Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 32
·16265-16270
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IF 11.301
Wenjuan Han,Ming Lu,Junnan Chen,Haojie Li,Haibo Li,Bingsen Zhang,Wei Zhang,Weitao Zheng
EMIm+, as a substitute for Li+, can solve the initial problems that accompany lithiation/delithiation processes on an anode. However, the larger size of EMIm+ limits the options when it comes to electrode materials. Herein, a multilayered Ti3C2Tx MXene was electrochemically pre-intercalated with Fe ions to achieve EMIm+ hosting abilities. As a result, a pre-intercalated MXene electrode exhibited enhanced EMIm+ transport and storage capabilities. When integrated with an EMIm+[PF6]− ionic liquid electrolyte, the assembled DIB provides an energy density of 76 W h kg−1 at a power density of 360 W kg−1, and 94.3% of the energy density is retained after 50 cycles. Compared with a pristine example, the Fe pre-intercalated Ti3C2Tx MXene showed a significant increase in electrochemical performance. Employing this approach to optimize layered materials may open up a new route for accurately tuning intercalated materials.
研究领域:
材料科学
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电化学
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储能技术
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 23
·8380
·
IF 3.748
Chen Chu,Jinqiong Tang,Zhiyang Zhao,Yong Kong,Xiaodong Shen
Aerogels have interconnected networks and preeminent pore structures. When used as the catalysts for oxygen reduction reaction (ORR), they can facilitate the mass transfer and expose more active sites. Here, we synthesized the Fe-doped titanium oxide-based aerogels (TA/Fes) by the sol–gel method combined with thermal treatment. The specific surface areas of the TA/Fes ranged from 475 to 774 m2·g−1, and the pore volumes varied from 0.96 to 1.72 cm3·g−1. The doping effect of the Fe ions and the oxygen vacancies in anatase enhance the electrical conductivity, leading to the low Rct (313.3–828.2 Ω). All samples showed excellent stability (2.0–4.5 mV) and 4e−pathway. The limiting current density of TA/Fe3 reached 5.34 mA·cm−2, which was comparable to that of commercial Pt/C. The preparation method is inspiring and the as-prepared aerogel catalysts have potential in promoting the scale of fuel cells.Keywords:TiO2aerogel;Fe ion doping;oxygen vacancy;pore structure;catalysis;ORR
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Zheng Fu,Jiantong He,Fengchun Jia,Mengjiao Wang,Fengling Cui
Since thiosemicarbazide contains numerous nitrogen and sulfur atoms in its structural formula that enhance its strong coordinating abilities with metal ions , it is always selected as the mother molecule for the design of metal-ion sensors. In this report, a thiosemicarbazide derivative (4-naphthalenyl-3-thiosemicarbazide (NTSC)) was synthesized via a single step process and covalently conjugated onto the surfaces of carbon dots (CDs). The modified CDs demonstrated excellent monodispersity, good photostability, and tunable luminescence properties. More importantly, the CDs retained a highly specific Fe 3+ recognition capacity in contrast to other competing metal ions . Fe 3+ can efficiently quench the fluorescence of CDs even at fairly low concentration (30 μM) with a detection limit as low as 1.68 nM. The fluorescence quenching kinetics are likely to involve static quenching, which is caused by specific interactions between NTSC-CDs and Fe 3+ toward the formation of a ground state complex. Due to their excellent optical performance, low toxicity, and good biocompatibility the NTSC-CDs may be applied to the imaging and monitoring of Fe 3+ in bacillus subtilis. In effect we successfully fabricated an effective fluorescent nanosensor for both the quantitative detection of Fe 3+ in aqueous solutions, and its real-time imaging in vivo.
研究领域:
分析化学
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生物医学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Guoyu Wei,Jiaxin Chen,Qunfeng Yue,Changhong Guo,Fengyu Qu,Huiming Lin
The pervasive presence of pathogenic bacteria in water environment poses a serious threat to public health. Here, a photocatalytic cascade was developed to reveal great water disinfection. Firstly, N -doped carbon nanosheets ( N -CNSs) about 30–50 nm in size were synthesized by a hydrothermal strategy. It revealed wide-spectrum photocatalysis for H 2 O 2 generation via a typical two-step single-electron process. A Fenton agent (Fe ion) was loaded, N -CNSs-Fe can in-situ convert photocatalytic H 2 O 2 into ·OH with high oxidation potential. Moreover, its Fenton active is three times greater than pure Fe 2+ owing to electron enrichment from N -CNSs to Fe for Fe 3+ /Fe 2+ cycle. Further investigation displayed that Fe loading also could decrease bad gap and promote charge separation to boost photocatalysis. In addition, N -CNSs-Fe possesses positive surface potential to exhibit strong interaction with negative bacteria, facilitating the capture. Therefore, the nanocomposite can effectively inactivate E. coli with a lethality rate of 99.7 % under stimulated sunlight irradiation. In addition, it also was employed to treat a complex lake water sample, revealing great antibacterial (95.1 %) and dye-decolored (92.3 %) efficiency at the same time. With novel biocompatibility and antibacterial ability, N -CNSs-Fe possessed great potential for water disinfection.
研究领域:
环境科学
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材料科学
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微生物学
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DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2023
·Vol. 52
·期 9
·5946-5954
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IF 2.1
Lu Yuting,Bian Zhenglan,Chu Fenghong,Lu Jianwei,Hou Guoqiang,Hou Shili
In this paper, a hydrothermal strategy is reported for the synthesis of nitrogen-doped carbon dots (NCD) which used citric acid (CA) and urea as reactants with different pristine molar ratios of carbon/nitrogen atoms (C/N). The fluorescence emission wavelength of the aqueous solutions of NCD can be tuned from 462 to 546 nm under a single and uniform UV light excitation (365 nm). Through many characterization analysis methods, it is demonstrated that graphitic N and C=O extended the effective conjugation length which reduced the energy gap between the highest occupied molecular orbital (HUMO) and the lowest unoccupied molecular orbital (LUMO). This is considered to be responsible for the redshift and tunability of the fluorescence emission of NCDs with different C/N molar ratios. This will be useful for designing a synthetic strategy of long-wavelength fluorescence emission carbon dots (CDs) in a non-benzene ring precursor system. As a potential fluorescence sensor, the as-prepared NCDs can specifically detect Fe 3+ ions and Al 3+ ions in aqueous solutions. Additionally, the NCDs not only are nontoxic but also exhibit large and stable fluorescence intensity, indicating that they have broad potential application in the fields of sensors and optoelectronic devices.
研究领域:
材料科学
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分析化学
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生物传感
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2015
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IF 2.912
Zhongfei Zhang,Boyan Gao,Xiaowei Zhang,Yuanrong Jiang,Xuebing Xu,Liangli (Lucy) Yu
This study investigated whether and how triacylglycerol (TAG) may serve as a precursor for 3-monochloro-1,2-propanediol (3-MCPD) fatty acid ester formation using tristearoylglycerol (TSG). TSG was reacted with inorganic chloride compounds including NaCl, KCl, FeCl2, CuCl2, ZnCl2, FeCl3 and dry HCl, or organic chlorine compound lindane at different temperatures. Only FeCl2 and FeCl3 were able to form 3-MCPD esters from TSG. Further electron spin resonance (ESR) determination of TSG, Fe2(SO4)3 and 5,5-dimethylpyrroline-N-oxide (DMPO) reactions revealed potential of Fe ion in promoting free radical generations under the experimental conditions. To further confirm the effect of Fe ion, chelating agent (EDTA-2Na) was added to the model reactions. The results showed for the first time that EDTA-2Na was able to reduce the generation of 3-MCPD esters. In addition, FT-IR examination indicated a possible involvement of a carbonyl group during the reaction. Taking all the observations together, the possible mechanisms, involving the formation of either a cyclic acyloxonium or a glycidol ester radical intermediate, were proposed for generating 3-MCPD fatty acid di- and mono- esters from TAG under a high temperature and low moisture condition, as well as the coformation of glycidol esters. The results from this study may be useful for reducing the level of 3-MCPD esters and related toxicants in the refined edible oils and food products.
研究领域:
食品科学
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毒理学
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化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Yingying Guo,Chenhui Wang,Yuhang Xiao,Xiaohong Tan,Weidong He,Jianpo Chen,Yan Li,Hao Cui,Chengxin Wang
Fe single-atom catalysts (SACs) have emerged as a promising alternative to platinum for catalyzing oxygen reduction reactions (ORR). Nevertheless, their practical applicability is hindered by insufficient stability caused by structural corrosion during ORR. Here, we developed an effective strategy to optimize and stabilize the Fe SAs (single-atoms) sites by implanting chromium (Cr) atomic clusters (ACs) to address the formidable deactivation issue of the best-performing yet unstable Fe-N-C catalysts. Cr AC -Fe 1 /N-S-C demonstrates an amazing stability with a negligible decline in activity after 100,000 CV cycles, and can maintain 81% of initial current after a continuous 50-hour operation period. Theoretical calculations and experimental evidence substantiate that the integration of Cr ACs not only weakens the binding of OH* to the Fe site, thereby facilitating the ORR process, but also eliminates in situ-generated reactive oxygen species (ROS) and retards Fe ion leaching from active sites, thus stabilizing of the Fe SA sites.
研究领域:
催化
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材料科学
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电化学
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2018
·
IF 0
Cheng Duan,Qiuxia Fu,Yang Si,Lifang Liu,Xia Yin,Feng Ji,Jianyong Yu,Bin Ding
Fabricating metal-chelating affinity materials with excellent protein adsorption and isolation properties is of great significance in numerous biotechnological fields, yet still face huge challenges. Herein, we successfully developed a new kind of nanofiber based metal-chelating affinity membranes by orderly modifying the electrospun regenerated cellulose nanofibrous membranes (RC NFMs) with intermediate bridging agent of cyanuric chloride (CC), chelating agent of iminodiacetic acid (IDA) and affinity ligand of Fe 3+ ions. The resultant Fe 3+ ions immobilized RC NFMs (RC-CC-IDA-Fe 3+ NFMs) exhibited a high lysozyme adsorption amount of 365 mg g -1 within the fast equilibrium adsorption time of 4 hours. Meanwhile, the performance of RC-CC-IDA-Fe 3+ NFMs could be facilely regulated by controlling the properties and concentration of protein solutions. Moreover, the obtained nanofibrous affinity materials also possessed superior cycle performance and excellent regeneration ability. Undoubtedly, the successful fabrication of efficient RC-CC-IDA-Fe 3+ NFMs might provide a new kind of affinity adsorbent for protein purification and other potential biotechnological fields.
研究领域:
生物技术
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材料科学
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产品关联
DOI
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2025
·
IF 3.5
Ziyao Zhao,Kuixian Wei,Hui Wu,Ning Tan,Wenhui Ma
Fluorescent silica nanoparticles (SiNPs) have application prospects in cell imaging, optoelectronic devices, and ion detection due to their excellent optical properties, low cytotoxicity, and diverse array of surface modification methods. However, their low product yield using current preparation processes limits their further development. In this study, a high-yield one-step microwave hydrothermal synthesis method of fluorescent silica nanoparticles (SiNPs) was developed using 3-thiocyanopropyl triethoxysilane (3-TCPTES) as the silicon source and sodium citrate as the reductant. The product yield was 91.1 %, and the quantum yield (QY) was 49.1 %. In addition, the mechanism of SiNPs fluorescence quenching by different ions was analyzed, and the quenching contribution ratio of different mechanisms was estimated. The results showed that this method greatly improved the yield of SiNPs while maintaining their excellent luminescent properties and low cytotoxicity, which provides a new method for the large-scale production of high-quality SiNPs. The unique functional group structure on the surface of SiNPs realized fluorescence quenching by changing the proportion of Fe 3+ and Hg 2+ ions via static quenching, fluorescence resonance energy transfer, and aggregation-caused quenching, giving them potential applications as fluorescent probes.
研究领域:
材料科学
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生物医学工程
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化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qiansheng Li,Hong Lu,Xiaolei Wang,Zhongqiang Hong,Ze Fu,Xinxin Liu,Jiti Zhou
Low solar energy utilization, instability of Fe ions and Fe(III)/Fe(II) cycle difficulty are three main factors, limiting the photocatalytic activity of the Fe/peroxymonosulfate (PMS) system. Herein, based on the N and Fe co-doped carbon dots (N, Fe-CDs) synthesized by a facile one-pot hydrothermal method, a new Fe(III)/Fe(II) cycle system for PMS activation under visible light irradiation was proposed. The characterization experiments showed that Fe has been successfully doped to the sp 2 graphitic structure and mainly existed as Fe-N and Fe-OH complexes, which played an important role in harvesting visible light, enhancing the stability of Fe ions and acting as active sites to accelerate electron transfer. Under visible light irradiation, the photogenerated electrons of N, Fe-CDs could be directly transferred to Fe (III) for Fe (II) formation via the ligand-to-mental charge transfer process, thus accelerating the Fe(III)/Fe(II) cycle. When N, Fe-CDs were used for activating PMS under visible light irradiation, aminopyrine could be efficiently degraded and mineralized to CO 2 via the cleavage of pyrazole ring, demethylation, hydroxylation, decarbonylation and the cleavage of benzene ring. The produced O 2 − and 1 O 2 played the main roles in the whole photocatalytic reaction. The above results revealed that the novel N, Fe-CDs could effectively activate PMS under visible light irradiation for the degradation of pharmaceuticals in the polluted water.
研究领域:
环境科学
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光催化
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水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
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