Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 22
·13473-13482
·
IF 10.733
Kailun Zou,Yu Dan,Yuxi Yu,Ying Zhang,Qingfeng Zhang,Yinmei Lu,Haitao Huang,Xin Zhang,Yunbin He
Dielectric nanocomposites composed of a polymer matrix with high electric breakdown strength and inorganic ferroelectric nanofillers with large maximum electric displacement (Dmax) have recently attracted much attention due to their high power density, superior flexibility, and good fatigue endurance. However, their discharge energy density and energy efficiency are limited because of the high remnant displacement (Dr) and small Dmax − Dr values of the ferroelectric fillers. Compared with ferroelectrics, antiferroelectrics exhibit much lower Dr (near zero) and far larger Dmax − Dr values, and thus if they are used as the fillers of the dielectric composite, a larger discharge energy density and higher energy efficiency may be obtained simultaneously. Based on this, in this work, Pb0.97La0.02(Zr0.50Sn0.45Ti0.05)O3 (PLZST) antiferroelectric nanoparticles (∼200 nm in diameter) coated with a dense and robust dopamine layer are prepared in order to develop dopamine-modified PLZST filler/poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) polymer nanocomposites with superior energy storage properties. The experimental results indicate that optimizing the filler content leads to a small Dr (0.61 μC cm−2), large Dmax − Dr value (6.14 μC cm−2), and high electric breakdown strength (3136 kV cm−1), as a result of which, the PLZST/P(VDF-HFP) nanocomposites filled with 5 wt% dopamine-modified PLZST nanoparticles simultaneously exhibit a large discharge energy density of 9.39 J cm−3 and high energy efficiency of 82%. These energy storage properties are superior to those of most ferroelectric filler (including nanowires and nanofibers prepared by complicated methods)/polymer nanocomposites with a single-layer structure. Our work not only proves that, antiferroelectric nanoparticles are excellent fillers that can be comparable to, or even better than, ferroelectric nanowires and nanofibers prepared by very complicated methods, for energy-storage inorganic/polymer dielectric composites, but also provides a convenient and effective way to prepare and design flexible dielectric capacitors with superior energy storage capacity.
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高影响因子
CATALYSIS LETTERS
·
2016
·Vol. 147
·期 2
·502-508
·
IF 2.294
Chen Yao,Liu Cheng-chao,Zhang Yu-hua,Zhao Yan-xi,Wei Liang,Wen Xiong,Zhao Xin,Li Jin-lin
Abstract Hierarchically ZSM-5 zeolite was prepared by alkali treatment. It was used as a support for a series of Co-based catalysts for Fischer–Tropsch synthesis with Fe, Ti, Ga or Zn as promoter. This series of catalysts were named Co/M-ZSM-5 (M = Fe, Ti, Ga or Zn). The catalysts were characterized by SEM, XRD, H 2 -TPR, and XPS, and the FTS catalytic performance of catalysts were compared. The character date revealed that the promoter changed the dispersion, reducibility and stability of Co. The addition of Zn and Ga increased the activity of catalysts, decreased the selectivity to CH 4 . The Ti promoted catalyst had the highest initial activity, but it deactivated rapidly. The suitable interaction between Co and the Fe-ZSM-5 result in the suitable dispersion and reduction. Thus Fe is the better promoter for the catalyst Co/ZSM-5. Graphical Abstract
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Jia Guo,Yongqi Zhao,Junjie Jiang,Xiaolong Liu,Yongqiang Wang,Huazhen Chang,Tingyu Zhu
Selective catalytic reduction (SCR) with ammonia (NH 3 ) is an established method for NO x elimination. However, the catalytic activity of conventional VW/Ti catalysts declines sharply at ultra-high temperatures (above 700 °C). To address this limitation, this study employed machine learning (ML) to optimize high-temperature SCR catalysts. A gradient boosting decision tree (GBDT) model with Shapley Additive Explanations (SHAP) identified calcination temperature, crystal phase, and surface acidity as the key factors influencing catalytic performance. Based on these insights, a designstrategy was developed for VW/Ti catalysts under ultra-high temperature conditions and successfully identified a catalyst exhibiting excellent resistance to high-temperature degradation through evaluation and characterization. Experimental validation confirmed that Si doping significantly improves catalytic activity and thermal stability, with the VW/5Ti1Si-800 catalyst demonstrating superior performance. This study highlights the effectiveness of combining ML and experimental approaches to mitigate high-temperature deactivation in SCR catalysts.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Yukun Yang,Wenyan Yan,Xiaomin Wang,Ligang Yu,Jinhua Zhang,Baoqing Bai,Caixia Guo,Sanhong Fan
In this work, a molecularly imprinted photoelectrochemical (MIP-PEC) sensor based on a novel PEC composite of metal-organic frameworks (MOFs) and TiO 2 (NH 2 -MIL-125(Ti)–TiO 2 ) was established for the ultrasensitive and selective detection of oxytetracycline (OTC). This is the first attempt of applying MOFs in the construction of MIP-PEC sensor. The NH 2 -MIL-125(Ti)–TiO 2 was synthesized by a simple one-step solvothermal method and modified onto the surface of indium tin oxide (ITO) electrode as the photosensitive layer. Subsequently, molecularly imprinted polymer (MIP) was modified as recognition element by electropolymerization . The NH 2 -MIL-125(Ti)–TiO 2 showed an enhanced photocurrent response due to stronger light absorption capacity and matched energy band. Furthermore, MIP greatly improved the selectivity and sensitivity of the constructed PEC sensor. The photocurrent response of the MIP-PEC sensor was reduced after OTC recognition because the specific binding of OTC to the imprinted cavities blocked the electron transfer of the electrode. Under optimal experimental conditions, the MIP-PEC sensor exhibited a wide detection range from 0.1 nM to 10 μM with a low limit of detection (LOD) of 60 pM, as well as certain reproducibility, stability and good applicability in real samples. The proposed sensor provides ideas for the application of MOFs in the construction of PEC sensors and will offer an alternative method for the detection of other pollutants in the field of food safety.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiaxin Qu,Xueqian Wang,Langlang Wang,Bowen Xu,Ping Ning,Yixing Ma,Yibing Xie,Rui Cao,Qiang Ma
A nonmetallic N-doped Zr/Ti-based catalyst was prepared to investigate the effect of N addition on catalytic performance for carbon disulfide (CS 2 ) hydrolysis. The characterization of the catalyst indicated that doped N atoms were present as interstitial N in the TiO 2 lattice, resulting in an increase in the number of basic sites of the catalyst from 1.64 to 2.37 and from 0.68 to 2.53 for weakly basic and strongly basic sites, respectively. In addition, the doping of N promoted the formation of OH groups, which were favorable for the hydrolysis of CS 2 , from water (H 2 O) adsorbed on the catalyst, thus greatly improving the performance of catalytic CS 2 hydrolysis. However, N doping reduced the amount of chemisorbed oxygen on the catalyst surface from 44.7% to 33.4%, thus decreasing the oxidation reaction of the hydrolysis product H 2 S and improving the stability of the catalyst. CS 2 hydrolysis reaction activity and catalyst lifetime were tested. The experimental results demonstrated that the catalytic CS 2 hydrolysis performance was greatly improved after N doping, and the temperature to obtain 100% conversion was reduced from 180 °C to 130 °C. Selectivity to H 2 S was greatly improved with N-doped catalysts. Furthermore, the resistance of the catalyst to sulfate was improved. Nonmetallic N-doped Zr/Ti-based catalysts offer a new strategy for blast furnace gas desulfurization.
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高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Lei Zheng,Lixia Sun,Jiangbo Qiu,Junling Song,Luyi Zou,Yue Teng,Yongzhong Zong,Hongyan Yu
The coexistence of inorganic and organic contaminants is a challenge for real-life water treatment applications. Therefore, in this research, we used NH 2 -MIL-125(Ti) to evaluate the single adsorption of hexavalent chromium (Cr(VI)) or Rhodamine B (RhB) in an aqueous solution and further investigate simultaneous adsorption experiments to compare the adsorption behavior changes. The main influencing factors, for example, reaction time, initial concentration, reaction temperature, and pH were studied in detail. In all reaction systems, the pseudo-second-order kinetic and Langmuir isotherm models were well illuminated the adsorption progress of Cr(VI) and RhB. Thermodynamic studies showed that the adsorption process was spontaneous and endothermic. As compared to the single system, the adsorption capacity of Cr(VI) in the binary system gradually decreased as the additive amount of RhB increased, whereas the adsorption capacity of RhB in the binary system was expanded brilliantly. When the binary reaction system contained 100 mg/L Cr(VI), the removal rate of RhB increased to 97.58%. The formation of Cr(VI)-RhB and Cr(III)-RhB complexes was the cause that provided facilitation for the adsorption of RhB. These findings prove that the interactions during the water treatment process between contaminants may obtain additional benefits, contributing to a better adsorption capacity of co-existing contaminant.
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 12
·125006
·
IF 1.62
Peng She,Chun Yao,Jun Li,Hegang Bao,Xiuquan Xu,Hong Zhou
Co-doping is one of the most facile and efficient strategies for boosting the photocatalytic performance of g-C3N4. Herein, a series of Ti and O co-doped g-C3N4 (Ti/OCN) composites with excellent photocatalytic inactivation activity of Enterobacter cloacae (E. cloacae) were successfully synthesized by simple calcination of urea/formic acid/TiCl4 precursor. The obtained Ti/OCN-3 possessed the optimal photocatalytic capability with complete inactivation of 6.20 log CFU·ml−1 E. cloacae under 60 min of visible light irradiation. The improved photocatalytic disinfection performance was probably attributed to the synergistic effect of Ti and O co-doping, which led to an extended visible light response and accelerated charge transport efficiency. Furthermore, scavenger trapping and electron spin resonance (ESR) experiments revealed that ·O2−, h+ and ·OH were responsible for the enhanced inactivation activity. Overall, this research provided a promising strategy for fabricating g-C3N4-based catalysts to efficiently deal with the hazards of pathogenic microorganisms.
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高影响因子
Functional Materials Letters
·
2024
·
IF 1.2
Shenwei Zhang,Dongrui Chen,Wenmin Guo,Xiaoming Wang,Zhibin Ding,Xiaofu Tang,Junxia Zhang,Haijiang Wu,Diping Zeng,Hongqing Wei,Wenjun Wang,Yi Ma,Jinhua Zhou,Zaijun Su
This paper employs electrochemical methods (linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS)) to investigate the electrochemical behavior of platinum, glassy carbon, 304 stainless steel, titanium, and copper in 21 and 1 M LiTFSI electrolytes. The LSV results indicate that the electrochemical stability window of the materials varies with the electrolyte concentration, and the stability window is wider in the high-concentration system. Through Tafel polarization curves and EIS analysis, the overpotential of the charge exchange process differs due to the type of material and the concentration of the electrolyte, mainly attributed to the influence of the proportion of free water, electrolyte viscosity, and SEI film formation on electrode process kinetics. After comparative analysis, glassy carbon exhibits a higher overpotential than other materials at both the cathode and anode, effectively suppressing water decomposition. These findings provide theoretical support for the development of high-performance aqueous lithium-ion battery current collector materials.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Xiangqian Ren,Lianyan Zhu,Bin Guo,Wenting Liu,Shuang Yu,Xingfu Zhou
Ti/TiO 2 NTs/SnO 2 –Sb–Mo anode was prepared by adding intermediate layers and elemental doping and GF/Cu–C 3 N 4 cathode was prepared by impregnation method. The electrode was characterized by SEM, XRD, LSV, CV, and EIS, which show that a more uniform and finer-grained surface structure with higher electrocatalytic activity can be prepared by doping and the addition of TiO 2 -NTs interlayer. In addition, the cathode demonstrate the successful loading of Cu–C 3 N 4 on graphite felts (GFs) by SEM and EDS. The electrochemical test shows the high electrochemical activity. The high activity of the two-electrode system was verified according to the hydroxyl radical test, and then the two electrodes were applied to the degradation of 50 mg/L methylene blue wastewater at the same time, and the results showed that the degradation rate was 98.09% in 20 min, and the COD removal was as high as 80.11%, which is 1.33 times and 2.83 times of the single-anode and single-cathode systems, respectively. In addition, the system could show excellent degradation performance in a wide pH range. At the same time, the energy consumption of the two-electrode system is only 110.9 KWh/Kg. Finally, after ten consecutive decolorization experiments, the decolorization rate of methylene blue and the removal rate of COD could still reach 90.5% and 68.7% in 20 min, which indicated that the dual-electrode system had excellent reusability. The study opens a door to the practical application of electrochemical treatment of wastewater.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Yundong Zeng,Yunlan Xu,Dengjie Zhong,Jiaxin Mou,Haoyang Yao,Nianbing Zhong
The development of photocatalytic fuel cell (PFC) with visible-light response is usually limited by the low efficiency of electron-hole separation in photoanode . In this work, 20%-PTh/Ag 3 PO 4 /BiOI/Ti photoanode was prepared for the first time to construct a PFC with Cu 2 O/Cu cathode to degrade rhodamine B. With visible-light stimulation, the rhodamine B degradation rate, maximum photocurrent density and maximum power density of the PFC were respectively 96.33% (2 h), 0.39 mA cm −2 and 82.20 μW cm −2 . The main active species in the PFC were proved by quenching experiments to be h + , ∙OH and ∙O − 2 . The satisfactory performance of the PFC was due to that a double Z-scheme heterojunction was formed in the photocatalyst of 20%-PTh/Ag 3 PO 4 /BiOI/Ti photoanode, which made the photogenerated electrons of Ag 3 PO 4 and BiOI directly combine with the photogenerated holes of PTh , so that the photogenerated holes of Ag 3 PO 4 and BiOI and the photogenerated electrons of PTh directly or indirectly participated in the degradation reaction of RhB. In this way, the separation efficiency of electron-hole pairs in the photoanode was improved, and the performance of the PFC was significantly enhanced.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ruolan Li,Xingyan Liu,Yacen Tang,Jianning Yu,Ya Chen,Min Fu,Siqi Li,Youzhou He
In this study, a highly efficient bifunctional porphyrin-based MOFs with uniformly in-situ generated g-C 3 N 4 quantum dots (g-CNQDs) was fabricated for photocatalytic hydrogen evolution and NO removal, in which PtTCPP as the organic ligand and mixed Zr/Ti-oxo clusters as the metal nodes. Compared with most reported Zr-based porphyrin MOFs, the g-CNQDs@Zr-MOFs(Pt)(Zr/Ti) exhibited outstanding hydrogen evolution activity (14511.57 μmol g −1 ) and NO removal rate (31.9 %) under visible light irradiation. The obviously improved photocatalytic performance could be attributed to the significantly enhanced charge separation and transfer rates by the mixed Zr/Ti-oxo clusters via the rapid Ti 3+ /Ti 4+ process. Moreover, the uniformly in-situ generated g-CNQDs via confinement effect in the cavity of MOFs could also improve the utilization of visible light especially through the up-conversion effect, and promote charge carriers separation. This work provides an idea for us to expand the scope of light utilization and promote charge transfer and separation rates of MOFs via functionalizing host MOFs matrix and coupling guest active species to improve photocatalytic performance further.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jian Wang,Changchun Chen,Zhihao Zhao,Cheng Cheng,Zhonghai Tang,Zhou Du,Yifeng Wang,Lin Pan
Considerable attentions are currently paid to water pollution, which seriously threats human health. Semiconductor catalysts with step-like (S-scheme) heterojunction are often used for degrading organic pollutants in water bodies due to their high carrier separation efficiency, high redox capacity, and broad light absorption capacity. In this paper, a novel S-scheme N-doped g-C 3 N 4 /NH 2 -MIL-125(Ti) heterojunction composite is synthesized for photodegradation of organic pollutants. The structural measurements indicate that the NH 2 -MIL-125(Ti) nanoparticles are intimately anchored on the surface of porous N-doped g-C 3 N 4 nanosheets . The experimental characterizations as well as the DFT theoretical calculation for samples demonstrate that the N-doped g-C 3 N 4 /NH 2 -MIL-125(Ti) composites not only bear larger specific surface area providing abundant reactive sites, but also improve the separation efficiency of photogenerated carriers during photodegradation. In addition, the degradation rate of RhB solution catalyzed by 25 wt% N-doped g-C 3 N 4 /NH 2 -MIL-125(Ti) (25 wt% NCM) attains the highest degradation rate (96.4%) under visible light irradiation. Moreover, the mineralization of RhB solution and intermediates produced in the degradation process are analyzed by total organic carbon (TOC) and high- performance liquid chromatography (HPLC) tests, respectively. Electron paramagnetic resonance (EPR) with free radical capture measurements show that the photodegradation of RhB is mainly ascribed to the superoxide radicals (·O 2 - ) and hole (h + ). This study provides an effective method to construct S-scheme heterojunction photocatalysts and apply them to wastewater treatment.
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高影响因子
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