JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 22
·20589-20600
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IF 2.22
Zhang Jianxia,Guo Huixiao,Li Shuo,Li Yu,He Yue,Li Xiaosong,Tian Chunxia,Sun Dan,Liu Li
The structure and surface properties of the sensing materials have been considered as the main factors for the fabrication of metal–oxide semiconductor gas sensors. In this paper, a one-step hydrothermal method for the preparation and control of the morphology of α-Fe 2 O 3 is reported. The results show that the amount of glycol has a great influence on the morphology of the products. With the variation in ethylene glycol concentration (from 30 to 110 ml), we can obviously see the product was assembled into three-dimensional porous α-Fe 2 O 3 micro-flower structure from two-dimensional nanochips from scanning electron microscope (SEM) pictures. When the ethylene glycol was 70 ml, the micro-flower structure was the most uniform and perfect. It additionally showed the largest specific surface area (63.69 m 2 /g) and the biggest oxygen vacancy in nitrogen adsorption–desorption and XPS analysis. Further gas sensitivity test showed that gas sensitivity was also the best. Under the low operating temperature (210 °C), the porous α-Fe 2 O 3 micro-flower (70 ml glycol) showed the highest response (49.4) to 100 ppm acetone, the sensitivity of other materials was 8.2/30 ml, 14.7/40 ml, 38.4/50 ml, 36.7/90 ml, 10.3/100 ml, 4.8/110 ml, respectively. In addition, the porous α-Fe 2 O 3 micro-flower (70 ml glycol) has excellent selectivity, short response/recovery time (1 s/31 s), low detection offline (2.2 to 0.2 ppm acetone), and good stability. The reason for the improvement of gas-sensing performance is mainly due to the change of morphology, decrease of crystallite size, the increase of oxygen vacancy, and specific surface area.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
MATERIALS LETTERS
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2021
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IF 3.423
Chunyun Ma,Yan Zhang,Chuankai Yang,Miaorong Zhang,Jianguo Tang
Lipase was immobilized with Cu 3 (PO 4 ) 2 ⋅3H 2 O to synthesize lipase-Cu 3 (PO 4 ) 2 ⋅3H 2 O hybrid microflowers (Lip-MFs). Surfactants (Tween 80, Triton X-100 and CTAB) were added to study their effect on the morphology and activity of Lip-MFs. SEM images revealed that surfactants can increase the size of Lip-MFs and make the hierarchical structure more compact. Further, compared with other surfactants, the activity of CTAB-Lip-MFs was 1.45 times of that of free lipase, demonstrating CTAB is conducive to improve the activity of lipase.
研究领域:
生物化学
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材料科学
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
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2019
·
IF 3.839
Jinfeng Sun,Lingzhi Guo,Miaomiao Gao,Xuan Sun,Jinyang Zhang,Longwei Liang,Yang Liu,Linrui Hou,Changzhou Yuan
Herein, we first report one-step synthesis of uniform Mo 2 C microflowers (MCMFs) from low-cost precursors via industrialized solid-state strategy. With fine optimization in precursor ratio and pyrolysis temperatures, the as-fabricated MCMFs are assembled well with interconnected single-crystalline nanosheet subunits. More encouragingly, the resultant MCMFs are further highlighted as a competitive anode with robust and long-duration lithium-storage behaviors towards high-performance Li-ion batteries
研究领域:
材料科学
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能源存储
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yujuan Cao,Ning Wu,Cuiliu Li,Yuan Chen,Hao Zhang,Hao Guo,Wu Yang
Bimetallic metal-organic frameworks (MOFs) with a controlled morphology are potential materials for boosting the electrochemical performance of supercapacitors owing to their unique structural merits. Herein, a solvent-regulated strategy was proposed to synthesize bimetallic MOFs with various morphologies, such as microflowers, microspheres , and nanosheets , and the possible mechanisms of morphology control during nucleation and crystal growth were analyzed. When employed as electrode materials for supercapacitors, the NiCo-MOF microflowers possessed the biggest specific capacitance, which could achieve 1086 F g −1 at a current density of 1 A g −1 . To further improve the electrochemical performance of materials, NiCo-P was prepared via a low-temperature phosphating method using NiCo-MOF microflowers as the precursor. Electrochemical studies displayed that the NiCo-P(6) microflowers exhibited good capacitance and superior rate capability with specific capacitances of 1592 and 1384 F g −1 at 1 and 20 A g −1 , respectively. Furthermore, an asymmetric supercapacitor assembled by NiCo-P(6) and active carbon exhibited a high energy density of 51.2 Wh kg −1 at a power density of 749.8 W kg −1 and outstanding cycling stability. This work is easy to operate and can be extended to the preparation of other MOF-based electrode materials. The delivered excellent electrochemical performance suggests the resulted flower-like NiCo-P is a promising electrode material for advanced energy storage devices.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
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2018
·Vol. 8
·期 5
·1395-1403
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IF 5.365
Yanyan Duan,Shaochen Zhou,Zhihong Chen,Jianmin Luo,Mei Zhang,Fu Wang,Tao Xu,Chuanyi Wang
An efficient photoelectrochemical water splitting system is developed based on a hierarchical TiO2 nanowire/microflower (H-TiO2) photoanode, which is synthesized via a one-step hydrothermal process. The H-TiO2 structure is formed via three primary self-assembly processes and simultaneously offers excellent ultraviolet light absorption capacity and large specific surface area. The H-TiO2 photoanode achieves a 1.3 fold enhancement in photocurrent density compared to its TiO2 nanowire-based counterpart at 1.23 V vs. reversible hydrogen electrode (the theoretical potential for water electrolysis). More strikingly, by incorporating the surface plasmon resonance (SPR) effect from Au nanoparticles (NPs), the resulting Au/H-TiO2-based photoanodes (Au/H-TiO2) exhibit an about two-fold enhancement in photocurrent density under both simulated sunlight and visible-light illumination. Moreover, the maximum photoconversion efficiency of Au/H-TiO2 gives three fold enhancement compared to that in the absence of Au NPs. Significantly, Au NPs incorporated on the H-TiO2 surface also serve as co-catalysts like Pt under white-light illumination, reducing the onset potential by about 0.15 V and the current saturation potential by about 0.18 V. The enhanced photoactivity under white light is due to the co-action of electron transfer from the efficient carrier separation of H-TiO2 (ultraviolet part) and Au to H-TiO2 under the SPR effect (visible part). The present study provides a new strategy for designing and fabricating TiO2-based devices with favorable energy conversion efficiency for photoelectrochemical water splitting.
研究领域:
材料科学
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能源科学
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光催化
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2020
·
IF 2.029
Jianxia Zhang,Li Liu,Chao Sun,Xiaosong Li,Bing Zhao,Xiangnan Ju,Chunxia Tian,Dan Sun,Guijun Nian
The 3D layered α-Fe 2 O 3 microflowers assembled by pure and Sr-doped nanosheets were prepared by hydrothermal and annealing methods. SEM morphological characterization results show that after the introduction of Sr, the microflowers are assembled from more layered nanosheets. XPS indicates that the material can provide more surface oxygen vacancy defects and oxygen adsorption sites, which is beneficial to the improvement of gas sensitivity. The response of 3 wt% Sr-doped α-Fe 2 O 3 with alkaline earth metal element Sr to 100 ppm ethanol (82.1) is 2.37 times that of pure α-Fe 2 O 3 (34.5) to ethanol at low temperature (220 °C).
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Guangping Xia,Guihua Ruan,Yipeng Huang,Haoyun Hu,Shi Yu,Bingmei Lai,Zhenyu Li,Yun Zhang,Ningli Tang
Herein, uniform magnetic covalent organic framework (MCOF) microflowers were synthesized by facile inlaying aldehyde-functionalized Fe 3 O 4 nanoparticles onto the COF under mechanical stirring at room temperature. The MCOF microflowers kept flower-shaped morphology with high crystallinity and magnetism. In addition, the good water dispersibility and reusability made the MCOF microflowers to be good magnetic solid phase extraction (MSPE) adsorbents for the high-efficiency enrichment of eugenol anesthetics from aquatic products. The MCOF microflowers showed fast adsorption rate (10 min) and high extraction efficiency (above 84.02%) for eugenol anesthetics under optimal conditions. The MCOF microflowers displayed maximum adsorption capacities of 6.67, 12.31, and 16.78 µg g −1 for eugenol, eugenol acetate, and methyl isoeugenol, respectively. The MCOF microflowers based MSPE coupled with high-performance liquid chromatography method was proposed for enrichment and analysis of eugenol anesthetics in tilapia, shrimp and crab samples. The method showed a wide linear of 5.0–500.0 µg kg −1 and low detection limits of 2.4–3.6 μg kg −1 for eugenol anesthetics. The recoveries of spiked eugenol anesthetics ranged from 80.0% to 118.8% with relative standard deviations no>9.2%. Results indicate the high potential of MCOF microflowers to be an adsorbent for efficient extraction and analysis of eugenol anesthetics from complex aquatic product samples.
研究领域:
分析化学
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食品科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 5
·期 22
·11229-11235
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IF 8.867
Jiahao Yu,Gongzhen Cheng,Wei Luo
Developing low-cost, highly efficient, and superior stable electrocatalysts for the oxygen evolution reaction (OER) is essential for upcoming renewable and clean energy systems. Here, 3D ternary nickel iron phosphide microflowers with a hierarchically porous morphology directly grown on Ni foam via a successive hydrothermal and phosphidation method are synthesized. Benefitting from their unique 3D hierarchical microflower-like structure and the strong electron interactions between Fe, Ni and P, the as-synthesized (NixFe1−x)2P catalysts can effectively catalyze the OER with an overpotential of 219 mV at a current density of 20 mA cm−2 in alkaline media, which is, to the best of our knowledge, the best among the reported non-noble metal-based catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 17
·3726-3735
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IF 4.674
Hanyu Yao,Haiping Li,Tingxia Hu,Wanguo Hou
Graphical No wallflower ! BiOCl microflower/nanosheet homojunctions were constructed via a solvent-free route with enhanced photogenerated charge carrier separation and photoactivity. Solvent-free synthesis of bismuth-based photocatalysts with hierarchical architectures has been rarely reported yet. Herein, BiOCl hierarchical microflowers (MFs) were prepared via a solvent-free route for the first time, using chlorobutanol as the chlorine source. The reaction temperature ( T ) plays a key role for formation of MFs. The MFs were formed at T >120 °C and some MFs merged into large nanosheets (LNs). MF/LN homojunctions were constructed because considerable differences in sizes and exposed facets between the MFs and the LNs cause differences in their energy band levels. The sample prepared at 120 °C possesses the highest contents of MFs and homojunctions, specific surface area ( S BET , 13 m 2 g −1 ), and photoactivity, indicating the high photoactivity of the sample arises from fabrication of homojunctions as well as the high S BET . This work provides a solvent-free way to simultaneously synthesize BiOCl MFs and homojunctions, which paves an avenue for solvent-free synthesis of other photocatalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Yuxuan Li,Weixin Li,Lei Zhao,Jing Ge,Xuan He,Wei Fang,Hui Chen
TiO 2 photoanode as the light harvest skeleton and electron transport material plays a critical role in the photovoltaic performance of the quantum dots sensitized solar cells (QDSSCs). In this paper, a bilayer-structured film with micro-flower TiO 2 as an overlayer and hierarchical porous TiO 2 as an underlayer is fabricated. The hierarchical porous TiO 2 film is synthesized by the virtue of foam and the TiO 2 micro-flower is introduced by spin-coating method. This TiO 2 micro-flower supplies more adsorption sites for CdSe quantum dots, thus leading to the enhanced light harvesting efficiency. The staggered structure between the anatase nanoparticle and the rutile micro-flower will facilitate the separation of electron-hole pairs and promote the injection process of electron. Consequently, the photovoltaic performance of QDSSCs based on the TiO 2 micro-flower modified photoanode is about 43% higher than that of the bare porous TiO 2 photoanode.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Yuanting Wu,JinRong Wang,Bailin Zeng,Mengyao Guan,Lihui Guo
Heterostructures with intimate contact interfaces and well-matched band structure construction are considered to be one the effective methods to promote photogenerated carrier separation and photocatalytic semiconductor activity. Herein, a simple joint post-modification method of hydrochloric acid and dopamine hydrochloride mediated under acidic conditions was proposed. Bi 12 SiO 20 -Bi 2 O 2 SiO 3 -BiOCl curved microflower photocatalyst with double heterojunction and large specific surface area was prepared. Hydrochloric acid and dopamine hydrochloride act as reactants and halogen sources in the composite photocatalyst, and their amount precisely control the surface morphology and the thickness of nanosheets. Benefiting from the synergistic effect of morphology regulation and interface optimization, the DBSO-10 not only changes its morphology from the original bone rod structure to the curved microflower structure with a large specific surface area, but also formes a double type-II heterostructure with tight interface connection. And the new microflower photocatalyst can achieve a degradation rate of 99.7 % in 20 min, which is 40 times higher than that of Bi 12 SiO 20 -Bi 2 O 2 SiO 3 photocatalyst. Notably, the material can also effectively degrade five catalysts including dyes and antibiotics within 1 h.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Zichen Zheng,Kewei Liu,Marc Debliquy,Chao Zhang
Although semiconducting metal oxide displayed remarkable gas sensing capabilities, their path to commercialization is impeded by several challenges. A primary hurdle is the consistent response of sensing films with impervious feature under diverse detection environment. This report introduces an efficient fabrication technique that yields carbon functionalized cladding bismuth tungstate-based benzaldehyde sensors. The 3D twisted micro-flowers feature was obtained and carbon cladding was uniformly attached by a one-pot wet chemistry strategy. The C 0.75 /WO 3 /Bi 2 WO 6 sensor demonstrates superior sensing capabilities for benzaldehyde at a wide range of detection. It features a remarkable sensitivity (33.7 @ 50 ppm), swift recovery time of 49 seconds, enduring stability exceeding 15 days, and robust selectivity , all at a modest room temperature . Even in conditions of high moisture, the response value exhibited minimal degradation, decreasing by a mere 8.96% compared to its performance in the absence of ambient humidity. The complementary density functional theory calculations suggest that the C x /WO 3 /Bi 2 WO 6 exhibits a greater benzaldehyde adsorption energy and more robust anti-humidity feature compared to WO 3 /Bi 2 WO 6 , contributing to its enhanced gas-sensing efficacy.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
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