CARBON
·
2023
·
IF 10.9
Dong Sui,Min Yao,Linqi Si,Kun Yan,Jingge Shi,Jianshe Wang,Charles Chunbao Xu,Yongsheng Zhang
Silica (SiO 2 ) is regarded as a promising anode for lithium-ion batteries due to the high specific capacity, abundant resources and low cost. However, the inherently poor electrical conductivity and the huge volume variation during charge/discharge process significantly hinder the application of SiO 2 . Designing nanostructured SiO 2 and coating with high conductivity materials are effective methods to solve the above challenges. In this work, advanced SiO 2 anodes were prepared by coating hollow SiO 2 nanotubes (SNTs) with lignin or phenolated and depolymerized lignin furfural resin (PDLF)-derived carbon. The novel structure of the obtained SNTs greatly promotes the rapid transport for both Li + and electron, increases the exposed active sites for Li + insertion and accommodates the volume change of SNTs. Especially, PDLF possesses abundant functional groups, high carbon content and thermosetting property, which are beneficial to the dispersion of SNTs and formation of a cross-linked 3D conductive network. Thereby, SNTs@C-PDLF presents higher specific capacity of 661 mAh g −1 at 100 mA g −1 , superior rate capability (262 mAh g −1 at 3000 mA g −1 ) and better cycling stability (549 mAh g −1 at 1000 mA g −1 after 800 cycles) compared with SNTs@C-lignin and pristine SNTs.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 5
·410
·
IF 3.444
Lei Ma,Shiyan Yuan,Taotao Jiang,Xiangming Zhu,Chunshan Lu,Xiaonian Li
Sulfur species (e.g., H2S or SO2) are the natural enemies of most metal catalysts, especially palladium catalysts. The previously reported methods of improving sulfur-tolerance were to effectively defer the deactivation of palladium catalysts, but could not prevent PdO and carrier interaction between sulfur species. In this report, novel sulfur-tolerant SiO2supported Pd4S catalysts (5 wt. % Pd loading) were prepared by H2S–H2aqueous bubble method and applied to catalytic complete oxidation of methane. The catalysts were characterization by X-ray diffraction, Transmission electron microscopy, X-ray photoelectron Spectroscopy, temperature-programmed oxidation, and temperature-programmed desorption techniques under identical conditions. The structural characterization revealed that Pd4S and metallic Pd0were found on the surface of freshly prepared catalysts. However, Pd4S remained stable while most of metallic Pd0was converted to PdO during the oxidation reaction. When coexisting with PdO, Pd4S not only protected PdO from sulfur poisoning, but also determined the catalytic activity. Moreover, the content of Pd4S could be adjusted by changing H2S concentration of H2S–H2mixture. When H2S concentration was 7 %, the Pd4S/SiO2catalyst was effective in converting 96% of methane at the 400 °C and also exhibited long-term stability in the presence of 200 ppm H2S. A Pd4S/SiO2catalyst that possesses excellent sulfur-tolerance, oxidation stability, and catalytic activity has been developed for catalytic complete oxidation of methane.
研究领域:
催化化学
·
环境催化
·
材料化学
·
能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2017
·Vol. 76
·期 4
·928-938
·
IF 1.197
Zhang Yefei,Liu Chao,Luo Lijun,Shi Yingying,Chen Yu,Wang Shan,Bian Longchun,Jiang Fengzhi
A stable SiO 2 material marked as CTAB-Ms(x) was synthesized by a novel sol-gel method. It was modified with hexadecyl trimethyl ammonium bromide (CTAB), which resulted in high adsorption capacity. Its microstructure and surface functional groups were characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared. The results showed that CTAB-Ms(x) had a core/shell structure in which the core was a CTAB micelle and the shell was SiO 2 . The prepared material was applied to adsorb bisphenol A (BPA). Pseudo-first-order kinetics equation, pseudo-second-order kinetics equation, Langmuir adsorption isotherm model, Temkin adsorption isotherm model, and thermodynamic equations were used to fit and analyze the experiment results. The theoretical maximum adsorption capacities calculated according to linear and non-linear forms of the Langmuir isotherm were 370.37 mg·g −1 and 198.80 mg·g −1 , and the adsorption equilibrium time was 120 min. A mechanism study showed that the high adsorption capacity was attributed to the solubilization effect of the CTAB micelle.
研究领域:
环境科学
·
材料科学
·
化学工程
·
环境污染治理
·
吸附材料
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Li Guo,Qiang Zhao,Chan Wang,Huidong Shen,Xuanxu an Han,Kailai Zhang,Danjun Wang,Feng Fu
Novel core-shell structural magnetic Fe3O4@SiO2/Bi2WO6 (F-BWO) was obtained by a multistep process. Bi2S3 Quantum Dots (QDs) with the size of about 5 nm were deposited on the surface of Bi2WO6 “shell” to obtain Fe3O4@SiO2/Bi2WO6/Bi2S3 (F-BWO-BS) heterostructures. The experimental results indicated that F-BWO-BS exhibits the enhanced fuel oil photocatalytic-oxidative-desulfurization (Photo-Cat-ODS) and RhB photocatalytic degradation activity than that of F-BWO. The as-prepared F-BWO-BS-2 exhibited the best activity, the rate constant ( k app /min −1 ) for RhB photocatalytic degradation is approximately 1.5 times higher than that of F-BWO. Furthermore, the F-BWO-BS-2 exhibited the best Photo-Cat-ODS activity, the desulfurization rate could reach 100% after illumination for 1.5 h. The enhanced photocatalytic activity of F-BWO-BS can be attributed to the synergistic effect of magnetic Fe 3 O 4 @SiO 2 support − “core”, Bi 2 WO 6 − “shell” and Bi 2 S 3 QDs. The experimental result also revealed that magnetic F-BWO-BS photocatalyst is easily magnetically separated with good stability and recyclability.
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Dawang Chu,Zhicheng Luo,Yingying Xin,Chengzhen Jiang,Shaofeng Gao,Zhihao Wang,Chen Zhao
The chemo-catalytic production of ethanol from nonedible lignocellulosic biomass is essential for mitigating energy shortage. In this work, we developed a multifunctional Pd-Cu-WO x /SiO 2 catalyst for the one-pot aqueous-phase conversion of cornstalk-derived cellulose to ethanol with a yield of 42.5C% at 300 °C and 4 MPa H 2 . Kinetic studies demonstrated that the transformation of cellulose to ethanol followed a number of consecutive steps namely, cellulose hydrolysis to glucose with H + in hot water (k 1 ), glucose conversion to glycolaldehyde over W species (k 2 ), glycolaldehyde hydrogenation to ethylene glycerol (EG) over Pd (k 3 ), and EG hydrogenolysis to ethanol over Cu (k 4 , rate-determining step). The individual rates were well balanced on Pd, Cu, and WO x species to achieve an ethanol formation rate of 0.163 g·g Cat . −1 h −1 . The addition of Au to Cu-WO x species led to a relatively low k 3 and thus the formation of a substantial amount of humins, while the Ru introduction catalyzed the over-hydrogenolysis of ethanol to methane and ethane with a high rate, thereby lowering the selectivity to ethanol. The characterization results showed that both the electronic properties of Cu + species and the Cu + /Cu 0 ratio on the Pd-Cu-WO x /SiO 2 catalyst contributed to a specific C O bond cleavage, especially for EG hydrogenolysis to ethanol during the cellulose conversion.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 10
·14315-14322
·
IF 5.532
Jie Chen,Yixin Gao,Chao Wang,Yu Yin,Jiaxing Song,Xiaodan Zeng,Zhigang Liu,Haifeng Jiang
Upconversion luminescence materials have gained extensive attentions owing to their unique luminescence characteristics of converting near-infrared excitation to visible light emission. However, how to improve the doping concentration of activator (usually <3 mol%) in traditional sensitizer-activator system is still a great challenge due to the luminescence quenching effect. In this work, NaErF 4 crystals with diverse crystal phases and morphologies were prepared by simple hydrothermal method , constructing a 100% doping concentration system of activator (Er 3+ ). With the increase of F − content, the phase of NaErF 4 transfers from cubic to hexagonal, and the morphology changes from nanospheres to hexagonal microflakes, meanwhile, the upconversion luminescence intensity also increases gradually. In addition, in order to further inhibit the luminescence quenching effect of NaErF 4 bare core, a series of NaErF 4 @SiO 2 core-shell samples with different SiO 2 shell thickness were successfully prepared. Compared with NaErF 4 bare core, the morphology and structure of the NaErF 4 @SiO 2 core-shell samples have no obvious change, but the UC luminescence intensity is significantly enhanced. Interestingly, the change of NaErF 4 crystal phase and SiO 2 shell thickness can both bring about multicolor luminescence. In addition, different from the traditional NaYF 4 :Yb, Er co-doping system, the as-prepared hydrophilic NaErF 4 and NaErF 4 @SiO 2 samples showed a greater red to green ratio (R/G > 1), which may expand their potential applications in biological imaging and sensing fields.
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 12
·4102-4106
·
IF 1.938
Tianyu Yao,Qin Tu,Xiang Han,Longlong Zhang,Dong-En Wang,Manlin Li,Sheng Chen,Jinyi Wang
Based on the formation of a red [Cd-diphenylcarbazide] complex, a simple and visible method for Cd2+ colorimetric detection was developed by doping SiO2 nanoparticles and diphenylcarbazide in polymethylmethacrylate electrospun fibers. Benefiting from the large surface area due to the addition of SiO2 nanoparticles, the color of the fibrous film changed clearly even in the presence of extremely low concentrations of Cd2+. The detection limit was found to be 1 × 10−8 M. Investigation of the selectivity of the fibrous film on the detection of various metal ions showed that only Cd2+ could induce a yellow-to-red color change. The results demonstrated that SiO2 and diphenylcarbazide doped polymethylmethacrylate fibrous films could act as highly selective strips for the detection of Cd2+ with little interference from other metal ions.
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·Vol. 31
·期 9
·3910-3920
·
IF 4.217
Hui Pan,Shuxia Wang,Xiaodong Wang,Chunhong Gong,Tao Ding
The near-spherical silica nanoparticles with polyvinyl alcohol (denoted as PVA-SiO 2 ) or polyethylene glycol (denoted as PEG-SiO 2 ) as surface modifiers were loaded onto graphene oxide nanosheets (denoted as GO) to prepare PVA(PEG)-SiO 2 -GO nanocomposites. The nanocomposites well dispersed in water were then compounded with maleic anhydride (MA) - acrylic acid (AA) copolymer (denoted as PMAAA) to prepare new nanocomposite tanning agents (denoted as PVA(PEG)-SiO 2 -GO/PMAAA). The hydrothermal stability, thickness increase, mechanical properties, flame retardancy and antistatic property, etc. of the leather tanned with PVA(PEG)-SiO 2 -GO/PMAAA were founded to be improved in a significant way compared with those of the leather tanned with the commercial acrylic resin (CHINATAN OM) and pure PMAAA copolymer tanning agents. The acquired excellent tanning properties may be related to the synergistic tanning effects of near-spherical silica nanoparticles and thin-layered graphene oxide nanosheets in leather tanning process. Especially, the highest shrinkage temperature of the wet-white sheepskin tanned with PVA-SiO 2 -GO/PMAAA reached 71 ◦ C and the thickness increase reached 190% without chrome tanning agents.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 33
·25959-25966
·
IF 3.84
Minhua Zhang,Meixiang Gao,Jianyue Chen,Yingzhe Yu
The structure and surface properties of the MgO/SiO2 catalyst were studied by both experimental characterization and the simulation method. The adsorption properties of ethanol on different MgO/SiO2 surfaces were researched by the density functional theory method and the result is that ethanol mainly adsorbed on MgO surface. The role of SiO2 in increasing the MgO crystal defects in the MgO/SiO2 has been obtained and the electronic properties of ethanol molecule before and after adsorption on the catalyst surfaces were compared. The initial step of ethanol dehydrogenation and the dehydration to 1,3-butadiene process, which is the dehydrogenation of ethanol to acetaldehyde reaction, on the flat sites, stepped sites and kinked sites was examined through the molecular simulation method. We investigated the preferable surface for the reaction of ethanol dissociation to an ethoxy group and the more active surface for the reaction of dehydrogenation of ethanol to acetaldehyde. The research results suggested that the stepped MgO surface is more active for the reaction of dehydrogenation of ethanol to acetaldehyde.
研究领域:
催化化学
·
计算化学
·
表面科学
·
材料化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·824-832
·
IF 3.502
Dashuang Ding,Yanlong Wang,Changgui Lin,Jing Ren,Wenbo Shi,Pengyuan Wang,Bing Yang,Shaoqian Zhang,Liping Duo
Incorporation of transition-metal ions (TMIs) in the precipitated nanocrystals (NCs) of glass-ceramics (GCs) greatly improves the photonic properties of these materials. The crystal field and coordination of TMIs show fingerprints for spectroscopic characterization. However, it is difficult to probe the effect of the host NCs’ structural phase on doped TMIs’ d-d orbitals. Herein, ZnF 2 :Ni and KZnF 3 :Ni based on controllable crystallization in KF-ZnF 2 -SiO 2 :Ni 2+ GCs were taken as model systems. Compared to ZnF 2 , perovskite-type KZnF 3 has higher binding energy Zn-F bonds in which Ni 2+ are easier to be segregated, which makes KZnF 3 :Ni be better “excited electron trapper” due to hole localization to intra-gap Ni states. These findings contribute to the understanding and design of TMIs-doped GCs in practical applications.
研究领域:
材料科学
·
光子学
·
固态化学
·
纳米材料
·
光学材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 7
·3910-3918
·
IF 2.936
Xiaotian Zhang,Yangyi Sun,Yijing Mao,Kunlin Chen,Zhihai Cao,Dongming Qi
This paper presents a simple and controllable method for the synthesis of monodisperse nanometer-sized organic–inorganic raspberry-like polystyrene (PS)–SiO2 nanocomposite particles (NCPs) via Pickering emulsion polymerization, by simply using a silane coupling agent, 3-(trimethoxysilyl)propyl methacrylate (MPS), as an auxiliary monomer and controlling its hydrolysis/condensation processes and amount. In this method, when MPS was stirred in acidic water with styrene (St) for a period of time, and then a basic silica solution added, raspberry-like PS–SiO2 NCPs were directly obtained after the polymerization. The whole process needs neither surface treatment for the silica particles nor additional surfactants or stabilizers. We propose that a silica-stabilized Pickering emulsion is formed through Si–OH reaction between the hydrolysis/condensation products of MPS distributed on the St droplets surface and the silica particles.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
Nanomanufacturing and Metrology
·
2023
·Vol. 6
·期 1
·1-10
·
IF 0
Chen Zanyu,Hu Jiugang,Ding Kuixing,Tan Jun,Hou Hongshuai,Ji Xiaobo
Titanium oxides have been considered promising anode materials for lithium-ion batteries (LIBs). However, the poor conductivity and low specific capacity of bulk titanium oxides limit their application. In this study, a carbon dot-modified TiO 2 @SiO 2 aerogel was successfully fabricated through a facile ambient pressure drying strategy and used as an anode material of LIBs. Benefiting from the crosslinking of carbon dots and the surface modification of SiO 2 , the as-prepared hierarchical aerogel exhibited a high initial discharge capacity of 974 mAh g −1 and maintained a capacity of 299 mAh g −1 after 100 cycles at 0.1 A g −1 . It also retained a discharge capacity of 111 mAh g −1 with a CE of 99.9% at 3 A g −1 . The carbon dot-modified cross-linking skeleton contributes to the structural integrity of the TiO 2 @SiO 2 aerogel during repeated insertion/extraction of lithium ions, guaranteeing outstanding cycling and high-rate performance. This ambient pressure drying strategy provides a facile and feasible way to produce high-performance aerogel anode materials for lithium-ion storage.
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）