SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-9
·
IF 0
Zhang Liuting,Ji Liang,Yao Zhendong,Cai Zeliang,Sun Ze,Yan Nianhua,Zhu Xinqiao
The hydrogen storage properties of MgH 2 – x wt%TiCN ( x = 5, 10, 15) composites were systematically investigated and the results show that the addition of TiCN can effectively improve the de/rehydrogenation kinetics of MgH 2 . Taken the onset dehydrogenation temperature and isothermal de/rehydrogenation kinetics into consideration, the MgH 2 –10 wt% TiCN composite was shown to have the best performance. It was found that the MgH 2 –10 wt% TiCN composite could release 4 wt% H 2 in 17.3 min at 300 °C while the as-synthesized MgH 2 could not release any hydrogen under the same condition. Besides, the MgH 2 –10 wt% TiCN composite could absorb 4.63 wt% H 2 under 3.2 MPa hydrogen pressure at 300 °C within 20 s. Compared with as-synthesized MgH 2 , the activation energy of the MgH 2 –10 wt% TiCN composite was significantly decreased from 183.76 ± 10 to 106.82 ± 5 kJ/mol. X-ray diffraction analysis revealed that the TiCN remained stable during the ball milling and the following de/rehydrogenation cycle. The catalytic mechanism was also proposed that the TiCN particles absorbed on MgH 2 not only served as charge transfer centers and accelerated the hydrogen incorporation and dissociation rate but also provided more diffusion channels for hydrogen, which contributed to the good de/rehydrogenation properties of MgH 2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 8
·3761-3769
·
IF 2.097
Zhang Shen,Li Junhong,Huang Suiyuan,Ma Xinru,Zhang Caifeng
As an effective way to detect quercetin (Que), it was important to synthesize fluorescent probe with excellent performance by simple method. In this work, the facile one-pot approach was successfully developed to prepare blue-emitting copper nanoclusters (Cu NCs) by protection of polyethyleneimine (PEI) and chemical reduction in hydrazine hydrate. The water-soluble nanoclusters displayed the properties of strong fluorescence intensity and good stability. The PEI-Cu NCs showed maximum luminescence at 468 nm when excited at 375 nm. Based on the static quenching and inner filter effect mechanism, one sensitive and selective sensor for Que detection was established. The detection limit was 0.072 μM and two linear relationships existed in the range of 0.1–90 and 110–200 μM. Moreover, the PEI-Cu NCs probe was successfully employed to detect Que in real water samples. Graphic abstract In this work, rarely reported, polyethyleneimine-capped copper nanoclusters were applied in detecting quercetin with high sensitivity and excellent selectivity.
研究领域:
化学
·
生物分析
·
材料科学
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 35
·期 8
·1642-1649
·
IF 2.199
Wang Yushun,Du Tao,Fang Xin,Meng Da,Li Gang,Liu Liying
CO 2 capture from humid flue gas is always costly due to the irreplaceable pretreatment of dehydration in current processes, which creates an urgent demand for moisture-insensitive adsorbents with considerable CO 2 uptakes as well as remarkable H 2 O tolerances. In the present work, the microporous titanium silicate molecular sieve ETS-10 was synthesized with coal fly ash as the only silica source. The as-synthesized ETS-10 was characterized by X-ray diffraction, scanning electronic microscopy and infrared spectroscopy to verify its crystal morphology, in which neither impurity nor aggregation was observed. The following CO 2 adsorption experiments on the thermal gravimetric analyzer demonstrated its similar CO 2 adsorption capacity yet dramatical adsorption kinetics among some other microporous materials, e.g., potassium chabazite. These specific properties consequently guaranteed its favorable CO 2 adsorption capacity even at high temperatures (1.35 mmol/g at 393 K) and shortened the breakthrough time of single CO 2 flow to less than 20 s. In CO 2 /H 2 O binary breakthrough experiments, the as-obtained ETS-10 still maintained excellent CO 2 uptake of 0.81 mmol/g at 323 K, regardless of the presence of water vapor, making it a promising substitute for direct CO 2 separation from humid flue gases at practical conditions of post-combustion adsorption.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 9
·11845-11856
·
IF 2.478
Lin Xiongwei,Zhao Xiaobo,Zhou Lei,Zhao Mingrui,Lin Yi,Yao Yingbang,Liang Bo,Tao Tao,Lu Sheng-Guo
Lead-free relaxor ferroelectric ceramics with high recoverable energy storage density and energy storage efficiency over a broad temperature and frequency range are attractive for pulsed power capacitor applications. In this work, novel barium zirconate titanate-based lead-free relaxor ferroelectric ceramics are designed via introduction of Bi(Zn 0.5 Sn 0.5 )O 3 with heterovalent ion substitution at both A- and B-sites which could disrupt long-range order, induce polar nanoregions (PNRs), and reduce remnant polarization ( P r ). The (1 − x )Ba(Zr 0.15 Ti 0.85 )O 3 – x Bi(Zn 0.5 Sn 0.5 )O 3 ((1 − x )BZT– x BZS) ( x = 0.02, 0.06, 0.10, and 0.14) ceramics were prepared using a conventional solid-state reaction method. In addition, the structure, dielectric, ferroelectric, and energy storage properties of (1 − x )BZT– x BZS ceramics were systematically studied. All (1 − x )BZT– x BZS ceramics exhibited pure perovskite structure. With the increase of BZS content, the relaxor ferroelectric feature of (1 − x )BZT– x BZS ceramics tended to increase gradually, and slim linear P – E loops were obtained in x = 0.10–0.14. A high recoverable energy storage density W rec of 2.16 J/cm 3 and a high energy storage efficiency η of 90.3% were simultaneously achieved in x = 0.10 at 250 kV/cm, together with excellent temperature and frequency stability, which were superior to those of the reported barium zirconate titanate-based ceramics. Our work provides an effective strategy to optimize the energy storage performance of lead-free barium zirconate titanate-based ceramics toward practical applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Wu Jian,Chen Zhen,Wang Jun,Wang Yiqun,Jiang Jian,Xiao Weiqiang,Xia Qian,Zhang Jiabao,Zhou Guojun,Zhang Junsong,Liang Miao
Cigar tobacco residues are a special air-cured tobacco material with increasing production in domestic. In this present study, the effect of glycerol addition on the pyrolysis characteristic, kinetic behavior, and release of pyrolytic products was investigated by using thermogravimetry coupled with online FTIR and self-built infrared tubular furnace. The thermal weight loss process of cigar tobacco could be divided into four stages, and the glycerol exhibited significant impact on the pyrolysis process. The stage II corresponding the decomposition of volatile components and hemicellulose shifted to the lower temperature accompanied with an increase of DTG max and weight loss at this stage. The T i , T f , and residues were decreased, while the CPI was increased as for the CT-G sample, indicating an increased reactivity and comprehensive pyrolysis performance. Gauss peak fitting was used to separate the pyrolysis process of different pseudocomponents in the tobacco biomass. Pyrolysis kinetic analysis based on Coats-Redfern method showed that the activation energy for the decomposition of each pseudocomponents decreased after the addition of glycerol. The online FTIR and MS analysis also reflected the interaction between glycerol and biomass through the release of pyrolytic gaseous products. GC–MS was further used to analyze the compositions of pyrolytic products in the trapped particulate matter under different heating rates. High heating rate was beneficial for the sufficient release of pyrolysis products and aroma compounds. The glycerol addition inhibited the generation of alkaloids, phenols, esters, ketones, acids, and heterocyclic compounds, indicating some effect may exist between cigar tobacco and glycerol.
研究领域:
能源科学
·
化学工程
·
烟草科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 32
·期 1
·430-441
·
IF 2.22
Liu Yuping,Wu Peng,Kang Peng,Li Liuyang,Shi Jinchao,Zhou Zheng,Chen Guang-xin,Li Qifang
With the development of new mobile communication systems, the composite substrate used for the wideband antennas will show a suitable dielectric constant, low dielectric loss, and good dielectric stability in a wide frequency range. In this work, a kind of dielectric filler, Sr 2+ -doped CaCu 3 Ti 4 O 12 nanowires (Ca 1− x Sr x Cu 3 Ti 4 O 12 NWs, x SCCTO NWs), was synthesized via a two-step hydrothermal method for the first time. The composites were then prepared by adding the obtained filler to polydimethylsiloxane (PDMS). Results revealed that Sr 2+ doping can significantly reduce the dielectric loss of composites and stabilize both the dielectric constant and the dielectric loss in a wide frequency range compared with those of CCTO NWs–PDMS composites. Moreover, 0.4SCCTO NWs–PDMS composites exhibit high thermal stability, tensile strength, breakdown strength, and energy density. These properties effectively broaden the frequency range of the PDMS based composites, which are very suitable for the application in flexible wideband antenna substrate materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 1
·449-456
·
IF 2.289
Zheng Li,Zhang Wen,Guo Jun
A modified electrode Ni(II)–ARS/GR/CPE has been fabricated by electrodepositing nickel(II)–alizarin red complex on the surface of graphene-modified carbon paste electrode (GR/CPE) in alkaline solution. The modified electrode is characterized by scanning electron microscopy, Fourier transform infrared spectrometry, x-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. It exhibits the characteristic of improved reversibility and enhanced current responses of the Ni(III)/Ni(II) couple compared with Ni(II)–ARS/CPE. It also shows enhanced electrocatalytic activity toward the oxidation of formamide, which is due to the high surface area and facile charge–transfer ability of graphene and Ni(II)–ARS complex. The mechanisms of film formation and the catalytic process are also discussed. Moreover, the catalytic currents present linear dependence on the concentration of formamide from 0.5 mM to 0.21 M by amperometry; the detection limit is 0.15 mM. The modified electrode for formamide determination is of the property of simple preparation, good stability, fast response, and acceptable sensitivity.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2021
·Vol. 16
·期 8
·1-10
·
IF 4.357
Shen Zhichao,Zhan Lu,Xu Zhenming
Current study proposes a green regeneration method of activated carbon (AC) laden with Perfluorochemicals (PFCs) from the perspective of environmental safety and resource regeneration. The defluorination efficiencies of AC adsorbed perfluorooctanesulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutanesulfonate (PFBS) using three molten sodium salts and one molten alkali were compared. Results showed that defluorination efficiencies of molten NaOH for the three PFCs were higher than the other three molten sodium salts at lower temperature. At 700°C, the defluorination efficiencies of PFOS and PFBS using molten NaOH reached to 84.2% and 79.2%, respectively, while the defluorination efficiency of PFOA was 35.3%. In addition, the temperature of molten salt, the holding time and the ratio of salt to carbon were directly proportional to the defluorination efficiency. The low defluorination efficiency of PFOA was due to the low thermal stability of PFOA, which made it difficult to be captured by molten salt. The weight loss range of PFOA was 75°C–125°C, which was much lower than PFOS and PFBS (400°C–500°C). From the perspective of gas production, fluorine-containing gases produced from molten NaOH-treated AC were significantly reduced, which means that environmental risks were significantly reduced. After molten NaOH treatment, the regenerated AC had higher adsorption capacity than that of pre-treated AC.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-12
·
IF 14.919
Han Cuiping,Li Hongfei,Li Yu,Zhu Jiaxiong,Zhi Chunyi
Rechargeable calcium-ion batteries are intriguing alternatives for use as post-lithium-ion batteries. However, the high charge density of divalent Ca 2+ establishes a strong electrostatic interaction with the hosting lattice, which results in low-capacity Ca-ion storage. The ionic radius of Ca 2+ further leads to sluggish ionic diffusion, hindering high-rate capability performances. Here, we report 5,7,12,14-pentacenetetrone (PT) as an organic crystal electrode active material for aqueous Ca-ion storage. The weak π-π stacked layers of the PT molecules render a flexible and robust structure suitable for Ca-ion storage. In addition, the channels within the PT crystal provide efficient pathways for fast ionic diffusion. The PT anode exhibits large specific capacity (150.5 mAh g -1 at 5 A g -1 ), high-rate capability (86.1 mAh g -1 at 100 A g -1 ) and favorable low-temperature performances. A mechanistic study identifies proton-assisted uptake/removal of Ca 2+ in PT during cycling. First principle calculations suggest that the Ca ions tend to stay in the interstitial space of the PT channels and are stabilized by carbonyls from adjacent PT molecules. Finally, pairing with a high-voltage positive electrode, a full aqueous Ca-ion cell is assembled and tested.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2014
·Vol. 41
·期 10
·7695-7702
·
IF 1.54
Jin Qingdong,Li Fubo,Li Ying,Jin Fei,Jiang Lin
A series of α-alkoxyimino-[1-(4-methylpiperazino-1-yl)carbonylmethyl-1 H -benzimidazol-2-yl] acetonitriles were synthesized from o -phenylenediamine, ethyl cyanoacetate, chloroacetyl piperazine, and haloalkane/benzyl chloride by multi-step reactions. The structures of the target compounds were elucidated by IR, 1 H NMR, MS, and elemental analysis. All the target compounds were tested for in vitro antifungal activities against Sclerotinia sclerotiorum and Botrytis cinerea by the mycelium growth rate method, and the results indicated that some compounds displayed higher antifungal activity as compared to carbendazim.
研究领域:
药物化学
·
植物病理学
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2020
·Vol. 63
·期 12
·1727-1733
·
IF 6.356
Ren Xinyi,Liu Song,Li Huicong,Ding Jie,Liu Linghui,Kuang Zhichong,Li Ling,Yang Hongbin,Bai Fuquan,Huang Yanqiang,Zhang Tao,Liu Bin
Electrochemical carbon dioxide reduction reaction (CO 2 RR) powered by renewable electricity offers an attractive approach to reduce carbon emission and at the same time produce valuable chemicals/fuels. To design efficient CO 2 reduction electrocatalyst, it is important to understand the structure-activity relationship. Herein, we design a series of single Co atoms electrocatalysts with well-defined active sites electronic structures, which exhibit outstanding CO 2 RR activity with controllable selectivity to CO. Experimental and density functional theory (DFT) calculation studies show that introducing nitro (amino) ligand next to single Co atom catalytic center with electron-withdrawing (electron-donating) capability favors (hinders) CO 2 reduction catalysis. This work provides an in-depth understanding of how functional ligand affects the splitting of transition metal 3d electron orbital, thereby changing the electron transfer from transition metal active site to CO 2 , which is closely related to the Gibbs free energy of the rate-determining step (CO 2 +e − +*→*CO 2 − ).
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2022
·Vol. 12
·期 1
·1-11
·
IF 4.996
Yang Jie,Suo Xidong,Zhao Jingjing,Wang Jing,Zhou Runye,Zhang Yu,Zhang Yifei,Qiao Hongtao,Luo Xiaohang
To date, various solar driven evaporation technologies have been developed for treatment of seawater and wastewater but with the threat from salt polluted and single treatment of seawater. Herein, we develop a multifunctional evaporator constructed by carbon fiber coated by quinoa cellulose nanosheet (CFQC) with outstanding self-cleaning performance and good purification property for treatment of organic and antibiotic polluted water. The resulting Zn-CFQC exhibits good light to thermal performance which can absorb about 86.95% lights in the range of UV–Vis–NIR (200–2500 nm); therefore, the wet and dry surface temperatures of Zn-CFQC are held at 62.1 and 124.3 °C respectively, and keep a speed of 3.2 kg m −2 h −1 for water evaporating under 1000 W m −2 illumination. Such good light-to-thermal capabilities can be mainly imputed to the unique surface microstructures of the carbon fiber which decorated by two-dimension cellulose and activated by ZnCl 2 . Additionally, Zn-CFQC shows good salt automatic-cleaning capability at night and corresponding mechanism has been simply elucidated according to the chemical potential theory. The method of treatment of carbon fiber opens a new way for commercial carbon fiber utilization of solar assisted water purification.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）