Nano Research
·
2022
·Vol. 16
·期 4
·5880-5886
·
IF 10.269
Tian Zhengbin,Deng Xiaohui,He Ping,Wang Guang-Hui
Monolithic catalysts play a crucial role in various catalytic applications, e.g., chemical synthesis, energy conversion, and environmental treatment, but their catalytic efficiency is often limited by the restricted mass transfer and insufficient exposure of active sites. Herein, we present a dual-templating strategy to fabricate atomic Pt dispersed on monolithic N-doped mesoporous carbon nanowires (Pt 1 /NMCW) with abundant super-/macropores, which, as monolithic catalyst, exhibits high catalytic performance in hydrogenation of 4-nitrophenol (4-NP). During synthesis, triblock copolymer (Pluronic F127) is employed as a primary soft template to generate the mesoporous structured carbon nanowires to improve the accessibility of Pt single sites; KCl crystallite is used as a secondary hard template to create the super-/macropores, which are beneficial for enhancing the mass transfer efficiency. Thanks to the dual-templating strategy that creates the monolithic carbon nanowires with hierarchically porous structure, the obtained Pt 1 /NMCW shows highly enhanced catalytic activity in 4-NP hydrogenation, outperforming its analogue synthesized without using KCl as template and being comparable to the nano-powder catalyst (i.e., atomic Pt loaded on the N-doped carbon nanospheres, Pt 1 /NCS).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 34
·26040-26049
·
IF 2.779
Liu Hongtao,Miao Xinyue,Wang Kelin,Gao Jieyu,Geng Hailong,Deng Xiong
The power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs) are affected by the presence of Pb-I antisite and I vacancy defects. Here, we propose a strategy for synchronous passivation of defects by Lewis bases D-Tryptophan methyl ester hydrochloride (D-TMe·HCl). The results show that the amino and carboxyl groups in D-TMe·HCl could synchronously passivate the Pb-I antisite and I vacancy defects through ionic and hydrogen bonding. In addition, the inhibition of ion migration of Pb 2+ and I − effectively suppresses charge recombination and promotes interfacial carrier extraction. As a result, the PCE of the device with D-TMe·HCl increased to 20.59% with a fill factor of 79.8%. Furthermore, the introduction of D-TMe·HCl promotes the crystallinity of the perovskite and obtains a more dense and uniform film, thus the stability of the device is enhanced. The device with D-TMe·HCl retains more than 94% of its initial PCE after aging in a glovebox for 500 h under nitrogen conditions. This work opens up a new avenue for achieving efficient and stable PSCs by forming high-quality films, synchronously passivating defects, and inhibiting ion migration.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 18
·4343-4352
·
IF 4.3
Liu Min,Wang Simin,Ge Wuxia,Bi Wentao,Chen David Da Yong
To systematically study the influence of host–guest interactions on the analytical performance of direct analysis in real time mass spectrometry (DART-MS), the interactions between cyclodextrins (CDs) and different Sudan dyes were investigated. The results showed that the host–guest interaction between CDs and Sudan dyes did not affect qualitative analysis of the target compounds, but led to a lower signal intensity for Sudan dyes, thus affecting quantitative analysis of the target compounds. The stronger the host–guest interaction, the weaker the signal intensity of target compound on DART-MS. The results also show that both in solution and in solid-phase microextraction (SPME), the addition of organic solvents can weaken the host–guest interaction between CDs and Sudan dyes, thus improving the signal intensity in DART-MS. In SPME, adding organic solvents has a certain practical value and can improve the efficiency of Sudan dye analysis. This study suggests that appropriate sample pretreatment is needed to weaken noncovalent interactions prior to DART-MS analysis to obtain more accurate quantitative results. The data provide some insight into the effects of other noncovalent interactions on the efficiency of DART-MS as an analytical tool, as well as the potential to study intermolecular interactions with DART-MS. Graphical Abstract
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MRS Advances
·
2023
·Vol. 8
·期 4
·103-107
·
IF 0.8
Martinez E. Gándara,Villarreal N. Elizondo,Coronado K. A. Chavez,Cuellar E. M. López,Hernández A. Guzman,Delgado D. Martínez,Delgado F. Paraguay
The aim of this work is the synthesis of SiO 2 nanoparticles starting from Tequila as green chemistry, which implies something novel. Tequila was used as a capping, a reducer, a surfactant and stabilizer from a solution of silicon tetraacetate, deionized water, acetone, and sodium hydroxide. The structure, optical absorption, and morphological analysis of these nanoparticles were studied using X-ray diffraction (XRD) and UV–Visible spectrophotometer, and TEM. The XRD analysis indicated an amorphous phase of SiO 2 nanoparticles; the size of the synthesized nanoparticle is about 20 ± 30 nm and optical absorption analysis indicated a peak in the 260 nm range. More than 175 constituents were found in Tequila and the most common constituents were 2-methyl-1-butanol and 3-methyl-1-butanol. These higher alcohols are a good disperser and they could not only increase the number of nucleation sites but also reduce the rate of grain growth. A green and cost-effective method for the synthesis of SiO 2 NPs using Tequila which focused on the utilization of a novel and original way, was demonstrated.
Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-12
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IF 2.8
Su Qi,Qu Jing-Jing,Liu Fei,Feng Ai-lin,Yuan Chang-Lai,Liu Xiao,Meng Liu-Fang,Ding Guo-An,Su Ming-wei,Chen Guo-Hua
A series of new systems of the SrCe 1- x Ti x O 3 and SrCe 1− x Zr x O 3 (SCT x and SCZ x , x = 0.0–0.1) ceramics have been prepared by the traditional solid-phase methods. The XRD patterns results show that an ABO 3 -type perovskite structure of the SrCeO 3 ceramic can be obtained as x = 0.0. With the increase in Ti 4+ - and Zr 4+ -ions-doping content of x = 0.02–0.1, the SCT x and SCZ x ceramics basically belong to the perovskite phase with the orthorhombic structure of the space group Pmcn (62), and the results of EDS analysis on the proportion of each element can also verify the correctness of the XRD analytical results. In addition, all the microstructures are dense for the SCT x and SCZ x ( x = 0.0–0.1) samples. The fitting results of complex plane impedance verified that the temperature stability of SCT x solid solution ceramics is more suitable for adjusting to the practical application range. Especially, the SCT x ( x = 0.03) ceramics sintered at 1270 °C for 4 h can obtain the relatively excellent dielectric properties of ε r = 50.16, Q × f = 8,940 GHz (at 5.91 GHz), and τ f = + 0.08 ppm/°C.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-11
·
IF 10.2
Wu Zhihua,Zhao De,Han Xin,Liu Jichang,Sun Ying,Li Yaogang,Duan Yourong
Background Superhydrophobic substrate modifications are an effective way to improve SERS sensitivity by concentrating analyte molecules into a small surface area. However, it is difficult to manipulate low-volume liquid droplets on superhydrophobic substrates. Results To overcome this limitation, we deposited a hydrophilic Ti 3 C 2 T x film on a superhydrophobic ZnO nanorod array to create a SERS substrate with improved analyte affinity. Combined with its interfacial charge transfer properties, this enabled a rhodamine 6G detection limit of 10 −11 M to be achieved. In addition, the new SERS substrate showed potential for detection of biological macromolecules, such as microRNA. Conclusion Combined with its facile preparation, the SERS activity of ZnO/Ti 3 C 2 T x suggests it may provide an ultrasensitive environmental pollutant-monitoring and effective substrate for biological analyte detection. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 14
·41910-41922
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IF 5.8
Li Xue,Chen Huichao
The use of mechanochemistry for the remediation of hexachlorobenzene (HCB)-contaminated soil was investigated. Additives such as alkaline materials, neutral materials, natural minerals, and solid waste were studied to explore their effect on the degradation of hexachlorobenzene in soil with single or combined addition by mechanochemical method. The best combination of materials were determined based on HCB destruction percentage by considering the impact on soil quality, the treatment cost, and the availability of additives. Scanning electron microscope (SEM) images and X-ray photoelectron spectrometer (XPS) analysis were conducted for the mechanism studies. The combination of albite and ferric oxide (Fe 3 O 4 ) was found to achieve the best performance in the degradation of HCB with the destruction percentage from 74.3 to 92.5% after 2-h and 6-h reaction, respectively. The developed fracture structure and complex compositions of albite provided abundant reaction sites for mechanochemical degradation of HCB in soil.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3687-3700
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IF 4.5
Gu Siqi,Xie Ping,Hu Zuming,Yu Junrong,Wang Yan,Li Na
Because of excellent insulation properties and thermal stability, meta-aramid paper can be commonly applied to a vast number of fields, like power systems. But poriferous and relatively lax structure of meta-aramid paper would limit its applications in high-voltage environment. This paper proposes a sandwich structure design to combine PDA@BNNS/PMIA film and meta-aramid paper with high breakdown strength. After coating with 6 wt% PDA@BNNS/PMIA solution, this kind of paper became more compact, so there were few pores in the paper and it further enhanced the mechanical and dielectric performances of specimens. The tensile strength in the cross direction increased from 31.3 to 40.5 MPa, and the performance in the machine direction was from 75.5 to 78.9 MPa. Furthermore, the breakdown strength of compound-coated paper achieved 55 kV/mm, which is much higher than meta-aramid paper. Additionally, compound-coated paper still remained outstanding thermal stability. Overall, our fabricated PDA@BNNS/PMIA compound-coated paper has excellent comprehensive properties, which provides a broad prospect for the applications in high-temperature and high-voltage transformers.
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FOOD SCIENCE AND BIOTECHNOLOGY
·
2023
·Vol. 32
·期 7
·903-909
·
IF 2.9
He Yangzheng,Chen Li,Liu Wenqun,Deng Ze-yuan,Li Jing
In this study, gas chromatography–mass spectrometry (GC–MS) coupled with Partial least squares Discriminant Analysis (PLS-DA) was used to analyze the volatiles in Chinese breast milk from different cities (Wuhan, Qingdao and Hohhot) and different lactation stages (colostrum and mature milk). The results showed that breast milk contained 122 volatile substances in 9 major groups, with the largest number of olefins (36) and the highest content of acids. The different volatile compounds of breast milk in three cities were heptanal, 2-pentylfuran, (E)-2,4-decadienal, (E)-2-heptenal, (E)-2-nonenal and 1-octen-3-one, colostrum and mature milk were (E)-2-heptenal, (E)-2-decenal, lauric acid, n -decanoic acid, (E)-2-nonenal and octanoic acid. This study might provide scientific data for the development and optimization of formulas that were more suitable for the health of Chinese infants.
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RARE METALS
·
2023
·Vol. 42
·期 5
·1614-1623
·
IF 8.8
Liu Shu-Ran,Luo Shu-Ting,Wu Xiao-Dong,Wang Tao-Jin,Ran Rui,Weng Duan,Si Zhi-Chun,Liu Shuang
In this work, silica-alumina mixed oxides with different SiO 2 contents (5% and 30%) were adopted as acidic supports for platinum catalysts for soot oxidation. The obtained catalysts were hydrothermally aged in 10% H 2 O/air at 750 °C for 20 h. The catalysts were characterized by X-ray diffraction (XRD), N 2 adsorption, inductively coupled plasma (ICP), CO chemisorption, NH 3 temperature-programmed desorption (TPD), infrared (IR) spectroscopy of CO adsorption, temperature-programmed oxidation (TPO) of NO, and TPD of NO x . The surface acidity of catalyst was positive correlated with the content of SiO 2 , which kept platinum in metallic and partially oxidized states in an oxidizing atmosphere. Compared with sulfation treatment on the alumina support, the application of SiO 2 –Al 2 O 3 mixed oxides does not result in the coverage of Pt active sites and the prepared catalysts exhibit excellent activity for NO oxidation. They promote NO x preferential adsorption on soot and decomposition of surface oxygenated compounds (SOCs) as the sulfated Pt/Al 2 O 3 catalyst does. Graphical abstract
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 5
·3008-3017
·
IF 2.1
Yu Hongquan,Deng Yutian,Chen Baojiu,Zhang Yong,Zhao Hong
BiFeO 3 , GdFeO 3 and GdFeO 3 /graphene nanofibers were successfully fabricated by using an electrospinning technique with a simple single needle. Their structure, size and morphology were investigated by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, and selected area electron diffraction. The diameters of the BiFeO 3 and GdFeO 3 are 60–70 and 80–170 nm, respectively. The electrochemical properties of the BiFeO 3 , GdFeO 3 , and GdFeO 3 /graphene nanofibers for lithium-ion battery applications were evaluated. The results indicate that the GdFeO 3 /graphene composite shows better electrochemical performance than BiFeO 3 and GdFeO 3 nanofibers.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 9
·1687-1698
·
IF 4.3
Liu Cheng,Zheng Jingtian,Zhang Benxing,Zhong Xianhua,Wang Wei,Li Zhangyong
The Fenton reaction is one of the most effective methods for treating organic wastewater, which is extremely harmful to humans but difficult to treat. However, finding simple, low-cost, and efficient catalysts for the Fenton reaction remains a challenge. In this study, a BSA-Cu 3 (PO 4 ) 2 hybrid nanoflower (NF) was synthesized to investigate its peroxidase-like activity for the treatment of organic wastewater. Its morphology, composition, and crystallization had been fully studied and the results confirmed that the NFs were successfully prepared. Subsequently, the origin of the peroxidase-like activity of the NFs was further analyzed, with the results suggesting two reasons: (i) the transformation between Cu(I) and Cu(II) and (ii) nano-effects. Additionally, Congo red was selected as the organic pollutant to simulate the decolorization of wastewater. After 3 h, the decolorization efficiency reached 96%. Furthermore, the NFs exhibited good storage performance, maintaining approximately 90% relative activity after storage for 30 days. In summary, the NFs have great application prospects in the treatment of organic wastewater. Graphical abstract
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