NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 26
·12296-12303
·
IF 3.3
Wen-Hui Zhang,Zi-Yue Chen,Ren-Ming Liu,Xiong-Wei Liu,Bo-Wen Pan,Jian Zhou,Ying Zhou,You-Ping Tian,Xiong-Li Liu
Herein, previously unreported trimethylindolenines serving as useful C–N synthons in [3+2] cycloaddition reactions of donor–acceptor 3-isothiocyanato oxindoles to build a library of spiro[oxindole-thioxoimidazolidine-indoline] hybrids are described. A wide range of intriguing and complex products bearing three pharmacophores and three adjacent quaternary stereocentres were smoothly afforded in up to 92% yield, >20 : 1 dr, under catalyst-free conditions. Moreover, this strategy further expands the skeletal diversity of polyheterocycles, which will aid the search for new bioactive molecules.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Huangqing Ye,Jiahui Chen,Songrui Wei,Yougen Hu,Yu Wang,Xian-Zhu Fu,Rong Sun
Copper/carbon (Cu/C) hybrids with two-dimensional (2D) dendritic-like structure were successfully synthesized by a one-pot biological hydrothermal method with biomass as the reducing agent, capping agent, and template. By hydrothermal carbonization, the graphitic carbon is in-situ coated on the surface of nano copper to obtain a new type of 2D Cu/C materials. This method was facile, green, tunable and scalable. The influential factors on the morphology and carbon content of as-prepared hybrids were investigated, and possible growth mechanism was proposed. The as-prepared Cu/C hybrid materials exhibited a smallest thickness of 2.5 nm, with a radius-to-thickness ratio as high as 10 3 . Benefiting from the typical 2D structure and graphitic carbon coating layer, Cu/C hybrids exhibited excellent oxidation resistance and electrical conductivity , thus having great potential as a conductive adhesive filler used in the field of flexible electronics.
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CATALYSIS LETTERS
·
2021
·Vol. 153
·期 6
·1666-1675
·
IF 3.186
Wang Yuan,Liu Shanshan,Zhang Yidong,Guo Qirui
Hydrogenation of biomass-derived furfuryl alcohol to widely used tetrahydrofurfuryl alcohol is an important industrial route, which however calls for a more efficient catalyst. In this work, a highly selective and stable Ni-C-Al 2 O 3 catalyst for furfuryl alcohol hydrogenation to tetrahydrofurfuryl alcohol is reported. The catalyst precursor is prepared by in-situ growth of Ni-based metal organic frameworks (Ni-BTC) on Al 2 O 3 and then the precursor undergoes thermal decomposition to obtain the catalyst directly. For comparison, Ni-C/Al 2 O 3 acquired from pyrolysis of physically mixed Ni-MOFs with Al 2 O 3 and Ni/Al 2 O 3 prepared by impregnation method are also tested as the hydrogenation catalysts. The prepared catalysts are characterized by a series of techniques, including XRD, FT-IR, TG, TEM, SEM, XPS and BET to reveal the relationship between the catalysts structure and their performance. The results show that small metal Ni particle size and appropriate interaction between Ni and the support, which benefit from the in-situ preparation method are key factors that ensure the high furfuryl alcohol conversion (99.8%) and high selectivity to tetrahydrofurfuryl alcohol (98.2%) at moderate reaction conditions (120 °C, 30 min, 4 MPa H 2 ). Graphical Abstract
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NANOTECHNOLOGY
·
2021
·Vol. 33
·期 10
·105601
·
IF 3.874
Li Lin,Xing Du,Junjie Wang,Hui Chen,Xuan He,Wei Fang,Yang Li,Zhen Chen,Lei Zhao
Two-dimensional (2D) cobalt zeolitic imidazolate frameworks (ZIF-67) have attracted significant research interests to synthesize cobalt and nitrogen co-doped carbon-based (Co–N–C) catalyst for oxygen reduction reaction (ORR). However, most of the current synthetic approaches of 2D ZIF-67 are energy-intensive, environmentally hazardous and low-yield. Herein, a feasible and efficient 'morphology-retaining method via a high-pressure vapor-solid reaction' are reported to synthesize 2D ZIF-67 nanosheets by using 2D cobalt carbonate hydroxide template. In the strategy, the high-pressure vapor caused by sublimation of 2-Melm and the pores formed from effusion of CO2 during transformation ensure the complete transformation from 2D template to 2D ZIF-67. The corresponding 2D Co–N–C catalyst exhibits comparable ORR electrocatalytic activity and better stability than Pt/C in alkaline media. The present method is expected to offer a feasible and universal way to efficiently synthesize 2D M–N–C catalysts.
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Energy Technology
·
2023
·Vol. 12
·期 3
·2300736
·
IF 3.8
Peilong Zhou,Xinwei Geng,Dongxu Yao,Yongfeng Xia,Yu-Ping Zeng
Traditional carbon materials suffer from weak adsorption of lithium polysulfides and excessive consumption of electrolyte. A simple and feasible molten salt method is applied for constructing an active nanocrystalline TiC shell on the surface of porous carbon. The highly active TiC nanoshells endow the core–shell composite with efficient chemical–physical synergistic adsorption, which can effectively confine and convert polysulfides, thereby improving the electrochemical performance of lithium–sulfur batteries. The lithium–sulfur batteries assembled with modified separator deliver a high initial discharge specific capacity of 1396 mAh g −1 at a discharge rate of 0.5 C and a high capacity retention of 747.1 mAh g −1 after 500 cycles, with a high coulombic efficiency of 98% during cycling. Besides, this molten salt method can be applied to modify the porous carbon materials of various composite sulfur cathodes such as graphene, carbon nanotubes, and 3D nonwoven carbon fabrics.
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Small Methods
·
2026
·
IF 8.7
Rimsha Abbas,Muhammad Umair,Zhao Fu,Jingjing Luo,Suzhu Yu,Jun Wei
Omnidirectional strain sensors capable of detecting large and complex deformations are highly promising for wearable motion monitoring; however, achieving both multidirectional strain perception and enhanced electrical sensitivity remains challenging. Herein, a peelable circular piezoresistive strain sensor based on KH570-modified hydroxylated multi-walled carbon nanotubes (m-MWCNT-OH)/Ecoflex is developed through a screen-printing strategy and further functionalized with a copper (II) 2,3,6,7,10,11-hexahydroxytriphenylene (Cu 3 (HHTP) 2 ) conductive metal-organic framework (c-MOF)/poly(3,4-ethylenedioxythiophene) nanofiber (PEDOT-NFs) nanolaminate. The circular sensing architecture facilitates uniform strain distribution and orientation-independent strain transfer, while the c-MOF/PEDOT-NFs coating constructs additional conductive pathways, enhancing strain-induced resistance variation. The sensor is fabricated using a sequential process involving screen printing of the m-MWCNT-OH/Ecoflex sensing layer, peel transfer, and spray deposition of the functional coating. The resulting sensor demonstrates a wide strain detection range of 0%–300%, a gauge factor (GF) of 8, a fast response time of 33 ms, a recovery time of 420 ms, and stable performance over 10 000 loading-unloading cycles. Compared with unmodified sensor, c-MOF/PEDOT-NFs functionalization significantly improves electrical sensitivity while maintaining the intrinsic omnidirectional sensing capability. Finite element analysis (FEA) confirms similar strain-transfer characteristics under different loading directions. The sensor enables accurate monitoring of multidirectional human motions, highlighting its potential for wearable electronics, soft robotics, and human-machine interfaces.
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Frontiers in Chemistry
·
2026
·
IF 5.3
Zhaoyu Meng
The conversion of CO 2 to CO using electrochemistry requires the use of earth abundant catalysts with high selectivity, rapid reaction rate, and durability. In this work, hierarchically porous Co–N–C catalysts were synthesized via co-pyrolysis of a bimetallic zeolitic imidazolate framework (Zn/Co) and the dicyandiamide (DCD) followed by acid etching. By systematically adjusting the pyrolysis temperature (800 °C–1,000 °C) and the Co feed ratio (5–20 mol%), volcano-type activity relationships are found, which are controlled by the interplay of the three factors graphitization, nitrogen retention, and the density of Co–N x sites. The optimized catalyst CoNC-900 achieves a Faradaic efficiency of CO of 94.9% ± 1.0% at −0.75 V vs. RHE in CO 2 -saturated 0.5 M KHCO 3 with a CO partial current density of 16.0 mA cm −2 , a lower bound turnover frequency of ≥0.33 s −1 and ≈11% current decay FE_CO retained above 92% over 24 h. The observed selectivity can be rationalized, as the density functional theory calculations indicate that the barrier of the rate-determining step, namely the formation of COOH is lowered on the Co–N 4 moiety (0.42 eV, whereas ≥1.79 eV on the metal-free nitrogen sites). A transferable design rule is developed for CO 2 electrolysis that relates bimetallic MOF precursor chemistry, hierarchical porosity, and M–N x site engineering.
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Batteries & Supercaps
·
2023
·
IF 5.7
Weiquan Liang,Mingjie Liu,Xiaoyan Shi,Bin Chen,Lianyi Shao,Junling Xu,Zhipeng Sun
Graphical A solvent-free method was used to realize the efficient component regulation of target multivariate MOFs/MXene-derived multi-metal selenides@C/MXene (NCMS@C/MX) composites. The electrochemical performance of these composites can be optimized due to the intrinsic characteristics of the containing metal selenides. Metal-organic frameworks (MOFs) are excellent precursors for electrode materials preparations. Synergistic effects may exist between different metal centers in multivariate MOFs, making them often more effective than single-metal MOFs. Herein, we propose an atom economic mechanochemical method to realize the efficient component regulation of target multivariate MOFs. Moreover, by combining the synthesis of multivariate MOFs and exfoliating MXene, multivariate MOF/MXene composites can be obtained via a one-step strategy. A further selenization process can derive them into selenides@C/MXene composites. These derived composites contain multiple nanostructured metal selenides embedded in multi-heteroatom doped carbon matrix. For these composites, abundant heterojunction structures are formed, which can build internal self-built electric field and enhance the reaction kinetics effectively for sodium-ion storage. More importantly, the electrochemical performance of NCMS@C/MX composites can be optimized due to the intrinsic characteristics of the containing metal selenides. Overall, experimental results demonstrate the universality of this solvent-free synthesis route for controllable preparation of high-performance selenides@C/MXene electrode materials. It provides a feasible and environmentally friendly method to adjust metal ratios for optimal energy storage performance. We hope this research inspires optimization strategies for high-performance electrode materials and leads to the development of energy storage materials with more rational structures and better performance.
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Separations
·
2023
·Vol. 10
·期 12
·580
·
IF 2.6
Jinmei Zhu,Xiaofei Wen,Yuanhui Feng,Shuaibing Ren,Zimo Lou,Jiansheng Li
Cathodic reduction is a green and promising remediation strategy for reducing the antibacterial activity of antibiotic contaminants and increasing their biodegradability. However, the lack of cost-effective electrocatalysts has restricted its application. In this study, we upcycled textile white mud by separating 1,4-dicarboxybenzene (BDC) and fabricating MIL-125(Ti)-derived amorphous TiO2@C (TiO2@C-W) as a functional electrocatalyst. The separated BDC from white mud shows lower crystallinity than BDC chemicals, but the resulting TiO2@C-W features a much higher degree of oxygen vacancies and a 25-fold higher specific surface area than that of TiO2@C derived from BDC chemicals. With florfenicol (FLO) as a probe, TiO2@C-W exhibits similar cathodic reductive activity (0.017 min−1) as commercial Pd(3 wt.%)/C (0.018 min−1) does, which was 1.4 and 3.7 times higher than that of oxygen vacancy-engineered TiO2and TiO2@C, respectively. The as-fabricated TiO2@C-W could not easily remove FLO via the oxygen reduction reaction-based pathway with the applied bias for cathodic reduction. Though the activity of TiO2@C-W undergoes a slight decline with continuous running, more than 80% of 20 mg L−1FLO can still be reduced in the eighth run. Water chemistry studies suggest that a lower initial solution pH boosts the cathodic reduction process, while common co-existing anions such as Cl−, NO3−, HCO3−, and SO32−show a limited negative impact. Finally, TiO2@C-W shows reductive activity against several representative antibiotics, including nitrofurazone, metronidazole, and levofloxacin, clarifying its potential scope of application for antibiotics (e.g., molecules with structures like furan rings, nitro groups, and halogens). This study couples the upcycling of textile white mud with the remediation of antibiotics by developing functional electrocatalysts, and offers new insights for converting wastes from the printing and dyeing industry into value-added products.Keywords:textile white mud;1,4-dicarboxybenzene;electrocatalyst;cathodic reduction;antibiotics
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DESALINATION
·
2023
·
IF 9.9
Jing Xu,Ranran Cui,Chen Zhou,Shengyang Yang
Global water scarcity has sparked the need for effective desalination solutions. Conventional methods often come with demanding requirements and high costs. In this study, we explored the potential of AgNPs , precious metal nanoparticles , to enhance photothermal conversion efficiency in solar desalination. Through a two-step process, we incorporated AgNPs into carbon composites derived from organosilicon, boosting evaporation and photothermal rates of the solar absorber. The resulting AgNPs/C composite was then embedded in melamine foam (MF), using PDMS for improved adhesion and hydrophobicity , resulting in the AgNPs/C/MF (SCF) solar absorber. Our characterization revealed a rich pore structure and high absorption rate in the solar spectrum . Remarkably, the SCF achieved an effective water distillation rate of 1.62 kg m −2 h −1 and an impressive photothermal conversion efficiency of 91.3 %. Moreover, the SCF holds promise for seawater desalination , as well as the removal of heavy metals and dyes for decontamination purposes.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xueyan Xue,Nan Xue,Dandan Ouyang,Liuqian Yang,Yanan Wang,Hui Zhu,Aikelaimu Aihemaiti,Jiao Yin
Iron single-atom catalysts (Fe SACs) hold great promise for peroxymonosulfate (PMS) activation and degradation of organic pollutants in wastewater. However, insights into crucial catalytic sites and activation mechanisms of biochar-based Fe SACs for PMS remain a challenge. Herein, cotton stalk-derived biochar-based Fe SACs (Fe SACs-BC) with an asymmetric Fe-N/O-C configuration were prepared, and their PMS activation and acid orange 7 (AO7) degradation mechanisms were investigated. The results showed that the removal efficiency of the Fe SACs-BC catalyst with Fe-N3O-C configuration for AO7 and other five investigated organic dyes reached 95–99% within 15 min. The EPR spectrums, quenching experiments, electrochemical analysis, masking experiments, XPS, and theoretical calculations indicated that degradations of organic dyes were dominated by singlet oxygen, which was generated by direct PMS conversion at the electron-deficient carbon and iron sites in the Fe-N3O-C configuration. The Fe SACs-BC/PMS exhibited high removal efficiency and strong tolerance in different water matrices with a wide pH range, various coexisting anions and interfering substances, showing great potential and applicability for efficient treatment of actual textile wastewaters.
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RENEWABLE ENERGY
·
2023
·
IF 8.7
Shengjun Liu,Dianjun Chi,Rong Chen,Yan Ma,Huixue Fang,Kui Zhang,Bo Liu
Inspired by natural photosynthesis, the design of novel Z-scheme photocatalytic systems holds great promise for improving photocatalytic hydrogen production performance. Here, we constructed a Z-scheme heterojunction to effectively improve the charge separation of TiO 2 /ZnIn 2 S 4 , with the N-doped C layer acting as an electron bridge. The T@NC-A/ZIS-72 heterojunctions demonstrated hydrogen production activity approximately 12.1 and 97.9 times higher than those of ZnIn 2 S 4 and TiO 2 @NC-A, respectively. The excellent electron migration ability of the carbon layer accelerated the photocatalytic hydrogen production performance. Our design introduces a component to provide a dedicated charge transport pathway, overcoming the inherent properties of the material and providing a new perspective for enhancing photocatalytic performance.
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