JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Hongying Li,Xueliang Wang,Tao Wang,Fengxia Xiao
The partially crystalline NiFe layered double hydroxide (pc-NiFe-LDH) nanosheets , as a high-efficient and cost-effective catalyst toward oxygen evolution reaction (OER), were synthesized by a facile, green and time-saving strategy in this work. The pc-NiFe-LDH can spontaneously grow in situ on the Ni foams (NF) at room temperature and does not consume any extra energy. The 3D structure of the pc-NiFe-LDH/NF with more active sites was confirmed by SEM, TEM and the calculated large electrochemical active surface area (ECSA) of 118 cm 2 , which endowed the pc-NiFe-LDH/NF with an outstanding OER performance in 1.0 M KOH. The overpotentials of 133 mV and 153 mV ( vs . RHE, with 95% iR compensation) at the current density of 20 mA cm −2 and 100 mA cm −2 were obtained, respectively. The pc-NiFe-LDH/NF showed rapid OER kinetics and efficient mass and electron transfer with a small Tafel slope of 30 mV dec −1 , and excellent endurance for 17 h long-term continuous OER operation at 1.609 V ( vs . RHE, without iR correction) with 2.6% enhancement of the current density. The performance was superior to those of most reported NiFe-based catalysts, which made it grand feasibility in practical industrial applications.
研究领域:
电化学
·
材料科学
·
催化化学
·
能源材料
·
纳米科技
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Dongjing Jiang,Zhi Dong,Zunfeng Du,Qian Zhao,Hui Wang,Zongqing Ma
It is an effective way to enhance the mechanical properties of Mo alloy by adding oxide strengthening phase. However, the oxide second-phase particles in oxide dispersion strengthened Mo (ODS-Mo) alloy prepared via traditional mechanical alloying generally coarsen at grain boundaries (GBs), greatly weakening their strengthening effect . To solve this problem, single and multiple oxide particles strengthened Mo alloys are developed via wet chemical method and subsequent low-temperature sintering in this work. After doping CeO 2 , the compressive yield strength (340.3 ± 8.1 MPa) and hardness (410 ± 13 HV) of Mo–Y 2 O 3 (Mo–Y) alloy were decreased by 17.9% and 22.7%, respectively. However, after doping La 2 O 3 , the compressive yield strength and hardness of Mo–Y alloy are further increased by 89.4% and 21.0%, respectively. According to microstructure observation and theoretical calculation, CeO 2 doping decreases the volume fraction of intergranular oxide particles and weakens interfacial drag force, finally promoting Mo grain growth and worsening the mechanical properties of Mo–Y alloy. In contrast, after doping La 2 O 3 , more oxide particles are dispersed at GBs, and their coarsening are inhibited. This results in a stronger Zener force. Moreover, interfacial drag force can also be increased through doping La 2 O 3 . Two forces synergistically hinder GBs migration. Therefore, La 2 O 3 doping leads to Mo grain refinement and ultimately enhances the mechanical properties of Mo–Y alloy. These results in our work can provide theoretical guidance for choosing proper oxide dopants to prepare ODS alloys with excellent mechanical properties.
研究领域:
材料科学
·
金属学与热处理
·
结构材料
·
粉末冶金
·
固态相变
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2020
·
IF 2.6
Ming Zhang,Fengqi Zhao,Ting An,Yanjing Yang,Hui Li,Qing Pan,Xiaohong Wang,Zhoufeng Jiang
Thermal decomposition performance of the insensitive energetic compound 1,1-diamino-2,2-dintroethene (FOX-7) is essential for its application in the field of solid propellants. This study seeks to reveal the catalytic effects of reduced graphene oxide–bimetallic oxide nanocomposites (rGO–MFe2O4, M = Ni, Co, and Zn) on the thermal decomposition, kinetic parameters, and pyrolysis mechanism of energetic FOX-7. The results showed that the catalytic activities of the bimetallic iron oxide (NiFe2O4, CoFe2O4, and ZnFe2O4) increased obviously after anchoring on the surface of graphene. Particularly, the rGO–NiFe2O4 nanocomposite possessed the best catalytic activity for FOX-7 thermal decomposition. The high thermal decomposition peak temperature (THDP) and the apparent activation energy (Ea) of FOX-7 were decreased by 57.4 °C and 54.27 kJ mol–1 after mixing with the rGO–NiFe2O4 nanocomposite. The excellent catalytic activity of rGO–NiFe2O4 can be attributed to the synergistic interaction between rGO and NiFe2O4, which is beneficial for the reduction of activation energy and a high thermal decomposition peak temperature of FOX-7. This study is helpful for the rational design of a solid propellant containing FOX-7 and to understand the thermal decomposition kinetics and mechanism of FOX-7.
研究领域:
材料化学
·
含能材料科学
·
热力学与动力学
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纳米复合材料
·
推进剂化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Jian Jiao,Jing Cao,Yu Xia,Lizhen Zhao
Amine functionalized mesoporous silica MSU-J with 3-D connective channel is employed as an effective absorbent for CO 2 . CO 2 adsorption measurements were conducted by gravimetry to investigate the effects of (i) framework structure, (ii) mesoporous structure, (iii) the type of organic amine, (iV) hydrolyzation treatment, (V) cycle performance. Comparing with tetraethylenepentamine (TEPA) functionalized SBA-15, TEPA functionalized MSU-J has lower gas diffusion resistance. The CO 2 uptake of 25MSU-J is 139.6 mg·g −1 , which is almost 2.5 times than that of SBA-15 of 58 mg·g −1 at 20 wt% TEPA loading. The different textured MSU-J is synthesized at 25 °C, 45 °C, 65 °C and impregnated with TEPA. 65MSU-J synthesized at 65 °C exhibits the larger pore size (16.2 nm) and CO 2 adsorption capacity due to pore size instead of larger specific surface area is more feasible for CO 2 diffusion. The MSU-J is impregnated with tetraethylenepentamine (TEPA), diethylenetriamine (DETA), triethylenetetramine (TETA). TEPA impregnated MSU-J possesses higher thermostability (200 °C) and CO 2 capture (164 mg·g −1 ) than counterparts, due to higher N content and the stronger combination between support and amine. The regeneration of Si OH from Si O Si effectively improves the CO 2 adsorption capacity. Both MSU-J and hydrolyzing MSU-J exhibit good cycle performance of CO 2 capture after 6 times cycle.
研究领域:
材料科学
·
环境化学
·
吸附技术
·
能源工程
·
纳米材料
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Hui Wang,Wei Yang,Penghui Tian,Jie Zhou,Rui Tang,Shengji Wu
Catalytic combustion has been identified as one of the most efficient and economically feasible routes for removing volatile organic compounds. In this work, supported noble-metal (Pd and Pt) catalysts for catalytic combustion of toluene were prepared by an improved incipient wetness impregnation method. Controlled amounts of oleic acid (OA) were introduced into the aqueous solution of metal salts in this new preparation method, which improved Pd and Pt dispersion remarkably on SiO 2 , as confirmed by XRD and TEM. XPS results showed that introduction of OA in the catalyst preparation resulted in increased proportion of metallic palladium. All of the activities in catalysts with OA were much higher than those of the catalysts without OA in the same catalyst system. Among the catalysts prepared, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst exhibited the best catalytic activity for toluene oxidation, and the T 98 of toluene was only 160 °C under the conditions of toluene concentration at 1000 ppm and SV at 60,000 mL/(g h). Furthermore, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst maintained high catalytic activity in the active stability test at 160 °C, and the result of TG indicated that no coke was formed on the spent catalyst.
研究领域:
环境催化
·
材料化学
·
化学工程
·
大气污染控制
·
纳米催化
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2018
·
IF 0
Ke Li,Ke Liu,Hong Ni,Bin Guan,Reggie Zhan,Zhen Huang,He Lin
A novel catalytic system combining oxidation catalyst with electric field was applied for low-temperature CH 4 oxidation at low CH 4 concentration (0.2% CH 4 ). Compared with conventional catalytic process, significant improvement in activity was observed over PdCeZrO x catalyst in electric field. For example, the light-off temperature (T 50 ) of CH 4 (0.2% CH 4 ) of 1 wt % PdCe 0.75 Zr 0.25 O x catalyst was approximately 255 °C in an electric field with 3 mA electric current. The impact of electric field in CH 4 oxidation over PdCeZrO x catalyst was thoroughly investigated. The XRD and XPS results revealed that electric field provided free electrons that facilitated the release of lattice oxygen in the ceria-zirconia solid solution, therefore reinforced Pd0 oxidation and the formation of palladium oxide (PdO x , x > 0) on catalyst surface. Electric field also enhanced the reducibility of the PdO x , which provided active oxygen for CH 4 oxidation at low temperature. With in-situ FTIR technique, it was found that electric field greatly promotes the chemisorption and dehydrogenation of CH 4 , thereby accelerates the chemical reactions of the intermediate products, so as to promotes CH 4 oxidation. The mechanism of catalytic oxidation of CH 4 in electric field was proposed based on comprehensive investigations above.
研究领域:
催化化学
·
环境科学
·
材料化学
·
能源化学
·
表面科学
✓ 已验证
DOI
MATERIALS TECHNOLOGY
·
2018
·
IF 1.232
Guangyu Wu,Weinan Xing
Heterogeneous semiconductor photocatalysis has been considered as a cost-effective alternative for the eliminating hazardous pollutants and generating sustainable energy. Graphene, a 2D allotrope of carbon, has received significant attentions due to its outstanding properties. In this work, a highly efficient visible-light-driven ternary heterostructure semiconductor RGO/Ag2O/Ag2WO4 (RGAAW) Ag-based photocatalyst was prepared and its photocatalytic activity was evaluated by photodegradation of methylene orange (MO). The morphology, structure and optical absorption properties of the as-prepared RGAAW were characterized by SEM, XRD, XPS, FT-IR and UV−vis DRS, respectively. The obtained result was found that the as-prepared RGAAW exhibited the excellent photocatalytic activity, which was almost 11.5 and 7 times as high as those of individual Ag2O and Ag2WO4, respectively. The enhancement of photocatalytic performance could be attributed to the reduced graphene oxide sheets can function as an electron collector and transporter to lengthen the lifetime of the charge carriers. Moreover, the as-prepared RGAAW showed excellent stability toward the photodegradation of methyl orange (MO). The possible mechanism of photocatalytic activity enhancement was proposed.
研究领域:
材料科学
·
光催化
·
环境功能材料
·
纳米材料
·
半导体物理
·
表面化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 32
·6571-6575
·
IF 4.726
Enshuang Zhang,Yuyan Liu,Jianxin Yu,Tong Lv,Li Li
In the current work, a three dimensional porous nickel based (p-Ni/NiO) template processed by a simple electrodeposition method was used to fabricate the hierarchical gecko-inspired microarrays. The microstructure of p-Ni/NiO templates is controlled and optimized by deposition and post-treatment parameters. Bio-inspired polydimethylsiloxane (PDMS) microarrays with different morphologies were fabricated by casting and showed excellent adhesion strength and superhydrophobicity. This feasible method is a simple fabrication approach for the gecko dry adhesive using a reusable template.
研究领域:
材料科学
·
仿生学
·
表面工程
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2015
·Vol. 73
·期 2
·260-266
·
IF 1.106
Zha F. G.,Yao D. X.,Hu Y. B.,Gao L. M.,Wang X. M.
The landfill leachate treated by sonication in presence of Fe 2+ (US/Fe 2+ ) and then by photo-Fenton achieved the highest total organic carbon (TOC) removal efficiency among the screened processes. The lower initial pH, dosage of Fe 2+ and initial concentration of leachate were helpful in raising TOC removal efficiency of leachate by US/Fe 2+ . The optimal conditions for the US-photo-Fenton process were as follows: initial pH at 3.0, [H 2 O 2 ]/[TOC 0 ] at 2, [H 2 O 2 ]/[Fe 2+ ] at 5 and initial concentration of landfill leachate at 600 mg/L. The removal efficiency of TOC, chemical oxygen demand (COD) and 5-day biochemical oxygen demand (BOD 5 ) were 68.3, 79.6 and 58.2%, while the BOD 5 /COD rose from 0.20 to 0.43 at optimum condition. Based on gas chromatography–mass spectrometry (GC-MS) results, 36 of a total of 56 pollutants were completely degraded by US-photo-Fenton treatment.
研究领域:
环境工程
·
水处理技术
·
高级氧化过程
·
污染控制化学
·
环境化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2014
·Vol. 40
·期 9
·15199-15206
·
IF 2.086
Yanbo Yang,Xiao Peng,Si Chen,Liping Lin,Bao Zhang,Yaqing Feng
The novel hierarchical compact layer involving ZnO and TiO 2 blocking films is used to improve the overall performance of dye-sensitized solar cells. The ZnO compact films are fabricated as a bottom layer to block the electrons injection to the conductive glass and improve the open-circuit voltage. The TiO 2 compact layer is employed to suppress back electron transfer and avoid ZnO contacting the acid dyes directly. The short-circuit current density of the DSSC containing the hierarchical compact layer is improved by 30% compared to that of one with only ZnO as the compact layer. The open-circuit voltage is increased by 4% after introducing the additional TiO 2 blocking layer between the ZnO compact layer and mesoporous TiO 2 layer. Overall, the short-circuit current density, open-circuit voltage and solar energy conversion efficiency are enhanced by 15.3%, 3.7% and 29.6%, respectively, relative to the traditional DSSC without any blocking layers. The ZnO–TiO 2 blocking layer has been characterized by electrochemical impedance spectroscopy , open-circuit voltage decay and dark current measurement to reveal the mechanism of short-circuit current density and open-circuit voltage improvement.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光伏技术
·
表面科学
✓ 已验证
DOI
高影响因子
Applications in Energy and Combustion Science
·
2022
·
IF 0
Bingzhi Liu,Long Zhu,Qingbo Zhu,Hao Lou,Qiang Xu,Zhandong Wang
Ozone-assisted combustion is an advanced combustion technology that is considered a promising means for the active control of combustion. Ozone addition can enhance combustion processes and extend the experimental parameters to extreme conditions. In this work, ozone-assisted low temperature oxidation of methanol and ethanol in a jet-stirred reactor (JSR) was carried out at atmospheric pressure, with a fuel initial mole fraction of 0.005, an equivalence ratio of 0.28, and in the temperature range of 330–800 K. Significant conversions of methanol and ethanol were observed in the low temperature region when ozone was added. Numerous intermediate species were analyzed and quantified by synchrotron vacuum ultraviolet photoionization mass spectrometry and gas chromatography, which are crucially important for unraveling the low temperature oxidation reaction network. The kinetic model of NUIGMech1.1 is tentatively updated to better explain the measured results, although the improvements of the C 1 –C 2 core mechanisms are difficult. Ozone addition enhances the action of the reaction channel of related radicals. Model analysis shows that the kinetics of Ö/ȮH/HȮ 2 atoms/radicals are crucial for the overall reaction progress, as well as the reaction of HȮ 2 radicals with ozone, which mainly contributes to the formation of ȮH radicals during the initial reaction stage. Inconsistency between measurements and model predictions highlights the considerable uncertainty in the C 1 -C 2 alcohols subchemistry at lower temperatures. The experimental results obtained in this work and model development will motivate further study of the low temperature oxidation chemistry of methanol and ethanol.
研究领域:
化学工程
·
燃烧化学
·
反应动力学
·
能源化学
·
大气压反应器
✓ 已验证
DOI
CHINESE JOURNAL OF CATALYSIS
·
2018
·Vol. 38
·期 12
·2132-2140
·
IF 3.525
Lingfeng Li,Xiaolong Zhao,Donglai Pan,Guisheng Li
Photoactive WO 3 is attractive as a photocatalyst for green energy evolution through water splitting. In the present work, an electrochemical anodic oxidation method was used to fabricate a photo-responsive nanotube array-like WO 3 /W (NA-WO 3 /W) photoanode from W foil as a precursor. Compared with a reference commercial WO 3 /W electrode, the NA-WO 3 /W photoanode exhibited enhanced and stable photoelectrocatalytic (PEC) activity for visible-light-driven water splitting with a typical H 2 /O 2 stoichiometric ratio of 2:1 and quantum efficiency of approximately 5.23% under visible-light irradiation from a light-emitting diode ( λ = 420 nm, 15 mW/cm 2 ). The greatly enhanced PEC performance of the NA-WO 3 /Wphotoanode was attributed to its fast electron–hole separation rate, which resulted from the one-dimensional nanotube array-like structure, high crystallinity of monoclinic WO 3 , and strong interaction between WO 3 and W foil. This work paves the way to a facile route to prepare highly active photoelectrodes for solar light transfer to chemical energy .
研究领域:
材料科学
·
物理化学
·
能源化学
·
纳米科技
·
光催化
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）