MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Chao Chen,Lei Cai,Liang Li,Lixia Bao,Zhengguo Lin,Guoqiang Wu
In order to develop an efficient and environmental friendly approach for epoxidation of soybean oil (SO), a series of hetero-catalysts, titanium silicalite-1 (TS-1) with different Si/Ti ratio (TS-1- x , x = 40, 70, 80), mesoporous TS-1-40 (MTS-1-40) and anatase TiO 2 , were prepared under controlled conditions. These different catalysts were characterized by various characterization methods like XRD , IR, UV–Vis, TGA , ICP , SEM, TEM and N 2 -adsorption, respectively, and the catalytic reaction experiments of the SO epoxidation were studied systematically using hydrogen peroxide (H 2 O 2 ) as clean oxidant over the different catalysts. The results reveal that the TS-1- x catalysts exhibit higher epoxidation catalytic activity and less consumption of H 2 O 2 than anatase TiO 2 , and the number of framework Ti sites in TS-1 structure played a very important role in their catalytic performance of the epoxidation reaction, which is attributed to the unique nature and coordination geometry of the Ti sites in TS-1 framework. Furthermore, the reusability and regeneration behaviors of TS-1-40 catalyst were also studied.
研究领域:
催化化学
·
绿色化学
·
材料科学
·
工业化学
·
有机合成
·
环境友好工艺
·
能源与资源工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 20
·7746-7753
·
IF 8.262
Wenpeng Ni,Shimin Liu,Yuqing Fei,Yude He,Xiangyuan Ma,Liujin Lu,Youquan Deng
The catalytic activity of a cathode material plays a vital role in determining the electrochemical performance of Li–O2 batteries. Herein, N-doped mesoporous carbon-supported CoO@Co nanoparticles are prepared in situ using the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrachlorocobalt ([BMIm]2[CoCl4]) as the precursor with silica as the hard template. The material was characterized by TGA, BET, XRD, TEM, XPS, and H2-TPR. After exposure to air, the species on the surface of the Co is CoO, as verified by XPS. The pore size is about 2 nm, and the CoO@Co nanoparticles were irregularly shaped and sized in the range of 20–300 nm, which may have been due to the aggregation of ultrafine nanoparticles. The existence of an interaction between the CoO@Co nanoparticles and the N-doped support is confirmed by XPS and H2-TPR. The catalyst shows superior activity for oxygen evolution reaction (OER) manifested in its lower charge potential (3.75 V at the current density of 100 mA g−1). Enhanced performances in coulombic efficiency, rate capability, and cycling stability (55 cycles) are also realized. Finally, these improvements, with the exception of the catalytic activity of CoO, may benefit from the interaction between the carbon supporter and the CoO@Co nanoparticles.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米催化
·
先进电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xingzhong Guo,Pengan Yin,Wei Lei,Hui Yang,Kazuyoshi Kanamori,Kazuki Nakanishi
Hierarchically porous ZnAl 2 O 4 spinel monolith derived from ionic precursors has been successfully prepared via the sol-gel route accompanied by phase separation in the presence of poly (ethylene oxide) (PEO) and propylene oxide (PO). Appropriate amounts of PEO as a phase-separation inducer and PO as a gelation mediator allow the formation of the xerogel with bicontinuous macrostructure and a monolithic shape. The macropore size of the resultant dried gel is mainly distributed in the range of 0.2–1 μm, and the whole porosity is about 65%. The dried gel is constructed by crystalline Zn Al hydrotalcite, becoming amorphous after heat-treated at 300–500 °C in air, and is further transformed into single phase ZnAl 2 O 4 spinel with plate-like shape at 600 °C. The macroporous structure is well maintained while the porosity increases to 75% and the surface area rises to 109 m 2 g −1 after heat-treatment.
研究领域:
材料科学
·
无机化学
·
多孔材料
·
功能陶瓷
·
纳米结构材料
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 16
·7440-7450
·
IF 7.233
Juanjuan Qi,Ke Chen,Yi Xing,Hua Fan,Hewei Zhao,Jie Yang,Lidong Li,Bingyi Yan,Jing Zhou,Lin Guo,Shihe Yang
Currently, the development of semiconducting metal oxide (SMO)-based gas sensors with innovative modification and three-dimensional (3D) structural designs has become a significant scientific interest due to their potential for addressing key technological challenges. Herein, gas sensing devices based on the 3D hierarchical monoclinic-type structural Sb-doped WO3 (HMSW) gas sensing material were successfully constructed by ordered assembly of urchin-like monoclinic-type structural (P2/m) Sb-doped WO2.72 (W18O49) (UMSW) nanocrystals and nanowires. The crystalline microstructure, composition, morphological characteristics, and possible growth mechanisms were systematically investigated. The results of the gas sensor measurements, performed simultaneously on multiple samples, indicated that the 3D HMSW material has superior sensitivity (S = 122) and high selectivity to ppm-level NO2 at 30 °C with a significantly larger response than the best-reported values from other WO3-based gas sensors fabricated so far. All the results clearly demonstrate that the combined effects of abundant structural defects derived from Sb doping modification, reduced band gap, and 3D hierarchical microstructure synergistically play a key role in the NO2 gas sensing performance. Such excellent gas sensing performance foresees the great potential application of 3D hierarchical structural WO3-based sensors for fast and effective detection of toxic gases that can aid in human health and public safety.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
环境健康
·
公共卫生安全
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Zhongyun Zhou,Ke Wang,Zeguang Yin,Pengfei Zhao,Zhen Su,Ji Sun
Highly efficient K 2 CO 3 -doped lithium orthosilicate (Li 4 SiO 4 ) sorbents were synthesized using acid treatment to overcome the typical kinetic limitations of sorbents at low CO 2 concentrations. The effects of K 2 CO 3 on the structure and absorption properties were characterized using various morphological characterization techniques, differential scanning calorimetry (DSC) and thermogravimetric analysis (dynamic and isothermal). The results showed that different amounts of K 2 CO 3 greatly affected the physical-chemical properties and absorption kinetics of the sorbents. On one hand, K 2 CO 3 formed a solid solution with Li 4 SiO 4 and generated favorable characteristics (a smaller crystal size, corrugated morphology, larger surface area and higher surface concentration of Li 2 O), significantly facilitating the chemisorption processes. On the other hand, a higher amount of doped K 2 CO 3 was located on the surface, which induced molten phases during CO 2 absorption, remarkably decreasing the diffusion processes. Therefore, 0.1 M K 2 CO 3 doped sorbent obtained noticeable absorption capacity and good regenerability in 15 vol.% CO 2 .
研究领域:
材料科学
·
环境化学
·
能源工程
·
无机化学
·
化学工程
✓ 已验证
DOI
高影响因子
IONICS
·
2013
·Vol. 19
·期 11
·1567-1572
·
IF 1.674
Qin Xueying,Wang Jinglun,Mai Yongjin,Tang Daoping,Zhao Xinyue,Zhang Lingzhi
Oligo(ethylene oxide)-functionalized trialkoxysilanes were synthesized through hydrosilylation reaction by reacting trialkoxysilane with oligo(ethylene oxide) allyl methyl ether using PtO 2 as a catalyst. The physical properties of these compounds, such as viscosity, dielectric constant, and ionic conductivity, were characterized. Among them, [3-(2-(2-methoxyethoxy)ethoxy)-propyl]triethoxysilane (TESM2) exhibited a commercial viable ionic conductivity of 1.14 mS cm −1 and a wide electrochemical window of 5.2 V. A preliminary investigation was conducted by using TESM2 as an electrolyte solvent for high-voltage applications in lithium-ion batteries. Using 1 M LiPF 6 in TESM2 with 1 vol% vinyl carbonate as an electrolyte, LiCoO 2 /Li half-cell delivered a specific capacity of 153.9 mAh g −1 and 90 % capacity retention after 80 cycles (3.0–4.35 V, 28 mA g −1 ); Li 1.2 Ni 0.2 Mn 0.6 O 2 /Li 4 Ti 5 O 12 full cell exhibited the initial capacity of 161.3 mAh g −1 and 86 % capacity retention after 30 cycles (0.5–3.1 V, 18 mA g −1 ).
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kaixin Li,Xin Yang,Juntao Gao,Yingshuang Guo,Yixuan Wang,Yu Zou,Zhikang Li,Zhe Lü
An in-depth comprehension of the structural characteristics of perovskite and the response mechanisms is crucial for designing materials with excellent properties. Here, the performance of several kinds of Sr 0.75 Pr 0.25 Fe 1-x Co x O 3-δ (x = 0, 0.25, 0.5, 0.75, 1) in an alkaline environment was thoroughly examined. Sr 0.75 Pr 0.25 Fe 0.25 Co 0.75 O 3-δ displayed the lowest overpotential (337 mV @ 10 mA·cm −2 ) and Tafel slope (69.3 mV·dec −1 ) in 0.1 M KOH and possessed excellent performance in zinc-air batteries. Cobalt doping encourages the positive shift of the O 2p band center, boosting the number of electrons around the Fermi energy level and delivering an increase in conductivity, according to DFT and experimental studies. Compared to Sr 0.75 Pr 0.25 FeO 3-δ , the rate-limiting step of Sr 0.75 Pr 0.25 Fe 0.25 Co 0.75 O 3-δ changes from OH*→O* deprotonation to OH* adsorption, which significantly decreases the energy potential barrier during OER process. The A/B site doping method is universal and facile, which is essential to comprehend and develop effective perovskite oxide for zinc-air battery electrodes.
研究领域:
材料化学
·
电化学
·
能源材料
·
催化科学
·
固态离子学
·
表面科学
·
纳米材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xueqian Ji,Yuxing Xu,Yuncheng Zhou,Jiechen Song,Hailan Feng,Pengfei Wang,Jun Yang,Fuchang Zhuge,Haijiao Xie,Qiangqiang Tan
Because of high energy density and work voltage, the Li-rich materials are considered to be one of the most promising next-generation lithium-ion batteries. However, the commercial applications are limited by the capacity loss, poor rate capability, and voltage decay during cycling. Herein, functionalizing the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 by Ca 0.95 Bi 0.05 MnO 3 is proposed, which suppresses the formation of the oxygen vacancies and maintains structural stability by high oxygen affinity and alleviative electrolyte corrosion. Electrochemical tests demonstrate that this admirable electrode delivers excellent cycling stability. The Li-rich electrode decorated with 5 wt.% Ca 0.95 Bi 0.05 MnO 3 exhibits a stable capacity retention of 86.5% at 0.1C after 200 cycles and an excellent full cell performance with the energy retention of 95.4% at 0.1C after 100 cycles. Moreover, the voltage decay of the modified material is restrained from 5.02 to 3.07 mV per cycle over 200 cycles. The finding here sheds new light on the development of the better Li-rich cathodes for improving electrochemical performance of electrode materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
·
功能材料
·
固态化学
·
电极工程
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 8
·期 4
·816-823
·
IF 1.821
Juanjuan Lu,Xiuhui Liu,Yanjun Zhang,Yidan Liu,Ming Li,Xiaoquan Lu
A kind of water-dispersible Pt nanoparticle–reduced graphene oxide hybrid material (Pt–rGO) has been prepared by in situ reduction of both graphene oxide (GO) and the Pt precursor in acidic solution using metallic Zn powder. Great amounts of highly dispersed Pt nanoparticles could be well loaded on the surface of the graphene, as revealed by transmission electron microscopy (TEM). In addition, the nanocomposites were also characterized by Fourier transform-infrared spectrometry (FT-IR), ultraviolet-visible absorption spectrometry (UV-Vis), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The experimental results demonstrated that the constructed sensor exhibited excellent catalytic activity toward H2O2, and obtained a wide linear range from 1.0 × 10−9 to 1.4 × 10−3 M with low limit of detection (LOD) of 3.4 × 10−10 M, which was superior to that obtained with other H2O2 electrochemical sensors reported previously. Furthermore, it can also be successfully applied to real sample analysis in human serum with satisfactory recoveries, and the electrocatalytic mechanism of the constructed sensor was briefly discussed.
研究领域:
分析化学
·
纳米生物技术
·
电化学传感
·
生物医学工程
·
转化医学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2016
·
IF 2.265
Yifeng Han,Xuanhong Ye,Hong Zhu,Yuexiang Li,Xiaojun Kuang
Ba 6 Na 2 M 2 Mn 2 O 17 (M=Nb, Ta) oxides were synthesized by high-temperature solid-state reaction. The compounds adopt 6-layer perovskite-related structure (referred to as 6C) in P 3 ̅ m 1, analogous to Ba 6 Na 2 Nb 2 P 2 O 17 . The 6C structure consists of cubic ( c ) BaO 3 layers and pseudo-cubic ( c' ) oxygen-vacancy-ordered BaO 2 layers stacked according to a sequence of c'ccccc . Ordering of oxygen vacancies in oxygen-deficient c' -BaO 2 layers leads to two successive isolated tetrahedral layers, which stabilize an unusual +5 oxidation state for Mn cations in the tetrahedral sites. In Ba 6 Na 2 M 2 Mn 2 O 17 , these two Mn 5+ O 4 layers are sandwiched by two single octahedral NaO 6 layers that connected by two successive octahedral NbO 6 layers, forming alternative 2:1-ordered (Ba 3 NaM 2 O 9 ) - and (Ba 3 NaMn 2 O 8 ) + perovskite-like units along the stacking direction. The Mn 5+ O 4 tetrahedral units act as a turquoise chromophore in Ba 6 Na 2 M 2 Mn 2 O 17 , making these two compounds potential turquoise-coloring materials for the cool pigments .
研究领域:
无机化学
·
材料科学
·
固体化学
·
功能材料
·
颜料化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Ze Feng,Yujia Xie,Fang Hao,Pingle Liu,He'an Luo
A series of manganese metalloporphyrins were prepared and tested in cyclohexane oxidation. It has been found that the manganese 5,10,15,20-tetrakis(4-nitrophonyl) porphyrin (Mn-TNPP) presents better catalytic performance. The Mn-TNPP was then immobilized on different supports, and characterized by UV–vis, FT-IR, XRD, TG/DTG and ICP. Among these supported Mn-TNPP catalysts, Mn-TNPP/ZnO exhibits the best selectivity to KA oil and higher turnover number in cyclohexane oxidation. The influence of the reaction conditions and the recycle of the catalysts are discussed. Mn-TNPP/ZnO catalyst presents the average cyclohexane conversion of 7.17%, KA oil selectivity of 91.18%, and the average catalytic turnover number of 6.53 × 10 4 after six times of recycle under 150 °C and 1.0 MPa.
研究领域:
催化化学
·
有机合成
·
工业化学
·
材料化学
·
绿色化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Longqian Xu,Yu Xie,Yang Zong,Yunfeng Mao,Bing Zhang,Huaqiang Chu,Deli Wu
Carbon resource recovery from toxic organic wastewater to reduce unnecessary energy loss and greenhouse gas emissions is rarely pursued. In the present study, a promising approach for formic acid (FA) recovery from EDTA wastewater was proposed by coupling ozonation and flow-electrode capacitive deionization (Ozo/FCDI). In the ozonation process, a FA productivity of 25% was obtained with the complete degradation of EDTA. The FA recovery from wastewater was compared under electrodialysis (i.e., without the use of flowable carbon electrodes, 0 wt%) and FCDI (i.e. using 5 wt% flowable carbon electrodes) processes and the results demonstrated the superiority of the FCDI process. After 390 min of operation, the accumulated FA concentration in the anode chamber of the FCDI system had increased to 633.6 mg/L with a low energy consumption of 8.0 kWh/kg FA, which was 1.8 times of the FA concentration in the electrodialysis (ED) process and nearly 6.4 times in the feed stream. These findings suggest the effective acquisition of high value-added FA in the Ozo/FCDI system; may provide new opportunities and challenges for the recovery of organic compounds.
研究领域:
环境工程
·
废水处理
·
资源回收
·
电化学工程
·
可持续化学
·
污染控制化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）