ELECTROCHIMICA ACTA
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2023
·
IF 6.6
Gaoxing Sun,Shuxin Zhuang,Yuqing Sun,Xiaoxiao Pan,Shengyu Jiang,Yan Ren,Bin Zhu,Xiaodan Li,Yanfen Wen
Although lithium-ion cathode materials with crystal structure are extensively applied, many intrinsic problems are inevitable, such as the low capacity ascribed to the need to sacrifice a large amount of active Li to maintain the crystal structure, and the spontaneous irreversible phase transition of the crystal during the cycles, which will lead to the deterioration or even inactivation of the crystal structure, resulting in poor cyclic stability of the crystal material. Herein, an amorphous nickel fluorosulfate cathode material (a-LNSF) is fabricated by a simple mechanical ball grinding method and compared with the electrochemical properties of LNSF with crystal structure. Comparing with LNSF, a-LNSF exhibits a high discharge specific capacity of 238.5 mAh/g at a current density of 0.1 C, and the specific capacity is still 118.3 mAh/g under a high current density of 10 C. Moreover, the capacity retention ratio is 85.7 % after 300 cycles at the current density of 1 C. a-LNSF achieves satisfactory electrochemical properties attributed to its inherently advantages of the amorphous structure. Theoretical calculations coupled with experiments to further explore the reason of superior electrochemical properties of a-LNSF, and an additional electrochemical reaction mechanism for capacity accumulation were discovered. Interestingly, the directional reversible migration of F-ions (stemming from the a-LNSF) between bulk material and carbon nanotubes is accompanied by the process of charge and discharge, the C-F ionic bonds with excellent reversibility and electronic conductivity are formed to improve the comprehensive electrochemical properties of a-LNSF during the charge/discharge processes.
研究领域:
材料科学
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电化学
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储能
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电池技术
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DOI
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Can Cui,Rupeng Zhang,Chuankai Fu,Baoyu Sun,Yang Wang,Hua Huo,Yulin Ma,Yunzhi Gao,Geping Yin,Pengjian Zuo
As one of the most promising next generation energy storage systems, lithium sulfur (Li-S) batteries with high specific energy density have received extensive attention due to the advantages of resource abundance, low toxicity and super high specific energy density (>2500 Wh kg −1 ). However, the unfavorable shuttle effect caused by dissolved polysulfides during charging/discharging processes results in low Coulombic efficiency (CE), poor interfacial stability, uncontrolled lithium dendrite growth and rapid capacity degradation, hindering the practical application of Li-S batteries. Herein, a highly stable armor-like artificial solid electrolyte interphase (SEI) layer for Li metal anode was formed based on the spontaneous interaction between Li metal and 4-chlorophenylboronic acid (CPB). First, this artificial SEI layer can avoid the direct contact between Li anode and electrolyte, therefore eliminating the corrosion reaction between Li metal anode and polysulfides in electrolyte. Second, the artificial SEI layer with high durability can effectively suppress lithium dendrite growth and stabilize Li anode/electrolyte interface. As consequence, the Li/Li symmetric cells show the lengthened cycling life over 500 h with steady and low polarization voltage under the condition of 1.0 mA cm −2 for 1.0 mAh cm −2 . Furthermore, the Li-S cells with modified Li metal anode deliver superior cycling performance and higher CE at various sulfur loadings and rate conditions than those of the cells with pristine Li. This work highlights the key role of artificial SEI layer on stabilizing the Li anode, providing a new pathway for Li metal protection in Li-S batteries development.
研究领域:
储能
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材料科学
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电化学
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电池技术
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 62
·35948-35956
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IF 3.049
Yue Pan,Weijia Zeng,Rong Hu,Bo Li,Guiling Wang,Qintang Li
Cu foil is widely used in commercial lithium ion batteries as the current collector of anode materials with excellent conductivity and stability. In this research, commercial Cu foil was chosen as the current collector and substrate for the synthesis of Cu doped flake-NiO via a traditional hydrothermal method. The effect of the ratio of Cu and the calcination temperature on the electrochemical performance of NiO was investigated. The structure and phase composition of the Cu doped flake-NiO electrode were studied through X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and inductive coupled plasma emission spectrometry (ICP). The electrochemical properties of the Cu doped flake-NiO electrode were studied through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and a galvanostatic charge–discharge cycling technique. According to the results, the Cu-doped NiO electrode, calcined at 400 °C with a molar ratio of Cu : Ni = 1 : 8, exhibited a high reversible charge capacity. The good cycling stability and rate performance indicate that the as-prepared electrode can be applied as a potential anode for lithium ion batteries.
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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纳米材料
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电池技术
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DOI
高影响因子
COMBUSTION AND FLAME
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2021
·
IF 4.185
Qianjin Lin,Chun Zou,Shibo Liu,Yunpeng Wang,Lixin Lu,Chao Peng
The ignition delay times (IDTs) of 2-pentanone (methyl propyl ketone , MPK) were measured at equivalence ratios of 0.5, 1.0, and 1.5, pressures of 1 bar and 5 bar, and temperatures ranging between 1227 and 1571 K. A MPK low to high-temperature model was constructed on the basis of Pieper model and Fenard model. The improvement of the model is that the rate constants of sixteen MPK decomposition and hydrogen abstraction reactions (R1–R16) obtained by the analogy-based method, were globally optimized by the Bayesian Optimization algorithm using the high-temperature IDTs. The optimized model well predicts the laminar flame speeds (measured by Li et al.) and the IDTs and species profiles in low-temperature (measured by Fenard et al.). There is no overfitting during the optimization process. Therefore, the optimization method and the optimized MPK model are reliable. The comparisons of the optimized model with Pieper model and Fenard model were performed by the reaction pathway analysis and sensitivity analysis for the predictions of the MPK profile, the low and high-temperature IDTs and the laminar flame speeds. Because of the difference in the molecular structure between MPK and 2-butanone, remaining the branching ratio among three MPK decompositions (R1–R3) and the ratio among the rate constants of the MPK hydrogen abstraction reactions by OH, H and CH 3 unchanged is unnecessary in the development of the MPK model using the analogy-based method, while the branching ratio of the hydrogen abstraction reactions at carbon 1, 3, and 5 remains unchanged. The competition among the decomposition and hydrogen abstraction reactions of MPK is intricate and crucial to the low and high-temperature oxidation . It is necessary to globally optimize the rate constants of R1-R16 based on the multidimensional experimental results, such as low and high-temperature IDTs, laminar flame speeds, and species profiles.
研究领域:
燃烧化学
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化学动力学
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能源工程
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反应机理建模
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优化算法
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DOI
高影响因子
Physical Review Applied
·
2022
·Vol. 17
·期 6
·064004
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IF 4.931
Xiaojun Mao,Min Qian,Xiaoyang Xuan,Yang Gao,Yueping Niu,Shangqing Gong
Although metal-organic frameworks attract much attention in electronic devices, the discontinuity at and weak interfacial contact with the substrate are still challenging. In this paper, an $\mathrm{Ag}$/(polyethylene glycol + zeolitic imidazole framework-8) @ (polyvinyl alcohol + 2-methylimidazole)/fluorine-doped tin oxide [$\mathrm{Ag}$/(PEG + ZIF8) @ (PVA + 2MIM)/FTO] structured resistive memory is fabricated. The interfacial contact and active site are enhanced by modifying FTO with (PVA + 2MIM). The continuity of ZIF-8 film is enhanced by compositing PEG. The resistive memory exhibits a lower set voltage of 1.3 V, a higher endurance of more than 140 cycles, and a longer retention time of over 10 000 s, in comparison with control devices of $\mathrm{Ag}$/ZIF-8/FTO and $\mathrm{Ag}/$ZIF-8 @ (PVA + 2MIM)/FTO. The mechanism of the resistive switching behavior is analyzed by conduction models, and explained by redox reactions of the top active electrode to form and rupture conductive filaments under the electric field. This study suggests a facial and general technology for synthesizing a continuous film with strong contact with the substrate, benefiting electronic devices.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Zhimin Zhao,Hanmeng Yuan,Junlei Wang,Jing Tian,Hongshuai Gao,Yi Nie
The adhesive hydrogel is beneficial for achieving secure adhesion to the skin, promising stable signal output when used as a wearable sensor. However, traditional adhesive hydrogels are isotropic, thus susceptible to contamination or detached by other substrates. This study proposed a “Release-Occupy” strategy for fabricating an integrally formed Janus adhesive hydrogel. Adhesion is facilitated by inhibiting polymer crystallization through the in-situ generation of nanoparticles using ionic liquid (IL) and metal ions, thereby releasing hydroxyl groups. Non-adhesiveness top surface is further achieved by occupying the released active hydroxyl groups with ethylene glycol (EG) through coating EG on the adhesive hydrogel top surface. The effects of different types of ILs and metal ions on the tensile strength, adhesiveness, and ionic conductivity of the hydrogel are systematically investigated. It is found that [Emim]DEP and Ca 2+ can achieve the highest adhesiveness. The addition of EG significantly reduced the adhesion force while imparting higher strength and electrical conductivity to the hydrogel. Besides, these hydrogels show excellent anti-freezing, cytocompatibility and antibacterial properties. Furthermore, the integrally formed Janus hydrogel with adhesive bottom surface and non-adhesive top surface can adhere stably to the skin and resistant to contaminants, allowing for stable monitoring of human activities and information transmission without the need for a top protective film. This study opens a new avenue for designing stable and adhesive conductive hydrogels, offering valuable guidance for the development of wearable sensors.
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DOI
高影响因子
Journal of Food Measurement and Characterization
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2023
·Vol. 17
·期 4
·3918-3926
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IF 3.4
Xu Lingfeng,Zou Ying,Wu Kui,Han Runlin,Huang Yanrong,Yi Xiuguang
Effective and non-invasive inspection method toward viscosity is expected to ease the burden of continued increased health problems worldwide. Herein, we proposed that viscosity is one of the most important markers in the liquid microenvironment. Then, a natural product was further developed from resveratrol derivate, polydatin, as an activatable molecular sensor for monitoring liquid micro-environmental viscosity alterations for metamorphic extent determination. This natural molecular sensor was constructed by the single double bond alternating conjugate structure, which can rotate freely in the low viscosity media, and in the highly viscous media, bright fluorescent signals are specifically activated (around 383 nm, 53-fold), endowing the natural sensor with the capacity to avoid autofluorescence from the additives and achieving high signal-to-noise ratio imaging. With the lower detection limit 1.125 cP, the sensor polydatin exhibits higher viscosity sensitive coefficient (0.60), and 75.5 nm of Stokes shift was found in the distilled water. Afterward, polydatin achieved non-invasively identifying the thickening effects of food thickeners. In addition, the capability of polydatin to evaluate the deterioration extent of liquids with viscosity as a robust marker was explored. It was found that the viscosity level in microenvironments is highly dependent on the liquid food metamorphic period. The fluorescent intensity increment and viscosity value changes were fitted into a linear equation. We expected that this approach would reinvigorate the fluorescent analytical methods toward liquid safety inspection.
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DOI
高影响因子
METABOLIC ENGINEERING
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2023
·
IF 8.4
Peichao Zhang,Jing Gao,Haiyang Zhang,Yongzhen Wang,Zhen Liu,Sang Yup Lee,Xiangzhao Mao
Zosteric acid (ZA) is a Zostera species-derived, sulfated phenolic acid compound with antifouling activity and has gained much attention due to its nontoxic and biodegradable characteristics. However, the yield of Zostera species available for ZA extraction is limited by natural factors, such as season, latitude, light, and temperature. Here we report the development of metabolically engineered Escherichia coli strains capable of producing ZA from glucose and glycerol. First, intracellular availability of the sulfur donor 3′-phosphoadenosine-5′-phosphosulfate (PAPS) was enhanced by knocking out the cysH gene responsible for PAPS consumption and overexpressing the genes required for PAPS biosynthesis . Co-overexpression of the genes encoding tyrosine ammonia-lyase, sulfotransferase 1A1, ATP sulfurylase, and adenosine 5′-phosphosulfate kinase constructed ZA producing strain with enhanced PAPS supply. Second, the feedback-resistant forms of aroG and tyrA genes (encoding 3-deoxy- d -arabinoheptulosonate 7-phosphate synthase and chorismate mutase , respectively) were overexpressed to relieve the feedback regulation of L- tyrosine biosynthesis. Third, the pykA gene involved in phosphoenolpyruvate-consuming reaction, the regulator gene tyrR , the competing pathway gene pheA , and the ptsHIcrr genes essential for the PEP:carbohydrate phosphotransferase system were deleted. Moreover, all genes involved in the shikimate pathway and the talA , tktA , and tktB genes in the pentose phosphate pathway were examined for ZA production. The PTS-independent glucose uptake system, the expression vector system, and the carbon source were also optimized. As a result, the best-performing strain successfully produced 1.52 g L −1 ZA and 1.30 g L −1 p -hydroxycinnamic acid from glucose and glycerol in a 700 mL fed-batch bioreactor .
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DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·457
·
IF 3.9
Tasie Ebenezer Onyedika,Mengying Xu,Yichao Deng,Yang Liu,Lian Li,Pier-Luc Tremblay,Tian Zhang
Adsorption is a low-energy, economical, and efficient method for pollutant removal from water. Because of their unique structure, large specific surface area (SSA), and non-toxicity, bismuth-based semiconductors, usually researched for the photodegradation of organic molecules, are also excellent for dark adsorption processes. Here, a three-dimensional adsorbent with a heterostructure with a hydrangea-like shape made of Bi2MoO6(BMO) and BiOI (BOI) was synthesized by a one-pot solvothermal process and investigated for the adsorption of toxic dyes. BOI/BMO with an I-to-Mo ratio of 2.0 adsorbed 98.9% of the model pollutant rhodamine B (RhB) within 5 min with a maximum adsorption capacity of 72.72 mg/g in the dark at room temperature. When compared to pure BMO, the BOI2/BMO heterostructure was 14.1 times more performant because of its flower-like morphology with multiple planes, an SSA that was 1.6-fold larger, increased porosity, the formation of heterojunctions, and a negative surface charge attracting RhB. Further investigation indicated that adsorption by BOI2/BMO fitted the pseudo-second-order kinetic and the Langmuir isotherm models. In addition, the thermodynamic analysis showed that it was a spontaneous exothermic process probably relying on physisorption. Thus, the BOI/BMO adsorbent developed here is promising for the fast removal of toxic dyes from industrial wastewater.Keywords:BiOI/Bi2MoO6;heterostructure;rhodamine B;dark adsorption;kinetics;thermodynamic
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NEUROBIOLOGY OF DISEASE
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2023
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IF 6.1
Qiaoying Huang,Congmin Chen,Weizhao Chen,Chaoyu Cai,Hailin Xing,Junyu Li,Mingtao Li,Shanshan Ma
Parkinson's disease (PD) is the most common neurodegenerative movement disorder, characterized by the progressive loss of nigrostriatal dopaminergic neurons (DANs), involving the dysregulation of both neurons and glial cells. Cell type- and region-specific gene expression profiles can provide an effective source for revealing the mechanisms of PD. In this study, we adopted the RiboTag approach to obtain cell type (DAN, microglia, astrocytes)- and brain region (substantia nigra, caudate-putamen)-specific translatomes at an early stage in an MPTP-induced mouse model of PD. Through DAN-specific translatome analysis, the glycosphingolipid biosynthetic process was identified as a significantly downregulated pathway in the MPTP-treated mice. ST8Sia6, a key downregulated gene related to glycosphingolipid biosynthesis, was confirmed to be downregulated in nigral DANs from postmortem brains of patients with PD. Specific expression of ST8Sia6 in DANs exerts anti-inflammatory and neuroprotective effects in MPTP-treated mice. Through cell type (microglia vs. astrocyte) and brain region (substantia nigra vs. caudate-putamen) comparisons, nigral microglia showed the most intense immune responses. Microglia and astrocytes in the substantia nigra showed similar levels of activation in interferon-related pathways and interferon gamma (IFNG) was identified as the top upstream regulator in both cell types. This work highlights that the glycosphingolipid metabolism pathway in the DAN is involved in neuroinflammation and neurodegeneration in an MPTP mouse model of PD and provides a new data source for elucidating the pathogenesis of PD.
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xing Wang,Xuesen Du,Kunlu Chen,Ziwen Zheng,Yanggu Liu,Xiaoqiang Shen,Chenlong Hu
Ammonia synthesis in a plasma catalysis system coupling dielectric barrier discharge and an alumina-loaded ruthenium catalyst was investigated. The discharge energy, the N2 to H2 ratio, and the reactant flow rate greatly affect the production of NH3 and the efficiency of energy. Higher ammonia synthesis rates and higher energy yields were obtained at high discharge powers and flow rates. An artificial neural network (ANN) was built to describe the influence of operating parameters on the NH3 synthesis performance, including ammonia synthesis rate and energy yield. The proposed ANN model was trained using experimental data. The results showed the N2 to H2 ratio was the most impactful parameter with a relative importance of 41.7% on the model, followed by the flow rate and discharge power of 32 and 26.3%, respectively. This ANN model can effectively help to optimize the operating parameters of the plasma catalysis system for NH3 synthesis and predict the catalysis performance under specific situations.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Shen Yu,Ming-Hui Sun,Yuan-Yuan Wang,Zhan Liu,Jia-Min Lyu,Yi-Long Wang,Zhi-Yi Hu,Yu Li,Li-Hua Chen,Bao-Lian Su
The epoxidation reaction over titanium silicalite-1 (TS-1) zeolites is a green way to produce epoxides that are important intermediates for chemicals. Nevertheless, the conventional microporous TS-1 zeolite shows limited diffusion ability for bulky molecules, leading to poor activity and low selectivity. Constructing hierarchical porosity in microporous materials is an effective strategy to enhance the diffusion properties of catalysts. However, there are few reports on the design and synthesis of TS-1 zeolites with hierarchical structure featuring multilevels, interconnectivity, and regularity for efficient diffusion and epoxidations. Herein, hierarchical TS-1 zeolites with ordered macro–meso–microporosity (OMMM-TS-1) are obtained by a method combining a templated effect of ordered macro–mesoporous matrices and a confined in situ crystallization process. The OMMM-TS-1 possesses ordered macropores with tunable size (∼200–600 nm), ordered mesopores (∼8 nm), and intact micropores (∼0.5 nm). The OMMM-TS-1 achieves a cyclooctene conversion as 3.6 times and 1.8 times and a selectivity to epoxy product as 1.6 times and 1.3 times higher than the conventional TS-1 (C-TS-1) and nanosized TS-1 (Nano-TS-1) zeolites, respectively. The OMMM-TS-1 also outperforms the C-TS-1 and Nano-TS-1 zeolites in epoxidations of a series of alkenes. Such a novel hierarchical structure can be applied in the design and synthesis of many other catalysts.
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高影响因子
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