JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·050541
·
IF 3.1
Ye-ba Yan,Yue Fang,Jia-liang Wang,Heng-xue Zhou,Yi Long,Bo Liang,Ying-bang Yao,Libin Tian,Sheng-guo Lu,Tao Tao
Due to a lack of portable flexible power supply, flexible electronic products can still not be applied in a large scale, particularly in the high energy density devices. To resolve this issue, flexible solid-state lithium batteries with a high safety, excellent mechanical property, and high energy densit，is proposed. In this paper, a flexible solid-state lithium-manganese battery is developed, which is assembled with a lithium cloth composite anode, a composite solid-state electrolyte poly (vinylidene fluoride)-hexafluoropropylene (PVDF-HFP)/Li6.4La3Zr1.4Ta0.6O12 (LLZTO), and a composite cathode (Fe ion-doped MnO2-carbon cloth). To improve the conductivity and stability of cathode, a mixture of conductive carbon black (Super P) and sodium alginate (SA) is employed. To ensure the high capacity and low price, the MnO2-based cathode is used.The obtained solid state batteries can deliver an initial capacity of 275.9 mAh g−1 at a current density of 1 C and a capacity retention of 57.9% (159.7 mAh g−1) after 1000 cycles. Also the produced flexible punch cell can light up the light-emitting diode(LED), and its capacity is 0.58 mAh cm−2 after 100 cycles at current density of 0.2 C.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·077514
·
IF 3.1
Tengteng Zhao,Chaoyu Wang,Lei Dai,Weiwei Meng,Yongguang Liu,Yuehua Li,Ling Wang
NO2 is an important pollutant of automobile engines and industrial fuels, making it important to quantitatively monitor and control. An amperometric-type NO2 gas sensor was fabricated using yttria-stabilized zirconia (YSZ) electrolyte with a bi-layered structure and La0.7Sr0.3MnO3−δ-xNiO (LSMO-xNiO, x = 0–0.75) composite sensing electrode (SE) prepared by impregnation method in combination with self-demixing. The samples were characterized using SEM, XRD, and XPS, and their performance as sensors was tested. LSMO-xNiO composite SE particles were formed by de-mixing in the process of treating the precursor at high temperatures and are uniformly dispersed in the YSZ porous backbone. With the increase of NiO content, the SE particles become significantly large. At 450 °C–600 °C, the response currents at a fixed potential have a linear relationship with the NO2 concentrations at 25–700 ppm. Combining stability and sensitivity, the voltage was fixed to −0.25 V. The introduction of NiO into the LSMO sensing electrode effectively improves the performance of the sensor. The sensor based on LSMO-0.5NiO has the highest sensitivity (0.0405 μA/ppm) at 550 °C. Simultaneously, the sensor exhibits good anti-interference ability for CH4, CO2, O2, and NO, but has obvious cross-sensitivity to H2 and NH3. In addition, the response current of the sensor change with the increase of RH.
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高影响因子
International Journal of Applied Ceramic Technology
·
2021
·Vol. 18
·期 4
·1183-1191
·
IF 1.968
Sen Wang,Feng Liang,Saisai Li,Liang Tian,Shaowei Zhang,Quanli Jia,Shuai Chang,Sheng Yan,Haijun Zhang
Monophase α-Si 3 N 4 was prepared by a salt melt strategy using Si as a starting material. The results showed that molten salt enhanced the conversion of Si to monophase α-Si 3 N 4 , and some as-synthesized α-Si 3 N 4 nanoparticles had a hexagonal platelet morphology. The α-Si 3 N 4 hexagonal nanoplatelets had an average lateral dimension of about 170 nm and a thickness of about 5.2 nm. The nitridation of Si in molten salt was investigated by a thermal quenching method, and the silicon halide intermediate products were detected by X-ray photoelectron spectroscopy. Silicon halides possessing higher reactive activity facilitated the nitridation of Si and nucleation of α-Si 3 N 4 . Furthermore, the lattice mismatch between α-Si 3 N 4 and the salts was calculated, suggesting that the lateral growth of α-Si 3 N 4 nanoplatelets had been guided by the salt crystal structure. Based on the results, the relevant formation mechanism of α-Si 3 N 4 nanoplatelets was proposed.
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CRYSTAL GROWTH & DESIGN
·
2022
·
IF 4.01
Xiao Ou,Shuting Li,Yunyun Chen,Haowei Rong,Ao Li,Ming Lu
Griseofulvin (GSF) is a clinically used antifungal drug that was reported to have three true polymorphs (Forms I–III) over the past eight decades. Here, we present the discovery of two new polymorphs (denoted Forms IV and V) that are accessible only in the presence of polyethylene glycol (PEG). The crystal structures of Forms IV and V were determined by X-ray crystallography using single crystals cultivated by melt crystallization. The identification and crystallization behavior of Forms IV and V were fully investigated. A solid-form landscape of melt-crystallized GSF in the presence of PEG was established to describe the complicated phase conversions among six solid forms, including five true polymorphs and a previously known GSF-PEG inclusion complex. The influence of the molecular weight and content of PEG on the polymorphism of GSF was studied. This work suggests that PEG addition is an alternative strategy that cannot be neglected in polymorphism screening. The results also expand our understanding of the complicated crystallization behavior of GSF in dispersions with PEG and highlight the importance of polymorphism control during the manufacture and storage of PEG-based solid dispersions to achieve reproducible and consistent pharmaceutical performance.
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高影响因子
Biotechnology for Biofuels and Bioproducts
·
2024
·Vol. 17
·期 1
·1-10
·
IF 3.3
Wang Lijuan,Deng Yongdong,Gao Jianjie,Wang Bo,Han Hongjuan,Li Zhenjun,Zhang Wenhui,Wang Yu,Fu Xiaoyan,Peng Rihe,Yao Quanhong,Tian Yongsheng,Xu Jing
Background The demand for melatonin is increasing due to its health-promoting bioactivities such as antioxidant and sleep benefits. Although melatonin is present in various organisms, its low content and high extraction cost make it unsustainable. Biosynthesis is a promising alternative method for melatonin production. However, the ectopic production of melatonin in microorganisms is very difficult due to the low or insoluble expression of melatonin synthesis genes. Hence, we aim to explore the biosynthesis of melatonin using Escherichia coli as a cell factory and ways to simultaneously coordinated express genes from different melatonin synthesis pathways. Results In this study, the mXcP4H gene from Xanthomonas campestris , as well as the HsAADC , HsAANAT and HIOMT genes from human melatonin synthesis pathway were optimized and introduced into E. coli via a multi-monocistronic vector. The obtained strain BL7992 successfully synthesized 1.13 mg/L melatonin by utilizing L-tryptophan ( l -Trp) as a substrate in a shake flask. It was determined that the rate-limiting enzyme for melatonin synthesis is the arylalkylamine N-acetyltransferase, which is encoded by the HsAANAT gene. Targeted metabolomics analysis of l -Trp revealed that the majority of l -Trp flowed to the indole pathway in BL7992, and knockout of the tnaA gene may be beneficial for increasing melatonin production. Conclusions A metabolic engineering approach was adopted and melatonin was successfully synthesized from low-cost l -Trp in E. coli . This study provides a rapid and economical strategy for the synthesis of melatonin.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Sathish Reddy,Ran Du,Lixing Kang,Nannan Mao,Jin Zhang
Preparation of electrocatalysts with high activity and low cost are essential for mass production of hydrogen. However, preparation of such catalyst are still highly challenging thus far. In this paper, we focus on preparation of a three- dimensional CNTs aerogel/MoS x catalyst by using solvothermal process. The MoS x material has been successfully combined with three- dimensional CNTs aerogel and creates a sufficient active site exposure as well as 3D conductive networks for fast charge transport. Due to this the catalyst exhibited high activity for HER with a small onset over potential of ∼150 mV, a Tafel slope of 62 mV dec −1 , and an exchange current density of 6.4 mA cm −2 . The catalysts also show excellent stability during long-term 1000 cycles and electrolysis confirm the durability of the catalyst. The enhanced performance is attributed to synergistic effects of CNTs aerogel and MoSx, which enhance the activities for both components for HER.
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高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 11
·2201967
·
IF 6.8
Jiping Zhao,Youlong Xu,Wenqiang Hou,Yizhuo Li,Xiangdong Ding
Although embedded capacitors have been applied and researched for many years, their large-scale application still faces challenges such as low capacitance density, high thickness, high cost, and incompatibility with integrated processes. In this work, a breakthrough has been made in the fabrication of ultra-thin tantalum (Ta) capacitors with ultra-high capacitance density that can be used for 3D packaging. The key to these excellent performances is the application of Ta foil with nano-porous structure to the anode of the capacitor. The Ta foil with high specific surface area (SSA) is successfully prepared by direct current pulse etching. At a current density of 15 mA cm −2 , a pulse frequency of 50 Hz, and a duty cycle of 30%, the SSA of Ta foil is increased by 76 times after etching in an electrolyte with 0.01 v% TOA for 30 min. Based on this, Ta capacitors with a form factor of less than 40 µm, showing a capacitance density of 750 nF mm −2 and a leakage current of less than 2.1 × 10 −7 A at 8 V is successfully fabricated. To the best of the authors’ knowledge, this is the highest capacitance density reported to date for the mentioned form factors.
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Nano Energy
·
2020
·
IF 16.602
Xiang Chu,Xun Zhao,Yihao Zhou,Yihan Wang,Xueling Han,Yilin Zhou,Jingxin Ma,Zixing Wang,Haichao Huang,Zhong Xu,Cheng Yan,Haitao Zhang,Weiqing Yang,Jun Chen
Developing lightweight, flexible, and foldable electrodes with decent mechanical durability and electrochemical activity is a highly desirable goal for solid-state electrochemical energy storage devices yet remains a formidable challenge to overcome. Herein, we invent a freestanding robust PANI membrane via introducing the dynamic boronate bond to bridge rigid PANI chains with complaint polyvinyl alcohol (PVA) chains. The resultant PANI/PVA membrane (PPM) exhibits remarkable elasticity (17.8% strain) along with excellent tensile strength (33.7 MPa), outperforming the majority of existing state-of-the-art flexible electrochemical PANI membranes. Additionally, the PPM can be further assembled into a wearable solid-state supercapacitor with high electrochemical performance as well as decent mechanical durability. The lightweight, flexible, and foldable PANI membrane represents a great advancement in electrode materials for next-generation wearable solid-state electrochemical energy storage devices.
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高影响因子
COMBUSTION AND FLAME
·
2021
·
IF 4.185
Zujun Zheng,Yiwei Li,Lei Shi,Dongdong Chen,Changhua Zhang,Jingbo Wang,Ping Li
Indene is an important intermediate in the ring growth process of polycyclic aromatic hydrocarbons (PAHs) which are soot precursors in the fuel combustion . Ignition delay times of indene/3.3% O 2 /Ar and indene/air mixtures were measured behind reflected shock waves over temperatures of 1098–1618 K, pressures of 2.5–10.0 atm, and equivalence ratios of 0.5, 1.0 and 2.0. An Arrhenius-type formula can describe all the measured indene/3.3% O 2 /Ar ignition delay data. But three Arrhenius-type formulas were used to describe the measured indene/air ignition delay data for three pressures because the activation energy varies with different ignition pressures. Indene ignition characteristics in different dilution conditions were compared and discussed. Current results show that the indene ignition delay follows τ ∝ Φ + n diluted in Ar with fuel-lean mixture igniting the fastest and τ ∝ Φ −n at real fuel-air condition with fuel-rich mixture igniting the fastest. For indene/air, when the pressure increases, the effect of equivalence ratio on ignition becomes stronger and the sensitivity of ignition to the variation of temperature becomes weaker. Furthermore, an indene combustion mechanism was developed. The predictions of the developed mechanism are in good agreement with the measured data. Reaction pathway and sensitivity analyses were carried out to determine reaction pathways during the ignition process and dominate reactions which affect ignition delay times. Current experimental results are useful for understanding the ignition properties of indene and studying the formations of larger PAHs and soot. To our knowledge, experimental ignition delay times and a detailed combustion mechanism for indene are firstly reported in this work.
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Research
·
2021
·
IF 0
Qianying Lu,Yunlei Zhou,Xiangfei Yin,Shitai Cao,Xiaoliang Wang,Desheng Kong
In contrast to ionically conductive liquids and gels, a new type of yield-stress fluid featuring reversible transitions between solid and liquid states is introduced in this study as a printable, ultrastretchable, and transparent conductor. The fluid is formulated by dispersing silica nanoparticles into the concentrated aqueous electrolyte. The as-printed features show solid-state appearances to allow facile encapsulation with elastomers. The transition into liquid-like behavior upon tensile deformations is the enabler for ultrahigh stretchability up to the fracture strain of the elastomer. Successful integrations of yield-stress fluid electrodes in highly stretchable strain sensors and light-emitting devices illustrate the practical suitability. The yield-stress fluid represents an attractive building block for stretchable electronic devices and systems in terms of giant deformability, high ionic conductivity, excellent optical transmittance, and compatibility with various elastomers.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 8
·H459
·
IF 2.588
Jing Zhang,Huihui Zhu,Meiling Wang,Wenchang Wang,Zhidong Chen
A novel and sensitive electrochemical method was proposed for the determination of Sunset yellow (SY) using an expanded graphite paste electrode (EGPE). The EGPE was prepared by mixing expanded graphite (EG) with solid paraffin. EG was characterized with scanning electron microscopy. Compared with flake graphite paste and carbon paste electrode, the EGPE showed a higher electrocatalytic activity toward the oxidation of SY. The EGPE exhibited wide linear response of 5.0 × 10−8−2.0 × 10−6 mol/L with a detection limit down to 5.0 nmol/L (S/N = 3) and good accuracy, precision, reproducibility. The proposed method was successfully applied in the determination of SY in jelly and fruit juice.
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DRUG METABOLISM AND DISPOSITION
·
2014
·Vol. 42
·期 5
·839-843
·
IF 3.334
Ke Li,Sylvia Zhao,Lingling Zhang,Xiaoyun Wu,Pan Shu,Yang Wang,Hao Feng,Zheming Gu,Helen Han Hsu
It has been proposed that in humans 4β-hydroxycholesterol is formed mainly by CYP3A-catalyzed metabolism of cholesterol and thus may serve as an endogenous marker for CYP3A activity. The cynomolgus monkey is widely used as one of the nonrodent preclinical safety species in pharmaceutical research. In the current study, the potential application of 4β-hydroxycholesterol as an endogenous biomarker of CYP3A in response to drug treatment was evaluated in cynomolgus monkeys. Following multiple oral administration of rifampicin (a known CYP3A inducer) at 15 mg/kg/d in cynomolgus monkeys, the mean serum 4β-hydroxycholesterol levels increased 4-fold from the baseline of 55.3 ± 21.7 to 221 ± 53.4 ng/ml. The mean concentration ratios of 4β-hydroxycholesterol to cholesterol increased 5-fold. The data suggest that 4β-hydroxycholesterol formation from cholesterol metabolism was induced by rifampicin treatment in monkeys. This observation correlated with the metabolism of midazolam (a probe substrate of CYP3A activity) monitored in the same study. The serum exposure (area under the curve) of midazolam was markedly decreased by ∼95%, confirming the induction of CYP3A catalytic activity by rifampicin treatment in monkeys. The formation of 4β-hydroxycholesterol from cholesterol was specifically mediated by recombinant cynomolgus CYP3A8 and CYP3A5. The Km values of CYP3A8 and CYP3A5 for 4β-hydroxycholesterol formation from cholesterol were 204 and 104 μM, respectively, and Vmax values were 0.600 and 0.310 pg/pmol/min, respectively. The results suggest that 4β-hydroxycholesterol can be used as an endogenous biomarker to identify strong CYP3A inducers in cynomolgus monkeys, which may help to evaluate drug-drug interaction potential of drug candidates in preclinical settings.
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PubMed
高影响因子
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