JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Xu Liu,Yanping Liu,Minghao Jin,Chenxi Xu,Yushan Tian,Miao Zhou,Wei Wang,Gangyong Li,Zhaohui Hou,Liang Chen
Owing to high theoretical capacity, low cost and abundant availability, manganese oxides are widely viewed as promising anodes for lithium–ion batteries (LIBs). Nonetheless, their practical application is significantly hindered by poor electrical conductivity, sluggish reaction kinetics and substantial volume change. In this work, an ingenious polypyrrole encapsulation followed by pyrolysis strategy is proposed to produce N–doped carbon encapsulated Mn 2 O 3 /MnO heterojunction (Mn 2 O 3 /MnO@NC) by using mechanically ground Mn 3 O 4 /C 3 N 4 mixture as the precursor. The results show that the selection of precursor plays a pivotal role in the successful preparation of Mn 2 O 3 /MnO@NC hybrid. It is revealed that the uniform encapsulation by N–doped carbon significantly enhances the conductivity and structural stability of the final product. Concurrently, the Mn 2 O 3 /MnO heterojunction within the resultant hybrid exhibits a unique quantum–dot size, which effectively shortens ion transport pathways and exposes the active sites for lithium storage. Additionally, experimental observations and theoretical calculations demonstrate that the built–in electric fields generated at the interfaces of Mn 2 O 3 /MnO heterojunction accelerate the charge transfer and ion diffusion, thereby enhancing the electrochemical reaction kinetics. As a result, the Mn 2 O 3 /MnO@NC hybrid displays much enhanced lithium storage performance. Evidently, our work offers a good guidance for the design and synthesis of advanced transition metal oxide/carbon anodes for LIBs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Jingying Xu,Xuan He,Jiale Zhu,Xianqing Shao,Xuedong Zhu
The investigation of the synthesis of pure-phase ZSM-22 zeolites and their catalytic performance in the n-hexane cracking reaction is of critical significance for industrial production. To enhance the crystallinity of ZSM-22, ethylene glycol was integrated into the synthesis gel, effectively suppressing the formation of quartz and ZSM-5 impurities. Due to the structure-directing effect of ethylene glycol, the ZSM-22 prepared demonstrates much more mesopores compared to the counterparts without ethylene glycol addition. Furthermore, the acid strength and density of the zeolite increased significantly. These pure-phase ZSM-22 samples exhibited enhanced performance in terms of both conversion efficiency and ethylene selectivity during n-hexane cracking, which is associated with the increased abundance of acid sites and a higher ratio of strong to weak acids. These findings highlight the beneficial effects of ethylene glycol modification on the regulation of crystal growth and the enhancement of catalytic performance in ZSM-22 catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Shaolong Wu,Liujing Li,Linling Qin,Zhongyuan Zhou
Si-based heterojunctions have been intensively employed to reduce the large overpotential of Si single-absorber photoelectrodes in the field of photoelectrochemical (PEC) water splitting, but achievement of high-quality heterojunctions with an appropriate bandgap on the Si nanostructure host remains a great challenge. Herein, the p-Si/n-CdS core/shell nanowire heterojunction photocathode has been achieved by a combination of nanosphere lithography, metal-assisted chemical etching, atomic layer deposition , and chemical bath deposition. Compared to the bare Si nanowire photocathode , the overpotential maintaining a photocurrent density of 10 mA cm −2 for the optimized p-Si/n-CdS core/shell nanowire heterojunction photocathode under AM 1.5G illumination is reduced by 0.93 V, and simultaneously the saturated photocurrent density is increased by 4.4 mA cm −2 . Analyses indicate that the introduced CdS shell can greatly facilitate the separation and transfer of the photogenerated carriers , as well as partly enhancing the optical absorption .
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2011
·Vol. 13
·期 11
·5061-5067
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IF 3.454
Shengtong Sun,Jun Hu,Hui Tang,Peiyi Wu
The thermally induced volume phase transition process of poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-AA) hydrogel is studied using FT-IR spectroscopy in combination with the perturbation correlation moving window (PCMW) technique and two-dimensional correlation spectroscopy (2Dcos) analysis. According to PCMW spectra analysis, an elevation of volume phase transition temperature (VPTT) due to an extra equilibrium of repulsive electrostatic interactions of acrylic acid moieties in hydrogel from 34 °C to ca. physiological temperature (37 °C) is determined. 2Dcos helps us to conclude that the dehydration of hydrogel responds earlier in the process of network collapse than hydrogen bond variations of AA and NIPAM moieties during heating, while the hydrogen bonds of NIPAM and AA moieties change before the network swelling in the cooling process. Furthermore, relatively stable inner hydrogen bonds of AA moieties restrict the complete expansion of PNIPAM-co-AA hydrogel, resulting in a unique irreversible recovery during cooling.
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POLYMER INTERNATIONAL
·
2011
·Vol. 60
·期 4
·703-710
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IF 2.056
Zhihong Zhang,Yan Liang,Ping Liang,Chao Li,Shaoming Fang
In order to fabricate a new polymer matrix for application in biochips and to understand the mechanism of adsorption of proteins on conducting polymers, we prepared polypyrrole (PPy) functionalized with ω-( N -pyrrolyl)-octylthiol moieties. The chemical structure of the polymer could be controlled by varying the concentration of pyrrole added as the monomer. Initially, ω-( N -pyrrolyl)-octylthiol was self-assembled into a monolayer on a gold surface. Thereafter, a layer of uniform and smooth PPy was obtained by the chemical copolymerization of pyrrole and the ω-( N -pyrrolyl)-octylthiol. Bovine serum albumin (BSA) adsorption on the polymer was investigated using surface plasmon resonance spectroscopy and cyclic voltammograms. The chemical structure and monomer components of the as-prepared films were characterized using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Water contact angle measurements were used to assess the surface wettability of the films throughout the preparative procedure. The kinetics of BSA adsorption onto the polymer could be controlled by varying the copolymer thickness and the pH value of the buffer solutions used. Moreover, the electroactivity was changed upon BSA binding. The results suggest that the new conducting polymer may potentially be applied as a more sensitive and reliable matrix in protein sensors. Copyright © 2011 Society of Chemical Industry
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CHEMOSPHERE
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2024
·
IF 8.1
Mu Li
The release of organic dyes, such as Rhodamine B (RhB), into industrial wastewater has led to significant issues with color pollution in aquatic environments. Herein, we prepared a cobalt nanoparticles (NPs)-based catalyst with the nitrogen-doped carbon-support (Co@N–C) for effective PMS activation. The Co@N–C/PMS system demonstrated the excellent catalytic activity of Co@N–C for activating PMS, achieving nearly 100% degradation of RhB. Singlet oxygen ( 1 O 2 ) and sulfate radicals (SO 4 • - ) were dominant reactive oxygen species for RhB degradation. Density functional theory (DFT) calculations substantiated that the production of 1 O 2 commenced with the initial generation of *OH through hydrogen abstraction from PMS, culminating in the direct release of oxygen to form 1 O 2 (PMS→*OH→O*→ 1 O 2 ). The generation of SO 4 • - was attributed to electron transfer to PMS from the surface of Co NPs (Co 0 →Co 2+ →Co 3+ ) and the C–N shell (Co 2+ →Co 3+ ). The research findings provided new insights into the development of Co-based heterogeneous catalysis for advanced oxidation of refractory organic pollutants in wastewater treatment.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Yingying Liu,Wanjing Cui,Xiuge Chen,Ming Wang,Haifeng Zhang,Zhi Wang
Reverse osmosis (RO) membrane technology is applied widely on the water desalinization for relieving the challenge of freshwater scarcity. Polyamide (PA) membranes with superior water flux and rejection in the RO process are currently in high demand. In this study, a novel reactive additive N-(3-Aminopropyl)-imidazole (N-IM) was utilized to optimize the interfacial polymerization (IP) process and enhance PA-RO membrane performance. N-IM made the nascent film more porous and created an RO membrane with a thicker PA separation layer. The modified membrane exhibited a more hydrophilic surface, ascribing to more carboxylic acid groups. This membrane exhibited an improved water flux, increasing from 59.67 L/(m 2 ∙h) of original membrane to 82.76 L/(m 2 ∙h) of the modified membrane with the addition of 0.5 % w/v N-IM concentration, which was attributed to the enhanced hydrophilicity and increased water trapping capacity provided by the imidazole ring in N-IM. Additionally, the NaCl rejection increased from 98.75 % to 98.97 %, which can be attributed to the thicker separation layer and more carboxylic acid groups. In addition, the membrane showed excellent stability of performance and good pH stability. The study presents a novel approach to producing RO membranes with exceptional performance.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 46
·19508-19518
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IF 2.7
Yuanyuan Wang,Yingjing Xia,Xingshen Dong,Wenyi Wang,Xueqin Wang,Yanxiu Liu,Peng Qiao,Geng Zhang,Shetian Liu
Supercapacitors, an innovative energy storage technology, combine the strengths of batteries and capacitors, enabling diverse applications in sectors such as communications, transportation, and aerospace. Porous carbon materials derived from biomass have excellent electrical conductivity, customizable dimensions, high surface area, and robust electrochemical stability, rendering them ideal candidates for supercapacitor electrodes. This research utilized edamame shells as the carbon precursor and KOH as the activating agent to synthesize a series of N/O co-doped porous carbons (ESC-x-800) through a combined pre-carbonization and activation process. This study thoroughly investigated the effect of KOH addition on the morphology, structure, and electrochemical performance of the materials. The result showed that the ESC-3-800 stood out as the top performer, distinguished by its unique self-doping characteristic with N and O atoms and a unique hierarchical porous structure. The ESC-3-800 boasted an impressive specific surface area of 3188.98 m2 g−1, coupled with a substantial pore volume of 1.86 cm3 g−1. When evaluated in a three-electrode system, ESC-3-800 demonstrated a remarkable specific capacitance of 301 F g−1, and a capacitance retention rate of 73.1% at a high current density of 20 A g−1. In a two-electrode setup, the ESC-3-800 achieved a notable high energy density of 37.6 W h kg−1 (at a power density of 200 W kg−1) in the 1 M Na2SO4 electrolyte. Remarkably, after enduring 12 000 charge–discharge cycles in 6 M KOH, it maintained an impressive 96.68% of its initial capacity (8 A g−1), demonstrating exceptional long-term stability and durability. The straightforward preparation method and outstanding performance of the edamame shell-derived N/O co-doped porous carbon underscore its immense potential for practical applications in supercapacitors.
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Regenerative Biomaterials
·
2018
·Vol. 5
·期 3
·141-149
·
IF 0
Shen Taipeng,Zhu Wencheng,Yang Li,Liu Li,Jin Rongrong,Duan Jimei,Anderson James M,Ai Hua
Dendritic cell (DC)-based vaccines have shown promising therapeutic results in cancer and some immune disorders. It is critical to track in vivo migration behaviours of DCs and monitor the whole process dynamically and non-invasively. Superparamagnetic iron oxide (SPIO) nanoparticles are chosen for DC labelling under magnetic resonance imaging (MRI) because of their proven biosafety as contrast agents. However, when used for cell labelling, sensitive biological indicators such as cell autophagy may be helpful to better understand the process and improve the probe design. Here, lactosylated N-Alkyl polyethylenimine coated SPIO nanoparticles are used for DC labelling. This probe shows satisfactory cell labelling efficiency and low cytotoxicity. In this study, autophagy was used as a key factor to understand how DCs react to nanoparticles after labelling. Our results demonstrate that the nanoparticles can induce protective autophagy in DCs, as inhibition of the autophagy flux could lead to cell death. Meanwhile, the nanoparticles induced autophagy could promote DC maturation which is an essential process for its migration and antigen presentation. Autophagy induced DC maturation is known to enhance the vaccine functions of DCs, therefore, our results suggest that beyond the MRI tracking ability, this probe might enhance therapeutic immune activation as well.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Yan Zhao,Bolei Wei,Mi Wu,Huiliang Zhang,Jinrong Yao,Xin Chen,Zhengzhong Shao
In this work, silica nanoparticles modified with a new N -halamine precursor (EBDMH-SiO 2 NPs) were synthesized through immobilization of 3-(4′-epoxyethyl-benzyl)-5,5-dimethylhydantoin (EBDMH) on the surface of amino-functionalized silica NPs. Then, EBDMH-SiO 2 NPs and poly(lactic acid) (PLA) were blended at 185 °C to prepare a novel environmentally friendly PLA based nanocomposite (PLA/EBDMH-SiO 2 ). The addition of EBDMH-SiO 2 NPs has great influences on the thermal properties of nanocomposite. DSC results show that the grass transition temperature ( T g ), cold crystallization temperature ( T cc ) and melting temperature ( T m ) of PLA in nanocomposites gradually decrease with the increase of EBDMH-SiO 2 NPs contents up to 5%. After that, further rise in EBDMH-SiO 2 NPs content actually increases T g , T cc , and T m . The overall crystallization and spherulite growth rate of PLA show the similar trend. Furthermore, the introduction of EBDMH-SiO 2 NPs increases the storage modulus and viscosity of the melt of nanocomposite, providing an additional benefit for PLA blowing and injection molding. After chlorination, the N -halamine precursors on the nanocomposite surfaces are transformed into N -halamines, which provide strong antibacterial activities against E. coli (CMCC 44103) and S. aureus (ATCC 6538), pointing to good potentials of the PLA/EBDMH-SiO 2 nanocomposites for antibacterial applications including food packaging, filters, and a wide range of hygienic products.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Li Ren,Wen Zhu,Qiuyu Zhang,Chong Lu,Fengzhan Sun,Xi Lin,Jianxin Zou
Magnesium hydride (MgH 2 ) is one of the most promising hydrogen storage materials, while the high desorption temperature and sluggish kinetics hamper its further commercialization. Herein, a novel MOF-derived 1D N-doped hierarchically porous carbon nanofiber (pCNF) is firstly prepared and used as the scaffold for self-assembly of MgH 2 /Ni nanoparticles (NPs). The resultant MgH 2 /Ni@pCNF nanocomposites show faster desorption kinetics ( E a = 96.58 kJ/mol H 2 ), lower onset desorption temperature ( T onset = 200 °C) when compare to the commercial MgH 2 ( E a = 142.27 kJ/mol H 2 , T onset = 350 °C). Moreover, hydrogen absorption can be achieved at a temperature as low as 100 °C with a capacity of 2.2 wt% within 120 min. Additionally, the composites exhibit excellent cycling stability with a capacity retention over 95.4% after 10 complete re-/dehydriding cycles at 300 °C. In-situ HRTEM observations of the desorption process combined with XPS and XRD indicate that the synergistic effects from nanoconfinement of Mg/MgH 2 in pCNF, electron-donating ability of N atoms and the “hydrogen pump” function of Mg 2 Ni/Mg 2 NiH 4 account for the unprecedent hydrogen storage properties. The strategy of using the MOF-derived 1D pCNF as support for nanoparticles provides a new approach for fabricating nanostructured energy materials with enhanced performances.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 12
·1-14
·
IF 2.8
Zeng Fanen,Tan Zhen,Yang Xun,Wang Xiamei,Xu Bing
The practical application of hierarchical porous carbon materials in supercapacitors is very important. Therefore, the development of a high–performance hierarchical porous carbon material is a huge challenge. The waste coffee grounds–based porous carbon (WBC) was synthesized from waste coffee grounds by carbonization and static air activation. The physicochemical properties of WBC were observed by scanning electron microscopy with energy dispersive X–ray spectroscopy, X–ray diffraction, Raman spectroscopy, X–ray photoelectron spectroscopy, and N 2 adsorption–desorption analysis. The WBC activated at 800 ℃ has a more developed hierarchical porous structure with a specific surface area of 639.01 m 2 g –1 , and an average pore diameter of 2.77 nm. The formation mechanism of the WBC, which has a hierarchical porous structure in static air activation, was illustrated systematically. Within the three–electrode system, the optimal WBC exhibits the highest specific capacitance of 164.4 F g –1 at 0.5 A g –1 in 6 M KOH and an excellent rate capability of 84.85% at 5 A g –1 . The constructed symmetric SC with the optimal WBC as electrode material and 6 M KOH as electrolyte achieved an energy density of 8.15 Wh kg –1 at a power density of 250 W kg –1 and an outstanding cyclic retention rate of 100% over 7000 cycles at 10 A g –1 . The hierarchical porous structure of WBC exhibits high specific capacitance, high energy density, and stable cyclic retention rate, which provides a broad application prospect for realizing energy storage and conversion applications.
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