CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Debao Liu,Baolu Shi,Chenqi Wang,Zeshuai Li,Xianbo Wang,Baosheng Xu,Lijie Qu
Herein, the SiC ceramic aerogels with in-situ growth of SiC nanowires (SiC w /SiC CAs) have been synthesized by polymer‐derived ceramics (PDCs) method. The morphology, microstructure, and phase composition of the as-prepared samples were systematically investigated through SEM, XRD , TEM , Raman spectrum, FT-IR spectrum, and XPS spectrum techniques. The results showed that the as-obtained SiC w has a diameter of about 80 nm and a length of 1–3.5 μm. In addition, the formation mechanism and evolution process of growth SiC w were systematically studied using a VLS growth mechanisms. The way in this work could be expanded to synthesize other Si-based porous ceramic aerogel nanostructed with nanowires.
研究领域:
材料科学
·
纳米技术
·
陶瓷
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Dongxiu Lu,Ruhui Ma,Yuan Chen,Yuancai Chen
In this study, Ni-doped Ti/SnO 2 -Sb anode (Ti/NATO) was prepared and used for electrocatalytic ozone production and in-situ activated peroxymonosulfate (E-Ti/NATO-PMS) to degrade bisphenol A (BPA). SEM, XRD and XPS results indicated that Ni doping could influence the transformations of Sb 5+ and Sb 3+ ions, which decreased the agglomeration of crystallites and increased the O ads and oxygen vacancy (O v ) concentrations. Ti/NATO 1.0 anodes significantly improved the ozone production via outcompeting of the adsorbed O 2ads over water, and inhibiting the desorption of O 2ads , to obtain the highest O 3 concentration with low onset potential and high oxygen evolution potential. E-Ti/NATO 1.0 -PMS system obtained over 92% BPA degradation within 60 min at 10 mA cm −2 and pH ranging from 4 to 10. Radical scavenging experiments revealed that O 3 in situ generated could directly electro-activate PMS into •O 2 − and 1 O 2 . The E-Ti/NATO 1.0 -PMS process could detoxify the BPA through chain scission, rearrangement and ring opening processes, and exhibited great potentials for application.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Qihong Xue,Zhikui Jiang,Chao Wang,Xian Kan,Jiaming Wang,Jiangang Chen
13-Ni/ZrO2, 13-Ni3P/ZrO2, 13-Ni/SiO2, and 13-Ni3P/SiO2 catalysts were used in the hydrogenation of diethyl oxalate (DEO) to ethyl glycolate (Egly) to investigate the modulating effect of phosphorus. XRD, TEM and FT-IR results show that phosphorus act as a divider of Ni metallic particle and shows a segregation effect. The presence of P transformed the linkage of surface metals from the original -Ni-Ni-Ni-Ni- to the P-Ni-P-Ni-P state, and FT-IR shows that the former adsorbed CO in a combination of linear and bridging adsorption mode, whereas the latter predominantly in CO linear adsorption. Bridging adsorption is via dual sites and makes the preliminary hydrogenation products less likely to detach from the catalyst surface thus facilitating deep hydrogenation, while linear adsorption facilitates partial hydrogenation by a rapid detachment of intermediate product like Egly. The various loading Ni3P/SiO2 catalysts show incomplete phosphorylation with increasing nickel loading, giving rise to a state of coexistence of Ni and Ni3P crystalline phases. This may lead to a coexistence of surface -Ni-Ni-Ni-Ni- and P-Ni-P-Ni-P and the corresponding assort of adsorption, e.g. bridging/linear ones, making deep hydrogenation occur partially besides stepwise hydrogenation.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Zhou,Wenwei Zhang,Xueqin Ma,Haichen Lai,Xingguang Zhang
Metal-zeolites catalysts are of great importance in selective organic conversions. Zeolites possess features of highly-ordered porous network, adjustable acidic properties (Brønsted/Lewis), spatial nanoconfinement effects, unique shape selectivity and the strong (hydrothermal-) stability. The role of zeolite hydroxyl (z-OH) groups, such as bridging ones in Si-O(H)-Al (B acids) and terminal ones in Al-OH and Si-OH (silanols), in catalysis is an interesting topic, particularly when they are not catalytic active sites, while they affect the catalytic performances. This study comprehensively investigated series of Au/USY catalysts in the selective oxidation of benzyl alcohol to benzaldehyde and clarified the dominating contributions of Al-associated z-OH groups to affecting catalytic conversions and selectivity via altering the Si/Al ratio and reducing z-OH groups by amorphous silica species derived from diethoxydimethylsilane under high-temperature calcination. The catalysts were characterized by XRD, BET, TEM, XPS, UV/Vis, FT-IR and in-situ DRIFT to investigate crystal structures, textural properties, morphologies, size distribution, chemical state of gold, acidity, and adsorptive properties. The experimental results proved that zeolites with a higher amount of z-OH groups tuned by Si/Al ratios or by diethoxydimethylsilane silylation exhibited higher catalytic activity because of the adsorption effect. Finally, a possible mechanism was discussed based on the experimental results and literature.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Naichao Chen,Bin Xiao,Xinwei Xu,Tao Sun,Meiyu Chen,Renchao Hu,Xinglei Deng,Xianqiang Chen,Hong Wang
In this paper, (1- x )Li 2 MoO 4 (LMO)- x Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 (NCZO) ceramic composites were consolidated using cold sintering method at a temperature of 150 °C, which is far below the sintering temperature of NZFO ceramic-based systems via conventional ceramic preparation method. The phase composition, microstructure, dielectric properties and magnetic properties of the as-cold-sintered LMO-NCZO ceramic composites were studied. The relative density of all composites is larger than 95 % at a cold sintering temperature of 150 °C for 30 min under a uniaxial pressure of 200 MPa. XRD results showed that the composites were only composed of two phases. SEM revealed that the NCZO particles were enwrapped by the LMO phase. The 0.46LMO-0.54NCZO ceramic composite exhibited excellent magnetodielectric properties with an effective permittivity of about 8.3, a dielectric loss of 0.003, a permeability of 7 and a magnetic loss of 0.024 (@10 MHz), which make it potentially applicable in the miniaturization of electronic devices.
研究领域:
材料科学
·
电气工程
·
陶瓷
·
复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Kui Ma,Naixin Wang,Chengcheng Wang,Quan-Fu An
In recent years, metal-organic framework (MOF) membranes have attracted much attention in many fields. However, the fabrication of MOF membrane with defect-free ultrathin separation layer on the surface of a substrate is very difficult. In this study, freezing assisted in situ growth strategy was used to prepare a nano-confined ZIF-8 composite membrane on a porous ceramic substrate . The frozen alumina substrate with the metal ion ice crystal inside the pores was immersed in ligand solution for the growth of ZIF-8 crystals. Then, ZIF-8 nanoparticles were grown inside the pores rather than on the surface of the substrate. The morphology and structure of the ZIF-8 particles and nano-confined composite membranes were characterized by XRD , SEM, FTIR , EDS, and nanoindentation . The obtained nano-confined ZIF-8 composite membrane exhibited excellent separation performance and stability for removing dyes from water. The influence of preparation conditions on membrane structure and property was also investigated. The freezing assisted method may provide an avenue for preparing MOF membranes in other fields.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Yinghui Sun,Guojie Zhang,Jiwei Liu,Peiyu Zhao,Peng Hou,Ying Xu,Riguang Zhang
CH 4 CO 2 reforming to syngas was investigated over three different activated carbon catalysts. To better understand the influence of the supports on the catalytic properties , catalysts were analyzed by some characterization methods, such as nitrogen adsorption–desorption isotherms, XRD , H 2 -TPR, NH 3 -TPD, CO 2 -TPD, FTIR, TEM and EDX . The results showed that the catalyst with AC 2 as the support provided the best catalytic activity . The CH 4 conversion and CO 2 conversion were 92% and 98% at 900 °C, respectively; best selectivity with the H 2 /CO ratio was close to 1 among the three supports used. It also showed a better stability at 900 °C. H 2 -TPR analysis showed that Co species in Co/AC 2 catalyst were strong interaction with the support. It was observed that active metals were well dispersed on the AC 2 support by the TEM. In addition, the ratio of CH 4 /CO 2 also had great influence on the CH 4 and CO 2 conversion.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 8
·期 1
·64-76
·
IF 5.2
Haosheng Xin,Haiyong Wang,Xiaohong Hu,Xiuzheng Zhuang,Long Yan,Chenguang Wang,Longlong Ma,Qiying Liu
Cellulose hydrolysis and further conversion to diketones and alcohols was performed with graphene layer encapsulated cobalt catalysts (Co@C) in phosphoric acid aqueous solution. A total of 60.5% yield of the products mainly including ethanol, 2,5-hexanedione (2,5-HD) and diols could be achieved in 0.06 M H3PO4 solution. A series of characterization methods such as XRD, XPS, TEM, TG-MS, BET, ICP, H2-TPD, NH3-TPD, and Raman were carried out to explore the catalyst formation mechanism and reaction activity. The results of the analysis indicated that the calcination temperature had a deep influence on the structure formation of the Co@C catalysts, thus leading to differences in the reaction activity. While the calcination temperature was determined at 700 °C, the Co@C catalyst meets with the requirements of optimal reaction activity, appropriate particle size, suitable surface area, and pore size. Besides, it was found that H3PO4 is not only favorable in cellulose hydrolysis but also cooperates with the Co@C catalyst in the hydrogenolysis of C–O bond and C–C bonds for the formation of products. This work provides a possible way for renewable cellulose conversion to diketone and alcohols over encapsulated non-noble metal catalyst combined with phosphoric acid aqueous solution.
研究领域:
化学工程
·
催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Tao Liu,Lijun Xu,Xuejie Wang,Haoliang Lv,Bicheng Zhu,Jiaguo Yu,Liuyang Zhang
The natural abundance of sodium has fostered the development of sodium-ion batteries for large-scale energy storage. However, the low capacity of the anodes hinders their future application. Herein, carbon-encapsulated MnSe-FeSe nanorods (MnSe-FeSe@C) have been fabricated by the in-situ transformation from polydopamine-coated MnO(OH)-Fe 2 O 3 . The heterostructure constructed by MnSe and FeSe nanocrystals induces the formation of built-in electric fields, accelerating electron transfer and ion diffusion, thereby improving reaction kinetics. In addition, carbon enclosure can buffer the volumetric stress and enhance the electrical conductivity. These aspects cooperatively endow the anode with superior cycling stability and distinguished rate performance. Specifically, the discharge capacity of MnSe-FeSe@C reaches 414.3 mA h g −1 at 0.1 A g −1 and 388.8 mA h g −1 even at a high current density of 5.0 A g −1 . In addition, it still retains a high reversible capacity of 449.2 mA h g −1 after 700 long cycles at 1.0 A g −1 . Further, the ab initio calculation has been employed to authenticate the existence of the built-in electric field by Bader charge, indicating that 0.24 electrons in MnSe were transferred to FeSe. The in-situ XRD has been used to evaluate the phase transition during the charging/discharging process, revealing the sodium ion storage mechanism. The construction of heterostructure material paves a new way to design performance-enhanced anode materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·D606
·
IF 3.12
Kui Liu,Jiajia Sun,Liqi Zhu,Yuxue Sang,Weiqun Shi,Zhifang Chai,Biao Wang,Mingliang Kang
The aim of this work is to explore the electrodeposition of uranium in low-melting LiCl-KCl-CsCl eutectic. A variety of conventional electrochemical techniques, including cyclic voltammetry (CV), chronopotentiometry (CP), and chronoamperometry (CA), were employed to study the electrochemical and kinetic properties of uranium at different temperatures ranging from 573 to 872 K. First, the electrochemical behaviors and diffusion coefficients of uranium species in the melts were investigated and compared to the published results. The temperature significantly affects the cathodic current response of the U4+/U3+ couple within the low temperature range. Moreover, the nucleation mechanisms of uranium in the electrodeposition process were evaluated, and the results indicated that nucleation and growth tend to occur via the same instantaneous mode at all applied temperatures and overpotential ranges. Finally, metallic uranium was deposited by potentiostatic electrolysis at an overpotential of −100 mV vs. U3+/U at different temperatures, and their morphologies and compositions were characterized by SEM-EDS and XRD, respectively. The results show that from 573 to 773 K, uranium deposits evolve form one-dimensional needle-like to multidimensional dendritic structures. No dendrite-free uranium deposits were obtained in the CsCl-containing melts regardless of the temperature.
研究领域:
材料科学
·
电化学
·
核工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yi-Zhao Chen,Ting-Ting Mao,Song-Yi Liao,Selina X. Yao,Yong-Gang Min
As novel two-dimensional materials, MBenes derived from bulk ternary metal borides (MAB phase) have attracted increasing attention but are limited by their preparation strategy. In this work, MoxBy (MBene) derivatives with an accordion-like structure were successfully prepared by completely etching an Al layer from MoAlB via a molten-salt method. The thermal behaviors, crystal structure, and surface chemical state were analyzed using DSC/TG, XRD and XPS analyses, respectively. The micro-morphology of the obtained MBene was then characterized using scanning electron microscopy and transmission electron microscopy accompanied by EDS mappings. The results reveal that the MBene synthesized at 620 °C (abbreviated as MBene-620) demonstrates its characteristic (020) peak and layered structure. When used as an advanced anode for Li-ion batteries (LIBs), the MBene delivers excellent electrochemical performances with a reversible specific capacity of 638.2 mA h g−1 after 100 cycles at a current density of 0.1 A g−1. As a promising green strategy, this molten-salt method provides a new opportunity to explore the wide-ranging applications of MBene series, particularly in new energy fields of LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yuxuan Ma,Dan He,Xiaojing Wang,Yuan Fu
Focused on energy and environment issues, in present investigation, an economical and eco-friendly photocatalyst for hydrogen evolution in water splitting reaction has been designed and fabricated. The characteristics by XRD, TEM, XPS and AFM confirmed that an octahedral H 2 Ta 2 O 6 is uniformly capsuled by ZnIn 2 S 4 thin clothes to form a package ZnIn 2 S 4 /H 2 Ta 2 O 6 heterojunction . The assembled ZnIn 2 S 4 /H 2 Ta 2 O 6 exhibits superior hydrogen generated performance with a value of 3217.31 μmol g −1 •h −1 under simulated sunlight irradiation, without obvious deactivation in five consecutive cycles. The enhanced activity and reusability are mainly attributed to ultrathin clothe-like shell, the well-matched band structure and a large tight contact interface in the package type construction, which can promote redox ability, extend light harvesting range and boost charge separation efficiency. The present study proposes a new design idea to assemble a highly efficient and durable photocatalyst for solar hydrogen generation by splitting water.
研究领域:
能源与环境
·
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）