INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xingxing Li,Yan Zhu,Nan Zhang,Yansheng Gong,Rui Wang,Huanwen Wang,Jun Jin,Ling Zhao,Beibei He
The development of symmetrical solid oxide fuel cells (SSOFCs) faces a significant challenge in designing electrode materials that exhibit both high activity and stability. In this work, a novel layered perovskite oxide symmetric electrode material PrBaFe 1.8 Hf 0.2 O 5+δ (PBFH) for SSOFCs is proposed and synthesized. Doping Hf at the B-site of PrBaFe 2 O 5+δ (PBF) improves the stability in reducing atmosphere and increases the concentration of oxygen vacancies . Furthermore, a small amount of RuO x is deposited by atomic layer deposition (ALD) onto PrBaFe 1.8 Hf 0.2 O 5+δ scaffold as symmetric electrodes. The surface modification of ALD-RuO x significantly boosts the catalytic activity for both fuel oxidation and oxygen reduction, simultaneously. Compared to PBF electrodes, the interfacial polarization resistances of RuO x -PBFH decrease to 0.77 Ω cm 2 under H 2 /Ar and 0.021 Ω cm 2 under air atmosphere at 800 °C, respectively. At 800 °C, SSOFCs equipped with RuO x -PBFH symmetric electrodes exhibit a high peak power density of 0.85 W cm −2 and 0.41 W cm −2 using humidified hydrogen and propane as fuels, respectively. Moreover, the RuO x -PBFH electrode demonstrates long-lasting performance, displaying high resistance against coking. These findings reveal a facile ALD approach for tailoring symmetric perovskite electrodes, offering robust and efficient electrocatalysis with efficient noble metal utilization.
研究领域:
材料科学
·
电化学
·
能源材料
·
固体离子学
·
催化化学
·
功能陶瓷
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 6
·2569-2582
·
IF 3.3
Shen Wentong,Zhou Liang,Liu Yongdi,Zhang Jinlong,Lei Juying
Roxarsone (ROX), a feed additive widely used worldwide, was degraded into toxic products in the natural environment. Advanced oxidation processes (AOP) based on nonradicals used for the degradation of ROX had not been reported. Herein, resorcinol–formaldehyde resins (RFs) produced by a simple high-temperature hydrothermal method had efficient photocatalytic properties to produce H 2 O 2 . FeOOH quantum dots (QDs) act as the activator and electron shuttle to decompose H 2 O 2 to produce 1 O 2 . RFs decorated with FeOOH quantum dots (RFs-Fe QDs ) were successfully synthesized and completely remove ROX with a rate of 0.03649 min −1 under simulated sunlight. Otherwise, the 99.42% arsenic-containing portion that shed from Roxarsone was eventually converted to As(V) and in-situ adsorbed by FeOOH quantum dots. The experiment data showed that ·OH, O 2 ·− and 1 O 2 participated in the degradation and 1 O 2 was the dominant reactive species. Moreover, the systems have excellent reusability and stability over a wide pH range. This study provided a new strategy for photocatalytic production of 1 O 2 to remove the ROX from water.
研究领域:
环境科学
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纳米技术
·
催化
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水处理
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinyu Ping,Qingqing Yang,Bin Meng,Zhiyuan Ma,Xiaoyu Pan
Four kinds of high-entropy oxides (HEOs) with compositions of Y 0.2 Zr 0.2 Hf 0.2 Ce 0.2 X 0.2 O 2−δ (X = La, Nd, Gd, Dy, abbreviated as HEO-La, Nd, Gd, Dy, respectively) are synthesized by solid-state-reaction method combined with conventional sintering in air atmosphere at 1600 °C for 10 h. These HEOs have a fluorite-structured phase with homogeneous element distribution. The thermal conductivity ( κ ) of these four samples is in 1.68–2.18 W m −1 K −1 in 25–900 °C. At 800 °C and 900 °C, the κ value of HEO-Gd is lower than those of the HEO-La, Nd, Dy, yttria-stabilized zirconia (YSZ) and some other HEOs with various crystal structures ((Gd 0.2 Dy 0.2 Ho 0.2 Er 0.2 Tm 0.2 )Ta 3 O 9 , (La 0.25 Eu 0.25 Gd 0.25 Yb 0.25 ) 2 Zr 2 O 7 , (Sm 0.2 Dy 0.2 Ho 0.2 Er 0.2 Yb 0.2 )NbO 4 , Hf 0.25 Zr 0.25 Ce 0.25 Gd 0.125 Ca 0.125 O 2-δ and Sr(Y 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 ). The sample of HEO-Gd has the highest thermal expansion coefficient (CTE) (12.1 × 10 −6 K −1 ) and fracture toughness ( K IC ) (2.5 MPa m 1/2 ) among HEO-La, Nd, Gd, Dy. Its K IC value is higher than those of other HEOs mentioned above. In addition, HEO-Gd exhibits a better oxygen barrier property compared with YSZ in 450–700 °C. These results indicate that HEO-Gd is a promising candidate as high-temperature thermal insulation ceramic.
研究领域:
材料科学
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无机非金属材料
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高温陶瓷
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热障涂层
·
固态离子学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Ao Wang,Gang Li,Cheng Li,Yujie Tang,Dong Yan,Jian Li,Lichao Jia
Using solid oxide cells to produce and utilize hydrogen is an effective method for addressing energy demands. In this study, vanadium (V) was doped into the B site of the La 0.3 Sr 1.7 Fe 1.3 Ni 0.2 Mo 0.5 O 6-δ double perovskite, which served as the electrode material for symmetrical solid oxide cells. Doping with high-valence V 4+ /V 5+ reduced both the average Fe valence state and the concentration of oxygen vacancies, while simultaneously decreasing the reducing activity of the material and enhancing its stability. After operating at 750 °C and ± 400 mA cm −2 for 150 h, the degradation rates for Cell-LSFNM were 4.56 % and 8.32 %, respectively, while those for Cell-LSFVNM were only 0 % and 3.32 %, respectively. Although V doping slightly diminished the electrochemical performance of the single cell, it significantly improved long-term operational stability in solid oxide fuel/electrolysis cell (SOFC/SOEC) modes.
研究领域:
材料科学
·
电化学
·
能源材料
·
固体氧化物电池
·
功能陶瓷
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Ying Wang,Li Wang,Ning Gan,Zi-Yian Lim,Chunzheng Wu,Jun Peng,Wei Guo Wang
Ni/ x Y 2 O 3 –Al 2 O 3 ( x = 5, 10, 15, 20 wt%) catalysts were prepared by sequential impregnation synthesis. The catalytic performance for the autothermal reforming of methane was evaluated and compared with Ni/γ-Al 2 O 3 catalyst. The physicochemical properties of catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), X-Ray Photoelectron Spectrometer (XPS), Thermo Gravimetric Analyzer (TGA) and H 2 -temperature programmed reduction techniques (TPR). The decrease of nickel particle size and the change of reducibility were found with Y modification. The CH 4 conversion increased with elevating levels of Y 2 O 3 from 5% to 10%, then decreased with Y content from 10% to 20%. Ni/ x Y 2 O 3 –Al 2 O 3 catalysts maintained high activity after 24 h on stream, while Ni/Al 2 O 3 had a significant deactivation. The characterization of spent catalysts indicated that the addition of Y retarded Ni sintering and decreased the amount of coke.
研究领域:
催化化学
·
能源材料
·
化学工程
·
无机功能材料
·
工业催化
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Xufei Shao,Xiaotong Li,Jinzhu Ma,Runduo Zhang,Hong He
Ozone is a poisonous gas, so it is necessary to remove excessive ozone in the environment. Catalytic decomposition is an effective way to remove ozone at room temperature. In this work, 10%Ag/nano-Al2O3 and 10%Ag/AlOOH-900 catalysts were synthesized by the impregnation method. The 10%Ag/nano-Al2O3 catalyst showed 89% ozone conversion for 40 ppm O3 for 6 h under a space velocity of 840 000 h–1 and a relative humidity of 65%, which is superior to 10%Ag/AlOOH-900 (45% conversion). The characterization results showed Ag nanoparticles to be the active sites for ozone decomposition, which were more highly dispersed on nano-Al2O3 as a result of the greater density of terminal hydroxyl groups. The understanding of the dispersion and valence of silver species gained in this study will be beneficial to the design of more efficient supported silver catalysts for ozone decomposition in the future.
研究领域:
环境催化
·
材料化学
·
纳米催化
·
大气污染控制
·
表面化学
✓ 已验证
DOI
高影响因子
Microstructures
·
2022
·Vol. 2
·期 3
·N
·
IF 0
Xueting Wang,Yunchuang Wang,Meichao Wu,Ruopian Fang,Xi Yang,Da-Wei Wang
This study introduces porous ZnO@C nanoplates to improve lithium-ion battery performance, and the addition of reduced graphene oxide (rGO) further enhances capacity at high current density.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Tingting Liu,Lei Wang,Chenxu Sun,Xiu Liu,Rui Miao,Yongtao Lv
Fluvastatin, a commonly used cholesterol-lowering drug, has attracted considerable attention because of its adverse effects on human beings. Photolysis and ZnIn 2 S 4 photocatalysis of fluvastatin under UV–Vis irradiation were compared based on analysis of reactive oxygen species (ROS), degradation pathways, and toxicity evaluation. The removal rates of fluvastatin by photolysis and photocatalysis were 71.07% and 99.79%, respectively. Photolytic degradation of fluvastatin was conducted in the absence of ROS, whereas O 2 − played a vital role and OH played an auxiliary role during the photocatalytic process. The photolytic degradation of fluvastatin was achieved through cleavage of the C C, C N, and C C bonds. Because of the limited photon energy, photolytic products with stable structure did not decompose easily, which resulted in chemical oxygen demand (COD) removal rate of the photolytic system only 15.62%. The photocatalytic degradation of fluvastatin was achieved through direct cleavage of the chemical bonds under the synergistic oxidation of O 2 − and OH, and the hydroxylation reaction under OH attack. The COD removal rate of the photocatalytic system reached 43.05%. The photocatalytic samples were slightly less toxic than fluvastatin, whereas the photolytic samples were more toxic than fluvastatin. Therefore, the toxicity of the photolytic samples was significantly higher than that of the photocatalytic samples. Photocatalysis was an effective way for mitigation and elimination of harm of statins to the environment than photolysis.
研究领域:
环境化学
·
药物代谢
·
光化学
·
环境污染治理
·
毒理学
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2018
·Vol. 33
·期 4
·849-854
·
IF 0.524
Du Yue,Yang Peng,Lei Jiaheng,Zhou Shiyu,Li Junsheng,Du Xiaodi
Three-dimensionally ordered (3DOM) macroporous phosphotungstic acid/SiO 2 (HPW/SiO 2 ) materials were prepared by using colloidal crystal as templates and applied for oxidative desulfurization (ODS) of the model fuel oil. The obtained HPW/SiO 2 materials were characterized through scanning electron microscopy, powder X-ray diffraction, N 2 sorption, and Fourier transform infrared spectroscopy. The results indicated that 3DOM HPW/SiO 2 possessed hierarchical pore architectures which contained ordered macropores and disordered mesopores, with the Keggin type HPW embedded in the framework of pore structure. The removal rate of dibenzothiophene (DBT) could reach 100% under the optimum conditions, moreover. The performance was only slightly decreased for the regenerated catalyst after 7 cycles.
研究领域:
材料化学
·
环境催化
·
能源化工
·
纳米材料
·
工业化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Lele Cui,Peipei Ding,Ming Zhou,Wenheng Jing
Electrochemical technology offers the possibility of in situ hydrogen peroxide generation whose productivity greatly depends on the cathode properties and the reactor configuration. Herein, cerium oxide modified graphite felt is prepared and used as cathode. Ceramic membrane is integrated dividing the cell to two compartments and preventing decomposition of cathode-generated H 2 O 2 at the anode. H 2 O 2 is found almost impermeable through the membrane as concentration difference <0.5 M. The double-cell reactor performs higher energy efficiency than the conventional electrolytic cell. And H 2 O 2 accumulation rate has been enhanced in the double-cell in comparison with the undivided one, no matter using either bared or modified cathode. Operation parameters including flow rate of O 2 ( F O 2 ), flow rate of electrolyte solution (F solution ), applied current (I) and pH were optimized. Accumulated concentration of H 2 O 2 on the modified cathode reached 260.7 mg/L with the current efficiency up to 75.7% (working conditions C Na 2 SO 4 = 0.05 M, pH = 2, I = 50 mA, F O 2 = 0.2 L/min and F solution = 800 μL/min). The yield was 3.8 times higher than using the unmodified cathode. Energy consumption was reduced to 4.8 kWh/kg in the double-cell system (22.1 kWh/kg in the single-cell). In a conclusion, the double-compartment flow reactor is an improved configuration for energy effectiveness and increased productivity of H 2 O 2 for E-Fenton process.
研究领域:
环境工程
·
电化学工程
·
材料科学
·
能源技术
·
水处理技术
·
反应器设计
·
催化材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 13
·20810-20818
·
IF 3.83
Mengjing Liu,Sun-Wai Chiang,Xiaodong Chu,Jia Li,Lin Gan,Yanbing He,Baohua Li,Feiyu Kang,Hongda Du
Herein, oriented boron nitride (BN)/alumina (Al 2 O 3 )/polydimethylsiloxane (PDMS) composites were obtained by filler orientation due to the shear-inducing effect via 3-D printing. The oriented BN platelets acted as a rapid highway for heat transfer in the matrix and resulted in a significant increase in the thermal conductivity along the orientation direction. Extra addition of spherical Al 2 O 3 enhanced the fillers networks and resulted in the dramatic growth of slurry viscosity. This, together with filler orientation induced the synergism and provided large increases in the thermal conductivity . A high orientation degree of 90.65% and in-plane thermal conductivity of 3.64 W/(m∙K) were realized in the composites with oriented 35 wt% BN and 30 wt% Al 2 O 3 hybrid fillers. We attributed the influence of filler orientation and hybrid fillers on the thermal conductivity to the decrease of thermal interface resistance of composites and proposed possible theoretical models for the thermal conductivity enhancement mechanisms.
研究领域:
材料科学
·
高分子化学
·
热管理材料
·
先进制造
·
复合材料工程
✓ 已验证
DOI
高影响因子
Biomed Research International
·
2018
·Vol. 2018
·期 1
·5314320
·
IF 2.583
Hong-Xin Cui,Fang-Fang Duan,Shan-Shan Jia,Fang-Rong Cheng,Ke Yuan
Torreya grandis Fort. ex Lindl. is a plant belonging to the Taxaceae family and Torreya grandis cv. Merrillii is the only grafted and thoroughbred species belonging to this species. In this study, we extracted five different seed oils, including T. grandis seed oil (TGSO), T. grandis “Xiangyafei” seed oil (XYSO), T. grandis “Zhimafei” seed oil (ZMSO), T. grandis “Majus”seed oil (TGMSO), and T. grandis “cunguangfei” seed oil (CGSO) using physical pressure. The resulting extracts were analyzed to determine their fatty acid composition, antioxidant activity, and inhibitory activity towards tyrosinase. The results of the antioxidant activity assays revealed that XYSO and ZMSO exhibited much greater DPPH radical scavenging activity and ferric reducing power than TGSO. Notably, all five of the seed oils showed dose-dependent inhibitory activity towards tyrosinase. XYSO and TGSO gave the highest activities of all of the seed oils tested in the current study against monophenolase and diphenolase, with IC 50 values of 227.0 and 817.5 μ g/mL, respectively. The results of this study show that wild TGSOs exhibit strong antioxidant and tyrosinase inhibition activities. These results therefore suggest that wild TGSOs could be used as a potential source of natural antioxidant agents and tyrosinase inhibitors.
研究领域:
植物化学
·
食品科学
·
药用植物学
·
生物活性成分
·
天然产物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）