JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Yilin Wang,Senqing Fan,Zeyi Xiao,Zenghui Mai,Ke Bai,Jiaojiao Chen,Yu Chen,Jingyun Liu
A catalytic membrane nano reactor (CMNR) with deep-permeation nanocomposite structure (DPNS) has been fabricated by flowing synthesis for methanol dehydrogenation to formaldehyde. In this structure, Cu/ZnO nanoparticles are in situ immobilized in the pores of Ti membrane substrate with thickness 1 mm, pore size 10 μm and porosity 45%. The characterization by XRD , TGA , XPS, SEM and TEM indicates that the Cu/ZnO nanoparticles with mean size of 82 nm was successfully embedded into the membrane pores, and well distributed along the thickness direction of the membrane. The ICP measurement results demonstrate that the immobilization amount of 20 mg of Cu/ZnO nanoparticles per gram of Ti membrane substrate can be obtained. The prepared Cu/ZnO/Ti CMNR was built in the technological apparatus for catalytic dehydrogenation of methanol. For one sheet of membrane setting up, the conversion efficiency of methanol 7.5%, the mass specific activity 183 mmol MeOH ·h -1 ·g cat -1 , the pressure drop 2.7 kPa with gas permeating the membrane have been measured, under mass ratio of Cu to ZnO 0.05 in the membrane, reaction temperature 360 °C, the gas flux 8 m 3 ·m -2 ·h -1 through the membrane. The selectivity of formaldehyde is up to 98% and increases with increasing reaction temperature, the highest mass specific activity of 318 mmol MeOH ·h -1 ·g cat -1 can be achieved with mass ratio of Cu to ZnO 0.12 at 360 °C. For three sheets of CMNRs setting up in serials, over 18% of conversion efficiency has been achieved with gas pressure drop 6.8 kPa. If 70 sheets of CMNRs are packed in serials to build a reactor with 70 mm thickness, which will produce the gas pressure drop 162 kPa, the conversion efficiency of 99% would be expected according to a simple simulation based on the experimental measurement.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Yangzhi Xu,Zirui Gao,Yao Xu,Xuetao Qin,Xin Tang,Zhiwei Xie,Jinrong Zhang,Chuqiao Song,Siyu Yao,Wu Zhou,Ding Ma,Lili Lin
Hydrogenation of CO 2 into methanol at low-temperature on Cu-based catalysts is of great significance, but remains challenging to enhance activity. In this paper, we report an inverse catalyst constructed with nano-ZrZnO x supported on Cu particles with outstanding methanol synthesis performance at 220 ℃, two times higher than that of commercial Cu/ZnO/Al 2 O 3 catalysts under the same conditions. Detailed structure characterization and performance evaluation demonstrate that the ZrZnO x mixed oxide serves as the most active oxide-metal interface site for CO 2 hydrogenation. The ZrZnO x /Cu inverse catalyst increases the weak and medium CO 2 adsorption sites which are further demonstrated responsible to the methanol productivity. In situ DRIFTs studies reveal that the inverse interface accelerates the reduction of asymmetric formate intermediates and prevents the generation of CO. The combination of enhanced CO 2 activation capability and accelerated hydrogenation rate of intermediates over the ZrZnO x /Cu inverse catalyst probably contribute to the remarkable methanol synthesis performance from CO 2 .
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CATALYSIS LETTERS
·
2018
·Vol. 149
·期 1
·77-83
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IF 2.911
Wang Hefang,Fu Qinglong,Zhang Guanyan,Sun Yangyang
Abstract A safe and reductant-free method based on co-reduction of nickel and copper oxides via vacuum thermal treatment has been developed for the synthesis of Ni–Cu alloy nanofibers, which includes electrospinning of a nickel acetate/copper acetate/polyvinylpolypyrrolidone (NiAc/CuAc/PVP) precursor solution, followed by vacuum thermal reduction. On account of the synergistic effect between Cu and Ni, the Ni–Cu alloy nanofibers catalyst with an optimal composition exhibits good catalytic performance for the decomposition of hydrous hydrazine in NaOH solution. Graphical Abstract Ni–Cu alloy nanofibers have been prepared by a vacuum thermal co-reduction method, and further used as catalysts for hydrous hydrazine decomposition.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Xin Xu,Jinhui Cai,Penghua Guo,Zhilin Zhou,Junya Cui,Yaqiang Ji,Jin-Qi Xie
A vertically aligned metal array based TIM was fabricated by electroless deposition on polyamide fibers. • The metal coated polyamide fibers exhibit excellent flexibility and resistance to oxidation. • The TIM demonstrate high thermal conductivity of 69.3 W/m·K, low Young's modulus of 32.5 MPa and excellent compliance. Constructing continuous high-thermal-conductivity channels that penetrate through the polymer matrix is one of the key approaches to achieving next-generation high-performance composite thermal interface materials (TIMs). Currently, the only reported metal copper microarray-based TIMs fabricated via porous sacrificial templating are costly and cumbersome. In this work, a novel and facile route is developed for constructing flexible, metallic array TIMs based on electroless plating of polyamide fiber arrays. The resulting Cu Ag bimetallic-coated (PA@Cu@Ag) fiber structures provide high-thermal-conductivity and performance-stable flexible channels for high-performance TIMs. The composite TIM, with the PA@Cu@Ag fiber array serving as the skeleton, exhibits a thermal conductivity as high as 69.3 W/m·K and a Young's modulus as low as 32.5 MPa. Its performance remains stable even after 1000 compression cycles and LED device on/off cycling. When assembled in LED devices, it significantly reduces the steady-state operating temperature to 58.0 °C, far outperforming conventional particle-filled composite materials. Download: Download high-res image (70KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yu Wang,Fengwen Yan,Jie Wu,Zhijun Huang,Liuting Song,Shunda Yuan
The utilization efficiency of single atoms is limited by the active sites being buried in support. To maximize atom utilization, Cu single atoms are anchored on the external surface of g-C 3 N 4 nanofibers (CNNFs), which are fabricated by partial thermal decomposition and subsequent self-assembly in H 2 O. The abundant N and O-containing functional groups of CNNFs are vital for the loading of Cu. Benefited from the full utilization of Cu sites, CNNF-Cu exhibits excellent Fenton-like catalytic activity for Methylene Blue degradation. The reaction kinetic constant is more than 10 times higher than that of the traditional single-atom catalyst with Cu sites evenly distributed throughout the entire support. CNNF-Cu maintains most of its catalytic activity after five cycle tests, suggesting good stability. This work provides a convenient method to maximize the utilization of single metal atoms for catalytic applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenli Su,Weizan Guo,Yu Fan
Constructing a bimetallic tandem catalytic system is an effective strategy to promote the CO 2 electroreduction (CO 2 ER) to ethanol. However, it is still difficult to achieve high selectivity for ethanol in the CO 2 ER because most of bimetallic catalysts lack sufficient biphasic boundaries. Herein, a series of novel CuAg bimetallic catalysts (CuAg x @NC) were prepared by anchoring Ag in the Cu-based metal–organic framework (NH 2 -Cu-BDC) followed with high-temperature pyrolysis. The results showed that the Ag in the optimal CuAg 5 @NC catalyst was highly dispersed and anchored on the Cu surface, so the catalyst had sufficient Cu-Ag biphasic boundaries, which resulted in superior C 2 products (especially ethanol) selectivities in the CO 2 ER: the Faradaic efficiency (FE) for ethanol production reached 51.8 % at − 1.0 V, and the FE for total C 2 products reached 82.6 % at − 1.2 V, which were higher than those of most previously reported CuAg electrocatalysts. Analyses of the reaction mechanism showed that the appropriate amount of Ag in the NH 2 -Cu-BDC derivative improved the CO coverage on the catalyst surface, promoted C-C coupling and enhanced the adsorption of key intermediates (such as CH 3 CHO) in the ethanol pathway.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Xin-Yan Zhang,Xu-Xia Yan,Shao-Yu Sun,Cheng-Zhen Wu,Hui-Dong Qiu,Qian-Yu Zhou
Laccase-like Cu-GMP complex forms directly without tedious synthesis. • The homogeneous system effectively avoids light-scattering interference. • The platform detects 2,4-DCP, BPA and epinephrine with low detection limits. • Smartphone-based colorimetry enables portable, low-cost on-site detection. • Good recoveries are achieved in lake water and human serum samples. The rapid and sensitive screening of phenolic compounds is essential for environmental safety and clinical diagnostics. Although laccase-like Cu-based nanozymes offer cost-effective alternatives to natural enzymes, most existing platforms rely on heterogeneous nanoparticles. These systems not only require tedious pre-treatment, but also suffer from light scattering that compromises colorimetric accuracy. Herein, a homogeneous colorimetric sensing platform based on the laccase-like activity of a copper-guanosine 5′-monophosphate (Cu-GMP) complex was developed. The complex is prepared directly in solution without the need for time-consuming synthesis. Furthermore, this homogeneous system eliminates light-scattering interference due to its intrinsic optical transparency. Benefiting from its catalytic versatility, the platform enabled the quantification of three phenolic targets. 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) were detected via 4-aminoantipyrine (4-AAP)-mediated coupling, while epinephrine was quantified by direct catalytic oxidation, with detection limits of 0.22, 0.59, and 0.21 μM, respectively. Additionally, integrating this system with smartphone technology enabled a portable platform for on-site quantification, demonstrating reliable accuracy in lake water and human serum samples. Overall, this work provides a versatile and low-cost homogeneous strategy for the point-of-need screening of phenolic pollutants and biomarkers. Download: Download high-res image (123KB) Download: Download full-size image
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Nano Research
·
2023
·
IF 9.9
Dou Tong,Song Dian,Wang Yiping,Zhao Xuhui,Zhang Fazhi,Lei Xiaodong
Electrocatalytic CO 2 reduction reaction (ECO 2 RR) converts CO 2 to high-value chemical products and promotes the carbon cycle. Sulfur (S)-modified copper (Cu) and bismuth (Bi)-based catalysts have been recognized as promising catalysts for ECO 2 RR. Both of them are highly active for selective formate generation, however, their poor stability and severe competing hydrogen evolution reaction (HER) remain challenging. Herein, S-doped Cu coated with Bi (Bi/Cu-S) is developed to improve ECO 2 RR selectivity to formate. Bi/Cu-S/brass mesh (BM) electrode material for ECO 2 RR was prepared by electrodepositing Bi on the surface of Cu-S/BM nanowires obtained from CuS/BM after the electroreduction. The Faradaic efficiency (FE) of the formate reaches the maximum of 94.3% at −0.9 V vs. reversible hydrogen electrode (RHE) with a partial current density as high as −50.7 mAcm −2 and a yield of 30.7 mmolh −1 cm −2 under 0.5 M KHCO 3 electrolyte. Meanwhile, the FE of formate is higher than 90% in the voltage range of −0.8 to −1.0 V vs. RHE. It also shows good stability at −0.9 V vs. RHE with the FE of formate remaining above 93% after a 10 h reaction. Density functional theory (DFT) calculations demonstrate that the Bi/Cu-S structure promotes the adsorption of CO 2 and effectively inhibits HER by enhancing the adsorption of *H to a great extent, improving the selective conversion of CO 2 to formate. This work deepens the understanding of the mechanism of Cu-Bi-based catalysts and S-modified Cu-based catalysts in selective ECO 2 RR to formate, and also provides a new strategy for catalyst design.
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GREEN CHEMISTRY
·
2023
·
IF 9.8
Tan Li,Jing Su,Linjia Yin,Xiangkun Zhang,Cong Wang,Xinbao Li,Jing Zhang,Kaige Wang
A Cu-based catalyst was developed for one-step solvent-free synthesis of aviation biofuel from biomass-derived ketones, including acetone, cyclopentanone, cyclohexanone, and 2-pentanone. Under the optimal working conditions, the conversion rate of acetone, cyclopentanone, cyclohexanone and 2-pentanone of 100% can be achieved by using Cu/Al2O3. 79.7 c% maximum carbon yield of liquid hydrocarbons with 89.5% selectivity of aviation biofuel was obtained under the conditions of 1.0 MPa H2, 280 °C, and 2 h−1 WHSV. The effects of the calcination temperature on the acidity and basicity of the catalyst, as well as the valence and dispersion of Cu species, were investigated. Based on DFT calculations and in situ DRIFTS results, the preferred adsorption of carbonyl groups and efficient dissociation of hydrogen on Cu+ increased the local concentration of H and feedstock on the catalyst surface, accelerating the rate-determining step that predominated on Cu0. The synergistic effect of Cu0 and Cu+ enhanced the formation of aviation biofuel.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaoxiao Wang,Awei Guo,Yunlong Wang,Zhipeng Chen,Yuxuan Guo,Haijiao Xie,Weilong Shan,Junjie Zhang
Electrochemical conversion of CO 2 into chemical feedstock , such as an energy-dense liquid product (formate), is desirable to address the excessive emission of greenhouse gases and store energy. Cu-based catalysts exhibit great advantages in electrochemical CO 2 reduction reaction (eCO 2 RR) due to their low cost and high abundance, but suffer from low selectivity of formate. In this work, a facile one-pot approach is developed to synthesize CuBr nanoparticle (CuBr NP) that can conduct in situ dynamic restructuring during eCO 2 RR to generate Br-doped Cu NP. The in situ-formed Br-doped Cu NP can afford up to 91.6% Faradaic efficiency (FE) for formate production with a partial current density of 15.1 mA·cm −2 at −0.94 V vs. reversible hydrogen electrode (RHE) in an H-type cell. Moreover, Br-doped Cu NP can deliver excellent long-term stability for up to 25 h. The first-principles density functional theory (DFT) calculations show that the doped Br can regulate the electronic structure of Cu active sites to optimize the adsorption of the HCOO* intermediate, greatly hindering the formation of CO and H 2 . This work provides a strategy for electronic modulation of metal active site and suggests new opportunities in high selectivity for electrocatalytic reduction of CO 2 to formate over Cu-based catalysts.
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PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Pingtao Ming,Yuanyuan Niu,Yongxin Liu,Jinhao Wang,Haohong Lai,Qing Zhou,Haiyun Zhai
In this study, the synthesis of Cu-MOF-199@multiwalled carbon nanotubes (Cu-MOF-199@MWCNTs) composites was achieved and utilized to create an advanced electrochemical sensor for creatinine (Cre) detection. The composites were modified on a glassy carbon electrode surface through direct drip coating, followed by the deposition of copper nanoparticles (CuNPs) via constant potential deposition. Characterized by various techniques and electrochemical analyses, the Cu-MOF-199@MWCNTs composite increased the CuNPs load, improving the detection sensitivity for Cre. Under optimal conditions, the modified electrode exhibited good linearity across a broad range of Cre concentrations (0.05–40.0 μM) with a low detection limit of 11.3 nM. The developed sensor demonstrated remarkable stability, reproducibility, and selectivity, showing promise in sensitive and accurate Cre detection in serum samples.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 31
·18994-18999
·
IF 3.361
Linzhi Li,Tianzeng Huang,Saijun He,Xing Liu,Qi Chen,Jian Chen,Hongmei Cao
A fast and sensitive test of blood glucose levels is very important for monitoring and reducing diabetic complications. Herein, a simple and sensitive non-enzymatic glucose sensing platform was fabricated by employing Cu2+–Cu+/biochar as the catalyst. The Cu2+–Cu+/biochar was synthesized through a bio-inspired synthesis, in which waste eggshell membrane (ESM) was introduced as a template to absorb Cu2+, then converting it into Cu2+–Cu+ biochar via a rapid pyrolysis. The structure and properties of the as-prepared Cu2+–Cu+ biochar were determined by scanning electron microscopy (SEM), FT-IR spectroscopy, Raman spectroscopy and cyclic voltammetry (CV). Due to great advantages of Cu2+–Cu+/biochar, such as high electrical conductivity, unique three-dimensional porous network and large electrochemically active surface area, the as-prepared Cu2+–Cu+ biochar modified electrode showed high catalytic activity towards glucose oxidization. The fabricated enzyme-free glucose sensor showed excellent performance for glucose determination with a linear range of 12.5–670 μM, and a limit of detection (LOD) of 1.04 μM. Moreover, the as-fabricated sensor has good anti-interference ability and stability. Finally, the proposed senor has been successfully applied to detect glucose in clinical samples (human serum). Owing to the green synthesis method, using biowaste ESM as a template, and the superior catalytic performance and low cost of Cu2+–Cu+/biochar, the developed sensor shows great potential in clinical applications for direct sensing of glucose.
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