Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Liu Wei,Li Jinxing,Li Wenting,Xu Hanying,Zhang Chao,Qiu Xinping
The low Coulombic efficiency during cycling hinders the application of Cobalt-free lithium-rich materials in lithium-ion batteries. Here we demonstrated that the dissolution of iron, rather than traditionally acknowledged manganese, is mainly responsible for the low Coulombic efficiency of the iron-substituted cobalt-free lithium-rich material. Besides, we presented an approach to inhibit the dissolution of transition metal ions by using concentrated electrolytes. We found that the cathode electrolyte interphase (CEI) layer formed in the concentrated electrolyte is a uniform and robust LiF-rich CEI, which is a sharp contrast with the uneven and fragile organic-rich CEI formed in the dilute electrolyte. The LiF-rich CEI not only effectively inhibits the dissolution of TMs but also stabilizes the cathode structure. The Coulombic efficiency, cycling stability, rate performance, and safety of the Fe-substituted cobalt-free lithium-rich cathode material in the concentrated electrolyte have been improved tremendously.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 10
·2200054
·
IF 1.599
Xinjun Wang,Bian Li,Fang Xu,Dapeng Wu,Yuqin Jiang,Wei Li,Kai Jiang
The composite photocatalyst composed of WO 3 and Bi 2 WO 6 can play the synergistic effect between the two individual components. Herein, a WO 3 /Bi 2 WO 6 heterogeneous material with high quality interface has been synthesized via situ growing Bi 2 WO 6 directly on the surface of WO 3 nanoplates. The photocatalytic degradation efficiency of tetracycline (TC) for BWO-3 reaches ≈92%, which is much higher than that of WO 3 (≈27%) due to the coupling effect of WO 3 and Bi 2 WO 6 . Electrochemical impedance and photocurrent measurements prove that WO 3 /Bi 2 WO 6 heterogeneous material has decreased carriers’ transfer resistance and higher photocurrent density, which endows its improved photocatalytic performance. Also, the radical trapping experiment proves that superoxide radical has great impacts on the degradation of TC. This work provides an efficient method for developing photocatalysts with excellent performance.
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Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 9
·4694-4703
·
IF 5.503
Zhewen Ma,Qiuyu Zhang,Subrata Panda,Wen Zhu,Fengzhan Sun,Darvaish Khan,Jinjian Dong,Wenjiang Ding,Jianxin Zou
Nano-confinement (NC) of Mg/MgH2 in suitable host materials is a promising strategy for simultaneously tuning the thermodynamics and kinetics of Mg-based hydride materials. In the present study, the fabrication of multifunctional host materials for NC of MgH2 was firstly attempted with the aim of improving the hydrogen sorption properties of MgH2. The NC of MgH2 in the mesoporous structure of a Ni-based metal–organic-framework (denoted as MgH2@Ni-MOF) was successfully conducted via a combination of solvothermal method and wet impregnation method followed by hydrogenation at relatively lower temperatures. Structural inspections through X-ray diffraction and high resolution transmission electron microscopy demonstrate the in situ formation of Mg2NiH4 around the MgH2 nanocrystals (∼3 nm), due to the reaction between Ni ions from the Ni-MOF and Mg ions from the dibutyl-magnesium (MgBu2) precursor in a hydrogen atmosphere. Hydrogen sorption tests reveal that the thermodynamics (−65.7 ± 2.1 and 69.7 ± 2.7 kJ mol−1 H2 for ab-/desorption, respectively) and kinetics (41.5 ± 3.7 and 144.7 ± 7.8 kJ mol−1 H2 for ab-/desorption, respectively) of Mg/MgH2 in the MgH2@Ni-MOF composite have been significantly improved. Meanwhile, the Ni-MOF scaffold acts as an “aggregation blocker” to impede the growth and agglomeration of Mg/MgH2 nanocrystals during hydriding/dehydriding cycles, leading to outstanding hydrogen cycling stability. The improvement in thermodynamics and kinetics of MgH2@Ni-MOF has been attributed to the synergistic “nanosize effect” of nanoconfined Mg/MgH2 and catalytic effects from in situ formed Mg2Ni/Mg2NiH4.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Luna Tie,Yanmei Liu,Shujie Shen,Chongfei Yu,Cuijiao Mao,Jingyu Sun,Jianhui Sun
Exploring high-efficiency photocatalysts for hydrogen generation from water splitting has recently spurred enormous scientific interest. Herein, the formation of Pt/GO-ZnS photocatalysts via a step-wise strategy and the mechanism of improved hydrogen production efficiency are systematically studied. Thus-prepared optimal Pt/GO-ZnS composite (with the ratio of Pt and GO are 1 and 2 wt%, respectively) exhibits excellent photocatalytic hydrogen production performance of 1082 μmol h −1 g −1 under simulated sunlight irradiation, which stays 2.8 and 2.6 times higher than that of ZnS/GO (2 wt%) and ZnS/Pt (1 wt%), respectively. Exhaustive experimental studies reveal that the outstanding activity of Pt/GO-ZnS is attributed to the efficient interfacial charge transfer and enhanced visible light harvesting caused by the synergetic effects of GO and Pt. In further contexts, the photocatalytic mechanism is explored: Photo-generated electrons in the conduction band of ZnS can be immediately trapped through GO and rapidly transferred onto Pt nanoparticles thanks to the tight interface. This study represents an effective and facile strategy to rationally design advanced photocatalytic system in solar energy conversion .
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Lu Zhang,Guojun Yuan,Xinyu Wang,Jianliang Bai,Yaqing Zhu,Lili Ren
Environmental pressure gives potential for the application of transition metal phosphides (TMPs), which serve as efficient degradation catalysts. Although various efforts are advocated to obtain high activity, it is still difficult for phosphides to exhibit cycle performance in hydrodechlorination (HDC), limiting their practical development. By linking the changes in the oxidation state of MoP before and after HDC with its catalytic performance, the Mo–P–O bond is found to be the active catalytic site, not only promoting electron transfer but also forming the defect-rich structure. Based on this, H2O2-treated MoP after HDC reached a performance of 19.9%, and the activity could be restored after multiple cycle reactions, while the untreated one still had poor performance, demonstrating that carrying out the H2O2 treatment process can realize the recycling of MoP, which is of importance for industrial application of catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Gao,Yuanyuan Zhao,Yijie Chang,Kuidong Gao,Qiurui Wang,Qiang Zhang,Qunwei Tang
The presence of defects and residual tensile strain in perovskites has a significant and deleterious impact on the efficiency and stability of all-inorganic perovskite solar cells (PSCs). Here, dimethyl sulfoxide (DMSO) with strong polarity and high boiling point is introduced into the PbBr 2 precursor to delay the crystallization of PbBr 2 , leading to the formation of high-quality PbBr 2 films by delaying the solution reaching supersaturation. The formation of PbBr 2 (DMSO) adduct facilitates the complete reaction of PbBr 2 with CsBr via intramolecular exchange, thus preventing the formation of impurity phases such as CsPb 2 Br 5 . As a result, the defect density of CsPbBr 3 films decreased by 33% due to the improved phase purity, thicker films, larger grain sizes, and reduced grain boundaries. The small porosity of PbBr 2 film combined with a more complete phase-conversion process results in an expanded perovskite film that experiences compressive strain, effectively compensating for the tensile strain generated during annealing and thereby achieving the goal of strain relaxation. The optimized DMSO-based device, which exhibits compressive strain and minimal defects, achieves a remarkable efficiency of 10.11% with an open-circuit voltage of up to 1.611 V. Additionally, the unencapsulated PSC demonstrates excellent stability under 80% relative humidity and 80 °C over 30 days.
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Nanoscale
·
2020
·Vol. 12
·期 11
·6522-6528
·
IF 6.895
Xuefeng Zhang,Long Gao,Min Zhao,Yanqin Miao,Zhiyuan Wang,Chengqiang Wang,Peizhi Liu,Bingshe Xu,Junjie Guo
Cesium lead halide perovskite nanocrystals (PNCs) have aroused tremendous research attention because of their excellent optoelectronic properties. Herein, we developed a facile and green low-temperature strategy free of organic solvents, in which only pure water was adopted as the solvent, to synthesize CsPbBr3 NCs. Intriguingly, although formed with the assistance of water, the obtained CsPbBr3 NCs present a cubic crystal structure, photoluminescence quantum yield (PLQY) of 75%, and narrow emission line width for bright green emission. Furthermore, both electroluminescence (EL) and photoluminescence (PL)-based light-emitting diodes (LEDs) present intrinsic green emission originating from the as-prepared CsPbBr3 NCs. Hence, this work offered a novel eco-friendly avenue for the preparation of perovskite NCs for their practical applications in LEDs.
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Journal of Energy Chemistry
·
2018
·
IF 3.886
Na Li,Yaoda Xin,Haosen Chen,Shuqiang Jiao,Hanqing Jiang,Wei-Li Song,Daining Fang
Graphite has been currently considered as a promising cathode material in dual ion batteries (DIBs) due to its unique features of sp 2 hybridized carbon and stacked two-dimensional layered structures. However, unexpected volume/thickness changes in the graphite cathodes, induced by the intercalation/deintercalation of anions with large molecular size have been known to be a critical problem in designing DIB cells. To understand the volume/thickness changes in the DIB electrodes, in operando optical observing apparatus has been employed to observe the cross-section view of a graphite-based cathode upon cycles in the present work. The observation suggests that the cathode initially presented a huge irreversible thickness change (60%), and such thickness variation was prone to reduce and remain <20% in the following cycles. The results from both in operando observation and electrochemical characterizations collectively indicate that the greater thickness variation at initial cycle should be attributed to both anion intercalation into graphite-based cathodes and irreversible decomposition of chemical components in the DIB system. The method here highlights a universal route for fundamentally understanding the electrodes of huge volume variation.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 2
·e20155
·
IF 3.5
Xing Zhao,Minghui He,Xinyu Zeng,Qin Li,Guanghua Wu,Fukang Chen,Shaofei Zhang,Jinfeng Sun,Alexander N. Vtyurin,Yan Yan,Haibo Zhang,Gang Liu
Despite being the key component in modern electronic devices or power systems, ceramic dielectric capacitors have drawbacks like low energy storage density and efficiency that limit their extensively wide application. This work adopted a different route to improve energy storage performance compared with the frequently utilized composition modification. 0.98Ba 0.65 Sr 0.245 Bi 0.07 TiO 3 -0.02Ce Pb-free ceramics with different polyvinyl alcohol (PVA) contents were prepared through viscous polymer processing. The rheological and energy-storing performance were systematically studied. It can be seen that high PVA content results in more pores and larger grain sizes that will deteriorate the breakdown strength of ceramics. The highest breakdown strength reached 420 kV/cm while the concentration of PVA was 5 wt%. The mechanism of grain sizes on breakdown strength is studied by electrical tree simulation based on COMSOL. Viscous polymer processing with proper PVA content is very effective in generating dense and homogenous structures. Finally, the ceramic with 5 wt% PVA possesses a high density of up to 4.41 J/cm 3 and an efficiency of about 84.21% at 420 kV/cm. Simultaneously, this ceramic improved stability of both temperature (30–150°C) and frequency (1–300 Hz) at 350 kV/cm, while the η kept above 90% and W rec exceeding 3.6 J/cm 3 .
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JOURNAL OF ETHNOPHARMACOLOGY
·
2025
·
IF 5.4
Jingming Niu,Yuanquan Ran,Qiong Hu,Nian Yang,Lanlan Yang,Huan Zhao,Bing Yang,Dongxin Tang,Minyi Tian
Ethnopharmacological relevance Eomecon chionantha , a traditional Chinese medicine, is a perennial herb widely cultivated for its medical properties and has been used to treat cancer. However, there are few studies on its anticancer properties. Aim of the study This work aimed to identify the chemical composition of E . chionantha root and firstly assess its anti-lung cancer effects in vitro and in vivo . Materials and methods E. chionantha root was extracted by reflux using different solvents in sequence to prepare petroleum ether extract (PEE), ethyl acetate extract (EAE), n-butanol extract (NBE), and water extract (WE). Phytoconstituent analysis of E. chionantha root WE was performed by UHPLC-Q-Orbitrap-MS. In in vitro assays, cytotoxicity of four samples from E. chionantha root on non-cancerous MRC-5 cell line and A549 lung cancer cell line was done by MTT. The impact of E. chionantha root WE on A549 cell proliferation was tested by colony formation assay, and flow cytometry with PI staining was utilized for evaluating its influence on the cell cycle. We performed morphological observations, AO/EB staining, Hoechst 33258 staining, and Annexin V-FITC/PI staining assays to investigate the capacity of E. chionantha root WE to induce A549 cell apoptosis. Wound healing and transwell invasion tests assessed its potential to inhibit A549 cell migratory and invasive abilities. Western blot was used to determine its effect on protein levels associated with proliferation, apoptosis, and metastasis in A549 cells. To further validate its in vivo anticancer efficiency, we established an A549 cell xenograft tumor nude mouse model, recorded tumor volume and weight, and conducted histopathological changes using H&E staining and TUNEL assay. Results Sixty-one constituents were identified from E . chionantha root WE. For in vitro anticancer properties, E . chionantha root WE displayed selective cytotoxicity against A549 cells (IC 50 = 5.39 ± 0.18 μg/mL) and lower toxicity to MRC-5 cells (IC 50 = 11.75 ± 1.10 μg/mL). E. chionantha root WE triggered G1 phase arrest via up-regulating p21 levels and down-regulating CDK4, CDK6, and cyclin D3 levels, which markedly suppressed A549 cell proliferation. It induced A549 cell apoptosis via a mitochondria-mediated pathway, leading to Bax up-regulation, ΔΨm down-regulation, Cyt C release, activation of caspase 9 and caspase 3, and PARP cleavage. In addition, it repressed the migratory and invasive abilities of A549 cells through lowering MMP-2 and N-cadherin levels. Regarding in vivo antitumor activity, E . chionantha root WE effectively inhibited A549 xenograft tumor growth and induced cell apoptosis in nude mice. Hence, E . chionantha root WE repressed A549 cell proliferation, induced apoptosis, and inhibited the migratory and invasive abilities in vitro and suppressed tumor growth by inducing apoptosis in vivo . Conclusions E. chionantha root WE exhibited pronounced anti-lung cancer efficiency in vivo and in vitro and can be considered a novel source of anticancer agents with great value for development in the pharmaceutical industry.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2025
·Vol. 26
·期 8
·3599
·
IF 4.9
Zhenkai Tong,Hao Zhou,Zhiwen Qi,Jianxin Jiang,Wenjun Li,Chengzhang Wang
The genusQuercusis widely distributed globally and serves as a potential source of phenolic compounds, which are renowned for their potent biological activities. The primary objective of this study was to determine the concentrations of metabolite components and evaluate the relative antioxidant activities of valonea (acorn cups) fromQuercus variabilis(Q. variabilis) of different geographic origins using a UPLC-ESI-MS/MS-based metabolomics approach. A total of 791 metabolite components were identified, with significant variations in their concentrations observed among samples from different geographic locations. Among these, 1-O-galloyl-β-D-glucose was identified as a key active compound. The biosynthesis of galloyl sugars, galactose metabolism, and pathways for starch and sucrose metabolism represent the three pathways that correspond to the differential metabolites, encompassing 23, 11, and 7 metabolites, respectively. The variations in the antioxidant effectiveness of valonea could mainly be linked to the synthesis of galloyl sugars. These findings improve our knowledge of the composition of valonea and offer valuable resources for its extensive utilization and focused development.
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PubMed
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Frontiers in Pharmacology
·
2021
·
IF 5.811
Li Jun,Liu Hao,Yang Zhenzhong,Yu Qingqing,Zhao Lu,Wang Yi
Thrombosis is a key pathological event in cardiovascular diseases, and is also the most important targeting process for their clinical management. New drug development in thrombosis treatment is still in great demand. According to the traditional Chinese medicine (TCM) theory, thrombosis belongs to the syndrome of blood stasis. Salvia miltiorrhiza Bunge and Ligusticum striatum DC. are two common TCM herbs with long-term documented function in promoting blood circulation and inhibiting thrombosis, especially when used together. Guanxinning Tablet, a modern Chinese drug which contains extracts of the two herbs, also showed strong therapeutic effects in coronary heart disease. However, the pharmacological mechanism is still lacking for the compatibility of the two herbs. Here, through zebrafish-based in vivo fluorescence screening, we demonstrated the synergistic effects between S. miltiorrhiza Bunge and L. striatum DC. in regulating endogenous thrombosis. Moreover, combined with high-resolution mass spectrometry, the main compounds of the botanical drugs were analyzed and screened in our model system. Interestingly, cryptotanshinone and senkyunolide I, two representative compounds, respectively derived from the two herbs, also showed synergistic antithrombotic effects. Further analysis suggested that they may regulate thrombi formation at different levels via multiple signaling pathways, including oxidative stress, platelet activation and coagulation cascade. Taken together, our findings provided solid biological supports toward the drug compatibility theory of TCM, and suggested cryptotanshinone and senkyunolide I as promising drug candidates in thrombosis management.
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