检索结果-内蒙古大学图书馆

Vapor condensation with low air mass fraction inside water seal branch tube under free convection

Nuclear engineering and Design 2021年 379卷

作者： Bing Tan Xi Wang Y.W. Wu W.X. Tian S.Z. Qiu G.H. Su School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi an 710049 China School of Electric Power South China University of Technology Guangzhou 510640 China

The pressure vessel has used a newly designed water seal structure, and the sealed water is from condensation at low hydrogen concentration. To get the condensation capacity of the water seal branch tube under the pressure vessel normal operation, the experimental loop named WASETEL was constructed, which is aimed at studying the heat transfer during the process of air-steam mixture condensation inside the inclined branch tube at the condition of low air mass fraction. The inner tube is diameter 0.134 m with length 0.68 m which is connected with diameter 1.4 m, high 2.5 m pressure vessel. A canon camera was set to record the images and videos of the condensate height through glass tube in communicating vessel liquidometer. The experiment was conducted under the pressure ranged from 0.2 to 0.6 MPa, air mass concentration ranged from 0.49 to 6.42% and wall subcooling ranged from 11 to 40 K. The test showed HTC (heat transfer coefficient) would sharply deteriorate with the small air fraction, compared with pure steam condensation, about 0.49% mass fraction of the air will reduce heat transfer coefficient by 70–80%. When air concentration is relatively small, those widely used relations can not predict the condensation well, therefore, a new heat transfer empirical correlation with air mass fraction, pressure and subcooling is proposed, covered all the experimental data within the error band ±13%.

关键词： Natural condensation New empirical correlation Water seal

来源：评论

学校读者我要写书评

暂无评论

Observation of room-temperature ferroelectricity in elemental Te nanowires

arXiv

引用

arXiv 2022年

作者： Zhang, Jinlei Zhang, Jiayong Qi, Yaping Gong, Shuainan Zhao, Run Yang, Hongbin Wu, Zhenping Cui, Dapeng Wang, Lin Ma, Chunlan Gao, Ju Chen, Yong P. Jiang, Yucheng Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China Department of Engineering Science Faculty of Innovation Engineering Macau University of Science and Technology Av. Wai Long 999078 China Institute of Materials Science & Devices Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing100876 China Department of Physics Faculty of Science National University of Singapore Singapore117551 Singapore School of Materials Science and Engineering Shanghai University Shanghai200444 China School for Optoelectronic Engineering Zaozhuang University Shandong277160 China Department of Physics and Astronomy Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue Quantum Science and Engineering Institute Purdue University West LafayetteIN47907 United States Institute of Physics and Astronomy Villum Center for Hybrid Quantum Materials and Devices Aarhus University Aarhus-C8000 Denmark

Ferroelectrics are essential in low-dimensional memory devices for multi-bit storage and high-density integration. A polar structure is a necessary premise for ferroelectricity, mainly existing in compounds. However, it is usually rare in elemental materials, causing a lack of spontaneous electric polarization. Here, we report an unexpected room-temperature ferroelectricity in few-chain Te nanowires. Out-of-plane ferroelectric loops and domain reversal are observed by piezoresponse force microscopy. Through density functional theory, we attribute the ferroelectricity to the ion-displacement created by the interlayer interaction between lone pair electrons. Ferroelectric polarization can induce a strong field effect on the transport along the Te chain, supporting a self-gated field-effect transistor. It enables a nonvolatile memory with high in-plane mobility, zero supply voltage, multilevel resistive states, and a high on/off ratio. Our work provides new opportunities for elemental ferroelectrics with polar structures and paves a way towards applications such as low-power dissipation electronics and computing-in-memory devices. © 2022, CC BY.

关键词： Ferroelectricity

来源：评论

学校读者我要写书评

暂无评论

Atomically Dispersed Janus Nickel Sites on Red Phosphorus for Photocatalytic Overall Water Splitting

引用

Angewandte Chemie 2022年第29期134卷

作者： Menglong Wang Shuai Xu Prof. Zhaohui Zhou Prof. Chung-Li Dong Dr. Xu Guo Jeng-Lung Chen Dr. Yu-Cheng Huang Prof. Shaohua Shen Prof. Yubin Chen Prof. Liejin Guo Prof. Clemens Burda International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 China Chemical Engineering and Technology School of Water and Environment Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region Ministry of Education Chang'an University Xi'an 710064 China Department of Physics Tamkang University New Taipei City 25137 Taiwan National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Department of Chemistry Case Western Reserve University Cleveland OH 44106 USA

Single-atom nickel catalysts hold great promise for photocatalytic water splitting due to their plentiful active sites and cost-effectiveness. Herein, we adopt a reactive-group guided strategy to prepare atomically dispersed nickel catalysts on red phosphorus. The hydrothermal treatment of red phosphorus leads to the formation of P−H and P−OH groups, which behave as the reactive functionalities to generate the dual structure of single-atom P−Ni and P−O−Ni catalytic sites. The produced single-atom sites provide two different functions: P−Ni for water reduction and P−O−Ni for water oxidation. Benefitting from this specific Janus structure, Ni-red phosphorus shows an elevated hydrogen evolution rate compared to Ni nanoparticle-modified red phosphorus under visible-light irradiation. The hydrogen evolution rate was additionally enhanced with increased reaction temperature, reaching 91.51 μmol h −1 at 70 °C, corresponding to an apparent quantum efficiency of 8.9 % at 420 nm excitation wavelength.

关键词： Nickel Photocatalysis Red Phosphorus Single-Atom Catalysts Water Splitting

来源：评论

学校读者我要写书评

暂无评论

Quantitative Statistical Evaluation of Micro Residual Oil after Polymer Flooding Based on X-ray Micro Computed-Tomography Scanning

引用

Energy & Fuels 2020年第9期34卷 10762-10772页

作者： Yongfei Yang Liu Tao Stefan Iglauer S. Hossein Hejazi Jun Yao Wenjie Zhang Kai Zhang Key Laboratory of Unconventional Oil & Gas Development China University of Petroleum (East China) Ministry of Education Qingdao 266580 People’s Republic of China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 People’s Republic of China Petroleum Engineering School of Engineering Edith Cowan University Joondalup 6027 Western Australia Australia Porous Media Laboratory Department of Chemical and Petroleum Engineering University of Calgary Calgary Alberta Canada T2N 1N4

Polymer flooding is an important tertiary recovery method. However, even after its application, more than 50% of the oil remains in the formation layers. It is thus important for efficient resource use that both residual oil distribution and the mechanisms associated with polymer flooding are better understood. In the work described in this paper, a series of in situ X-ray tomography experiments were carried out, and different displacement stages were imaged. Then, rock, water, oil, and polymer were identified in the imagery and quantified, while interchanges among the different types of residual oil, and their associated microscopic polymer displacement mechanisms, were discussed. We also studied the impact of permeability on polymer flooding efficiency, and our results showed that polymer flooding could mobilize residual oil that was not accessible via water flooding. Mechanistically, the polymer flood caused the big continuous residual oil clusters to split, dispersing them into smaller clusters. The polymer also changed fluid flow pathways, thus increasing sweep efficiency, while its viscoelasticity was helpful for recovering singlet and film residual types of oil. We found that the polymer could only drive oil locally, and that a large amount of residual oil remained in the middle of the core. We also noted that polymer flooding was more effective for higher permeability samples, which showed that, after polymer flooding, the recovery rate for the samples with permeabilities of 3989, 1543, and 814 millidarcys (mD) were enhanced by 10.13, 6.30, and 4.34%, respectively. Higher permeability samples remained as network-type and multiple-type residual oils after polymer flooding, while samples with lower permeability showed multiple-type and singlet-type residual oils. Thus, our results and conclusions showed that different enhanced oil recovery methods could be applied for further development.

关键词： Saturation Lipids Cluster chemistry Permeability Polymers

来源：评论

学校读者我要写书评

暂无评论

Highly Efficient Electrocatalytic CO2Reduction to C2+Products on a Poly(ionic liquid)-Based Cu0–CuITandem Catalyst

引用

Angewandte Chemie 2021年第9期134卷

作者： Dr. Guo-Yi Duan Xiao-Qiang Li Guang-Rong Ding Prof. Dr. Li-Jun Han Prof. Dr. Bao-Hua Xu Prof. Dr. Suo-Jiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 China

Electroreduction of CO 2 on a polymer-modified Cu-based catalyst has shown high multi-electron reduction (>2 e − ) selectivity, however, most of the corresponding current densities are still too small to support industrial applications. In this work, we designed a poly(ionic liquid) (PIL)-based Cu 0 –Cu I tandem catalyst for the production of C 2+ products with both high reaction rate and high selectivity. Remarkably, a high C 2+ faradaic efficiency (FE ) of 76.1 % with a high partial current density of 304.2 mA cm −2 is obtained. Mechanistic studies reveal the numbers and highly dispersed Cu 0 -PIL-Cu I interfaces are vital for such reactivity. Specifically, Cu nanoparticles derived Cu 0 -PIL interfaces account for high current density and a moderate C 2+ selectivity, whereas Cu I species derived PIL-Cu I interfaces exhibit high activity for C−C coupling with the local enriched *CO intermediate. Furthermore, the presence of the PIL layer promotes the C 2+ selectivity by lowering the barrier of C−C coupling.

关键词： CO2 conversion Electrochemistry Ionic liquids Polymer modification Tandem catalyst

来源：评论

学校读者我要写书评

暂无评论

Surface Activation by Single Ru Atoms for Enhanced High-Temperature CO2Electrolysis

引用

Angewandte Chemie 2023年第5期136卷

作者： Dr. Yuefeng Song Junyong Min Yige Guo Rongtan Li Geng Zou Prof. Dr. Mingrun Li Dr. Yipeng Zang Weicheng Feng Dr. Xiaoqian Yao Dr. Tianfu Liu Dr. Xiaomin Zhang Jingcheng Yu Qingxue Liu Dr. Peng Zhang Prof. Dr. Runsheng Yu Prof. Dr. Xingzhong Cao Prof. Dr. Junfa Zhu Prof. Dr. Kun Dong Prof. Dr. Guoxiong Wang Prof. Dr. Xinhe Bao State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China University of Chinese Academy of Sciences Beijing 100039 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Multi-disciplinary Research Division Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

Cathodic CO 2 adsorption and activation is essential for high-temperature CO 2 electrolysis in solid oxide electrolysis cells (SOECs). However, the component of oxygen ionic conductor in the cathode displays limited electrocatalytic activity. Herein, stable single Ruthenium (Ru) atoms are anchored on the surface of oxygen ionic conductor (Ce 0.8 Sm 0.2 O 2-δ , SDC) via the strong covalent metal-support interaction, which evidently modifies the electronic structure of SDC surface for favorable oxygen vacancy formation and enhanced CO 2 adsorption and activation, finally evoking the electrocatalytic activity of SDC for high-temperature CO 2 electrolysis. Experimentally, SOEC with the Ru 1 /SDC-La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ cathode exhibits a current density as high as 2.39 A cm −2 at 1.6 V and 800 °C. This work expands the application of single atom catalyst to the high-temperature electrocatalytic reaction in SOEC and provides an efficient strategy to tailor the electronic structure and electrocatalytic activity of SOEC cathode at the atomic scale.

关键词： CO2 Electroreduction Electronic Structure Oxygen Vacancy Single Atom Catalyst Solid Oxide Electrolysis Cell

来源：评论

学校读者我要写书评

暂无评论

Sucrose pyrolysis assembling carbon nanotubes on graphite felt using for vanadium redox flow battery positive electrode

引用

Journal of Energy Chemistry 2018年第2期27卷 451-454页

作者： Haitao Yang Chuanlin Fan Qingshan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sdences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming 650093 Yunnan China

In the present paper, multi-walled carbon nanotubes（MWCNTs） are successfully assembled on graphite felt（GF） using sucrose pyrolysis method for the first time. The in situ formed pyrolytic carbon is chosen as the binder because it is essentially carbon materials as well as CNTs and GF which has a natural tendency to achieve high bonding strength and low contact resistance. The MWCNTs/GF electrode is demonstrated to increase surface area, reduce polarization, lower charge transfer resistance and improve energy conversion efficiency comparing with GF. This excellent electrochemical performance is mainly ascribed to the high electro-catalytic activity of MWCNTs and increasing surface area.

关键词： Vanadium redox flow batteries Multi-walled carbon nanotubes Sucrose pyrolysis Positive electrode materials Reversibility

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to: “One-pot synthesis of amorphous/crystalline SnO 2 /BaSO 4 composite sensitized with Eosin Y for enhanced photocatalytic H 2 production” [J. Environ. Chem. Eng. 12 (2024) 112770/JECE112770]

引用

Journal of Environmental Chemical engineering 2024年第5期12卷

作者： Cheng Cheng Jinfeng Zhang Haiping Jia Xutao Ding Gongyue Dong Feng Chen Yuchao Hu Jinwen Shi School of Chemical Engineering and Technology International Research Center for Renewable Energy (IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering (MFPE) Xi’an Jiaotong University (XJTU) 28 West Xianning Road Xi’an 710049 China Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs Xi’an Shiyou University Xi’an 710065 China Shaanxi Gas Group Fuping Energy Technology Co. Ltd 2 Kaiyuan Road Xi'an 710016 China Integrated Energy Institute Sichuan Digital Economy Industry Development Research Institute 88 Jiefang Road Chengdu 610036 China West Pipeline Company PipeChina 666 Beijing Middle Road Urumqi 830013 China School of Materials and Energy University of Electronic Science and Technology of China Chengdu 611731 China

来源：评论

学校读者我要写书评

暂无评论

Highly Purified Dicobalt Phosphide Nanodendrites on Exfoliated Graphene: in situ Synthesis and as Robust Bifunctional Electrocatalysts for Overall Water Splitting

Highly Purified Dicobalt Phosphide Nanodendrites on Exfoliat...

引用

中国化学会第十届全国无机化学学术会议

作者： Hui Liu Dong Chen Dan Ye Liu Hong Zhang Jun Yang State Key Laboratory of Multiphase Complex Systems and Center of Mesoscience Institute of Process Engineering Chinese Academy of Sciences

Designing highly active, earth-abundant and robust electrocatalysts with large surface areas and active sites, good electric conductivity, and minimization of gas bubble adhesion operated in the same electrolyte toward overall water splitting remains a potential challenge. Herein, we report an in situ synthesis of dendritic CoP nanostructures with high purity on exfoliated graphene（CoP/EG） showing superior performances toward both hydrogen evolution reaction（HER） and oxygen evolution reaction（OER）. The formation of CoP/CoO/Co（OH）x interfaces during electrocatalysis, abundant active sites featured by dendritic nanostructures, and fast electron transfer kinetics of EG as well as synergistic effects between active species and substrate would contribute to the improved catalytic performances for HER and OER. In specific, for the HER, the COP/EG shows excellent activity with a low overpotentials of 163 mV and 157 mV at 10 mA cm in 0.5 M HSO and 1.0 M KOH, respectively, while for the OER, it also exhibits high efficiency with an overpotential of 260 mV at 10 mA cm in 1.0 M KOH. Further, a CoP/EG||CoP/EG two-electrode alkaline electrolyzer affords a current density of 10 mA cm at a low cell voltage of 1.67 V, along with satisfied stability. An AA dry battery with a nominal voltage of 1.5 V can drive overall water splitting with obvious gas bubble release. Moreover, our synthetic approach might be applied for in situ synthesizing various metal phosphides/EG for electrolysis-based energy conversion.

关键词： Electrocatalyst Cobalt phosphide Hydrogen evolution reaction Oxygen evolution reaction Overall water splitting

来源：评论

学校读者我要写书评

暂无评论

Converting industrial waste contact masses into effective multicomponent copper-based catalysts for the Rochow process

引用

Particuology 2018年第2期16卷 1-8页

作者： Hezhi Liu Yongjun Ji Yongxia Zhu Guangna Wang Xueguang Wang Ziyi Zhong Fabing Su State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering Shanghai University Shanghai 200072 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Institute of Chemical and Engineering Sciences Agency for Science Technology and Research (A＊STAR) 1 Pesek Road Jurong Island 627833 Singapore

In this work, we report a simple and inexpensive approach to synthesize effective multicomponent Cu-Cu2O-CuO catalysts for the Rochow process from industrial waste contact masses （WCMs）. WCMs from the organosilane industry were treated with acid followed by reduction with metallic iron powder. The obtained copper powder was then subjected to controlled oxidation in air at different temperatures, followed by ball milling. The orthogonal array approach was applied to optimize this process, and the stirring speed and pH were found to significantly affect the leaching ratio and copper yield, respectively. When used for the Rochow process, the optimized ternary Cu-Cu2O-CuO catalyst greatly enhanced the dimethyldichlorosilane selectivity and Si conversion compared with Cu-Cu2O-CuO catalysts prepared without ball milling, bare Cu catalysts, and Cu-Cu2O-CuO catalysts with different compositions. This could be attributed to their small particle size and the strong synergistic effect among the multiple components in the catalyst with the optimized composition.

关键词： Acid leaching Controlled synthesis Solid Waste Copper-based catalyst Rochow reaction

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：