Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 15
·9173-9182
·
IF 10.733
Ke Wang,Peter T. Clough,Pengfei Zhao,Edward J. Anthony
Calcium looping, a promising high-temperature CO2 capture technique, offers a mid-term economic solution to mitigate anthropogenic CO2 emissions. The main challenge in calcium looping is the synthesis of highly efficient CaO-based sorbents that can be used over many reaction cycles. Here, a sacrificial N-doped carbon nanosheet template was developed which produces MgO-stabilized CaO sorbents with fast adsorption rates, high capacities and remarkable long-term performance over many cycles. The characterization results show that such a template was formed through in situ pyrolysis of an organic acid and nitrates in a simple heating process in nitrogen. The presence of a carbonaceous template prevented crystallite growth, featured highly macroporous nanosheet (∼60 nm thick) morphologies, and ensured homogeneous mixing of Ca and Mg, which are essential to minimize diffusion limitations, mitigate sintering, and provide structural stability. Thus, 10 mol% MgO acting as an inert stabilizer was sufficient to achieve a CO2 uptake of 0.65 g g−1 (corresponding to a capacity retention of 89.9%) after 10 cycles under realistic conditions, as confirmed by TGA analysis. This N-doped carbon template can be applied generally to produce a wide range of porous and nanostructured stabilized CaO sorbents with stable CO2 uptake.
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RUSSIAN JOURNAL OF ORGANIC CHEMISTRY
·
2022
·Vol. 58
·期 6
·837-843
·
IF 0.862
Gu Zhengyu,Xue Feng,Yu Jiale,Ju Shengui
Abstract N -Aryl anthranilic acid drugs have been synthesized by a simple, environmentally friendly, low-cost, and high-yielding modified Ullmann coupling reaction protocol using potassium 2-bromobenzoate, substituted anilines, and copper acetate in tetrabutylphosphonium chloride ([TBP]Cl) ionic liquid. The optimal conditions have been found and applied to the synthesis of N -aryl anthranilic acid drugs at 170°C. Mass spectrometry, X-ray crystallography, and proton nuclear magnetic resonance were used to describe the structure of the products. Copper(I) complex catalyst was used as a starting catalyst for the Ullmann reaction because of the good fluidity and homogeneity in [TBP]Cl ionic liquid. Meclofenamic, mefenamic, clofenamic, and flufenamic acids were synthesized efficiently using the proposed general procedure. The distinct advantages of the described protocol are operational simplicity, cleaner reaction, high selectivity, excellent yield, rapid conversion, easy preparation, and the use of a low-cost catalyst.
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MOLECULES
·
2017
·Vol. 22
·期 6
·970
·
IF 2.861
Ming-Xia Song,Song-Hui Li,Jiao-Yang Peng,Ting-Ting Guo,Wen-Hui Xu,Shao-Feng Xiong,Xian-Qing Deng
Due to the rapidly growing bacterial resistance to antibiotics and the scarcity of novel agents under development, bacterial infections are still a pressing global problem, making new types of antibacterial agents, which are effective both alone and in combination with traditional antibiotics, urgently needed. In this paper, seven series ofN-arylsulfonylindole analogs5–11bearing rhodanine moieties were synthesized, characterized, and evaluated for antibacterial activity. According to the in vitro antimicrobial results, half of the synthesized compounds showed potent inhibition against four Gram-positive bacteria, with MIC values in the range of 0.5–8 µg/mL. For multidrug-resistant strains, compounds6aand6cwere the most potent, with MIC values of 0.5 µg/mL, having comparable activity to gatifloxacin, moxiflocaxin and norfloxacin and being 128-fold more potent than oxacillin (MIC = 64 µg/mL) and 64-fold more active than penicillin (MIC = 32 µg/mL) againstStaphylococcus aureusATCC 43300.
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Nanoscale
·
2013
·Vol. 5
·期 20
·9764-9772
·
IF 6.233
Dongfang Hou,Xianluo Hu,Pei Hu,Wei Zhang,Mingfei Zhang,Yunhui Huang
A novel p–n junction photocatalyst of Bi4Ti3O12 nanofibers–BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reaction (SILAR) process. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (DRS), and photoluminescence (PL) spectroscopy. The as-formed Bi4Ti3O12 nanofibers are composed of inter-linked nanoparticles of 50–80 nm in size. The thickness of the as-grown BiOI nanosheets is about 10 nm and the size of the BiOI nanosheets increases with the SILAR cycles. In particular, many {001} facets of BiOI nanosheets are exposed, which is favorable to enhance the visible-light photocatalytic activity. The p–n junction photocatalyst exhibits enhanced visible-light-driven photocatalytic activity for decomposition of rhodamine B (RhB) and phenol. The enhanced photocatalytic activity can be attributed to the extended absorption in the visible light region resulting from the BiOI nanosheets and the effective separation of photogenerated carriers driven by the photo-induced potential difference generated at the Bi4Ti3O12–BiOI p–n junction interface.
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MATERIALS LETTERS
·
2020
·
IF 3.204
Peng Zhou,Mingyu Zhang,Qizhong Huang Zhang,Zean Su,Yafeng Wang,Xiaodong Wang,Yueli Hu,Yuhao Li,Zhenghao Guo
To realize high capacity and long cycling stability for lithium-ion batteries (LIBs), a new type bimetal selenides MnSe/ZnSe encapsulated in nitrogen-doped carbon nanofibers (MZS@N-CNFs) have been fabricated for lithium ion battery via electrospinning and selenization processes. Synergistic effect of the ultrafine bimetal selenides nanoparticles provides a high specific capacity while the 1D carbon nanofibers can shorten the ions pathways and improve the conductivity. When assembled as anodes for LIBs, the MZS@N-CNFs demonstrate an extremely high capacity of 1369.1 mA h g −1 and excellent cycle stability of 826.1 mA h g −1 at 1 A g −1 after 300 cycles.
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Energy Technology
·
2019
·Vol. 7
·期 4
·1800963
·
IF 3.163
Maiyong Zhu,Qi Chen,Jiarui Kan,Jingjing Tang,Wenjing Wei,Jinkun Lin,Songjun Li
Herein, a sequential pyrolysis and oxidation strategy is developed to prepare Co 3 O 4 nanoparticles embedded in N-doped porous carbon (Co 3 O 4 @N-pC) using a bimetal zeolitic imidazolate framework (ZIF-67@ZIF-8) as precursors, which is first obtained via a simple wet-chemical process. The electrochemical performances of Co 3 O 4 @N-pC, ZIF-67@ZIF-8 precursors, and Co@N-Pc intermediates (the direct pyrolysis products from ZIF-67@ZIF-8) are studied as supercapacitor electrodes in comparison. The results reveal that the specific capacitance of the optimized Co 3 O 4 @N-pC electrode can reach up to 422.8 F g −1 at 1 A g −1 with a good rate capability (256 F g −1 at 5 A g −1 ) and excellent long-term cycling stability (87.9% retention after 5000 cycles). Such performance is superior over ZIF-67@ZIF-8 precursors (232 F g −1 at 1 A g −1 , 168.9 F g −1 at 5 A g −1 , and 82.7% retained after 5000 cycles) and Co@N-pC intermediates (218.4 F g −1 at 1 A g −1 , 171 F g −1 at 5 A g −1 , and 76.3% retained after 5000 cycles). The findings in this work are expected to provide a new avenue to explore other metal oxide/carbon materials for various applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiaoqing Huang,Wenbiao Zhang,Chaojin Zhou,Lichun Yang,Hui Wang,Qingsheng Gao,Min Zhu
Volume expansion and poor conductivity result in poor cyclability and low rate capability, which are the major challenges of transition-metal oxide as anode materials for sodium-ion batteries (SIBs). Herein, N -doped carbon encapsulated CoMoO 4 (CoMoO 4 @NC) nanorods are developed as excellent anode materials for SIBs with long-cycle life. The N -doped carbon shells serve as buffer to accommodate severe volume changes during sodiation/desodiation, and at the same time improve electronic conductivity and activate surface sites of CoMoO 4 . The optimized composite presents rapid reaction kinetics and excellent cycle stability. Even at a high current density of 1 A g −1 , it still shows long-cycle life and maintains specific capacity of 190 mAh g −1 after 3200 cycles. Furthermore, CoMoO 4 @NC anode is applied to match with Na 3 V 2 (PO 4 ) 3 cathode to assemble full-cells, in which it accomplishes reversible capacity of 152 mAh g −1 after 100 cycles, with capacity retention of 75% at a current density of 1 A g −1 , highlighting the practical application for SIBs.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Ao Zhou,Hao Yu,Jun Tang,Biao Zhang,Fugang Qi,Yun Zhou,Nie Zhao,Xiaoping Ouyang
With the rapid development of the modern industrial marine economy, metal corrosion and biological fouling of marine ships and engineering equipment have become the main problems affecting the development of the marine industry. Traditional single-function coatings have only anti-corrosion or anti-fouling properties, which cannot meet the current needs of marine industry development for coating protection. In this study, a self-healing coating with good anticorrosion and antifouling properties has been prepared upon functionalization of a film forming resin and modification of a nanofiller. Initially, a modified acrylic resin (PAZ/N-PMI) was successfully synthesized by inserting zinc ions and a structural functional monomer ( N -phenyl maleimide; N-PMI) into the polymer chain of an acrylic resin using free radical solution polymerization . A fluorinated silica coated hydroxylated multi-walled carbon nanotubes nanocomposite (F-MWCNTs-OH@SiO 2 ) was dispersed in PAZ/N-PMI resin to prepare the composite coating samples. The composite coating showed good performance, in which the antibacterial rate of the composite coating against Staphylococcus aureus and Escherichia coli was >99.98 %. When F-MWCNTs-OH@SiO 2 was 3 wt%, the Z f=0.01Hz of the composite coating reached the highest value, which was 3 orders of magnitude higher than that of the PAZ/N-PMI coating. At the same time, the prepared composite coating also exhibited good self-healing properties. This study provides a broad application prospect for the development of high quality marine anti-corrosion and anti-fouling organic coatings .
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xiaoyu Jia,Chenxu Zhang,Yongcai Zhang,Enren Zhang
In this study, Fe/N/Cs oxygen reduction reaction (ORR) catalysts with high specific surface area, catalytic activity were synthesized using legume biomass with different protein content. The catalytic activity of the Fe/N/C catalysts was confirmed to be related to the protein content of the biomass precursor by characterization and electrochemical tests. The catalysts (named as Fe/N/C-T) from lactone tofu have the highest N/C ratio related to ORR, and the air-cathode loaded with Fe/N/C-T catalysts exhibited the best ORR performance in linear sweep voltammetry (LSV) tests, which was comparable to that of commercial Pt/C catalysts. MFCs with AC(Fe/N/C-T) air-cathode produced a maximum power density of 0.486 mW cm −2 , higher than Pt/C (0.437 mW cm −2 ) with the same loading. In addition, the Fe/N/C-T catalyst demonstrated high stability and resistance to toxicity in long-term operation, which can be an alternative to commercial Pt/C.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 12
·7610-7617
·
IF 1.134
Chen Zhongzhen,Huang Haiping,Chen Yanan,Ye Ying,Wu Shuzhen,Wang Wenjing,Hu Yongmei
A novel nanocomposite of N-Doped Carbon Quantum Dots@Carbon Nanotubes was synthesized in this study for electrochemical detection of bisphenol A by differential pulse voltammetry. The nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy,
X-ray powder diffraction and Fourier transform infrared spectroscopy. Electrochemical properties of the nanocomposite modified glassy carbon electrodes were studied via cyclic voltammetry. Differential pulse voltammetry experimental results showed that N-Doped Carbon Quantum Dots@Carbon Nanotubes/glassy
carbon electrode exhibited excellent catalysis activity towards electrochemical oxidation of bisphenol A. The oxidation peak current was linearly increased with concentration of bisphenol A in the range from 0.4 μM to 40 μM, with a limit of detection of 65 nM.
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ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 1
·150-156
·
IF 0.886
YANG Bing-Jian,WANG Hong,Li Lei,HUANG Bo-Wen,LIAO Xiao-Zhen,HE Yu-Shi,MA Zi-Feng
The development of low-cost and effective electrocatalysts for air electrodes is critical for practical applications of lithium/oxygen batteries. In the present work, phenanthroline (phen) was used as a ligand to prepare a Co(phen)2 complex. The Co(phen)2 complex
was coated on BP2000 and then heat treated at 600, 700, 800, and 900 , to obtain carbon-supported Co-N (Co-N/C) catalysts. The catalytic activities in oxygen reduction reaction/oxygen evolution reaction (ORR/OER) of the prepared catalysts were measured and compared with those of a typical
carbon-supported cobalt tetramethoxyphenylporphyrin (CoTMPP/C) catalyst. The influence of the calcination temperature on the composition and structure of the Co-N/C catalysts was investigated. Electrochemical tests showed that the Co-N/C catalysts prepared at 700 and 800 gave better performances,
comparable to that of the CoTMPP/C catalyst. The superior electrochemical performance of the prepared Co-N/C catalysts and the low cost of the phenanthroline chelating agent make Co-N/C a promising cheap catalyst for lithium/oxygen batteries.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 15
·7145-7157
·
IF 11.301
Jinling Xue,Yinshi Li,Jue Hu
It remains a major challenge to develop a facile method to prepare non-noble metal electrocatalysts with high activity and durability to drive the sluggish oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs). Herein, a highly efficient bimetallic Zn/Fe@N-doped hierarchical porous carbon (Zn/Fe–N–C) catalyst derived from ZIF-8 and hemin (host–guest) was firstly reported by one-step thermal treatment. Fe2+ spatially separated by using the hemin guest in the ZIF-8 framework and hydrocarbon-branched chains form rich Fe–Nx active sites, and the evaporation of Zn2+ generates a highly porous structure in the Zn/Fe–N–C catalysts. Benefitting from this unique structure and composition, the resulting Zn/Fe2–N–C catalyst exhibits excellent ORR activities in both 0.1 M KOH (onset potential, Eonset = 1.08 V, and half-wave potential, E1/2 = 0.86 V vs. RHE) and 0.5 M H2SO4 media (Eonset = 1.04 V and E1/2 = 0.81 V), which are even comparable to those of the commercial Pt/C catalyst, and ranks among the top reported electrocatalysts. In addition, it also has outstanding long-term durability and good methanol resistance, much better than those of Pt/C in both acidic and alkaline media, which makes it one of the best non-noble alternatives of Pt-based catalysts for ORR electrocatalysis. This work highlights the potential to rationally design and fabricate high-performance ORR catalysts for fuel cell applications.
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危险品化学品经营许可证（带存储）