorescent methods for the determination of Hg 2+ or Cu 2+ ion were established. The effect of adjacent and inserted guanine base (G) sequences in DNA template on the fluorescence intensity of DNA-Cu/AgNCs was investigated. It was found that G 5 sequence extended from the 5′ end of a typical C-riched DNA strand, 5′-CCCTTAATCCCC-3′ (DNA1), demonstrated fluorescence enhancement effect in the preparation of the DNA-Cu/AgNCs. Moreover, this G5-DNA-Cu/AgNCs can be used to determine Hg 2+ and Cu 2+ ions due to fluorescence quenching by the two metal ions while the DNA1-Cu/AgNCs only can determine Hg 2+ ions. Specific assays for Hg 2+ ions and Cu 2+ ions were established through masking Cu 2+ ions by EDTA and Hg 2+ ions by NaBH 4 , respectively. In Hg 2+ determination, a linear range from 5.0 nM to 40 nM was obtained with a detection limit of 1.0 nM. In Cu 2+ determination, a wide linear range from 0.01 µM to 5.0 µM was obtained with a detection limit of 5.0 nM. The recoveries of 89.6–106.8% for Cu 2+ ions and 90.6–106.2% for Hg 2+ ions were obtained in the measurements of Hg 2+ and Cu 2+ ions spiked lake samples, respectively. The results indicate the potential application of the DNA-Cu/AgNCs as a metal ions probes in real samples.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Nan Zhang,Qingkui Li,Kaijun Yang,Hailong Wang,Jinpeng Zhu,Zhuang Ma,Lihong Gao,Yanbo Liu,Yang Liu,Jilin He
Core-shell structured cermet powders with thermal conductivity anisotropy have been brought into focus because they have a great potential application as the horizontal thermal diffusion layer material in multilayer thermal protective coating (TPC). In this contribution, core-shell structured YSZ@Cu cermet powders were fabricated by electroless deposition (ED) of Cu on yttria-stabilised zirconia (YSZ) powder. The surface of YSZ powder was uniformly coated with a thin Cu shell of approximately 2 μm. Through X-ray photoelectron spectra (XPS) analysis, it was found that trace CuO and Cu 2 O oxides formed on the surface of Cu shell. Results of thermal spraying adaptability analysis show the flowability of core-shell structured YSZ@Cu cermet powder improved to 56.8 s/50 g, which conforms better to the basic requirements of thermal spraying material. By differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests, the YSZ@Cu powder had good thermal stability. In particular, between 25 and 500 °C, the anisotropy thermal conductivity rose higher than 1.8 and it remained stable at approximately 1.6 with temperature as high as 900 °C. All these features promise it a high-performance thermal conductivity anisotropy material.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 48
·15285-15291
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IF 6.641
Mingrui Liu,Lijin Wang,Zhongyuan Guan,Zhenyang Liu,Yongsheng Zhu,Aiwei Tang
The optical properties of doped semiconductor nanocrystals (NCs) are strongly affected by the dopant position inside the host lattice. However, controlling the dopant position in Cu(I) doped core/shell semiconductor NCs is still unexplored due to the high ionic mobility of Cu(I) ions at the doping temperature. In this paper, we report the doping of Cu(I) ions into CdS/ZnS core/shell NCs via a cation exchange strategy. During the doping, the exciton emission of CdS NCs is reduced and the dopant emission becomes intensified as the doping level is increased from 0 to 1.1%, and the PL profile of the final product is very similar to that of uncoated CdS:Cu(I) NCs. Such an optical change is very different from that observed in the products synthesized by a conventional method, in which no exciton emission of CdS NCs is observed. During the Cu(I) doping process, the variation of the dopant emission may arise from the doping position change from the outside ZnS shell to the inside CdS core in the CdS/ZnS core/shell NCs. The deduction can be further verified by the optical change by direct heating of a small amount of Cu(I) doped CdS/ZnS NCs in a non-coordinating solvent. This work offers a cation exchange strategy for fabricating Cu(I) doped core/shell NCs with tuned dopant positions, which will open up rich opportunities for tuning the optoelectronic properties of Cu(I) doped semiconductor NCs.
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Molecular Catalysis
·
2019
·
IF 2.938
Xin Li,Haixing Wang,Peiyong Sun,Shenghong Zhang,Zhilong Yao
Cu/ZrO 2 catalysts with or without boron modification were prepared, characterized, and evaluated in the hydrogenation of sec -butyl acetate (SBA) to 2-butanol. Cu/ZrO 2 catalysts were active for the hydrogenation of SBA but suffered serious deactivation due to the leaching of Cu. Introduction of boron onto Cu/ZrO 2 catalysts improved the dispersion of Cu species, the surface Cu + /Cu 0 ratios, and the catalyst stability owing to the enhanced interaction between Cu species and support. However, it decreased the intrinsic activity of Cu towards the hydrogenation of SBA and complicated the reaction network by accelerating acid-catalyzed isomerization and transesterification processes as a result of the strengthened acidity by boron. A further kinetic analysis unravelled that the reaction orders for SBA and H 2 are 0.58 and 0.83, respectively, and the apparent activation energy is 47 kJ/mol. Such understanding of the structural evolution of CuB/ZrO 2 catalysts and the consequent catalytic performances with the B contents may provide insights useful for the design of Cu catalysts with desirable stability for hydrogenation of SBA and other esters.
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