MOLECULES
·
2024
·Vol. 29
·期 6
·1369
·
IF 4.2
Rui Yu,Xiaoyan Lu,Zhenjiang Lu,Yali Cao
The development of electrode materials with excellent performance serves as the key for researchers to enhance the energy density of supercapacitors. Cobalt molybdate (CoMoO4) nanomaterials have been regarded as one of the most prospective electrode materials for supercapacitors due to their high theoretical capacitance and excellent electrical conductivity. In this paper, three kinds of CoMoO4nanorods were prepared directly via simple and environmentally friendly solid-phase chemical reactions with solid inorganic salts as raw materials. According to X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) test results, different reagents had certain effects on the size and morphology of CoMoO4, and these affected its electrochemical performance. In particular, the samples prepared with Co(NO3)2·6H2O as raw material took on a more uniform micromorphology, with a better crystallinity. Simultaneously, electrochemical test results showed that the samples synthesized with Co(NO3)2·6H2O presented relatively good electrical conductivity and a large specific capacitance (177 F g−1). This may be due to the nitrates reacting more slowly during the reaction and the crystals having difficulty aggregating during growth. Therefore, the structure of the prepared CoMoO4nanomaterial was more uniform, and it was resistant to collapse during the charging and discharging process; thus, the capacitor presents the best performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Lianzheng Yu,Zhiwei Cheng,Kang Xu,Yu-Xin Chang,Yi-Hu Feng,Duo Si,Mengting Liu,Peng-Fei Wang,Sailong Xu
Biphasic hybridization of layered cathode materials for sodium-ion batteries (SIBs) is crucial to enhance storage performances. The synergistic effect of biphases is generally considered to underlie the enhancement, yet the in-depth mechanism underneath remains unclear, in particular at high-voltages (> 4.2 V, vs Na + /Na). Herein, a unique high-voltage-stable P2/O3 composite layered oxide-Na 0.85 Ni 0.34 Mn 0.33 Ti 0.33 O 2 with a specific proportion (P2:O3 = 24.8%:75.2%) is reported via tuning the amounts of Ti substitution in Na 0.85 Ni 0.34 Mn 0.66-x Ti x O 2 . Operando X-ray diffraction reveals that the biphasic Na 0.85 Ni 0.34 Mn 0.33 Ti 0.33 O 2 cathode successfully restrains the formation of O2 phase and undergoes completely reversible structural evolution of P2/O3–P2/P3–OP4/OP2 upon being charged to a high voltage of 4.4 V. Moreover, the interlocking effect between the phase boundaries is revealed to effectively mitigate the severe structural strain and large lattice volume change, thus further raising its structural stability under the high-voltage regions. Consequently, the obtained biphasic P2/O3-Na 0.85 Ni 0.34 Mn 0.33 Ti 0.33 O 2 cathode exhibits an excellent capacity retention of 80.6% at 1C after 200 cycles. More importantly, the full cell fabricated with hard carbon anode achieves a high energy density of 294.6 Wh kg −1 . These results highlight the excellent electrochemical performance of biphasic cathode materials and also grasp new insight into designing composite structure materials for SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 39
·期 5
·573-584
·
IF 3.154
Sun Xu,Shi Wei,Zhou Xin-Yu,Ding Sheng
With the exploration of novel sustainable protocol for functional polyamides’ (PAs) construction as the starting point, herein, the small molecular model compound (M1-ssBIC) was prepared firstly by manual grinding of monofunctional benzoxazine (1a) and isocyanide (1b) via solid-state benzoxazine-isocyanide chemistry (ssBIC) to evaluate the feasibility of ssBIC. Linear PAs (P1-series polymers) were subsequently synthesized from biunctional benzoxazine (2a) and isocyanide (2b), and the influence of the loading of catalyst (octylphosphonic acid) (OPA) on the polymerization was investigated. Afterwards, two kinds of cross-linked PAs were successfully constructed via ssBIC by using trifunctional benzoxazine (3a) and cross-linked polybenzoxazine (4a) as reaction substrates, respectively, thus verifying the adaptability of ssBIC. Structural characterization indicates that amide, phenolic hydroxyl and tertiary amine substructures, with metal-complexing capability, have been successfully integrated into the obtained PAs. A type of representative PA/silver composite (P3-AgNPs) was prepared subsequently via in situ reduction treatment, and its application as recyclable reduction catalyst for organic pollutant p-nitrophenol (4-NP) was preliminarily investigated here to provide the example for possible downstream application of ssBIC. We think that this current work could provide a new pathway for the construction of functional PAs through facile and sustainable ssBIC protocol.
研究领域:
材料科学
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有机化学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 37
·23956-23962
·
IF 4.036
Wenyuan TAN,Qi Chen,Rong Wang,Zhuqing Wang,Huan Zhang,Yuran Wu
Based on the gas–liquid phase chemiluminescence tester independently developed by our laboratory, a highly sensitive, fast and accurate on-line detection method of formaldehyde gas in ambient atmosphere is established. The chemiluminescence system and the trace formaldehyde gas in the air directly undergo an interface heterogeneous chemiluminescence reaction to obtain a strong chemiluminescence signal. Through the measurement of the chemiluminescence signal intensity, a highly sensitive, real-time and on-line method for the determination of formaldehyde in the air was established. Factors influencing the experimental results such as gallic acid, potassium dichromate, reaction medium concentration, surfactant type and concentration, pump speed, tube length, and interfering gas were discussed based on the single factor and orthogonal analysis results. Finally, the optimal detection conditions were collected, and the detection results were compared with the national standard phenol reagent method. The results show that when the concentration of the standard formaldehyde gas is in the range of 0–0.582 μg L−1, the linear equation of this method is y = 208x + 29.667, the linear coefficient is R2 = 0.997, and the minimum detection concentration of formaldehyde is 2.327 × 10−3 μg L−1. Under the same external conditions, the comparison and analysis using the national standard phenol reagent method proved that this method has the advantages of fast detection speed, low detection limit, good sensitivity, and accurate results, which can be used for real-time and online determination of trace formaldehyde in ambient air.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Liangli Li,Maohua Yang,Mei Zhang,Mingyan Jia
As an important antitussive and expectorant herbal medicine, Fritillariae cirrhosae bulbus (FCB) is rare and expensive, leading to massive adulterations in the market. Herein, we report a solid colorimetric sensor array (CSA) method for the rapid identification of FCB and its adulterations. This CSA was fabricated by printing nine pH indicators on a mixed cellulose ester membrane via a commercially available inkjet printer filled with polyethylene glycol-containing ink. This CSA displayed color changes to various analytes, as their solution of varied pH values triggers chemical reactions with the nine pH indicators (and other potential interactions). The digital database of these colorimetric response patterns was collected automatically using a homemade program. The outstanding identification capability of the CSA was confirmed via the analysis of 1,2-diols and catechols. The principal component analysis result demonstrated that this CSA could distinguish pure FCB powder from its six common adulterations. The linear discriminant analysis models were established for the qualitative identification of adulterated FCB samples with 89.58 %− 100 % accuracy. Furthermore, partial least squares regression models were developed for the quantitation of adulterant percentages with correlation coefficients higher than 0.87. We expect that the inkjet-printed CSA provided an effective on-site screening method for identifying adulterated FCB.
研究领域:
中药学
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分析化学
✓ 已验证
DOI
高影响因子
Pharmaceutics
·
2022
·Vol. 14
·期 10
·2147
·
IF 6.525
Zhijun Guo,Dan Sun,Xian Zhou,Huan Xu,Yizhou Huang,Chenglin Chu,Baolong Shen
In this work, a facile direct current atmospheric pressure micro-plasma (APM) technology was deployed for the synthesis of functional gold nanoparticle/chitosan (AuNP/CS) nanocomposites for the first time. Different experimental parameters, such as metal salt precursor concentration and chitosan viscosity, have been investigated to understand their effects on the resulting nanocomposite structures and properties. The nanocomposites were fully characterized using a wide range of material characterization techniques such as UV–vis, transmission electron microscope (TEM), Fourier transform infrared (FTIR) spectra and X-ray photoelectron spectroscopy (XPS) analyses. Potential reaction pathways have been proposed for the nanocomposite synthesis process. Finally, potential of the synthesized nanocomposites towards photothermal conversion and bacteria eradiation applications has been demonstrated. The results show that APM is a facile, rapid and versatile technique for the synthesis of AuNP/CS functional nanocomposites. Through this work, a more in-depth understanding of the multi-phase system (consisting of gas, plasma, liquid and solid) has been established and such understanding could shine a light on the future design and fabrication of new functional nanocomposites deploying the APM technique.Keywords:atmospheric pressure micro-plasma;plasma induced liquid chemistry;gold nanoparticles;chitosan;nanocomposites;photothermal conversion;antibacterial
研究领域:
材料科学
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生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Sustainable Metallurgy
·
2024
·Vol. 10
·期 2
·893-902
·
IF 2.5
You Conglin,Li Dongdong,Fan Yanfei,Gao Dandan,Han Li,Zeng Dewen
Lithium aluminum layered double hydroxide chlorides (LADH-Cl) are the only industrial-level lithium sorbents. However, as an applied material, the composition-structure-property-performance relation is far from well constrained, leaving the manufacture and application of LADH-Cl lithium sorbents empirical rather than rational. Herein, we studied the phase evolution of gibbsite phase Al(OH) 3 in concentrated LiOH aqueous solution, suggesting the formation of lithiated lithium aluminum layered double hydroxide (LADH-OH) with Al:Li molar ratio 2. However, LADH-OH is not an active ingredient as a lithium sorbent. The neutralization of LADH-OH with a dilute HCl aqueous solution resulted in the formation of the active LADH-Cl phase. Unlike the traditional LADH-Cl phase (g-LADH-Cl) generated from direct LiCl intercalation of gibbsite, LADH-OH derived LADH-Cl (b-LADH-Cl) has a topological parent of bayerite instead of gibbsite. This is one of the most important roots for different performances. Another source for the different performance is very likely from variations of the particle size and morphology when the raw gibbsite reacted with LiCl or LiOH aqueous solution. Nevertheless, we found that the limiting-delithiation of b-LADH-Cl is still the same as g-LADH-Cl, that is only maximum 1/3 lithium can be delithiated from the LADH-Cl phase without any decomposition into gibbsite or bayerite. This concluded that b-LADH-Cl and g-LADH-Cl have the same reversible lithium “sorption–desorption” capacity, even through different lithium affinity and sorption kinetics. Also, notably, the “sorption–desorption” performance of the optimal sorbent is very sensitive to the properties of service brines. These results substantially enlarged our knowledge of the LADH-Cl phase and provided a demo of the rational manufacture of lithium sorbent. Graphical Abstract
研究领域:
材料科学
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化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yafei Guo,Chang Tan,Peng Wang,Jian Sun,Weiling Li,Chuanwen Zhao,Ping Lu
Magnesium-based adsorbents present great potential in separating CO 2 from flue gas stream. To satisfy the requirement of efficient CO 2 capture, it is imperative to select suitable methods for preparing MgO adsorbents with good physicochemical properties. In this study, MgO adsorbents were prepared with different methods using MgCl 2 ·6H 2 O as magnesium precursor, and the effect of synthesis method on their structure-performance relationships were investigated. It is found that MgO adsorbents prepared with different methods exhibited varied physicochemical properties, and these were associated with their diverse CO 2 adsorption capacities. Amongst the different MgO adsorbents, the sample prepared with the solid-state chemical reaction method (MgO-SR) featured good textural properties (high specific surface area and total pore volume of 100.03 m 2 /g and 0.67 cm 3 /g), preferable surface morphology (sheet-like structure with reduced layer diffusion resistance) and excellent CO 2 adsorption capacity (2.39 mmol CO 2 /g). The solid-state chemical reaction method endowed the adsorbent with abundant surface basic active sites, and CO 2 molecules interacted with the weak sites (OH group), medium sites (Mg-O pairs) and strong sites (O 2− ) to form stable bicarbonate, bidentate and unidentate carbonates. The experimental CO 2 uptakes were in good agreement with the values predicted by the Avrami fractional kinetic model. Physical adsorption and chemisorption coexisted in the CO 2 adsorption process and the chemisorption sites played a dominant role. The approach enlightens the facile fabrication of cost-effective MgO adsorbents from waste precursors for large-scale CO 2 capture applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2016
·
IF 3.48
Zuhua Zhang,John L. Provis,Jin Zou,Andrew Reid,Hao Wang
Variations between fly ashes can lead to significant differences in the geopolymers derived from them, in both microstructural and mechanical properties. This study assesses the effect of physical, crystallographic and chemical characteristics of fly ash on geopolymerisation performance and the strength of the resulting binders. Physical and glass chemistry factors are combined to develop a comprehensive index to evaluate the suitability of fly ashes for the production of high-strength geopolymers. An equation for this index is proposed, developed using five typical low-calcium fly ashes and then validated against a further eight literature datasets, showing a good relationship between the ranking order of the calculated index and the compressive strengths of geopolymer pastes produced with comparable activator and paste workability. This index can be used to screen the source materials, which is of significant value in moving alkali activated cements towards acceptance in practice.
研究领域:
材料科学
·
硅酸盐化学
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建筑材料
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固废资源化
·
胶凝材料化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jindou Hu,Yali Cao,Jing Xie,Dianzeng Jia
To reduce the cost of the traditional noble metal-loaded photocatalysts for H 2 production, low-cost Ni(OH) 2 -TiO 2 nanocomposites were designed and synthesized by a simple room-temperature solid-state chemical method (RSCM), which is a facile, low-cost and eco-friendly manipulation. Various testing methods and tools were used to characterize the crystal structure, elemental composition, morphology, light absorption ability, fluorescent performance, photocurrent density, and photocatalytic activity of the obtained nanocomposites. The results indicated that RSCM can be used to synthesize Ni(OH) 2 -TiO 2 nanocomposites with a small size (50 nm) and good dispersity. Compared to pure TiO 2 , the obtained nanocomposites displayed excellent photocatalytic performance for H 2 production by photocatalytic water-splitting. The amount of hydrogen needed for the optional nanocomposite NOT-1 was 9180 μmol/g, which is 29 times that of the commercial P25. The reason for the improved performance for photocatalytic hydrogen production is that the existing Ni(OH) 2 in nanocomposites promoted the separation between the photogenerated electron and holes.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Earth and Space Chemistry
·
2021
·
IF 3.475
Xiaozhong Fang,Yangyang Liu,Kejian Li,Tao Wang,Yue Deng,Yiqing Feng,Yang Yang,Hanyun Cheng,Jianmin Chen,Liwu Zhang
The carbonate radical (CO3•–) has been proved to be of great significance in the water environment. However, a few studies concerned with its contribution to atmospheric heterogeneous chemistry. Here, we report the pathway for the first time for CO3•– generation by interfacial photogenerated hole/hydroxyl radical (•OH) transfer between the photoactive component and (bi)carbonate (CO32–/HCO3–) of mineral dust under atmospherically relevant actinic irradiation. By combining laboratory simulation, nanosecond transient absorption spectroscopy (NTAS), and field observation, we demonstrate that (bi)carbonate in the atmosphere not only has a pH buffering effect in the uptake of NO2 but more importantly directly participates in the photochemical reactions by generating CO3•– under irradiation. CO3•– can play an important role by facilitating nitrite transformation to nitrate, especially under a lower light intensity (15 mW/cm2) and a higher humidity (60% RH). Diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) was used to detect the surface species generated on simulated mineral dust. Under irradiation, the time-dependent reactive uptake coefficient for the first-order reaction of NO2 uptake on simulated mineral dust was found to be 2.817 × 10–8 × e–t/6559. These results highlight the important role of CO3•– in atmospheric photochemistry, which could act as a reactive radical and influence secondary aerosol formation.
研究领域:
大气化学
·
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）