JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Kun Lei,Jinyang Feng,Yuna Sun,Donghua Wu,Xiujian Zhao,Xiao Ma
Doped Cu + glass was prepared by ion exchange method. It was found that the accumulation zone of copper ions would be formed on the glass surface during the process of ion exchange, and there was an extreme point of copper ion distribution concentration about 10 µm inside the glass surface after ion exchange. The exchange depth of copper ions in the sample increased with the increase of ion exchange time. At low ion exchange temperatures, the Cu elements exchanged into the vitreous body exists in the form of Cu + and Cu 2+ . With the exchange of Cu + into the glass, the degree of polymerization of the glasses continued to increase. By raising the ion exchange temperature, a large number of spherical Cu 2 O grains formed on the surface of the sample, continuing to raise the temperature, these spherical grains agglomerated and adhered to form lamellae structure, mainly composed of oxides of Cu 2 O and CuO. The PL spectra showed that the ion-exchanged glass exhibited broadband blue-green emission light with a central wavelength of 468 nm and half-height width of 154 nm under 290 nm excitation. The luminescence intensity appeared to increase firstly and then decrease with increasing the ion exchange time. Dispersed spherical Cu 2 O grains were generated on the surface of the sample exchanged at 410 °C for 16 h. Co-composite luminescence of the spherical Cu 2 O semiconductor and the Cu + doped in the glass effectively increased the luminescence intensity of the samples. In addition, the samples showed a favorable thermal stability of luminescence.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 35
·20504-20514
·
IF 3.119
Jianwen Wei,Siqi Chen,Yu Li,Zeyu He,Linlin Geng,Lei Liao
To find an alternative adsorbent with high adsorption performance, KIT-6 was prepared by hydrothermal crystallization synthesis using tetraethyl orthosilicate as a silicon source and triblock copolymer P123 as a template. Then the silane coupling agent (3-chloropropyl)trimethoxysilane was first grafted onto KIT-6 mesoporous material and then the polyethyleneimine (PEI) was further grafted through the substitution reaction between amino groups and chlorine atoms. The functionalized KIT-6 was denoted as PEI/KIT-6. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption, elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The Cu2+ adsorption performance was determined by inductively coupled plasma (ICP). The results showed that the average loading of the amino groups was 3.74 mmol g−1, and the modified KIT-6 still has a stable mesoporous structure without pore blockage. With the dosage of 1 g L−1 PEI/KIT-6 and at room temperature, the optimum pH value for adsorption of 100 mg L−1 Cu2+ was 6.0. The adsorption capacity of PEI/KIT-6 for Cu2+ increased with the increase of reaction temperature, and the maximum adsorption capacity of Cu2+ was 36.43 mg g−1. The adsorption capacity tends to reach equilibrium after 120 min, and the optimum adsorption temperature was 35 °C. The pseudo-second-order kinetic model was found to be well suited for the adsorption process of Cu2+. Adsorption equilibrium data could also be described well by the classical Langmuir and Freundlich isotherm models. The adsorption tends to be the chemisorption of a monolayer.
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PubMed
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 30
·4347-4358
·
IF 5.582
Junnan He,Nan Zheng,Ming Li,YuBin Zheng,Wangze Song
Multicomponent polymerization has emerged as a promising strategy to develop functional polymers with versatile structures. In this work, a Cu-catalyzed four-component polymerization was developed using diynes, sulfonyl azides, nucleophiles, and a variety of electrophiles including alkyl glyoxylates, nitroalkenes, and Morita–Baylis–Hillman adducts to successfully synthesize a library of α-functionalized poly(N-sulfonylimidates)s with a wide substrate scope and high molecular weights (up to 20 000 g mol−1) in high yields (up to 86%). Such α-functionalized poly(N-sulfonylimidates)s could be further post-modified or utilized for the design of multi-functional and biodegradable polymers.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 9
·2933
·
IF 4.927
Yiran Wang,Fengxue Duan,Xiaoting Liu,Bao Li
Counter-cations are essential components of polyoxometalates (POMs), which have a distinct influence on the solubility, stabilization, self-assembly, and functionality of POMs. To investigate the roles of cations in the packing of POMs, as a systematic investigation, herein, a series of triol-ligand covalently modified Cu-centered Anderson-Evans POMs with different counter ions were prepared in an aqueous solution and characterized by various techniques including single-crystal X-ray diffraction. Using the strategy of controlling Mo sources, in the presence of triol ligand, NH4+, Cu2+and Na+were introduced successfully into POMs. When (NH4)6Mo7O24was selected, the counter cations of the produced POMs were ammonium ions, which resulted in the existence of clusters in the discrete state. Additionally, with the modulation of the pH of the solutions, the modified sites of triol ligands on the cluster can be controlled to form δ- or χ-isomers. By applying MoO3in the same reaction, Cu2+ions served as linkers to connect triol-ligand modified polyanions into chains. When Na4Mo8O26was employed as the Mo source to react with triol ligands in the presence of CuCl2, two 2-D networks were obtained with {Na4(H2O)14} or {{Na2(H2O)4} sub-clusters as linkers, where the building blocks were δ/δ- and χ/χ-isomers, respectively. The present investigation reveals that the charges, sizes and coordination manners of the counter cations have an obvious influence on the assembled structure of polyanions.Keywords:polyoxometalate;Anderson-Evans;triol ligand;cation-modulation
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PubMed
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 38
·9054-9062
·
IF 3.858
Zongjian Liu,Yuanyuan Chen,Yifan Zheng
We propose a novel strategy for the synthesis of materials with a hierarchical structure. This strategy is based on in situ combination of two processes, namely, capping agent-mediated oriented growth and stirring-induced aggregation, and the growth of Cu crystals in the presence of linear alkyl diamines of short carbon chain length under vigorous stirring is shown to demonstrate its feasibility. Our experimental results have shown that the oriented growth of Cu nanowires can be significantly disturbed by vigorous stirring, resulting in large-scale growth of hierarchical dendritic Cu crystals. The morphology of grown dendritic Cu crystals has been found to vary with the stirring rate, type of diamine, and diamine concentration, which makes it possible to prepare hierarchical Cu structures of various morphologies. The growth mechanism of these hierarchical Cu structures is proposed based on the experimental observations. The present unique strategy offers a fresh way to fabricate materials with a hierarchical structure.
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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.
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高影响因子
Chem Catalysis
·
2022
·
IF 0
Wenjie Wu,Yulu Yang,Yitong Wang,Tiantian Lu,Qingsong Dong,Junwei Zhao,Jingyang Niu,Qingchao Liu,Zhaomin Hao,Shuyan Song
Electrosynthesis of urea from N 2 and CO 2 molecules is of immense significance but has so far been plagued by the lack of a universal design principle to guide the search for new catalysts. Herein, as exemplified by the Cu-Bi catalyst, our findings revealed that the defective Cu-Bi catalyst could offer a maximum urea concentration of 0.45 ± 0.06 mg L −1 and the largest faradaic efficiency of 8.7% ± 1.7% at −0.4 V (versus reversible hydrogen electrode [RHE]), exhibiting outstanding activity in contrast to monometallic (Cu and Bi) and bimetallic (Cu-Bi mixture and intact Cu-Bi) catalysts. Moreover, the evidence from isotope tracing experiments, in situ Raman spectroscopy, and density functional theory (DFT) calculations suggested that it is a promising strategy for the co-reduction of N 2 and CO 2 by defective Cu-Bi catalysts, switching on a light to the application of defects in electrosynthesis of urea.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 42
·23817-23827
·
IF 12.732
Manman Feng,Xuemei Wu,Huiyuan Cheng,Zihao Fan,Xiangcun Li,Fujun Cui,Shuai Fan,Yan Dai,Guangping Lei,Gaohong He
The diatomic catalysts (DACs) provide a new strategy for efficient catalysis of CO2 reduction reaction (CO2RR) owing to their maximum atomic utility and more flexible active sites. However, it is still challenging to precisely design heteronuclear diatomic active centers and understand the coordination mechanism of binary sites at the atomic level. Herein, a nitrogen-doped carbon matrix with precisely controlled Fe–Cu diatom sites is synthesized through a metal–organic framework. The as-obtained Fe/Cu–N–C catalyst exhibits an excellent CO faradaic efficiency (>95% over a wide potential range of −0.4 to −1.1 V vs. RHE, 99.2% at −0.8 V vs. RHE), a high turnover frequency (5047 h−1 at −1.1 V vs. RHE), and a low overpotential (50 mV), thus outperforming most reported atomically dispersed catalysts. Further density functional theory calculations indicate that the synergy between Fe–Cu diatoms causes rapid charge transfer and effectively adjusts the position of the d-band center, which reduces the energy barriers for *COOH formation and *CO desorption. This work provides a new approach for advancing universal synthesis strategies to construct heteronuclear diatomic catalysts and explore synergistic effects.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 12
·1562
·
IF 4.501
Di Liu,Hui-Zi Huang,Zhejiaji Zhu,Jiani Li,Li-Wei Chen,Xiao-Ting Jing,An-Xiang Yin
The development and commercialization of direct ethanol fuel cells requires active and durable electro-catalysts towards the ethanol oxidation reactions (EOR). Rational composition and morphology control of Pt-based alloy nanocrystals can not only enhance their EOR reactivity but also reduce the consumption of precious Pt. Herein, PtCu nanocubes (NCs)/CB enclosed by well-defined (100) facets were prepared by solution synthesis, exhibiting much higher mass activity (4.96 A mgPt−1) than PtCu nanoparticles (NPs)/CB with irregular shapes (3.26 A mgPt−1) and commercial Pt/C (1.67 A mgPt−1). CO stripping and in situ Fourier transform infrared spectroscopy (FTIR) experiments indicate that the alloying of Cu enhanced the adsorption of ethanol, accelerated the subsequent oxidation of intermediate species, and increased the resistance to CO poisoning of PtCu NCs/CB, as compared with commercial Pt/C. Therefore, alloying Pt with earth-abundant Cu under rational composition and surface control can optimize its surface and electronic structures and represents a promising strategy to promote the performance of electro-catalysts while reduce the use of precious metals.Keywords:Pt–Cu alloy;nanocubes;electrocatalysis;ethanol oxidation reaction;in situ FTIR
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高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 21
·7378-7385
·
IF 5.721
Mengna Ding,Fengyan Shi,Huijuan Zhu,Yuping Yang,Jiahui Zhong,Liulin Luo,Yuning Huo,Hexing Li
A hybrid Cu2O/TiO2 composite loaded on a Cu mesh (Cu2O/TiO2@Cu mesh) was developed via a supercritical solvothermal route. A uniformly distributed Cu2O/TiO2 p–n hetero-junction was stably coated on a Cu mesh, benefiting the visible-light harvesting. In comparison to electrochemistry and visible-light photocatalysis, the photoelectrochemistry process on the photoanode of the Cu2O/TiO2@Cu mesh presented improved bacterial inactivation activity for Acinetobacter baumannii. By means of the main active species of ˙O2− radicals, the photoelectrocatalytic process on the Cu2O/TiO2@Cu mesh also realized complete leakage of K+ ions, much stronger mineralization of the cell membrane and more efficient elimination of the self-recovery function, finally leading to cell death. In comparison, the electrochemistry process only led to the leakage of K+ ions without inactivation of bacteria, and the visible-light photocatalysis process induced partial leakage of K+ ions and cell mineralization after the death of most bacteria.
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高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Danqing Shu,Miao Wang,Fengyu Tian,Honglei Zhang,Chuang Peng
Electroreduction of CO 2 to high value-added products such as hydrocarbons provides a promising way to create a carbon neutral circular economy. Copper (Cu) is the most effective metal catalyst with selectivity towards hydrocarbons but Cu catalyst alone generally produces hydrocarbons at low selectivity and yield. Operando surface enhanced infrared absorption spectroscopic (SEIRAS) analysis reveals that the low hydrocarbon yield is attributed to the poor ability of Cu to produce carbon monoxide (CO), which is a crucial intermediate for hydrocarbon formation. In the current study, an Ag-Cu dual-cathode CO 2 RR device is developed, which allows separate control of electrode potential. This dual-cathode cell shows increased hydrocarbon yield (83 % for methane and 106 % for ethylene) and a 200 mV lower onset potential for C 2 H 4 , compared to electrolysis with a single Cu cathode. The CO produced by the Ag cathode transfers to Cu and increase its CO coverage, facilitating methane formation as well as promoting C C coupling to form ethylene. This study also reveals a mismatch of optimum electrode potential between Ag and Cu, which results in compromised performance of the two components in an Ag-Cu bimetallic electrocatalyst, but poses no challenge in the dual-cathode cell. To optimize the performance of the dual-cathode cell, we propose the use of a single-pass dual-gas-diffusion-cathode reactor with enhanced mass transfer for maximum hydrocarbon production. This work verifies that splitting the complex CO 2 RR process into two separate steps is a feasible method to improve the overall efficiency and rate of advanced products while reducing the energy input.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 35
·3601-3610
·
IF 2.524
Shaozhong Li,Qing Guo,Jin Li,Yongke Hu,Jiayu Lin
Graphical The mesostructured Cu/AlZnO-9 catalyst with 15 wt % Cu was prepared for the hydrogenation of CO 2 to methanol. The well mesostructure increased the exposed Cu surface area and CO 2 adsorption sites, which accelerated the CO 2 conversion, and the ZnO in catalyst increased the generation of methanol. In addition, the well mesostructure heightened the stability of supported Cu catalyst due to the high dispersion of Cu nanoparticles. In this work, the mesostructured Cu/AlZnO catalysts were prepared for the CO 2 hydrogenation to methanol. Experimental results showed that the weight ratio of Al 2 O 3 and ZnO affected the morphology of the mesoporous AlZnO supports and surface properties of the mesostructured Cu/AlZnO catalysts. The AlZnO-9 (the Al 2 O 3 mass within the AlZnO support was 90 wt%) with loose spongy porous structure and high surface area facilitated the Cu nanoparticle dispersion. Thus, the Cu/AlZnO-9 catalyst showed higher exposed Cu surface area ( S Cu ) and more exposed CO 2 adsorption sites, which accelerated the CO 2 conversion. Meanwhile, the ZnO added into catalysts increased the strength of surface basicity and the surface concentration of Zn species, which promoted the catalytic activity of CO 2 hydrogenation to methanol. In addition, the well mesostructure heightened the stability of supported Cu catalyst due to the high dispersion of Cu nanoparticles.
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高影响因子
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