INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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2025
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IF 5.8
Baitong Wang,Mingshang Liu,Zide Wu,Xun Liu,Mu Li,Dawei Tang
Solid oxide fuel cell (SOFC) has captured significant interest and the electrolyte material is the key during operating. The present work introduces a series of intermediate temperature perovskite materials regarding of synthesis and characterization method. Corresponding thermophysical properties including thermal diffusivity, specific heat and thermal conductivity were determined at relevant temperature range. The result shows that thermal diffusivity has a stable tendency for the intermediate temperature electrolytes materials; Ba 3 NbMoO 8.5 has the highest specific heat and BaSc 0.8 MoNb 0.2 O 2.8 has the highest thermal conductivity at 873 K. Besides, a 3-D model is established including transient state and steady state. After combining intermediate temperature electrolyte materials with different thermophysical properties, it is found that the maximum temperature gradient and thermal shock exist at switching time ( t = 600 s) and the tendency are controversial for each other. Besides, after comparing different supported structure of SOFC, a systematic selection strategy is provided for IT-SOFC application. Cathode-supported structure SOFC is an ideal choice for long term usage, which has a low temperature gradient; whereas electrolyte-supported structure with Na 0.5 Bi 0.5 TiO 3 electrolyte is beneficial to quick start-up system, which has the lowest thermal shock.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Food Bioscience
·
2017
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IF 1.964
Zicong Zeng,Shunjing Luo,Chengmei Liu,Xiuting Hu,Ersheng Gong,Jinyu Miao
Based on the results of phenolic retention of brown rice treated by extrusion with thermostable α-amylase (ETA), this work investigated the phenolic retention of brown rice after extrusion with mesophilic α-amylase (EMA). Similarly, EMA significantly increased phenolic retention of brown rice with the increasing enzyme level, and the phenolic retention was positively correlated with reducing sugars. However, brown rice treated by EMA had higher retention rate of free phenolic content, free antioxidant activity , and total identified free phenolic acids than that treated by ETA at different enzyme levels, although the corresponding reducing sugars produced by EMA were lower than by ETA. These results indicated that the extrusion temperature had greater effect on the phenolic retention than enzymatic hydrolysis during enzymatic extrusion. In addition, brown rice treated by EMA with 0.5% enzyme had a high retention of free flavonoids at 72.4%. Therefore, EMA might be a better processing technology for brown rice to improve its nutrition .
研究领域:
食品科学
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营养学
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DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 8
·2270-2279
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IF 3.186
Bie Xuan,Jiao Kunling,Gong Chunqin,Qu Baozhong,Liu Daokuan,Ma Shuangchen
To develop highly efficient NH 3 -SCR catalysts with a wide temperature range, catalysts based on MnAlO x and Cerium elements loading with various mixing ratios were prepared for selective catalytic reduction of NO by NH 3 . The special role of cerium was demonstrated by the surface structure characteristics and unique catalytic performance, involving the surface-active sites and compositions analysis. Interestingly, the strengthening of Mn 1.2 Al 0.8 Ce a O x on both acid sites, especially medium acids and strong acids, were clearly manifested. Meanwhile, the strong interaction between MnAlOx and CeO 2 enabled favorable electron transfers from MnOx to CeO 2 while generating more oxygen vacancies and active oxygen species, consequently accelerating the redox cycle. The results illustrate that the NOx conversion and the selectivity of N 2 can be improved with more medium acids tuned by appropriate Ce adding. However, an opposite effect will appear by excessive addition. In addition, the reaction mechanisms at different acid sites are revealed. Our findings, therefore, provide a strategy for the rational design of moderate-temperature NH 3 -SCR catalysts through adding-induced component engineering of composite materials. Graphic Abstract Mn 1.2 Al 0.8 Ce a O x Catalysts with different surface features were fabricated by an environment-friendly method. The strong interaction between MnAlOx and CeO 2 was systematically illustrated. Meanwhile, the importance of medium acids was convincingly revealed. And the reaction mechanisms at different acid sites were demonstrated. These provide a strategy for the rational design of moderate-temperature NH 3 -SCR catalysts through adding-induced component engineering of composite materials.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Sheng-Bing Yang,Jun-Jie Fu,Jia-Huan He,Xiao-Juan Zhang,Li-Juan Chai,Jin-Song Shi,Song-Tao Wang,Su-Yi Zhang,Cai-Hong Shen,Zhen-Ming Lu,Zheng-Hong Xu
Qu -aroma is of great significance for evaluation the quality of Daqu starter. This study aimed to decode the Qu -aroma of medium-temperature Daqu (MT- Daqu ) via “top-down” and “bottom-up” approaches. Firstly, 52 aroma descriptors were defined to describe the MT- Daqu aroma by quantitative descriptive analysis . Secondly, 193 volatile organic compounds (VOCs) were identified from 42 MT- Daqu samples by HS-SPME-GC–MS, and 43 dominant VOCs were screened out by frequence of occurrence or abundance. By Thin Film (TF)-SPME-GC-O-MS, 27 odors and 90 VOCs were detected in MT- Daqu mixture, and 14 odor-active VOCs were screened out by odor intensity. Thirdly, a five-level MT- Daqu aroma wheel was constructed by matching 52 aroma descriptors and 37 aroma-active VOCs. Finally, Qu -aroma of MT- Daqu was reconstructed with 37 aroma-active VOCs and evaluated by omission experiments. Hereinto, 26 key aroma-active VOCs were determined by OAV value ≥1, including isovaleric acid, 1-hexanol, isovaleraldehyde, 2-octanone, trimethylpyrazine, γ-nonalactone, 4-vinylguaiacol, etc.
研究领域:
食品科学
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微生物学
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化学
✓ 已验证
DOI
PubMed
高影响因子
Green Energy & Environment
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2020
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IF 6.395
Yu Qiu,Li Ma,Qingfeng Kong,Min Li,Dongxu Cui,Shuai Zhang,Dewang Zeng,Rui Xiao
Operating chemical looping process at mid-temperatures (550–750 °C) presents exciting potential for the stable production of hydrogen. However, the reactivity of oxygen carriers is compromised by the detrimental effect of the relatively low temperatures on the redox kinetics. Although the reactivity at mid-temperature can be improved by the addition of noble metals, the high cost of these noble metal containing materials significantly hindered their scalable applications. In the current work, we propose to incorporate earth-abundant metals into the iron-based spinel for hydrogen production in a chemical looping scheme at mid-temperatures. Mn 0.2 Co 0.4 Fe 2.4 O 4 shows a high hydrogen production performance at the average rate of ∼0.62 mmol g −1 min −1 and a hydrogen yield of ∼9.29 mmol g −1 with satisfactory stability over 20 cycles at 550 °C. The mechanism studies manifest that the enhanced hydrogen production performance is a result of the improved oxygen-ion conductivity to enhance reduction reaction and high reactivity of reduced samples with steam. The performance of the oxygen carriers in this work is comparable to those noble-metal containing materials, enabling their potential for industrial applications.
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
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Qiang Xie,Yifan Li,Jing Hu,Xiaojing Chen,Haibin Li
Solid acids are considered as a promising electrolyte for intermediate temperature fuel cells (ITFCs), but their application is hindered by their inherent shortcomings, including poor mechanical properties , limited chemical stability, low proton conductivity at low temperature and narrow high-conductivity temperature range. Despite much work devoted to addressing these shortcomings, none of them can tackle these issues simultaneously. In view of this, we reported a composite electrolyte membrane based on CsH 2 PO 4 , sulfonated poly(ether ether ketone) and phosphosilicate sol. The electrolyte membrane was fabricated by using a simple sol–gel process combined with mechanical ball-milling. The prepared electrolyte membrane exhibits excellent mechanical performance with a tensile strength of 23.5 MPa, despite an inorganics content of 70 wt%. The electrolyte membrane can keep intact even if it is heated to 260 °C. The measurement of proton conductivity shows that the electrolyte membrane can maintain a high conductivity of above 10 −3 S cm −1 over a broad temperature range of 130–230 °C under ambient condition without humidifying. The successful fabrication of the electrolyte membrane not only provides a promising membrane for ITFCs, but also opens fresh insights for the development of electrolytes with superior comprehensive performance and the application of solid acids in ITFCs.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2022
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IF 5.545
Liang Qingwen,Tang Ping,Zhou Jing,Bai Jinghe,Tian Dan,Zhu Xiaofei,Zhou Defeng,Wang Ning,Yan Wenfu
Solid state electrolytes have been intensively studied in the solid oxide fuel cells (SOFCs). The aim of this work is to investigate the effects of MgO and Fe2O3 dual sintering aids on the microstructure and electrochemical properties of solid state Gd0.2Ce0.8O2-δ (GDC) electrolytes, which are prepared by a sol-gel method with MgO and Fe2O3 addition to the GDC system. It is found that the addition of MgO and Fe2O3 can reduce the sintering temperature, increase densification and decrease the grain boundary resistance of the electrolyte. The 2 mol% MgO and 2 mol% Fe2O3 co-doped GDC (GDC-MF) exhibits the highest grain boundary conductivity. At 400°C, the grain boundary conductivity and total conductivity of GDC-MF are 15.89 times and 5.56 times higher than those of GDC. The oxygen reduction reaction (ORR) rate at the electrolyte/cathode interface of GDC-MF is 47 % higher than that of GDC. Furthermore, the peak power density of a single cell supported by GDC-MF is 0.45 W cm−2 at 700°C, 36.7% higher than that of GDC. Therefore, the GDC-MF should be a promising electrolyte material for intermediate-temperature solid oxide fuel cells (IT-SOFCs).
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2019
·
IF 2.886
Hengxu Song,Yuhong Zhao,Yongqiang Niu,Hua Hou
Medium-temperature molten salt reserve primary cell utilizes low-melting nitrate electrolyte, that is considered suitable for geothermal borehole as well as oil and gas exploration . In this work, Cr 3+ and F − ions were introduced into spinel lithium manganate oxides by high-temperature solid-state method and verified by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The effects of fluorine content on the morphology and discharge performance of the LiCr 0.1 Mn 1.9 O 4− x F x (0 ≤ x ≤ 0.5) have been studied in LiCr 0.1 Mn 1.9 O 4− x F x /LiNO 3 -KNO 3 -Ca(NO 3 ) 2 /Li-Mg-B system. Fluoride-doped samples have a significant improvement in discharge performance at the condition of 10 mA·cm −2 and 250 °C because of the stabilization of the crystal structure. Factors of operating temperature and current density have a significant effect on battery discharge performance, and the surroundings of 10 mA·cm −2 and 200–250 °C contributes the battery to achieve high performance. That indicates the LiCr 0.1 Mn 1.9 O 4− x F x /LiNO 3 -KNO 3 -Ca(NO 3 ) 2 /Li-Mg-B battery shows great potential in geothermal borehole as well as oil and gas exploration environment.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Xinyu Feng,Hanzhen Liu,Zhenhang Lu,Xuanyu Lin,Xin Tang
The advancement of novel heterostructure electrolytes and the enhancement of solid oxide fuel cell (SOFC) performance represent a promising strategy for developing medium-temperature SOFCs. This study focuses on synthesizing CaSnO 3 via the sol-gel technique and fabricating CaSnO 3 -ZnO composites to serve as electrolytes for medium-temperature SOFCs. At 550 °C, the 2Ca 8Zn composite demonstrated an ionic conductivity of 0.204 S cm −1 , a peak power density of 700 mW cm −2 , and intermittent durability lasting up to 24 h under identical thermal conditions. Upon further investigation of the energy band structure, it has been revealed that CaSnO 3 -ZnO composites are promising candidates for serving as electrolytes in medium-temperature SOFCs. The findings indicate that the combination of calcium and zinc oxides can form n-n heterojunctions within the material, which enhance ionic conductivity by creating space charge regions, while simultaneously suppressing electronic conductivity. Consequently, CaSnO 3 -ZnO nanocomposites are anticipated to pave the way for advancements in intermediate-temperature solid oxide fuel cells.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Miaolin Lv,Lunjing Yan,Huifang Niu,Cen Li,Meijun Wang,Jiao Kong,Weiren Bao,Jiancheng Wang,Liping Chang
In this paper, the transformation characteristics of coal tar asphalt with different structures (Medium-temperature asphalt (MCTP), High-temperature asphalt (HCTP), Coal liquefaction asphalt (CLP), and Refined asphalt (RCTP)) in the mesophase state were investigated, and the electrochemical performance of mesophase asphalt-based porous carbon was analyzed. The results show that the mesophase asphalt has a higher aromatic carbon ratio and lower aliphatic carbon ratio than the raw asphalt. CLP has the lowest aromaticity (f ar = 68.25 %), which is easy to condense but weak in reactivity. Although the aromaticity of MCTP is higher than that of CLP, its light component content is high and difficult to condense. Therefore, MCTP mesophase asphalt (MCTP-MP) has a larger interlayer spacing than CLP mesophase asphalt (CLP-MP). HCTP has abundant solid carbon and aromaticity, and the carbon layer structure of HCTP mesophase asphalt (HCTP-MP) tends to be more disordered (I D /I G = 0.6). RCTP has better condensation degree and suitable lightweight components (9.75 %) than other asphalts. This makes RCTP mesophase asphalt (RCTP-MP) have higher graphitization degree (I D /I G = 0.31) and good reactivity, and its derived porous carbon (RCTP-MPH) layer structure is efficiently stacked, which is more conducive to charge transport. The specific capacitance of RCTP-MPH is as high as 331F/g (0.5 A/g), and the power density of the RCTP-MPH electrode material is as high as 31.43 Wh/kg at a power density of 198.13 W/kg. After 10,000 cycles (5 A/g), the coulombic efficiency of the RCTP-MPH electrode material can reach 92.99 %.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Chaoran Zhou,Zhixian Liang,Hao Qiu,Shanshan Jiang,Wei Wang,Chao Su
Solid oxide fuel cells (SOFCs) as highly effective energy conversation devices have gained substantial recognition and research interest. The electrochemical properties of the traditional SOFCs are restricted by the sluggish reaction kinetics for the cathode material when lowering the operation temperature to below 600°C. In addition, the stability of the cathode at reduced temperatures is also a big challenge for the widely popularization of SOFC technology. Achieving high activities and stable ORR in the cathode is crucial for the development of SOFCs. The doping active metal method has been demonstrated as an effective approach to optimize the phase structure and improve the ORR activity of the cathode. Herein, we successfully develop an Ir-doped SrCoO 3 − δ (SrCo 0.98 Ir 0.02 O 3 − δ , SCI) cathode for SOFCs. SCI exhibits a low area-specific resistance (ASR) of 0.057 Ω cm 2 at 650°C, ~ 44% lower than 0.102 Ω cm 2 of Ir-free SrCoO 3 − δ . The Ni–Sm 0.2 Ce 0.8 O 1.90 (SDC) anode-supported fuel cell with SDC electrolyte and SCI cathode obtains an excellent output performance (e.g., 1,128 mW cm −2 at 650°C). The desired results underscore the feasibility of the Ir-doping strategy as an optimized method for the exploitation of advancing cathode in SOFCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Wenqian Zhao,Xiaodong Zhang,Yanpeng Cai,Shan Zhao,Shuguang Wang
Metronidazole (MNZ), an antibiotic that is specifically used for the treatment of anaerobic infections, may inhibit anaerobic fermentation. This work was designed to understand the fate and effects of MNZ in mesophilic fermentation (MF) and thermophilic fermentation (TF), respectively. The results showed that the removal of MNZ mainly occurred via biodegradation, rather than adsorption, and that MNZ could be completely degraded by opening the imidazole ring. MFs were more strongly inhibited by MNZ than TFs. MNZ concentration increased from 0 to 25 mg/L, hydrogen yield (HY) decreased from 167.5 to 16.8 mL/g glucose (90.0% decrease), and butyrate yield almost completely disappeared in MFs, whereas in TFs, HY decreased only from 101.1 to 89.3 mL/g glucose (11.7% decrease), and ethanol yield increased by 39.8%. Illumina MiSeq sequencing analysis showed that MNZ reduced the abundance of hydrogen-producing bacteria. Furthermore, the inhibition of MNZ on anaerobic fermentation was reversible.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）