ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Longsheng Zhang,Qianwei Ding,Yunpeng Huang,Huahao Gu,Yue-E Miao,Tianxi Liu
The practical applications of transition metal oxides and hydroxides for supercapacitors are restricted by their intrinsic poor conductivity, large volumetric expansion, and rapid capacitance fading upon cycling, which can be solved by optimizing these materials to nanostructures and confining them within conductive carbonaceous frameworks. In this work, flexible hybrid membranes with ultrathin Ni(OH)2 nanoplatelets vertically and uniformly anchored on the electrospun carbon nanofibers (CNF) have been facilely prepared as electrode materials for supercapacitors. The Ni(OH)2/CNF hybrid membranes with three-dimensional macroporous architectures as well as hierarchical nanostructures can provide open and continuous channels for rapid diffusion of electrolyte to access the electrochemically active Ni(OH)2 nanoplatelets. Moreover, the carbon nanofiber can act both as a conductive core to provide efficient transport of electrons for fast Faradaic redox reactions of the Ni(OH)2 sheath, and as a buffering matrix to mitigate the local volumetric expansion/contraction upon long-term cycling. As a consequence, the optimized Ni(OH)2/CNF hybrid membrane exhibits a high specific capacitance of 2523 F g–1 (based on the mass of Ni(OH)2, that is 701 F g–1 based on the total mass) at a scan rate of 5 mV s–1. The Ni(OH)2/CNF hybrid membranes with high mechanical flexibility, superior electrical conductivity, and remarkably improved electrochemical capacitance are condsidered as promising flexible electrode materials for high-performance supercapacitors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xuancheng Wang,Xuezhang Xiao,Jiaguang Zheng,Zhouming Hang,Wenping Lin,Zhendong Yao,Meng Zhang,Lixin Chen
Magnesium borohydride , Mg(BH 4 ) 2 , is ball-milled with Ti nano-particles. Such catalyzed Mg(BH 4 ) 2 releases more hydrogen than pristine Mg(BH 4 ) 2 does during isothermal dehydrogenation at 270, 280, and 290 °C. The catalyzed Mg(BH 4 ) 2 also exhibits better dehydrogenation kinetics than the pristine Mg(BH 4 ) 2 . Based on kinetics model fitting, the activation energy ( E a ) of the catalyzed Mg(BH 4 ) 2 is calculated to be lower than pristine Mg(BH 4 ) 2 . During partial dehydrogenation , the catalyzed Mg(BH 4 ) 2 releases 4.23 wt % (wt%) H 2 for the second dehydrogenation at 270 °C, comparing to 4.05, and 3.75 wt% H 2 at 280, and 290 °C. The reversibility of 4.23 wt% capacity is also one of the highest for Mg(BH 4 ) 2 dehydrogenation under mild conditions such as 270 °C as reported. 4 cycles of Mg(BH 4 ) 2 dehydrogenation are conducted at 270 °C. The capacities degrade during 4 cycles and tend to be stable at about 3.0 wt% for the last two cycles. By analyzing the hydrogen de/absorption products of the catalyzed sample, Mg(BH 4 ) 2 is found to be regenerated after rehydrogenation according to Fourier Transform Infrared (FTIR) spectroscopy. Ti nano-particles can react with Mg(BH 4 ) 2 during ball-milling and de/rehydrogenation. The products include TiH 1.924 , TiB, and TiB 2 , which can improve the dehydrogenation properties of Mg(BH 4 ) 2 from a multiple aspect.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yujie Lv,Bao Zhang,Haixiang Huang,Xuebin Yu,Tingting Xu,Jinting Chen,Bogu Liu,Jianguang Yuan,Guanglin Xia,Ying Wu
The 0.55LiBH 4 -0.45Mg(BH 4 ) 2 (LMBH) eutectic composite is promising for solid-state hydrogen storage, as it exhibits a high hydrogen capacity and a very low initial dehydrogenation temperature. However, its main hydrogen release steps still require higher temperatures. In the present study, few-layer Ti 2 C has been synthesized and utilized as catalysts in the LMBH. Compositing LMBH with varying amounts of Ti 2 C (10, 20, 30, and 40 wt%) results in low initial dehydrogenation temperatures (164–110 °C), fast desorption rates and high hydrogen capacities (7.5–10.5 wt%) at a low temperature of 260 °C. The LMBH-30Ti 2 C composite yields 6.5 wt% H 2 even at as low as 200 °C. Additionally, the LMBH-30Ti 2 C composite could reversibly store 3.5 wt% H 2 during the second to fourth dehydrogenation cycles without degradation. The outstanding hydrogen storage performance could be attributed to decomposition driven by reactions between high-valence Ti ions and LMBH, the in-situ formation of the active metal Ti catalyst, and the prevention of aggregation in the Ti 2 C-doped LMBH.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiaguang Zheng,Xuancheng Wang,Xuezhang Xiao,Hao Cheng,Liuting Zhang,Lixin Chen
Two dual-cation transition metal fluorides K 2 TiF 6 and K 2 NbF 7 are introduced into Mg(BH 4 ) 2 by ball-milling to catalyze the dehydrogenation of Mg(BH 4 ) 2 . According to the DSC and TPD results, the onset dehydrogenation temperature of Mg(BH 4 ) 2 doped with K 2 TiF 6 and K 2 NbF 7 are remarkably reduced to 105.4 and 118.0 °C, respectively. Meanwhile, both the K 2 TiF 6 and K 2 NbF 7 catalyzed systems can release more than 6.4 wt% H 2 under 280 °C, showing an improvement in dehydrogenation kinetics. In addition, the reversible capacity of the Mg(BH 4 ) 2 –3%K 2 TiF 6 system is 2.7 wt% at 280 °C in 250 min, which is enhanced comparing to that of pristine Mg(BH 4 ) 2 . X-ray diffraction, Fourier-transformed infrared and 11 B nuclear magnetic resonance investigations reveal that the K 2 TiF 6 actually acts as a catalytic precursor to react with Mg(BH 4 ) 2 , forming active hydrides of KBH 4 and TiH 2 , which further serve as catalyzing agents to facilitate the re-generation of Mg(BH 4 ) 2 from intermediates under moderate conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Jiaguang Zheng,Zhendong Yao,Xuezhang Xiao,Xuancheng Wang,Jiahuan He,Man Chen,Hao Cheng,Liuting Zhang,Lixin Chen
Novel porous hollow carbon nanospheres (HCNS) have been synthesized and utilized as scaffold for LiBH 4 –Mg(BH 4 ) 2 eutectic borohydride (LMBH). Large loading amounts of LMBH (33, 50 and 67 wt%) have been melt-infiltrated into HCNS, and the significantly improved dehydrogenation properties have been discovered. The LMBH@HCNS composites not only exhibit high actual dehydrogenation amounts and fast hydrogen desorption rates, but also an increased reversible hydrogen storage capacities after three cycles without obvious degradation. Further structural tests have revealed that the over-infiltrated LMBH covering the spherical surface of HCNS could also contribute to the improved hydrogen storage behaviors, due to a strong interfacial adhesion effect that avoid LMBH from aggregation during de/rehydrogenation cycles.
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高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Tianyao Pei,Zheng Tang,Dequan Jiang,Chen Li,Yingying Ma,En Chen,Binbin Yue,Yonggang Wang
Sr8(Al12O24)(CrO4)2 (SACR) is a kind of aluminate sodalite, which has been found to have a ferroelectric phase transition near room temperature. The main reason for a phase transition is the freezing of anionic group orientation caused by temperature reduction. The β-cage based on the AlO4 framework with abundant vacancies also brings new possibilities for introducing functional ions. For effectively optimizing its properties, chemical doping is a common modification method. In this study, we reported the (Sr1–xCdx)8(Al12O24)(CrO4)2 series doped at the central cationic site of β-cage and the Sr8(Al12O24)(Cr1–xRexO4)2 series doped at the central anionic site of the molecular cage and compared the effect of doping at different point sites on the phase transformation properties of SACR. Among them, the cationic site doping is not complete and does not affect the phase transition temperature, and the phase transitions are still first-order phase transitions with thermal effect. For the doping of the anionic site, a complete doping series is achieved, and the new end compound Sr8(Al12O24)(ReO4)2 is synthesized. Compared with Sr8(Al12O24)(CrO4)2, the phase transition behavior of Sr8(Al12O24)(ReO4)2 is obviously different, and there is no orthorhombic–tetragonal phase transition between 103 and 450 K.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Changlin Liao,Renping Cao,Wudi Wang,Wen Hu,Guotai Zheng,Zhiyang Luo,Pan Liu
NaY(MoO 4 ) 2 :R (R = Sm 3+ /Bi 3+ , Tb 3+ /Bi 3+ , Sm 3+ /Tb 3+ ) phosphors are synthesized by solid-state reaction method in air. The crystal structures, excitation and emission spectra, luminescence properties, the lifetimes, and the dopant concentration influences are investigated. The emission intensity of activators Sm 3+ and Tb 3+ can be enhanced ∼3.04 and 1.64 times due to energy transfer (ET) from Bi 3+ to Sm 3+ /Tb 3+ . NaY(MoO 4 ) 2 :Sm 3+ , Tb 3+ phosphor with excitation 300 nm shows a tunable emission from red to yellow with change Sm 3+ or Tb 3+ ion concentration. Emission intensity of NaY(MoO 4 ) 2 :Sm 3+ phosphor can be enhanced ∼2.24 times via co-doping Tb 3+ ion owing to ET from Tb 3+ to Sm 3+ ions. The results indicate that ET between sensitizer and activator (Bi 3+ → Tb 3+ , Bi 3+ → Sm 3+ , and Tb 3+ → Sm 3+ ) is beneficial to improve the luminescence properties of activator (Sm 3+ and Tb 3+ ). ET and luminous meachanisms are explained by energy level diagrams of Bi 3+ , Tb 3+ , and Sm 3+ ions.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Wanli Li,Zhaoyang Chen,Bo Zhang,Pengjun Zhao,Yanwei Fan
Highly thermally stable BaZn 2 (PO 4 ) 2 : Dy 3+ /Eu 3+ glass-ceramic (GC) phosphors were synthesized using a high-temperature solid-state reaction and controlled-temperature pre-crystallization method. It is found that Dy 3+ -doped BaZn 2 (PO 4 ) 2 GC phosphors produce cold white light emission at 484 nm and 575 nm under 350 nm excitation with the optimal Dy 3+ doping concentration of 0.25 mol%. The theoretical analysis indicates that the dipole-dipole interaction might be the origin of the concentration quenching mechanism of phosphor. The Eu 3+ -doped BaZn 2 (PO 4 ) 2 GC phosphors produce orange-red emission at 592, 616, 654 and 700 nm under 395 nm excitation. More than that, tunable white light emission can be achieved by optimize the co-doped concentration of Eu 3+ on BaZn 2 (PO 4 ) 2 : 0.25Dy 3+ GC phosphor. The emission spectral intensity and luminescence decay curves from BaZn 2 (PO 4 ) 2 : 0.25Dy 3+ /yEu 3+ (range of y) GC phosphors show the energy transfer from Dy 3+ to Eu 3+ and the emission color can be tuned from cool white to warm white region with the color correlated temperatures (CCTs) reduction from 7299 K to 2520 K. The typical BaZn 2 (PO 4 ) 2 : 0.25Dy 3+ /1Eu 3+ GC phosphors have a high thermal stability with an activation energy of 0.30641 eV. Finally, the white LED devices were fabricated by coupling a 363 nm UV light-emitting diode chip with the BaZn 2 (PO 4 ) 2 : 0.25Dy 3+ /yEu 3+ GC phosphors. These results suggest that BaZn 2 (PO 4 ) 2 : Dy 3+ /Eu 3+ GC phosphors may be suitable candidates for single-component white light-emitting phosphors for application in UV-WLEDs.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·1085-1089
·
IF 1.338
Yuan Lin,Jia Guo Kai,Li Zhong Yan,Zhang Min,Yuan Xian You
A series of novel sodium (5-methyl-2-alkyl-1,3-dioxane-5-yl) carboxylate surfactants were synthesized using nanosolid superacid SO4
2−/Fe2O3 as a catalyst and characterized by 1H NMR, IR and elemental analysis. The critical
micelle concentration (CMC) of surfactants was determined and the results showed that the CMC values were less than 2.0 × 10−3 mol/L. Other relevant surface properties (Krafft point, emulsion stability, foam ability, degradability) were also evaluated. It was suggested
that with respect to emulsion formation, foam stability and the range of application temperature, compared with traditional surfactants, the new surfactants could give better results and showed better properties when used as an emulsifier in emulsion polymerization. In addition, the surfactants
were stable under neutral and alkaline conditions, and could form solid under acid condition. The solid will generate the original surfactants for reuse with alkali. Sodium (5-methyl-2-alkyl-1,3-dioxane-5-yl) carboxylate is likely to be a new type of ‘environmentally friendly’
surfactant.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 3
·2201-2205
·
IF 1.483
Yuan Lin,Li Zhong Yan,Zhang Min,Yuan Xian You,Zhu Xiao Qing
A series of novel sodium 2-alkyl-5-(ethoxycarbonyl)-1,3-dioxane-5-carboxylate surfactants were synthesized in high yield using nanosolid superacid sulfonated carbon as a catalyst and characterized by 1H NMR, IR and elemental analysis. Critical micelle concentration (CMC)
of the surfactants was determined and the results showed that the CMC values were less than 1.0 × 10–3 mol/L. Other relevant surface properties were also evaluated, such as emulsion stability, foam ability and degradability. In relation to emulsion formation, foam stability
and the range of application of temperature, the new surfactants showed better properties than traditional surfactants when used as an emulsifier in emulsion polymerization. Moreover, the surfactants were stable under alkaline and neutral conditions, and degraded into raw materials under acid
condition. Convenient synthesis process with high yield and superior properties promisingly make the title compounds to be a type of ‘environmentally friendly’ surfactants.
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高影响因子
Molecular Medicine Reports
·
2024
·Vol. 29
·期 3
·1-12
·
IF 3.4
Mi-Hua Liu,Xiao-Long Lin,Le-Le Xiao
Hyperphosphatemia or severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) infection can promote cardiovascular adverse events in patients with chronic kidney disease. Hyperphosphatemia is associated with elevated inflammation and sterol regulatory element binding protein 2 (SREBP2) activation, but the underlying mechanisms in SARS‑CoV‑2 that are related to cardiovascular disease remain unclear. The present study aimed to elucidate the role of excess inorganic phosphate (PI) in SARS‑CoV‑2 N protein‑induced NLRP3 inflammasome activation and the underlying mechanisms in vascular smooth muscle cells (VSMCs). The expression levels of SARS‑CoV‑2 N protein, SREBP cleavage‑activating protein (SCAP), mature N‑terminal SREBP2, NLRP3, procaspase‑1, cleaved caspase‑1, IL‑1β and IL‑18 were examined by western blotting. The expression levels of SREBP2, HMG‑CoA reductase, HMGCS1, low density lipoprotein receptor, proprotein convertase subtilisin/kexin type 9 (PCSK9), SREBP1c, fatty acid synthase, stearyl coenzyme A desaturase 1, acetyl‑CoA carboxylase α and ATP‑citrate lyase were determined by reverse transcription‑quantitative PCR. The translocation of SCAP or NLRP3 from the endoplasmic reticulum to the Golgi was detected by confocal microscopy. The results showed that excess PI promoted SCAP‑SREBP and NLRP3 complex translocation to the Golgi, potentially leading to NLRP3 inflammasome activation and lipogenic gene expression. Furthermore, PI amplified SARS‑CoV‑2 N protein‑induced inflammation via the SCAP‑SREBP pathway, which facilitates NLRP3 inflammasome assembly and activation. Inhibition of phosphate uptake with phosphonoformate sodium alleviated NLRP3 inflammasome activation and reduced SREBP‑mediated lipogenic gene expression in VSMCs stimulated with PI and with SARS‑CoV‑2 N protein overexpression. Inhibition of SREBP2 or small interfering RNA‑induced silencing of SREBP2 effectively suppressed the effect of PI and SARS‑CoV‑2 N protein on NLRP3 inflammasome activation and lipogenic gene expression. In conclusion, the present study identified that PI amplified SARS‑CoV‑2 N protein‑induced NLRP3 inflammasome activation and lipogenic gene expression via the SCAP‑SREBP signaling pathway.
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting and environmental remediation.
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产品关联
DOI
PubMed
高影响因子
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