Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Jing Ren,Jianfeng Li,Zhaozan Xu,Zhiping Du,Fangqin Cheng
As thermo-sensitive hydrogels could absorb water quickly and squeeze the water out by their insoluble cross-linked networks under thermal stimulus, a novel osmotic membrane distillation (OMD) process was proposed for the first time. In the OMD process of this study, water vapor diffused across the membrane under the swelling pressure of thermo-sensitive hydrogels. Poly-N-isopropylacrylamide (PNIPAM) hydrogels with 0.02%, 0.1% and 0.5% N,N′-methylenebisacrylamide (MBA) were synthesized and incorporated into the OMD system. The hydrogel properties were characterized by UV–vis spectrophotometer, FTIR and SEM . The effects of MBA content, membrane characteristics, operating temperature on OMD flux were investigated. The initial fluxes for the 0.02%, 0.1% and 0.5% MBA hydrogel-OMD systems were 1.68, 1.09 and 0.76 kg/m 2 ·h, respectively. And the hydrogels transformed to dehydrated state after 150 min of water absorption. The fastest water absorption rates for PNIPAM hydrogels with 0.02%, 0.1% and 0.5% MBA were obtained at the initial swelling ratios of 16, 14 and 12 folds, respectively. Besides, the optimal feed temperatures for the maximum flux were 40 °C, 50 °C and 50 °C for hydrogels with 0.02%, 0.1% and 0.5% MBA, respectively. The membranes with higher porosity and lower thickness demonstrated higher fluxes. According to our results, the swelling pressure of hydrogel acted as a driving force of the hybrid hydrogel-OMD system, and it was greatly affected by the hydrogel structure. Typically, a hydrogel with the balanced water absorbing and dewatering behaviors and a membrane with good mass transfer performance were two essential prerequisites for this process.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 24
·10399-10411
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IF 3.553
Yang Wangyang,Shen Honglie,Min Huihua,Ge Jiawei
The application of TiO 2 acetone monitor is highly limited by the high operating temperature and poor sensitivity. In this work, black TiO 2 (B-TiO 2 ) is produced by Ti 3+ self-doping and is followed by Ag modification to form B-TiO 2 @Ag. It is first demonstrated that the operating temperature and sensitivity of TiO 2 to acetone can be promoted evidently. By introducing a Ti 3+ self-doped layer on the surface of TiO 2 , as observed in TEM images, the band gap of TiO 2 is reduced to 3.01 eV. Ag surface decoration is carried out for the enhancement of electron generation. Optical absorption and the Hall effect results prove that B-TiO 2 @Ag exhibits highest photoelectrical properties. As a result, the B-TiO 2 @Ag gas sensor with a low operating temperature at 250 °C and high response of 68.19 to 50 ppm acetone is realized. The low detection limit of B-TiO 2 @Ag sensor reaches 887 ppb, which provides an applicable way for non-invasive detection of blood glucose.
研究领域:
材料科学
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传感技术
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生物医学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Bao-Xia Dong,Long-Zheng Wang,Yun-Lei Teng,Zong-Wei Li,Juan Zhao
In this study, the superior effect of RbF on reducing the hydrogen desorption operating temperature of the Li N H system was demonstrated. By doping 5 mol% RbF in the LiNH 2 LiH system, we obtain the lowest hydrogen desorption peak temperature (211 °C) at a heating rate of 5 °C/min, which is approximately 69 °C lower than that of the pristine LiNH 2 LiH system. Moreover, the system starts to desorb H 2 at 120 °C, which is the lowest hydrogen desorption onset temperature. The hydrogen desorption peak and onset temperatures can be further decreased by doping more RbF. It is proposed that the RbH produced during heat treatment improves the dehydrogenation properties of the RbF-doped LiNH 2 LiH sample.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yaodan Zhang,Yuanchao Xie,Hongtao Wang,Dan Han,Shengbo Sang
It is essential to improve the detection response and maintain good stability of the gas sensor to be able to effectively monitor the ppb level harmful NO 2 gas. This work was dedicated to improving the sensing performance of NO 2 gas sensors by synthesizing flower-like structure SnO 2 /GaN composites using a combination of solvothermal and ultrasonic mixing method. The introduction of GaN increased the specific surface area of SnO 2 and provided more adsorption sites. Gas-sensitive test results showed that the SnO 2 /GaN composites exhibited excellent NO 2 response (42–1 ppm of NO 2 ) and lower detection limit (100 ppb) at lower operation temperature of 130 °C. In addition, the fluctuation in the initial resistance and response of the SnO 2 /GaN composites to 20 ppm of NO 2 within one month were small. The improved sensing performance was attributed to the unique flower-like structure of SnO 2 , the excellent thermodynamic stability of GaN and the heterogeneous interface of SnO 2 /GaN. This work provides a new design strategy for the development of highly sensitive ppb-level NO 2 sensors for atmospheric environmental monitoring.
研究领域:
材料科学
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环境科学
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传感器技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 9
·7568-7579
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IF 3.741
Hejing Wen,Zhongsheng Liu,Jia Qiao,Ronghua Chen,Ruijie Zhao,Jianchun Wu,Guanjun Qiao,Jianhong Yang
Summary Aluminum-air battery (AAB) is a very promising energy generator for electric vehicles (EVs) due to its high theoretical capacity and energy density, low cost, earth abundance, environmental benignity and rapid refuel. In this study, the practical energy efficiency and power density of AAB are improved by optimizing its factors, such as anode-cathode distance, operation temperature, electrolyte flow rate and the atmosphere. Under air atmosphere, the peak power density reaches 381 mW cm −2 , and the optimum output power density is 258 mW cm −2 with the anode efficiency of 90.9% and energy efficiency of 44.4%; and under pure O 2 atmosphere, the peak power density is up to 545 mW cm −2 , and the optimum output power density is 430.5 mW cm −2 with the anode efficiency of 94.2% and energy efficiency of 42.6%. These results are promising to constitute a foundation for future development of Al-air battery systems for EVs. Highlights There is rare literature on the influence of ACD and electrolyte flow rate on Al-air battery performances. The optimum parameters for Al-air flow battery are operating at 60°C with parameters of ACD of 0.5 mm, electrolyte flow rate of 15 mL min −1 under pure O 2 atmosphere. Pure O 2 atmosphere can help to keep high energy efficiency at high power density for Al-air flow battery due to the increased oxygen solubility, but slightly reduced anode efficiency. Under pure O 2 atmosphere, the peak power density is up to 545 mW cm −2 , the anode efficiency reaches 96.2%. The optimum output of power density is 430.5 mW cm −2 with the energy efficiency of 42.6%.
研究领域:
能源科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 20
·17533-17541
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IF 2.324
Zeng Xiangan,Wang Zhijun,Li Yu,Li Haiying,Xu Suyang,Liu Li,Gong Yimin,Liang Qingcheng,Duan Haojie,Cheng Yali,Du Liting
Pure In 2 O 3 nanowires (PINW) and CdO–In 2 O 3 composited beaded porous nanotubes (CIBPNT) were successfully prepared by conventional electrospinning method and followed by calcination. The peculiar surface morphological images of as-synthesized nanomaterials were observed via scanning electron microscope (SEM) and transmission electron microscopy (TEM) from which we could observe a series of irregular holes distributed on the surface of beaded nanotubes. The inner structure of the samples was investigated using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results reveal that the element composition of the samples are in conformity with the CdO–In 2 O 3 materials. In addition, the average crystallite size of CIBPNT (17.5 nm) can be estimated from XRD which accords with the TEM images, and XPS analysis supports the oxygen vacancy principle by proving the oxygen vacancies concentration of CIBPNT is more than in PINW. The formaldehyde sensing performances of the samples were evaluated at different temperatures. The result shows that the sensor based on CIBPNT exhibits a excellent response (72–50 ppm formaldehyde) at a low operation temperature of 132 °C, and the value is eight times that of the response of PINW (9 to 50 ppm formaldehyde).The sensor based on CIBPNT could detect 0.1 ppm formaldehyde with a response of 2. In addition, good selectivity and a short response and recovery time (6 s, 12 s) are exhibited. The enhancement of gas sensitivity is attributed to not only the unique beaded shape of hollow and porous 1D nanostructures, but also the high catalytic activity of the CdO additive.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Zhonghang Xia,Han Zheng,Huiming Ji,Yiwen Zhang
H 2 gas sensors with facile preparation, high sensitivity and low detection limits are crucial for hydrogen energy safety. Given the high surface area, abundant porosity and high stability, zeolitic imidazolate frameworks (ZIFs) provide a potential development path for hydrogen sensors. In this work, ZIF-67@ZIF-8 modified with palladium nanoparticles (Pd NPs) was synthesized by room-temperature solution synthesis and NaBH 4 reduction method. The xPd@ZIF-67@ZIF-8 (x=10, 20, 30, 40) samples exhibit a rough mesoporous surface due to etching of NaBH 4 and feature a uniform distribution of Pd NPs. The modification of Pd NPs broadens the hole accumulation layer (HAL) of ZIF-67@ZIF-8 and decreases the resistance (from ~500 to 1 MΩ), thereby reducing the operating temperature. It is noteworthy that the operating temperature zone of 20 Pd@ZIF-67@ZIF-8 is 85-115 ℃ with higher hydrogen sensitivity than the other sensors at optimum operating temperature (≥ 100 ℃). Meanwhile, the 20 Pd@ZIF-67@ZIF-8 sensor demonstrates a rapid response speed to low concentration H 2 (response to 50 ppm H 2 within 8 s) on account of the spillover and catalytic effects of Pd NPs. Furthermore, the 20 Pd@ZIF-67@ZIF-8 sensor possesses a relatively low theoretical detection limit (16.5 ppb), and exhibits excellent moisture resistance, cycle and long-term stability. This sensitive material provides a prospective avenue for hydrogen energy safety monitoring.
研究领域:
材料科学
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传感器技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Silin Tang,Yingzhi Meng,Yongqing Cai,Biaolin Peng,Laijun Liu,Qingqing Ke
Ferroelectric electrocaloric (EC) materials are a pivotal part of sustainable micro-cooling, which complements conventional cooling methods in miniaturized devices. However, the application of EC materials is largely limited by the unsatisfactory room-temperature EC response and narrow operation temperature window. In this work, with careful tuning the composition of BaTiO 3 (BT)-based ceramics through the conventional doping method, enhanced EC properties were achieved in Ba 0.8 Sr 0.2 Zr x (Ti 0.999 Mn 0.001 ) 1- x O 3 (BSZMT) ( x = 0.05, 0.10, 0.15, and 0.20). We especially found that the electrocaloric temperature change ( ΔT ) of > 0.50 K was achieved in a broaden temperature ranging from 20 °C to 95 °C and a peak ΔT value of 1.08 K was achieved at temperature of 70 °C in our BSZMT with x = 0.15. To ascertain the physical mechanism, we employed hybrid characterization methods including XRD , Raman, and dielectric analysis together with Density Functional Theory (DFT) calculation. Our results clearly show that the doped Zr and Mn at B site of BSZMT effectively modulate the microstructure leading to coexistence of different ferroelectric phases and broken long-range ferroelectric order, which subsequently results in the enhanced EC performance and broad operating temperature window.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Zhilin Feng,Hongtao Wang,Yaodan Zhang,Dan Han,Yongqiang Cheng,Aoqun Jian,Shengbo Sang
The development of NO 2 gas sensors with lower operating temperature and good thermal stability is always a challenge to solve. In this work, 2D loose porous ZnO/GaN heterogeneous nanosheets were synthesized by ultrasonic mixing, in which ZnO nanosheets and GaN nanoparticles were prepared by hydrothermal method and solid-state pyrolysis , respectively. BET characterization result showed that the specific surface area of loose porous ZnO nanosheets was 57.24 m 2 /g, and XPS tests proved that the formation of heterogeneous interface between ZnO and GaN can effectively increase the number of negative oxygen ion species on the surface. Noticeably, 15 mol % ZnO/GaN composites (Ga:Zn) exhibited the highest response of 134.5–2 ppm of NO 2 at 125 °C and lower limit of detection of 20 ppb. Furthermore, it showed outstanding selectivity, repeatability and long-term stability. The excellent gas-sensing properties can be attributed to the loose porous structure of ZnO and the formation of n-n heterojunction between ZnO and GaN. The gas-sensing mechanism of ZnO/GaN composites to NO 2 was also discussed in detail.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Silin Tang,Changmeng Huan,Xiaoyu Zhou,Zihan Lu,Yingzhi Meng,Laijun Liu,Qingqing Ke
Ferroelectric electrocaloric (EC) materials are crucial for sustainable micro-cooling in miniaturized devices. However, the application of EC materials is largely limited by the unsatisfactory room-temperature EC response and narrow operation temperature window. In this work, interestingly, microstructures of Ba 0.75 Sr 0.25 TiO 3 based ceramics can be tailored by optimized forming methods, such as uniaxial pressing (UP), cold isostatic pressing (CIP), and CIP combined with oxygen annealing (CIP@O 2 ). With the delicate modifications, the electrocaloric temperature change ( ΔT ) of > 0.50 K was achieved in a broaden temperature ranging from 15 °C to 100 °C. Moreover, a peak ΔT value of 1.30 K was obtained at temperature of 70 °C in Ba 0.75 Sr 0.25 Zr x (Mn 0.001 Ti 0.999 ) 1- x O 3 (BSZMT) with x = 0.05 (CIP@O 2 ). The CIP@O 2 method can effectively modulate the phase fraction of BSZMT with an orthorhombic-tetragonal phase coexistence and dynamic polar nanoregions. Therefore, the EC performance and wide operating temperature range are obtained in lead-free ferroelectric ceramics.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
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2023
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IF 13.1
Taizhong Zhu,Danyi Zhu,Jiazhen Liang,Liang Zhang,Fei Huang,Lixin Xue
High-temperature proton exchange membrane fuel cells (HT-PEMFC) possess distinct technical advantages of high output power, simplified water/heat management, increased tolerance to fuel impurities and diverse fuel sources, within the temperature range of 120–200 °C. However, for practical automobile applications, it was crucial to broaden their low-temperature operating window and enable cold start-up capability. Herein, gel-state phosphoric acid (PA) doped sulfonated polybenzimidazole (PBI) proton exchange membranes (PEMs) were designed and synthesized via PPA sol-gel process and in-situ sultone ring-opening reactions with various proton transport pathways based on absorbed PA, flexible alkyl chain connected sulfonic acid groups and imidazole sites. The effects of flexible alkyl sulfonic acid side chain length and content on PA doping level, proton conductivity, and membrane stability under different temperature and relative humidity (RH) were thoroughly investigated. The prepared gel-state membranes contained a self-assembled lamellar and porous structure that facilitated the absorption of a large amount of PA with rapid proton transporting mechanisms. At room temperature, the optimized membrane exhibited a proton conductivity of 0.069 S cm −1 , which was further increased to 0.162 and 0.358 S cm −1 at 80 and 200 °C, respectively, without additional humidification. The most significant contribution of this work was demonstrating the feasibility of gel-state sulfonated PBI membranes in expanding HT-PEMFC application opportunities over a wider operating range of 25 to 240 °C.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2018
·Vol. 26
·期 2
·173-181
·
IF 1.767
Ren Xuechao,Shen Chunhui,Gao Shanjun,Yuan Yuan,Chen Jiqin
A novel proton exchange membrane which can be applied in the range of 25-140°C is prepared by incorporating phosphonic acid functionalized crosslinked siloxane in sulfonated poly(ether ether ketone) matrix from amino trimethylene phosphonic acid (ATMP), epoxycyclohexylethyltrimethoxysilane (EHTMS), and sulfonated poly(ether ether ketone) (SPEEK). EHTMS is introduced to chemically fix free ATMP as well as a cross-linker. And, the obtained membranes are immersed in deionized water to remove free ATMP. Fourier transform infrared and X-ray diffraction patterns suggest that ATMP is anchored into EHTMS and Si-O-Si network forms successfully. These membranes are thermally stable up to 220 °C and exhibit excellent dimensional stability and mechanical performance. The addition of ATMP not only increases the amount of proton transfer sites, but also provides proton transport units for membranes at elevated temperature and low relative humidity (RH) condition. The proton conductivity of AES-4 membrane reaches 0.114S cm -1 at 80 °C and 100%RH and 0.056 Scm -1 at 140 °C and 20%RH, respectively.
研究领域:
高分子化学
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电化学
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能源材料
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膜科学
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燃料电池
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）