JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 1
·269-280
·
IF 2.647
Li Xueying,Wang Jiangang,Duan Fenyan,Tao Luwen,Xu Teng,Chen Lizhuang,Yuan Aihua,Wang Xiaolong
The electrode materials with long cycle life are important for the large-scale application of sodium ion batteries. In this work, P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0, 0.057, 0.073, 0.09) were synthesized by molten-salt method. The Ti doping content could influence the crystallographic unit cell volume, particle size, oxygen vacancies, and surface charge density of those samples. When x = 0.073, the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) exhibits superior reversible capacity and rate performance due to the appropriate synergistic effect. In particular, the initial discharge capacity of NCTO-0.073 is about 118.5 mAh g −1 at 100 mA g −1 . Even the current density gets to 1000 mA g −1 , the initial discharge capacity remains 71.7 mAh g −1 after 1000 cycling with the capacity retention of 67.90%. The electrochemical kinetics analysis further prove that the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) owns outstanding electrical conductivity and fast sodium ion diffusion behavior to promote the electrochemical reaction during the charging/discharging. These results will contribute to the industrialized application of stable high-performance cathodes for sodium ion batteries.
研究领域:
材料科学
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电化学
·
能量存储
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 14
·7276-7289
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IF 4.682
Wang Yonghan,Hu Feng,Chen Ying,Wang Hui,Fetohi Amani E.,Hao Yanan,Li Linlin,El-Khatib K. M.,Peng Shengjie
Electrocatalytic conversion from carbon dioxide with main products of carbon monoxide and hydrogen provides an economic and sustainable pathway to produce syngas, while the involved electrocatalysts with high activity and stability as well as highly tunability for CO/H 2 ratio are still rare. Here, we report a facile method to prepare palladium (Pd) nanoparticle ensembles with unique three-dimentional (3D) architecture and porosity as well as plenty of grain boundaries, which are electrocatalytically active for electrochemical carbon dioxide reduction (eCO 2 RR) to syngas. At the potential of − 0.8 V (versus reversible hydrogen electrode), the CO selectivity of such Pd nanoparticle ensembles is up to ca. 90% and the CO/H 2 ratio can be adjusted from one to six by varying the applied potentials. The syngas production on Pd nanoparticle ensembles can be further regulated by changing the reaction temperature and modified ligands. This method for fabricating Pd nanoparticle ensembles with rational tenability paves the way for the fundamental research and commercial deployment of eCO 2 RR and syngas production. Graphical abstract Pd nanoparticle ensembles with grain boundaries and high porosity were developed for tunable CO 2 conversion to syngas under ligand exchange and temperature control.
研究领域:
材料科学
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电化学
·
能源转换
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DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 6
·1711-1718
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IF 3.186
Wu Shaohua,Su Tongtong,Liu Senqun,Cheng Dan,Zeng Rong,Ma Xiaohua,Liang Sanqi,Ding Shunmin,Chen Chao
Developing an ideal stabilizer to prevent the aggregation of nanoparticles is still a big challenge for the practical application of noble metal nanocatalysts. Herein, we develop a charge (NTf 2 − ) modified porous organic polymer (POP-NTf 2 ) to stabilize ultrasmall platinum nanoparticles. The catalyst is characterized and applied in the catalytic dehydrogenative coupling of silanes with alcohols. The catalyst exhibits excellent catalytic performance with highly dispersed ultrasmall platinum nanoparticles (ca. 2.22 nm). Moreover, the catalyst can be reused at least five times without any performance significant loss and Pt NPs aggregation. Graphic Abstract
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6689-6703
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IF 4.22
Cao Yanming,Zhang Dongbin,Kong Xianggui,Zhang Fazhi,Lei Xiaodong
Abstract Introducing anion and cation vacancies into Co-based oxides is a promising strategy to promote their catalytic activity. However, the mild and effective methods for synthesizing cobalt oxide and vacancies are rarely proposed. In this work, via an innovative one-step hydrothermal process, we synthesized Co 3 O 4 -based catalyst, which was successively proven rich with oxygen vacancies (V O ) and cobalt vacancies (V Co ). As an electrocatalyst for benzyl alcohol (BA) oxidation, the vacancy-rich Co 3 O 4 on nickel foam (NF) with optimized electronic structure displayed a super high conversion (> 99%) and selectivity (> 99%) for benzoic acid (BAc) with excellent recyclability, representing one of the best Co‐based catalysts. X-ray photoelectron spectroscopy (XPS) and X-ray adsorption near-edge structure (XANES) technologies coupled with density functional theory calculations (DFT) demonstrated the obvious electronic delocalization caused by vacancies not only lowered the adsorption energy of BA and improved the intrinsic activity of catalytic Co sites for faster reaction kinetics, but also narrowed the band gap for better electrical conductivity. This work opens up a new simple synthetic idea to construct the high-performance electrocatalysts by tuning electronic structure. Graphical abstract
研究领域:
材料科学
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电化学
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催化
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化工
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DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2021
·Vol. 34
·期 4
·1165-1176
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IF 1.506
Sun Xiaoning,Song Kun,Wang Song,Sun Kangning
Fe 3 O 4 nanoparticles/iodized oil magnetic fluids (FIOMFs) have showed potential in targeted hyperthermia for liver tumors; in this paper, FIOMFs were simply and conveniently prepared by dispersing the synthesized hydrophobic Fe 3 O 4 nanoparticles (FNPs) in iodized oil; the stability, magnetothermal effects, and the biotoxicity of FIOMFs were evaluated. The results showed that the stability of FIOMFs was mainly influenced by the morphology and the size of FNPs. FNPs prepared with FeCl 3 ·6H 2 O, oleylamine (OAm), ethylene glycol (EG), and stearic acid exhibited the best suspension stability, which could suspend in iodized oil stably for a long time. Depending on the FNP content and the parameters of the alternating magnetic field (AMF), the temperature of FIOMF in AMF can reach up to more than 70 °C within 60 s, exhibited excellent magnetothermal effects. The in vitro cytotoxicity tests indicated the cytotoxicity of FNPs is mainly influenced by its concentration in cells.
研究领域:
医学
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材料科学
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生物医学工程
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DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1587-1597
·
IF 5.044
Liu Xiaohong,Li Ming,Zhang Haichuan,Chen Liheng,Fu Shiyu
A cellulose- grafted -poly( N -isopropylacrylamide) (cellulose- g -PNIPAAm) copolymer with thermo-responsivity was synthesized using homogeneous activators regenerated by electron transfer for atom transfer radical polymerization (ARGET-ATRP). The prepared copolymer dispersed at low concentration in water or phosphate-buffered saline (PBS) at 25 °C could self-assembly into micelles at 37 °C. The size and morphology of these micelles were determined by dynamic light scattering and transmission electron microscopy. The copolymer at a concentration over 4.2% by weight in water formed an injectable thermo-responsive hydrogel that was composed of micelles when the temperature increased to 37 °C. This hydrogel was used to load the anticancer drug doxorubicin (DOX). In vitro release studies demonstrated that this hydrogel released DOX in a sustained manner. Furthermore, this cellulose-based injectable thermo-responsive hydrogel was used in cytotoxicity tests, revealing that it was very biocompatible. Based on the above results, this cellulose- g -PNIPAAm injectable thermo-responsive hydrogel has strong potential for application in smart drug delivery systems.
研究领域:
材料科学
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生物医药
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高分子化学
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DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 6
·1429-1438
·
IF 2.413
Duan Hui-Ling,Mou Zhao-Li,Wang Jun,Ma Shi-Yao,Zhan Han-Ying,Zhang Zhi-Qi
Two types of magnetically modified porous β-cyclodextrin polymers (PCDPs) were successfully synthesized. The first type, named MPCDPs(C), was fabricated by co-precipitating PCDPs with Fe 3 O 4 , resulting in a Brunauer–Emmett–Teller (BET) surface area of 106.68 m 2 g −1 . The second type, named MPCDPs(M), was fabricated by grafting PCDPs onto the surface of magnetic microspheres, resulting in a BET surface area of 34.63 m 2 g −1 . Both MPCDPs were found to enable effective extraction and separation of Sudan dyes from foodstuffs and environmental water. Coupled with high-performance liquid chromatography, the limits of detection for Sudan dyes were in the range of 0.013–0.054 ng mL −1 with MPCDPs(C), and 0.028–0.039 ng mL −1 with MPCDPs(M). Recoveries were between 85.8 and 102.8% for spiked food samples and 88.3 and 103.2% for spiked water samples, suggesting that the developed methods are promising for accurate quantification of Sudan dyes at trace levels in foodstuffs and environmental water.
研究领域:
分析化学
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食品科学
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环境科学
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DOI
高影响因子
International Journal of Environmental Research
·
2022
·Vol. 16
·期 2
·1-12
·
IF 3.229
Tan Mengyu,Sun Yue,Gui Jiaxi,Wang Jingli,Chen Xu,Wu Donglei
Plastics are common raw materials of products originating from human activities. Their physical nature may include disintegrated small granules or fragments with particle size less than 5 mm—microplastics (MPs) which are considered as emerging contaminant in the environment. Previous research has demonstrated that organic solid waste (OSW) was contaminated by microplastics. Subsequent to biological treatment, OSW products such as compost and biogas residues would be mixed the soil as fertilizers or conditioners; while, the MPs in these OSW would also enter the soil at the same time, imparting potential ecological risks. Thus, it is important to detect the MPs in biologically treated OSW products. However, it was unknown whether some of the digestion and separation methods could be used to effectively extract MPs in these typical OSW, limiting the research on MP abundance in these OSW and restricting the comparability of relevant studies. Therefore, the present study compared the effects of seven digestion protocols on the MPs and organic matter, and the most suitable protocol containing 30% (v/v) H 2 O 2 was determined. Furthermore, the recovery rates of spiked MPs were used to evaluate three separation methods. The results showed that the two-stage density separation of NaCl solution (ρ = 1.19 g·cm −3 ) and NaBr solution (ρ = 1.53 g·cm −3 ) was optimal, and the recovery rate of spiked MPs by two-stage density separation was higher than 86%. Based on these results, the scheme of “30% (v/v) H 2 O 2 pretreatment and two-stage density separation” was constructed for MPs extraction from biologically treated products of OSW, which could be applied to the related studies.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Yao Yueliang,Tse Yuen Cheong,Lai Samuel Kin-Man,Shi Yixiang,Low Kam-Hung,Au-Yeung Ho Yu
Responsive synthetic receptors for adaptive recognition of different ionic guests in a competitive environment are valuable molecular tools for not only ion sensing and transport, but also the development of ion-responsive smart materials and related technologies. By virtue of the mechanical chelation and ability to undergo large-amplitude co-conformational changes, described herein is the discovery of a chameleon-like [2]catenane that selectively binds copper(I) or sulfate ions and its associated co-conformational mechanostereochemical switching. This work highlights not only the advantages and versatility of catenane as a molecular skeleton in receptor design, but also its potential in constructing complex responsive systems with multiple inputs and outputs.
研究领域:
超分子化学
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分子识别
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
PHARMACEUTICAL RESEARCH
·
2024
·
IF 3.5
Yu Ying,Wang Li Yun,Liu Yan Chi,Cui Hao,Yuan Cheng,Wang Cheng Xiao
Background Panax notoginseng saponins (PNS) are commonly used first-line drugs for treating cerebral thrombosis and stroke in China. However, the synchronized and targeted delivery of active ingredients in traditional Chinese medicine (TCM) poses a significant challenge for modern TCM formulations. Methods Bovine serum albumin (BSA) was modified using 2-methacryloyloxyethyl phosphorylcholine (MPC), an analog of acetylcholine, and subsequently adsorbed the major PNS onto the modified albumin to produce MPC-BSA@PNS nanoparticles (NPs). This novel delivery system facilitated efficient and synchronized transport of PNS across the blood–brain barrier (BBB) through active transport mediated by nicotinic acetylcholine receptors. Results In vitro experiments demonstrated that the transport rates of R 1 , R g1 , R b1 , and R d across the BBB were relatively synchronous in MPC-BSA@PNS NPs compared to those in the PNS solution. Additionally, animal experiments revealed that the brain-targeting efficiencies of R 1 + R g1 + R b1 in MPC-BSA@PNS NPs were 2.02 and 7.73 times higher than those in BSA@PNS NPs and the free PNS group, respectively. Conclusions This study presents a simple and feasible approach for achieving the targeted delivery of complex active ingredient clusters in TCM.
研究领域:
药学
·
神经科学
·
中药学
✓ 已验证
DOI
PubMed
高影响因子
Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-12
·
IF 7.9
Xu Zhenjin,Wu Dezhi,Chen Zhiwen,Wang Zhongbao,Cao Cong,Shao Xiangyu,Zhou Gang,Zhang Shaohua,Wang Lingyun,Sun Daoheng
The tactile pressure sensor is of great significance in flexible electronics, but sensitivity customization over the required working range with high linearity still remains a critical challenge. Despite numerous efforts to achieve high sensitivity and a wide working range, most sensitive microstructures tend to be obtained only by inverting naturally existing templates without rational design based on fundamental contact principles or models for piezoresistive pressure sensors. Here, a positive design strategy with a hyperelastic model and a Hertzian contact model for comparison was proposed to develop a flexible pressure sensor with highly customizable linear sensitivity and linearity, in which the microstructure distribution was precalculated according to the desired requirement prior to fabrication. As a proof of concept, three flexible pressure sensors exhibited sensitivities of 0.7, 1.0, and 1.3 kPa − 1 over a linear region of up to 200 kPa, with a low sensitivity error (<5%) and high linearity (~0.99), as expected. Based on the superior electromechanical performance of these sensors, potential applications in physiological signal recognition are demonstrated as well, and such a strategy could shed more light on demand-oriented scenarios, including designable working ranges and linear sensitivity for next-generation wearable devices.
研究领域:
柔性电子
·
传感器技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 10
·1-9
·
IF 2.8
Xue Ying,Wang Zhuo,Li Yanxin,Yi Zhihui,Li Xin,Wu Dan
The abundant requirements of smart terminals promote the rapid development of dielectric materials to further realize the integration and miniaturization of electronic devices. In this work, based on a solid-state reaction method, (In 0.5 Ta 0.5 ) 0.1 Ti 0.9 O 2 (ITTO) ceramics with dense microstructure, colossal permittivity of 1.18 × 10 5 , and ultralow dielectric loss of 0.0072 were obtained at 1 kHz and room temperature. In addition, the temperature coefficient stability and range of the ITTO ceramics were between ± 3.3% and − 100 to 235 °C, satisfying X9D (− 55 to 200 °C, Δ ε r / ε 25°C < ± 3.3%) requirement at 1 kHz. The dielectric mechanisms could be connected to the electron hopping and internal barrier layer capacitor (IBLC) effects. Thus, the acquired ITTO ceramics have advanced advantages with excellent dielectric properties and temperature stability in the practical applications of microelectronic fields.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）