检索结果-内蒙古大学图书馆

Probing conducting polymers@cadmium sulfide core-shell nanorods for highly improved photocatalytic hydrogen production

引用

Journal of colloid and interface science 2018年 521卷 1-10页

作者： Chao Wang Zhi-Yi Hu Heng Zhao Wenbei Yu Sijia Wu Jing Liu Lihua Chen Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Loushi Road 122 Wuhan 430070 China. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Loushi Road 122 Wuhan 430070 China NRC (Nanostructure Research Centre) Wuhan University of Technology Luoshi Road 122 430070 China. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Loushi Road 122 Wuhan 430070 China. Electronic address: yu.li@***. Laboratory of Inorganic Materials Chemistry University of Namur rue de Bruxelles 61 Namur B-5000 Belgium Clare Hall University of Cambridge Herschel Road Cambridge CB3 9AL United Kingdom.

We report three types of conducting polymers (CPs), polyaniline (PANI), polypyrrole (PPY) and poly (3,4-ethylenedioxythiophene) (PEDOT) to modify the surface of the CdS nanorods to probe their photocorrosion inhibition and photocatalytic hydrogen production. Various characterizations, such as high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and density function theory (DFT) calculations have been conducted to reveal the intrinsic structure of the as-constructed CPs@CdS (@ means CPs at the surface of CdS) core-shell nanorods. The results show that the PANI and PPY shells with abundant N and C atoms can significantly enhance the binding energy of Cd and S atoms on the surface of the CdS nanorods. However, there is no obvious enhancement of binding energy at the interface of the PEDOT shell and the CdS nanorods core. Therefore, PANI@CdS and PPY@CdS possess stronger driving force than PEDOT@CdS to inject the photogenerated holes in conducting polymer shells. As a result, the polyaniline (PANI) modified PANI@CdS core-shell nanorods demonstrate the most effectively enhanced hydrogen production rate of ∼9.7 mmol h g and effective photocorrosion inhibition in 30 h without deactivation under visible-light irradiation. The hydrogen production performance of PPY@CdS is not effectively promoted owing to the weak transmittance of light for the PPY shell. The PEDOT shell cannot improve the hydrogen production and stability property of the CdS nanorods. This work could shed some light on conducting polymers modifying metal sulfides nanostructures that is of inconceivable significance for effective photocorrosion inhibition and highly enhanced photocatalytic activities.

关键词： CdS nanorods Conducting polymers Core-shell structure Photocatalytic H(2) production Photocorrosion inhibition

来源：评论

学校读者我要写书评

暂无评论

Aerosol synthesis of trivalent titanium doped titania/carbon composite microspheres with superior sodium storage performance

引用

Nano Research 2017年第12期10卷 4351-4359页

作者： Doudou Guan Qiang Yu Chang Xu Chunjuan Tang Liang Zhou Dongyuan Zhao Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Department of Mathematics and Physics Luoyang Institute of Science and Technology Luoyang 471023 China Department of Chemistry University of California Berkeley California 94720 USA

Trivalent titanium doped titania/carbon （TiO2-x/C） composite microspheres have been prepared by a facile aerosol method （ultrasonic spray pyrolysis） using titanium （W） bis（ammonium lactato）dihydroxide （TiBALDH） as the sole precursor. The obtained TiO2-x/C microspheres have particle sizes in the range of 400-1,000 nm. When evaluated as anode material for sodium-ion batteries （SIBs）, they provide a high reversible capadty of 286 mA-h.g-1 with good cycling performance. A capacity of 249 mA-h-g-1 can be achieved after 180 cycles at 50 mA.g-1, which is more than three times higher than that of white TiO2 microspheres （77 mA.h.g-1）. The superior sodium storage performance of these TiO2-x/C composite microspheres can be attributed to the simultaneous introduction of Ti3＋ and oxygen vacancies, ultrafine grain size, as well as the conductive carbon matrix. This study provides a facile and effective approach for the production of TiO2-x/C nanocomposites with superior sodium storage performance.

关键词： titania aerosol synthesis doping sodium storage nanocomposite

来源：评论

学校读者我要写书评

暂无评论

Novel synthesis approaches for new structures in confined space inspired by natural structure-forming processes

引用

Journal of Materiomics 2017年第2期3卷 83-95页

作者： Hang Ping Hao Xie Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineeringand Life ScienceWuhan University of TechnologyWuhan430070China

In living organisms,confined space with specific chemical composition and elab.rate spatial distribution regulates the formation of natural *** from the natural structure-forming process,novel synthesis approaches in deliberated confined systems have been proposed for obtaining designed *** confined systems can effectively regulate the synthesis of materials with defined structures according to the geometry of *** fibrils provide biological confinements for the formation of hierarchical structure with periodic *** engineered living organisms with designed confinements can direct the synthesis of three-dimensional *** novel structures will be rationally fabricated in the future with the aid of deeper understanding of biological processes.

关键词： Bioprocess-inspired fabrication Natural structure-forming processes Confined space New structures

来源：评论

学校读者我要写书评

暂无评论

Design of Multi-Shelled Hollow Cr2O3Spheres for Metabolic Fingerprinting

引用

Angewandte Chemie 2021年第22期133卷

作者： Rongxin Li Dr. Yongjie Zhou Dr. Chao Liu Congcong Pei Weikang Shu Chaoqi Zhang Prof. Lianzhong Liu Prof. Liang Zhou Prof. Jingjing Wan School of Chemistry and Molecular Engineering East China Normal University Shanghai 200241 P. R. China Department of Psychiatric Rehabilitation Shenzhen Kangning Hospital Shenzhen Guangdong 518118 P. R. China Wuhan Mental Health Center Tongji Medical College of Huazhong University of Science and Technology Wuhan Hubei 430032 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 P. R. China

Schizophrenia (SZ) detection enables effective treatment to improve the clinical outcome, but objective and reliable SZ diagnostics are still limited. An ideal diagnosis of SZ suited for robust clinical screening must address detection throughput, low invasiveness, and diagnosis accuracy. Herein, we built a multi-shelled hollow Cr 2 O 3 spheres (MHCSs) assisted laser desorption/ionization mass spectrometry (LDI MS) platform for the direct metabolic profiling of biofluids towards SZ diagnostics. The MHCSs displayed strong light absorption for enhanced ionization and microscale surface roughness with stability for the effective LDI of metabolites. We profiled urine and serum metabolites (≈1 μL) with the enhanced LDI efficacy in seconds. We discriminated SZ patients (SZs) from healthy controls (HCs) with the highest area under the curve (AUC) value of 1.000 for the blind test. We identified four compounds with optimal diagnostic power as a simplified metabolite panel for SZ and demonstrated the metabolite quantification for clinic use. Our approach accelerates the growth of new platforms toward a precision diagnosis in the near future.

关键词： in vitro diagnostics (IVD) mass spectrometry metabolites multi-shelled hollow spheres schizophrenia

来源：评论

学校读者我要写书评

暂无评论

An Anomalous Electron Configuration Among 3dTransition Metal Atoms

引用

Angewandte Chemie 2022年第7期135卷

作者： Zhexin Tang Tongtong Shang Han Xu Ting Lin Ang Gao Weiguang Lin Xinyan Li Shiyu Wang Botao Yu Fanqi Meng Qinghua Zhang Xuefeng Wang Dong Su Qingbo Meng Lijun Wu Lin Gu Ce-Wen Nan Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences 100190 Beijing P. R. China School of Physical Sciences University of Chinese Academy of Sciences 100049 Beijing P. R. China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University 100084 Beijing P. R. China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University 100084 Beijing P. R. China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences 100049 Beijing P. R. China Condensed Matter Physics and Materials Science Division Brookhaven National Laboratory 11973 Upton NY USA

Physical properties of materials are mainly determined by valence electron configurations, where different valence shells would induce divergent phenomena. In compounds containing Sc 2+ , 3 d electron occupancy is expected, the same as other transition metal atoms like Ti 3+ . But this situation still awaits experimental verification in inorganic materials. Here, we selected ScS to measure the valence electron density and orbital population of Sc 2+ through delicate quantitative convergent-beam electron diffraction. With the absence of 3 d orbital features around Sc-atom sites and the nearly bare population of t 2g orbital, the unintuitive occupation of 4 s orbital in Sc 2+ is concluded. It should be the first time to report such a special electron configuration in a transition metal compound, in which 4 s rather than 3 d orbital is preferred. Our findings reveal the distinct behavior of Sc and probable ways to modulate material properties by controlling electron orbitals.

关键词： Electron Configuration Electron Density Distribution Electron Microscopy Quantitative Convergent-Beam Electron Diffraction Scandium

来源：评论

学校读者我要写书评

暂无评论

Dynamic Restructuring of Coordinatively Unsaturated Copper Paddle Wheel Clusters to Boost Electrochemical CO2Reduction to Hydrocarbons**

引用

Angewandte Chemie 2021年第3期134卷

作者： Dr. Wei Zhang Chuqiang Huang Jiexin Zhu Qiancheng Zhou Ruohan Yu Yali Wang Dr. Pengfei An Prof. Jing Zhang Prof. Ming Qiu Prof. Liang Zhou Prof. Liqiang Mai Prof. Zhiguo Yi Prof. Ying Yu Institute of Nanoscience and Nanotechnology College of Physical Science and Technology Central China Normal University Wuhan 430079 Hubei P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei P. R. China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Science Beijing 100049 P. R. China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P. R. China

The electrochemical reduction of CO 2 to hydrocarbons involves a multistep proton-coupled electron transfer (PCET) reaction. Second coordination sphere engineering is reported to be effective in the PCET process; however, little is known about the actual catalytic active sites under realistic operating conditions. We have designed a defect-containing metal–organic framework, HKUST-1, through a facile “atomized trimesic acid” strategy, in which Cu atoms are modified by unsaturated carboxylate ligands, producing coordinatively unsaturated Cu paddle wheel (CU−CPW) clusters. We investigate the dynamic behavior of the CU−CPW during electrochemical reconstruction through the comprehensive analysis of in situ characterization results. It is demonstrated that Cu 2 (HCOO) 3 is maintained after electrochemical reconstruction and that is behaves as an active site. Mechanistic studies reveal that CU−CPW accelerates the proton-coupled multi-electron transfer (PCMET) reaction, resulting in a deep CO 2 reduction reaction.

关键词： catalytic active sites CO2 reduction Cu paddle wheel electrocatalysts

来源：评论

学校读者我要写书评

暂无评论

Expansion of Linear Analysis of Rayleigh-Taylor Interface Instability of Metal materials

引用

World Journal of Mechanics 2018年第4期8卷 94-106页

作者： Xinbo Bai Tao Wang Yuxuan Zhu Guoqiang Luo College of Physical Science and Technology Sichuan University Chengdu China Institute of Fluids Physics China Academy of Engineering Physics Mianyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

The linear analysis of the Rayleigh-Taylor instability in metal material is extended from the perfect plastic constitutive model to the Johnson-Cook and Steinberg-Guinan constitutive model, and from the constant loading to a time-dependent loading. The analysis is applied to two Rayleigh-Taylor instability experiments in aluminum and vanadium with peak pressures of 20 GPa and 90 GPa, and strain rates of 6 × 106 s−1 and 3 × 107 s−1 respectively. When the time-dependent loading and the Steinberg-Guinan constitutive model are used in the linear analysis, the analytic results are in close agreement with experiments quantitatively, which indicates that the method in this paper is applicable to the Rayleigh-Taylor instability in aluminum and vanadium metal materials under high pressure and high strain rate. From these linear analyses, we find that the constitutive models and the loading process are of crucial importance in the linear analysis of the Rayleigh-Taylor instability in metal material, and a better understanding of the Rayleigh-Taylor instability in metals is gained. These results will serve as important references for evolving high-pressure, high-strain-rate experiments and numerical simulations.

关键词： Linear Analysis Rayleigh-Taylor Instability Time-Dependent Loading Constitutive Model

来源：评论

学校读者我要写书评

暂无评论

Cascade electronic band structured zinc oxide/bismuth vanadate/three-dimensional ordered macroporous titanium dioxide ternary nanocomposites for enhanced visible light photocatalysis

引用

Journal of colloid and interface science 2019年 539卷 585-597页

作者： Heng Zhao Meryam Zalfani Chao-Fan Li Jing Liu Zhi-Yi Hu Mounira Mahdouani Ramzi Bourguiga Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road 122 430070 Wuhan Hubei China. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium Laboratoire de Physique des Matériaux: Structure et Propriétés Groupe Physique des Composants et Dispositifs Nanométriques Faculté des Sciences de Bizerte University of Carthage 7021 Jarzouna-Bizerte Tunisia. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road 122 430070 Wuhan Hubei China Nanostructure Research Centre (NRC) Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium. Nanostructure Research Centre (NRC) Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China. Electronic address: yu.li@***. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium Clare Hall University of Cambridge Herschel Road Cambridge CB3 9AL United Kingdom.

Ternary zinc oxide/bismuth vanadate/three-dimensional ordered macroporous titanium dioxide (ZnO/BiVO/3DOM TiO) heterojuncted nanocomposites with cascade electronic band structures were successfully designed and synthesized for visible light photodegradation of two different molecules: Rhodamine B (RhB) and Tartrazine. The photocatalytic active species have been investigated by using electron scavenger (AgNO) and hole scavenger (Triethanolamine: TEOA). The band edge positions of each component in tenary nanocomposites have been measured by using photoelectrochemical Mott-Schottky method and valence band XPS (VB-XPS) spectroscopy. Within the heterojunction, charges are favorably and spatially separated through the gradient potential at the interfaces. This largely suppresses the recombination of photogenerated electrons and holes. Furthermore, 3DOM inverse opal structure is beneficial for high diffusion efficiency and highly accessible surface area of reactants and light and multiple scattering for light harvesting. Consequently, these heterojuncted nanocomposites exhibit highly enhanced photocatalytic performance compared with pure BiVO nanostructure, and binary BiVO/3DOM TiO, ZnO/BiVO nanocomposites. A detailed mechanism of charge transfer is proposed for these ternary ZnO/BiVO/3DOM TiO nanocomposites on the basis of a large series of spectroscopic and photocatalytic results. Our work demonstrates clearly that coupling multicomponent semiconductors with different energy levels of conduction and valence bands can significantly increase the photogenerated charge carriers through the efficient charge separation across their multiple interfaces. This work gives some new ideas on developing new visible light responsive nanocomposites for highly efficient solar energy utilization.

关键词： Heterojunction structures Photogenerated electron–hole pairs RhB and tartrazine Ternary ZnO/BiVO(4)/3DOM TiO(2) nanocomposites Visible light

来源：评论

学校读者我要写书评

暂无评论

Preparation and Characterization of Magnetic Gd3+ Doped Hydroxyapatite Nanoparticles

引用

IOP Conference Series: materials Science and Engineering 2019年第1期678卷

作者： Zhuozhi Ruan Xiaojun Zhang Qingguo Xing Yingchao Han State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan 430070 China

Hydroxyapatite (HAP), the major inorganic composition of mammal bones, has good biocompatibility, biological activity and osteoconductivity. Gadolinium(Gd) with seven unpaired electron on 4f orbit can be used for MRI contrast agent due to its large electron spin magnetic moment and relaxivity. In this study, the magnetic Gd3+ doped HAP nanoparticles (Gd-nHAP) were synthesized via coprecipitation method. Results showed that the magnetization of Gd-nHAP was gradually enhanced along with the increase of doping content of Gd3+, which indicated magnetic property depended on doping content. Moreover, with a fixed doping content of Gd3+, the increase of reaction temperature (60°C-280°C) did not generate significant effect on magnetization of synthesized Gd-nHAP. The result showed that magnetization of Gd3+ has no strong correlation with crystallinity and crystalline size of HAP.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Hollow nitrogen-doped carbon/ [email protected] 2 nanocomposite with structural and chemical dual-encapsulation for lithium-sulfur battery

引用

Chemical Engineering Journal 2020年 381卷

作者： Hao Chen Wen-Da Dong Fan-Jie Xia Yun-Jing Zhang Min Yan Jian-Ping Song Wei Zou Yang Liu Zhi-Yi Hu Jing Liu Yu Li Hong-En Wang Li-Hua Chen Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Nanostructure Research Centre (NRC) Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium

Although lithium-sulfur (Li-S) batteries are one of the most promising energy storage systems, the low electrical conductivity of sulfur, the serious shuttle of the dissolved lithium polysulfides (LiPSs) and the large volume change during cycling greatly hinder the practical application of Li-S batteries. To overcome these issues, we report the in situ growing MnO 2 nanosheets on the hollow nitrogen-doped micropore-rich carbon (NMRC) to form NMRC/ [email protected] 2 nanocomposite with high sulfur content for advanced Li-S battery. The hollow nonpolar micropore-rich carbon nanospheres not only provide effectively structural confinement for active species but also accommodate the volume change during the charge–discharge process. The polar MnO 2 nanosheets and doped nitrogen present strong chemisorption for LiPSs. Consequently, the synergistic dual-encapsulation from structural confinement and chemisorption makes the NMRC/ [email protected] 2 nanocomposite has a theoretical sulfur loading of 72% and exhibit a high initial specific capacity of 1144 mAh·g −1 and a reversible capacity of 1023 mAh·g −1 after 200 cycles at 0.2 C. Even after 1000 cycles at 2.0 C, a capacity of 590 mAh·g −1 is maintained, among the best results for Li-S batteries. Our work reveals that the carefully design of sulfur-based composites with structural and chemical dual-encapsulation is promising to push forward the practical implementation of Li-S batteries.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：