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Two-dimensional Cu-porphyrin nanosheet membranes for nanofiltration

Nano Research 2023年第5期16卷 6290-6297页

作者： Jiahao Cai Shizheng Song Lijie Zhu qipeng lu Zong lu Yanying Wei Haihui Wang School of Chemistry&Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510640China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

A kind of two-dimensional(2D)metal-organic framework(MOF)material,Cu-meso-tetrakis(4-carboxyphenyl)porphine(Cu-TCPP)nanosheets with wrinkled and flat morphologies are used as building blocks to assemble membranes by vacuum filtration(VF)and electrophoretic deposition(EPD)as energy-efficient nanofiltration(NF)membranes to remove dyes from *** the nanosheets with wrinkled structure can provide additional water transport channels,thereby increasing the water permeance,in the premise of a high rejection(>97.0%)for the dye brilliant blue G(BBG)(1.60 nm×1.90 nm),the water permeance of the membrane assembled by the wrinkled nanosheets(~1170 nm)is about 4 times that of the membrane assembled by the flat nanosheets(~530 nm),reaching 16.39 L·m^(−2)·h^(−1)·bar^(−1).Additionally,the use of the relatively flat nanosheets and the membrane preparation method of electrophoretic deposition is more conducive to stack nanosheets orderly and reduce ***,the water permeance of the membrane prepared by EPD(~1170 nm)with flat nanosheets is about twice that of the membrane prepared by VF(~530 nm),achieving 9.40 L·m^(−2)·h^(−1)·bar^(−1)with similar rejection(>97.0%)of dye evans blue(EB)(3.10 nm×1.20 nm).Furthermore,these membranes still exhibit good separation performance at high pressure of 0.6 *** with diverse structures and various membrane fabrication processes provide new directions for the separation performance optimization of 2D MOF materials for water purification.

关键词： two-dimensional material membrane metal-organic framework(MOF) nanofiltration nanosheet morphology electrophoretic deposition

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Editorial for special issue on renewable energy conversion,utilization and storage

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International Journal of Minerals,Metallurgy and Materials 2023年第10期30卷 1855-1858页

作者： qipeng lu Zhihong Du Jie Wang Wenbin Cao Hailei Zhao School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

*** In light of the rapid depletion of fossil energy resources and the escalating environmental pollution crisis,there has been a significant surge in research focused on the development of technologies and materials for renewable energy conversion,utilization,and *** research area has gained paramount importance in addressing the pressing challenges of our time.

关键词： gained energy depletion

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Graded interface engineering of 3D/2D halide perovskite solar cells through ultrathin(PEA)_(2)PbI_(4) nanosheets

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Chinese Chemical Letters 2021年第7期32卷 2259-2262页

作者： Lijie Zhu qipeng lu Chunhai Li Yue Wang Zhenbo Deng Key Laboratory of luminescence and Optical Information Ministry of EducationBeijing JiaoTong UniversityBeijing 100044China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

2D halide perovskites have emerged as promising materials because of their stability and passivation effect in perovskite solar cells(PSCs).However,the introduction of bulky organic ammonium cations from 2D halide perovskites would decrease the device performance generally compared to the traditional 3D MAPbI_(3).Incorporation of ultrathin 2D halide perovskite nanosheets(NSs)with 3D MAPbI_(3)could address this ***,we re port a rationally designed PSCs with dimensional graded 3D/2D MAPbI_(3)/(PEA)_(2)PbI_(4)heterojunction,in which 2D(PEA)_(2)PbI_(4)NSs were synthesized and incorporated between 3D MAPbI_(3)and hole-transporting *** the significantly improved stability,a notable increasement in power conversion efficiency(PCE)of 20%was obtained for the 3D/2D perovskite solar cells due to the favourable band alignment among(PEA)_(2)PbI_(4)NSs and the other *** graded structure of MAPbI_(3)/(PEA)_(2)PbI_(4)would upshift the energy level continuously,which enhances the hole extraction efficiency thus reduces the interface charge recombination,leading to the increasements of VOC from1.04 V to 1.07 V,Jsc from 21.81 mA/cm^(2) to 23.15 mA/cm^(2) and the fill factor from 67.89% to 74.78%,and therefore an overall PCE of 18.53%.

关键词： Interface engineering Perovskite solar cell Two-dimensional perovskite Hole extraction layer Band alignment

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Synthesis of Cu–TiO2/CuS p-n heterojunction via in situ sulfidation for highly efficient photocatalytic NO removal

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Progress in Natural Science:Materials International 2022年第5期32卷 561-569页

作者： Faguo Wang Shuo Yang Sumei Han Peng Sun Wenxiu Liu qipeng lu Wenbin Cao School of Materials Science and Engineering University of Science and Technology Beijing Institute of Urban Safety and Environmental Science Beijing Academic of Science and Technology

Cu doped TiO2/CuS(Cu–TiO2/CuS) p-n heterojunction was synthesized via in situ sulfidation method for efficient photocatalytic removal of NO at ppb-level. The results show that optimized Cu–TiO2/CuS heterojunction possessed a maximum efficiency of 85% for the removal of NO under visible light irradiation, which was approximately 8.5, 4.3 and 1.2 times that of CuS, TiO2and Cu–TiO2, respectively. The improved photocatalytic performance is attributed to the enhancement of visible light absorption and charge carrier separation induced by the construction of p-n heterojunction. Meanwhile, the p-n heterojunction charge transfer mechanism of Cu–TiO2/CuS was verified by systematic investigations. The appropriate band structures of the two components and the internal electric field formed at the interface of the heterojunction were two factors for this charge transfer mechanism. Furthermore, the role of active species in NO removal was explored, and the corresponding mechanism for NO removal of the heterojunction was proposed. This work provides a promising approach for the synthesis of heterojunction photocatalysts and facilitates the application of photocatalysts in sustainable and efficient pollutant removal.

关键词： Cu doped TiO2/CuS p-n heterojunction In situ sulfidation Visible light NO removal

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Recent advances of Rh-based intermetallic nanomaterials for catalytic applications

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Chinese Chemical Letters 2023年第11期34卷 52-62页

作者： Lijie Zhu Chunhai Li Qinbai Yun Sumei Han Yong Lv qipeng lu Junze Chen School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China Department of Chemistry City University of Hong KongHong KongChina School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China Zhongguancun Institute of Human Settlements Engineering and Materials Beijing 100083China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Rhodium(Rh)has received widespread attention in fundamental catalytic research and numerous industrial catalytic *** to homogeneous catalysts,Rh-based nanomaterials as heterogeneous catalysts are much easier to separate and collect after usage,making them more suitable for commercial *** this purpose,there has been a constant demand in constructing stable and highly active Rh-based *** contrast to Rh-based solid solutions with a random distribution of metallic atoms in the lattice,Rh-based intermetallic compounds(IMCs)with a fixed stoichiometric ratio and an ordered atomic arrangement can ensure the homogenous distribution of active sites and structural stability in the catalytic *** this review,we concentrate on the fabrication of Rh-based IMCs for catalytic *** synthetic methods and protocols for the controlled preparation of Rh-based IMC are ***,the catalytic applications and corresponding catalytic mechanisms are *** addition,personal perspectives about the remaining challenges and prospects in this field are *** believe this review will be useful in directing the development of Rh-based IMC catalysts for heterogeneous catalysis.

关键词： Rhodium Internetallics Heterogeneous catalysis Electrocatalysis

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Implementation of effective control system for variable-included angle plane-grating monochromator

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Nuclear Science and Techniques 2011年第1期22卷 9-12页

作者： LIU Ping WANG Yong TAI Renzhong XUE Song lu qipeng ZHENG Lifang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

The variable-included angle plane-grating monochromator is a homemade key equipment of the scanning transmission X-ray microscopy (STXM) beamline at Shanghai Synchrotron Radiation Facility (SSRF).Monochromatic light of various wavelengths is achieved by an effective control system that handles the rotation of the plane mirror and plane grating mounted in a high vacuum *** made by PI *** used as motion stage which has a DC servo motor controlled by a C862 controller based on RS232 *** software platform of STXM is EPICS,so the local control functions are implemented by LabVIEW program to satisfy physics *** the remote control functions,the program is integrated into EPICS with *** tests show that the repeat precision of motion control is less than 0.2μm,which meets the control demand.

关键词：光栅单色仪控制系统平面镜夹角可变上海同步辐射装置远程控制功能直流伺服电动机

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Crystal Phase-Based Epitaxial Growth of Noble Metal Nanostructures

Crystal Phase-Based Epitaxial Growth of Noble Metal Nanostru...

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中国化学会第十届全国无机化学学术会议

作者： qipeng lu School of Materials Science and Engineering University of Science and Technology Beijing

Crystal phase engineering offers opportunities for the rational design and synthesis of noble metal nanomaterials with unusual crystal phases which normally do not exist in bulk materials. However, it remains a challenge to use these materials as seeds to construct heterometallic nanostructures with desired crystal phases and morphologies for promising applications such as catalysis. This presentation will provide a strategy for the synthesis of binary and ternary hybrid noble metal nanostructures. The synthesized crystal-phase heterostructured 4 H/fcc Au nanowires(NWs) enable the epitaxial growth of Ru nanorods(NRs) on the 4 H phase and fcc-twin boundary in Au NWs, resulting in hybrid Au-Ru NWs. Moreover, the method can be extended to the epitaxial growth of Rh, Ru-Rh, and Ru-Pt NRs on the 4 H/fcc Au NWs to form unique hybrid NWs. Based on the obtained hybrid nanostructures, hierarchical 4 H/fcc Ru nanotubes(NTs) could be synthesized by a hard template-mediated method, in which 4 H/fcc Au nanowires(NWs) served as sacrificial templates which were then etched by copper ions(Cu) in dimethylformamide. The obtained hierarchical 4 H/fcc Ru NTs contain ultrathin Ru shells(5-9 atomic layers) and tiny Ru nanorods(NRs) with length of 4.2 ± 1.1 nm and diameter of 2.2 ± 0.5 nm vertically decorated on the surface of Ru shells. As an electrocatalyst for the hydrogen evolution reaction(HER) in alkaline media, the hierarchical 4 H/fcc Ru NTs exhibit excellent electrocatalytic performance, which is better than 4 H/fcc Au-Ru NWs, commercial Pt/C, Ru/C and most of the reported electrocatalysts.

关键词： Crystal phase Epitaxial growth Noble metal Nanostructure

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Crystal facet-dependent electrocatalytic performance of metallic Cu in CO_(2)reduction reactions

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Chinese Chemical Letters 2022年第8期33卷 3641-3649页

作者： Hao Zhang Caihong He Sumei Han Zeyang Du Ling Wang Qinbai Yun Wenbin Cao Bowei Zhang Ya-Hui Tian qipeng lu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Department of Chemistry City University of Hong KongHong KongChina Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Institute of Acoustics Chinese Academy of SciencesBeijing 10019China

Developing high-performance electrocatalysts for CO_(2) reduction reaction(CO_(2)RR)is crucial since it is beneficial for environmental protection and the resulting value-add chemical products can act as an alternative to fossil ***,the direct reduction of CO_(2) into long-chain hydrocarbons and oxygenated hydrocarbons with high selectivity remains ***(Cu)shows a distinctive advantage that it is the only pure metal catalyst for reducing CO_(2) into multi-carbon(C_(2+))products and the certain facets(e.g.,(100),(111),(111))of Cu nanocrystals exhibit relatively low energy barriers for the formation of specific products(e.g.,CO,HCOOH,CH_(4),C_(2)H_(4),C_(2)H_(5)OH,and other C_(2+) products).Therefore,extensive studies have been carried out to explore the relationship between the facets of Cu nanocrystals and corresponding catalytic *** this review,we will discuss the crystal facet-dependent electrocatalytic CO_(2)RR performance in metallic Cu catalysts,meanwhile,the detailed reaction mechanisms will be systematically *** addition,we will provide a personal perspective for the future research directions in this emerging *** believe this review is helpful to guide the design of high-selectivity Cu-based electrocatalysts for CO_(2)RR.

关键词： Copper CO_(2)electrochemical reduction Crystal facet-dependence Electrocatalysts

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Aging amorphous/crystalline heterophase PdCu nanosheets for catalytic reactions

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National Science Review 2019年第5期6卷 955-961页

作者： Hongfei Cheng Nailiang Yang Xiaozhi Liu Qinbai Yun Min Hao Goh Bo Chen Xiaoying Qi qipeng lu Xiaoping Chen Wen Liu Lin Gu Hua Zhang Center for Programmable Materials School of Materials Science and EngineeringNanyang Technological University State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Singapore Institute of Manufacturing Technology A*STAR School of Materials Science and Engineering University of Science and Technology Beijing School of Chemical and Biomedical Engineering Nanyang Technological University Songshan Lake Materials Laboratory Department of Chemistry City University of Hong Kong

Phase engineering is arising as an attractive strategy to tune the properties and functionalities of *** particular, amorphous/crystalline heterophase nanostructures have exhibited some intriguing ***, the one-pot wet-chemical synthesis of two types of amorphous/crystalline heterophase Pd Cu nanosheets is reported, in which one is amorphous phase-dominant and the other one is crystalline *** the aging process of the synthesized Pd Cu nanosheets is studied, during which their crystallinity increases, accompanied by changes in some physicochemical *** a proof-of-concept application, their aging effect on catalytic hydrogenation of 4-nitrostyrene is *** a result, the amorphous phase-dominant nanosheets initially show excellent *** aging for 14 days, their catalytic activity is higher than that of crystalline phase-dominant *** work demonstrates the intriguing properties of heterophase nanostructures, providing a new platform for future studies on the regulation of functionalities and applications of nanomaterials by phase engineering.

关键词： amorphous/crystalline heterophase nanosheets aging selective hydrogenation catalysis

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X射线干涉光刻光束线关键光学元件热-结构耦合分析

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仪器仪表学报 2015年第10期36卷 2347-2354页

作者：龚学鹏卢启鹏中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室长春130033

为了保证上海光源X射线干涉光刻光束线的稳定性,减小热变形对实验结果的影响,对X射线干涉光刻光束线的3个关键光学元件——偏转镜、聚焦镜和精密四刀狭缝进行热-结构耦合分析。首先,计算偏转镜、聚焦镜和精密四刀狭缝所承载的功率密度;... 详细信息

为了保证上海光源X射线干涉光刻光束线的稳定性,减小热变形对实验结果的影响,对X射线干涉光刻光束线的3个关键光学元件——偏转镜、聚焦镜和精密四刀狭缝进行热-结构耦合分析。首先,计算偏转镜、聚焦镜和精密四刀狭缝所承载的功率密度;然后,建立其有限元模型;最后,获得光学元件的温度场和热变形的结果。结果表明,偏转镜和聚焦镜采用间接水冷方式可有效抑制热变形,冷却后的最大面形误差分别为7.2μrad和9.2μrad。精密四刀狭缝未冷却时,刀片组件温度介于271.56~273.27℃,刀口热变形为0.19 mm,直线导轨热变形为0.08 mm;经过铜辫子冷却后,刀片组件温度降至22.24~23.94℃,刀口热变形降至0.2μm,直线导轨热变形降至0.1μm;采用影像法和接触探头法测试后,刀口直线度、平行度和重复精度均满足技术要求。偏转镜、聚焦镜和精密四刀狭缝的热变形通过间接水冷和铜辫子的冷却方式可以得到很大程度的抑制,进而保证光斑质量。

关键词： X射线干涉光刻热分析数值模拟同步辐射

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