CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Q.B. Chen,B. Meng,M.Y. Zhao,H. Xie,L.F. Bian,X. Yang
In order to investigate the grain size effect on the electrical conductivity of the submicron samarium-heavily-doped ceria , the Ce 0.8 Sm 0.2 O 1.9 (SDC20) ceramics with grain sizes from 128 nm to 533 nm were prepared by sintering at 1000–1300 °C in the air atmosphere. The crystalline structure, micro-morphology, density and electrical conductivity of the SDC20 ceramics were measured and characterized by XRD , SEM, TEM, Archimedes method and electrochemical impedance spectrum, respectively. All the sintered samples show the single SDC phase, low porosity and clean grain boundary without any impurities. The grain sizes of SDC ceramics grow continuously with the rising sintering temperature , and the relative densities increase as the sintering temperature rises from 1000 °C to 1200 °C and then decrease with the temperature from 1200 °C to 1300 °C. The specific grain boundary conductivity of SDC keeps decreasing while the grain and apparent grain boundary conductivities increase during the whole grain size range of 128–533 nm.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 2
·686-696
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IF 2.787
Qingqing Yang,Bin Meng,Zuoliang Lin,Xinkun Zhu,Feng Yang,Shan Wu
To further enhance the electrical conductivity of doped ceria, the samarium-doped ceria (SDC)/Al 2 O 3 nanocomposites were prepared through sintering the coprecipitated powders in 1100°C-1300°C. The grain sizes of all composites are less than 100 nm and decrease with alumina addition. Besides the main phases of SDC and Al 2 O 3 , the SmAlO 3 can precipitate in the composites if sintered at higher temperatures or for longer dwell time. The deviations of SDC diffraction peak positions demonstrate the solid solution of alumina into SDC lattice. The total electrical conductivities of the composites increase with alumina content until 30% alumina is added. The SDC/30%Al 2 O 3 presents the higher total conductivity than the pure SDC by about five times. Specifically, the grain interior conductivity generally decreases with the alumina addition while the grain-boundary conductivity increases with that. The introduction of the conductive SDC/Al 2 O 3 interface can contribute to the rise of total conductivity, yet the excessive alumina addition also blocks the oxygen ion conduction. The SmAlO 3 precipitation is detrimental to the ion conduction for it consumes part of alumina and leads to the decrement in Sm concentration of SDC grain. Appropriate alumina addition not only enhances the conductivity of SDC but also lowers the material cost.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Li Liu,Qianqian Wei,Yeqing Lan,Cheng Chen
Efficient purification of the wastewater containing organoarsenic by activated peroxymonosulfate (PMS) usually faces with a great challenge because the degradation of organoarsenic is coupled with the release of its byproduct As(V). Heterogeneous catalysts with catalytic and adsorption functions show great potential in activating PMS for the degradation of organoarsenic and the removal of secondary inorganic arsenic. In this study, Co-CeMnO was designed and fabricated to realize simultaneous elimination of p -arsanilic ( p -ASA) and As(V) in Co-CeMnO (0.2 g/L)/PMS (0.25 mM) system, in which 50 µM p -ASA was almost completely degraded within 5 min and approximately 100% of the produced As(V) was removed within 30 min. The rate constant of the pseudo-first-order kinetics for the p -ASA degradation by PMS mediated with Co-CeMnO was high up to 0.65 min −1 , approximately 6.5 times higher than that in the system of CeMnO/PMS. It was revealed that SO 4 •− , • OH and 1 O 2 acted as the main oxidant species responsible for the oxidation of organics and As(III), and the surface −OH of Co-CeMnO led to the adsorption of As(V) via ion exchange. The excellent reusability and stability of Co-CeMnO was verified by five cycles with high removal efficiencies of p -ASA (>92% within 10 min) and arsenic (>98% within 90 min) and low leached metal ion concentrations (Co ions < 0.27 mg/L; Mn ions < 0.15 mg/L; Ce ions ≈ 0). Under the condition of initial pH 5, p -ASA was degraded completely and over 98% of total arsenic was adsorbed in different water matrices, indicating the practical application potential of Co-CeMnO/PMS system. Thus, the present study provided a reliable PMS activation strategy by constructing bifunctional catalysts to achieve satisfactory treatment of the wastewater containing p -ASA.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Lei Hu,Junkai Hao,Ruhui Shang,Huitian Zhi,Xujie Wang,Yingchao Yang,Hanning Song,Chenxi Li,Juan Yu,Zhengquan Yan
Background Environmental safety and protection is accordingly one of the hottest issues to be concerned nowadays. Among all the chemicals to be monitored urgently, aminophenol and luminol are both quite hazardous but widely utilized in the fields of chemical industry, medicine, scientific research, chemical sensing, and so on. Although some reported ways could detect them satisfactorily, few reports could be found for portable visual monitoring and degradation of aminophenol and luminol, using only one sensor to judge the degradation degree as well. Results Fe-doped-Ce oxide modified chitosan fiber (Fe–Ce ox@CF) was developed by microwave-assisted hydrothermal method. By virtue of the excellent physical and chemical performance of carboxylated chitosan and its synergistic effect, Fe–Ce ox@CF possessed prominent oxidase-mimic activity to catalyze over 94 % luminescent luminol into dicarboxylic acid at room temperature. When utilized to accelerate the oxidization of ABTS, K m / V max were 0.0403 mM/2.327 × 10 −8 M s −1 . Especially, ultra-trace m -aminophenol ( m -AP) could exclusively alter the color of Fe–Ce ox@CF-ABTS from green to purple-red with remarkable visibility. Under the optimized conditions, there exhibited an excellent ratiometric colorimetric linear relationship between lg( A 515 / A 730 )/lg( A 515 / A 415 ) and c m -AP , and a fluorescent one between ΔF 427 and c luminol with detection limits (LOD) of 2.0 × 10 −9 M and 5.6 × 10 −9 M respectively. Especially, the red-green-blue (RGB) values got by a common smartphone also possessed good linear relationships with LODs of 1.7 × 10 −8 M and 1.34 × 10 −8 M. Significance This work represents the first oxidase-mimic based sensing system for potable and quantitative degradation of luminol and visual detection of m -aminophenol as well with the help of smartphones. It will also shed promising light on modified natural carbohydrate polymer-based sensors by non-destructive self-assembly and further application in practices.
研究领域:
环境安全
·
化学传感
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Hao Wu,Jie Xiao,Xiaoyuan Zeng,Xue Li,Jing Yang,Yuling Zou,Sudongfang Liu,Peng Dong,Yingjie Zhang,Jiang Liu
Direct carbon solid oxide fuel cells (DC-SOFCs) are promising, all-solid-state, highly efficient and environment-friendly power generating devices fueled by solid carbons. In addition, utilization of real-world coal as fuel for DC-SOFC is an attractive topic, however, they still yield poor performance due to negative effect of impurities in coal. In order to utilize brown coal to generate electricity efficiently and environmentally, here we report a high-performance direct carbon solid oxide fuel cell that enables a green pathway for brown coal utilization. The cell consists of nano Al 2 O 3 doped yttria-stabilized zirconia (YSZ) electrolyte supports and Ag-Gd 0.1 Ce 0.9 O 2-δ as symmetrical composite catalyst electrodes. Fueled with raw brown coal and brown coal char at 850 °C separately, the cells can achieve maximum power densities of 211.4 and 221 mW cm −2 , respectively. Furthermore, a stable discharging voltage and platform with the fuel utilization of 61.5% are demonstrated when brown coal char fueled DC-SOFC is operated under a constant current of 0.1 A.
研究领域:
能源科学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Runze Wang,Tengpeng Wang,Fangsheng Liu,Yuyao Ma,Tao Wei,Dehua Dong
Carbon-assisted solid oxide electrolysis cell (CA-SOEC) presents a promising solution for water electrolysis with reduced energy consumption and enhanced efficiency of hydrogen production. However, one key issue in optimizing CA-SOEC performance is the inefficient mass transfer at the anode layer, particularly in improving the CO–CO 2 shuttle mechanism. To address this issue, this study designs a dendritic channel anode for CA-SOEC, which significantly enhances the CO–CO 2 shuttle, realizing improved mass transfer and reduced polarization resistance. Further, an additional Pd/GDC-Ni nano-catalyst layer was incorporated at the electrode-electrolyte interface, which greatly improved the efficiency and stability of anode layer for long-term electrolysis process, presenting a current density of 1.41 A cm −2 under a low voltage of 1.0 V. This research will help to provide new ideas and technical support for the design of highly efficient and environmentally friendly anode layer of CA-SOEC for water electrolysis.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）