INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Zihao Zhang,Zehua Pei,Hao Chen,Kequan Chen,Zhaoyin Hou,Xiuyang Lu,Pingkai Ouyang,Jie Fu
Al2O3-supported Cu and Ni monometallic as well as Cu–Ni bimetallic catalysts were synthesized using a coprecipitation method and studied for the in-situ hydrogenation of furfural (FAL) with isopropanol as the solvent and hydrogen donor. The Cu–Ni bimetallic catalysts showed improved activity toward the production of 2-methylfuran (2-MF) and 2-methyltetrahydrofuran (2-MTHF) over that of monometallic catalysts. The results indicated that isopropanol exhibited better performance than methanol for the in-situ hydrogenation of FAL to produce 2-MF and 2-MTHF under the same conditions. The reaction conditions such as the copper–nickel ratios, catalyst loading amount, reaction temperature, and time were optimized. After the reaction was complete, the supported Cu–Ni bimetallic catalyst could be reused four times without a significant loss in catalytic activity.
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ChemCatChem
·
2018
·Vol. 10
·期 18
·4010-4017
·
IF 4.674
Kui Ma,Zhonghui Cui,Zhitao Zhang,Jingjing Huang,Zhirui Sun,Ye Tian,Tong Ding,Xingang Li
Graphical Blowing off steam : This paper describes a new approach of designing Cu−Ni bimetallic catalytic systems for dimethyl ether/methanol steam reforming. The Cu−Ni system exhibits an interesting alloy-mediated selectivity of CO and CH 4 , thereby producing hydrogen-rich reformates with an ultra-low CO concentration (<1000 ppm), which could be commercially potential for fuel cells. Steam reforming of simple oxygenated hydrocarbons without C−C bonds is suitable for small-scale decentralized H 2 production for fuel cells. However, the relatively high CO concentration in H 2 -rich reformates produced by traditional Cu-based catalysts will poison the Pt-based anode in fuel cells. Here, we describe a new approach to the design of Cu−Ni bimetallic catalysts based on nickel-phyllosilicate for steam reforming of dimethyl ether (DME). With the tunable formation of the Cu−Ni alloy, we can modulate the selectivity of CO and CH 4 in steam reforming and achieve H 2 -rich reformates with an ultra-low concentration of CO (below 1000 ppm). This process only requires simple and low-energy purification pretreatments to meet the requirements of commercial fuel cells. Mechanistic studies reveal that the Cu−Ni alloy can adsorb CO, particularly at high temperatures, and simultaneously suppress CO dissociation to methane.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 7
·5954-5960
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IF 2.324
Wang Yan,Wang Yishu,Han Jing,Tan Shihai,Guo Fu
Sn grain orientation in solder matrix has recently been considered as one of the principal failure contributions in lead-free solder joints. Since β -Sn exhibits high anisotropy, the differences of electromigration behavior of solder joints with various grain orientations are dramatic. With different angle ( θ ) between the c -axis of Sn grain and the direction of electron flow, the solder joints often demonstrate varying degrees of electromigration-induced damage. The present investigation illustrated significant differences in microstructural features on the surface of Cu reinforced composite solder joints, even with similar angle θ . Two Cu particles reinforced Sn 3.5 Ag composite solder joints with the similar angle θ of 35° and 40° were selected to investigate the effects of Sn grain c -axis on electromigration under high current stressing for 528 h. A large number of Cu 6 Sn 5 compounds were observed and occupied nearly the whole surface with clear polarization effect in one sample. In contrast, very few Cu 6 Sn 5 were found on the surface of the solder matrix in the other sample after current stressing, and the Cu 6 Sn 5 which was formed after reflow disappeared with subsequent current stressing. Even though polarization effect was not obvious, and the cathode interfacial dissolution was observed on such sample. Systematic study revealed that the angle θ alone was not a sole factor to determine the electromigration damage. It has to be considered along with the coordinate system containing the orientation of the c -axis of the Sn grain, a more dominative factor for the diffusing species.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Yu Zhu Yang,Na Xiao,Yu Yan Cen,Jing Rong Chen,Shi Gang Liu,Yan Shi,Yu Zhu Fan,Nian Bing Li,Hong Qun Luo
Copper is an essential mineral nutrient for the human body. However, excessive levels of copper accumulated in the body can cause some diseases. Therefore, it is great significant to establish a sensitive bioprobe to recognize copper ions (Cu 2+ ) in vivo. In our work, nitrogen-doped carbon dots (N-CDs) and gold nanoclusters (Au NCs) are selected as luminescent nanomaterials and the Au NCs/N- CDs nanohybrids is successfully synthesized by coupling method. The Au NCs/N-CDs exhibited characteristic dual-emission peaks at 450 and 620 nm when excited by a single-wavelength of 380 nm. When different amounts of Cu 2+ are introduced, the fluorescence intensity of the Au NCs is gradually weakened and fluorescence intensity of the N-CDs is almost unchanged, which can facilitate the visual detection of Cu 2+ . The Au NCs/N-CDs nanohybrid possesses good selectivity to Cu 2+ with a limit of detection (LOD) is 3.5 μM and linear detection range of 10–150 μM. Visualization detection of Cu 2+ is implemented by using nanoprobe in water samples. Furthermore, the ratiometric nanoprobe is utilized to the toxicity test of liver cancer cells, indicating excellent biocompatibility and low toxicity. This nanoprobe has been used to the intracellular fluorescence imaging. Moreover, this method is expected to be used to monitor the changes of Cu 2+ concentration in hepatocytes.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 37
·11632-11638
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IF 6.641
Wenjuan Lei,Yongsheng Yu,Weiwei Yang
Here, we report simple one-step solution phase synthesis for face-centered tetragonal FePtCu nanoparticles (NPs). Cu atoms are doped into the FePt lattice during synthesis, occupying Fe sites to form FePtCu alloy NPs. The phase and magnetic properties of the NPs can then be altered by varying the reaction conditions. We report room-temperature coercivities as high as 5.09 kOe for FePtCu NPs synthesized at 310 °C, significantly higher than the coercivity of pure FePt NPs without Cu doping. We suggest that Cu incorporation into the FePt lattice is responsible for the observed ordering enhancement of the as-prepared NPs, specifically increasing atomic diffusivity during the fcc-to-fct phase transformation. Our findings provide critical insights the effects Cu doping, namely its role in inducing atomic rearrangement and phase transformation of FePt NPs at low synthesis temperatures.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 4
·3922-3932
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IF 2.741
Yi Xiaofeng,Yang Meixia,Mo Liuda,Xu Wenkai,Wang Shuai,He Jiarui,Gu Junjie,Ou Minrui,Xu Xiaoping
Copper in drinking water causes a significant environmental problem. Composite material based on alginate hydrogel has been gaining attention in the field of Cu(II) adsorption. However, alginate-based hydrogel exhibits poor mechanical property and relative low adsorption capacity which limit their application. The present study is devoted to the modification of chitosan/calcium alginate/Fe 3 O 4 (CAF) hydrogel microsphere by NaOH solution for enhancement of Cu(II) adsorption. Results reveal that modification of CAF via NaOH solution significantly improves the mechanical strength and Cu 2+ adsorption capacity of pristine materials. FTIR and XRD analysis confirms that CAF and newly prepared materials (NACAF) are successfully prepared. SEM and EDX are employed to analyze the surface morphology and elemental composition, respectively, both before and after their loading with Cu 2+ . XPS study demonstrates adsorption mechanism is based on chelation and ion-exchange. Compressive stress-strain curves demonstrate NACAF has better mechanical performance than CAF. The adsorption kinetics of the two adsorbents follow a pseudo-second-order model. The equilibrium data were best described by Langmuir isotherm model, and the estimated maximum equilibrium sorption capacity, q
m ,is 261.31 mg/g for the NACAF, which is larger than that of CAF (145.39 mg/g). Hence, NACAF shows excellent mechanical strength and high sorption capacity for Cu 2+ . It has great potential for Cu(II) removal in aqueous solutions.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Tianyun Jing,Shaokang Yang,Tingting Li,Yangyang Wan,Huimin Jia,Yonghai Feng,Yunpeng Zuo,Dewei Rao
Atomic scaling of cobalt-based catalysts is the feasible and sustainable approach for selective oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) to produce bio-plastic monomer of 2,5-furandicarboxylic acid (FDCA) under mild conditions. Here, a high-efficiency dual single-atomic Co/Cu supported on nitrogen-doped carbon (a-Co/Cu-NC) is constructed. Leveraging exceptional oxygen activation ability, the Co/Cu dual-atomic-sites can accelerate the HMF oxidation, suppressing by-product formation mediated by reactive oxygen species (ROS) in low-oxygen environments. This leads to enhanced FDCA selectivity with a yield of 98% and a production rate of 298.8 mmol FDCA g metal −1 h −1 under ambient conditions. Comprehensive experiments and density functional theory (DFT) calculations demonstrate that long-range interactions between Co and Cu sites optimize reactant adsorption and lower energy barriers for •O 2 − and HMFCA formation.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 26
·10919-10927
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IF 3.5
Xuanzhao Lu,Baozhen Yuan,Yi Liu,Li-Xia Liu,Jun-Jie Zhu
Electrochemical reduction of carbon dioxide (CO2) or carbon monoxide (CO) to valuable multi-carbon (C2+) products like acetate is a promising approach for a sustainable energy economy. However, it is still challenging to achieve high activity and selectivity for acetate production, especially in neutral electrolytes. Herein, a bioinspired hemin/Cu hybrid catalyst was developed to enhance the surface *CO coverage for highly efficient electroreduction of CO to acetate fuels. The hemin/Cu electrocatalyst exhibits a remarkable faradaic efficiency of 45.2% for CO-to-acetate electroreduction and a high acetate partial current density of 152.3 mA cm−2. Furthermore, the developed hybrid catalyst can operate stably at 200 mA cm−2 for 14.6 hours, producing concentrated acetate aqueous solutions (0.235 M, 2.1 wt%). The results of in situ Raman spectroscopy and theoretical calculations proved that the Fe–N4 structure of hemin could enhance the CO adsorption and enrich the local concentration of CO, thereby improving C–C coupling for acetate production. In addition, compared to the unmodified Cu catalysts, the Cu catalysts functionalized with cobalt phthalocyanine with a Co–N4 structure also exhibit improved acetate performance, proving the universality of this bioinspired molecule-enhanced strategy. This work paves a new way to designing bioinspired electrolysis systems for producing specific C2+ products from CO2 or CO electroreduction.
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FOOD HYDROCOLLOIDS
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2024
·
IF 11
Peini Li,Yiqing Deng,Wangcai Zou,Zhenqiao Ma,Xiandi Yang,Qiang Zhao
As living standards improve, the demand for food freshness has gradually increased. Multifunctional packaging materials that monitor food freshness in real-time, delay spoilage, and are environmentally friendly have emerged as ideal solutions. This study synthesized an ammonia-sensitive copper-based metal-organic framework (Cu-MOF) and incorporated it into a matrix composed of chitosan (CS) and gelatin (Gel). The resulting film exhibits ammonia-sensitive color-changing properties, antibacterial activity, and excellent biodegradability. The effects of Cu-MOF incorporation on the structural, physical, and functional properties of the CS/Gel films were systematically evaluated. Results demonstrated that the Cu-MOF was uniformly distributed within the CS/Gel matrix, significantly enhancing the mechanical properties (tensile strength increased by 68.49%), oxygen/water vapor barrier properties, and UV-blocking capability of the films. Notably, the CS/Gel@Cu-MOF films exhibited excellent antibacterial performance, with sterilization rates of 94.2% against Escherichia coli and 99.6% against Staphylococcus aureus . Additionally, the films showed good biocompatibility, biodegradability, and a sensitive color response to ammonia. The films were successfully used to monitor shrimp freshness through color change, transitioning from light green to brown as spoilage occurred. These findings indicate that CS/Gel@Cu-MOF films have significant potential for real-time visual freshness monitoring in food packaging, contributing to reduced food safety risks and waste.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Fu Li,Qian Huo,Xiaomei Zhou,Shasha Fang,Fei Han,Jingnan Yang,Qingxin Guan,Wei Li
Photothermal CO 2 into methanol is an effective approach to address energy and environmental challenges, but the low conversion and poor selectivity limit its large-scale application. Here, 0.5Cu@CeO 2 with atomically dispersed active sites and abundant Frustrated-Lewis-pairs (FLPs) was synthesized using coordination complex precipitation reaction. The substitution of Cu 2+ with Ce 3+ results in the formation of new FLPs, which promotes the upward shift of conduction band (CB) and enhances the reducing capability of catalyst. Moreover, the more sensitive and stronger capability of photogenerated carriers also endows 0.5Cu@CeO 2 with stronger CO 2 reduction capability. The photothermal methanol yield of 0.5Cu@CeO 2 reached 1896.02 μmol·g cat –1 ·h –1 . The DFT results demonstrate the FLPs structure of 0.5Cu@CeO 2 promotes parallel adsorption of CO 2 and *CO species. Meanwhile, the presence of O v inhibits the dissociation of oxygen species, consequently boosting the methanol synthesis. The construction of FLPs structure introduces a novel method to enhance CO 2 conversion utilizing photothermal catalysis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Siyuan Luo,Haiyuan Zou,Renji Zheng,Shimao Deng,Xuezhen Feng,Wenfei Wei,Ranhao Wang,Ze Li,Wei Xu,Lele Duan,Hong Chen
Selective electrochemical reduction of CO 2 /CO to high-valuable C 2+ products is of great importance to alleviate the global warming and energy crisis problems, while the selective production of C 2 is severely limited by the C C coupling pathway on the catalyst interface. Herein, by employing a Cu + /Cu 2+ charge-ordered metal-organic framework (MOF) material (denoted to be Cu4BHT) as a CO electroreduction catalyst, a high acetate selectivity of 50.3% at 0.7 V versus reversible hydrogen electrode (RHE) has been achieved. An in-depth mechanism study reveals that the charge-ordered Cu + /Cu 2+ pair on Cu4BHT interface favors the C O bond activation, C C coupling, and proton-coupled electron transfer dynamics, which results in the selective formation of C 2+ products. This work illustrates the critical role of employing charge-ordered Cu + /Cu 2+ catalytic site pair for C C coupling, which paves the way for designing highly selective catalysts to promote the formation of the C 2 products.
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AICHE JOURNAL
·
2025
·
IF 4
Hui Wang,Yifan Jin,Yaxin Jin,Siyu Kuang,Tianxiang Yan,Xinyue Wang,Xiao Wang,Wenquan Cui,Sheng Zhang
Electrochemical carbon dioxide reduction reaction (CO 2 RR) is one of the most prospective strategies to achieve carbon neutrality. Multi-carbon compound (C 2+ ) products have higher commercial value and wider applications, among which ethanol is a widely used chemical feedstock and high energy density fuel. Here, we prepared nitrogen-doped carbon nanofibers containing copper-zinc double atoms using the electrospinning technique and controlled the content of both metal atoms by varying the calcination temperature. This catalyst exhibited ultra-high selectivity for ethanol at low potentials. Ethanol selectivity at −0.3 V versus RHE was more than 60% with the total alcohol selectivity of over 80%. Meanwhile, we explored the ethanol production pathway by combining density-functional theory (DFT) and ATR-FTIR spectroscopy, and found that OCCO* intermediates were most abundant for the optimal ratio of Cu to Zn atoms, lowering the energetic barriers to ethanol formation, and thus improving the selectivity of ethanol production.
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