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Confined cobalt single-atom catalysts with strong electronic metal-support interactions based on a biomimetic self-assembly strategy

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Carbon Energy 2024年第9期6卷 156-171页

作者： Bowen Guo Zekun Wang Lei Zheng Guang Mo Hongjun Zhou Dan Luo State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Biogas Upgrading UtilizationCollege of New Energy and MaterialsChina University of Petroleum(Beijing)BeijingChina Beijing Key Laboratory of Micro-Nano Energy and Sensor CAS Center for Excellence in NanoscienceBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina School of Chemical Engineering Shandong Institute of Petroleum and Chemical TechnologyDongyingShandongChina School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijingChina Institute of High Energy Physics Chinese Academy of SciencesBeijingChina

Designing high-performance and low-cost electrocatalysts for oxygen evolu-tion reaction(OER)is critical for the conversion and storage of sustainable energy *** by the biomineralization process,we utilized the phosphorylation sites of collagen molecules to combine with cobalt-based mononuclear precursors at the molecular level and built a three-dimensional(3D)porous hierarchical material through a bottom-up biomimetic self-assembly strategy to obtain single-atom catalysts confined on carbonized biomimetic self-assembled carriers(Co SACs/cBSC)after subsequent high-temperature *** this strategy,the biomolecule improved the anchoring efficiency of the metal precursor through precise functional groups;meanwhile,the binding-then-assembling strategy also effectively suppressed the nonspecific adsorption of metal ions,ultimately preventing atomic agglomeration and achieving strong electronic metal-support interactions(EMSIs).Experimental characterizations confirm that binding forms between cobalt metal and carbonized self-assembled substrate(Co–O_(4)–P).Theoretical calculations disclose that the local environment changes significantly tailored the Co d-band center,and optimized the binding energy of oxygenated intermediates and the energy barrier of oxygen *** a result,the obtained Co SACs/cBSC catalyst can achieve remarkable OER activity and 24 h durability in 1 M KOH(η_(10) at 288 mV;Tafel slope of 44 mV dec^(-1)),better than other transition metal-based catalysts and commercial IrO_(2).Overall,we presented a self-assembly strategy to prepare transition metal SACs with strong EMSIs,providing a new avenue for the preparation of efficient catalysts with fine atomic structures.

关键词： biomimetic self-assembly support electronic metal-support interactions oxygen evolution reaction single atoms catalysts

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Ultra-Thin Carbon-Doped Bi_(2)WO_(6) Nanosheets for Enhanced Photocatalytic CO_(2) Reduction

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Transactions of Tianjin University 2021年第4期27卷 338-347页

作者： Han Li Junchao Zhang Jiaguo Yu Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The photocatalytic reduction of CO_(2) is a promising strategy to generate chemical ***,this reaction usually suf-fers from low photoactivity because of insuffi cient light absorption and rapid charge *** engineering has become an eff ective approach to improve the photocatalytic ***,ultra-thin(~4.1 nm)carbon-doped Bi_(2)WO_(6) nanosheets were prepared via hydrothermal treatment followed by *** ultra-thin nanosheet structure of the cata-lyst not only provides more active sites but also shortens the diff usion distance of charge carriers,thereby suppressing charge ***,carbon doping could successfully extend the light absorption range of the catalyst and remarkably promote charge separation,thus inhibiting *** a result,the as-prepared Bi_(2)WO_(6) photocatalyst with ultra-thin nanosheet structure and carbon doping exhibits enhanced photocatalytic CO_(2) reduction performance,which is twice that of pristine ultra-thin Bi_(2)WO_(6) *** study highlights the importance of defect engineering in photocatalytic energy conversion and provides new insights for fabricating effi cient photocatalysts.

关键词： Defect engineering Bi_(2)WO_(6)nanosheet Charge separation Light absorption

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Visible light triggered exfoliation of COF micro/nanomotors for efficient photocatalysis

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Green Energy & Environment 2023年第2期8卷 567-578页

作者： Kai Feng Liang Zhang Jiang Gong Jinping Qu Ran Niu Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China The State Key Laboratory Breeding Base of Basic Science of Stomatology(Hubei-MOST)&Key Laboratory of Oral Biomedicine Ministry of Education School and Hospital of StomatologyWuhan UniversityWuhan 430079China National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510641China

We report a new facile light-induced strategy to disperse micron-sized aggregated bulk covalent organic frameworks(COFs)into isolated COFs *** was achieved by a series of metal-coordinated COFs,namely COF-909-Cu,-Co or-Fe,where for the first time the diffusio-phoretic propulsion was utilized to design COF-based micro/*** mechanism studies revealed that the metal ions decorated in the COF-909 backbone could promote the separation of electron and holes and trigger the production of sufficient ionic and reactive oxygen species under visible light *** this way,strong light-induced self-diffusiophoretic effect is achieved,resulting in good dispersion of *** them,COF-909-Fe showed the highest dispersion performance,along with a drastic decrease in particle size from 5μm to500 nm,within only 30 min light irradiation,which is inaccessible by using traditional magnetic stirring or ultrasonication *** importantly,benefiting from the outstanding dispersion efficiency,COF-909-Fe micro/nanomotors were demonstrated to be efficient in photocatalytic degradation of tetracycline,about 8 times faster than using traditional magnetic stirring *** work opens up a new avenue to prepare isolated nanosized COFs in a high-fast,simple,and green manner.

关键词： Micro/nanomotor COFs Exfoliation Nanocatalyst Photocatalysis

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Density Functional Theory for Electrocatalysis

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Energy & Environmental materials 2022年第1期5卷 157-185页

作者： Xiaobin Liao Ruihu Lu Lixue Xia Qian Liu Huan Wang Kristin Zhao Zhaoyang Wang Yan Zhao State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Zhejiang University Hangzhou 310058China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Lynbrook High School San Jose CA 95129USA The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

It is a considerably promising strategy to produce fuels and high-value chemicals through an electrochemical conversion process in the green and sustainable energy *** for electrocatalytic reactions,including hydrogen evolution reaction(HER),oxygen evolution reaction(OER),oxygen reduction reaction(ORR),nitrogen reduction reaction(NRR),carbon dioxide reduction reaction(CO_(2)RR),play a significant role in the advanced energy conversion technologies,such as water splitting devices,fuel cells,and rechargeable metal-air *** low-cost and highly efficient electrocatalysts is closely related to establishing the composition-structure-activity relationships and fundamental understanding of catalytic *** functional theory(DFT)is emerging as an important computational tool that can provide insights into the relationship between the electrochemical performances and physical/chemical properties of *** article presents a review on the progress of the DFT,and the computational simulations,within the framework of DFT,for the electrocatalytic processes,as well as the computational designs and virtual screenings of new *** useful descriptors and analysis tools for evaluating the electrocatalytic performances are highlighted,including formation energies,d-band model,scaling relation,egorbital occupation,and free energies of ***,the remaining questions and perspectives for the development of DFT for electrocatalysis are also proposed.

关键词： analysis tools density functional theory descriptors electrocatalysis

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Ceramic Stereolithography in Investment Casting: Recent Progress and Applications 75

Ceramic Stereolithography in Investment Casting: Recent Prog...

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75th World Foundry Congress, WFC 2024

作者： Hu, Kehui Wang, Haoyuan Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

Stereolithography-based ceramic additive manufacturing represents a promising technology for creating complex ceramic components with high precision. The technology's ability to form intricate structures and its compatibility with various ceramics make it particularly advantageous for rapid prototyping and low-volume production. This work discusses the recent progress and applications of stereolithography-based ceramic parts in the investment casting industry, particularly in the production of ceramic cores, shells, integrated core-shells, and filters, highlighting its potential to significantly accelerate production and enhance complexity. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Investment casting

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Shining light on transition metal tungstate-based nanomaterials for electrochemical applications:Structures,progress,and perspectives

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Nano Research 2022年第8期15卷 6924-6960页

作者： Kaijia Feng Zhefei Sun Yong Liu Feng Tao Junqing Ma Han Qian Renhong Yu Kunming Pan Guangxin Wang Shizhong Wei Qiaobao Zhang National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan Key Laboratory of Non–Ferrous Materials Science&Processing TechnologySchool of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang 471023China Provincial and Ministerial Co–construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Henan Key Laboratory of High-temperature Structural and Functional MaterialsHenan University of Science and TechnologyLuoyang 471023China Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials Xiamen UniversityXiamen 361005China

Transition metal tungstate-based nanomaterials have become one of the research hotspots in electrochemistry due to their abundant natural resources,low costs,and environmental *** studies have demonstrated their significant potentials for electrochemical applications,such as supercapacitors,Li-ion batteries,Na-ion batteries,electrochemical sensing,and *** the rapidly growing research enthusiasm for this topic over the last several years,herein,a critical review of recent progress on the application of transition metal tungstates and their composites for electrochemical applications is *** relationships between synthetic methods,nano/micro structures and electrochemical properties are systematically ***,their promising prospects for future development are also *** is anticipated that this review will inspire ongoing interest in rational designing and fabricating novel transition metal tungstate-based nanomaterials for high-performance electrochemical devices.

关键词： transition metal tungstates supercapacitors lithium-ion batteries sodium-ion batteries electrochemical sensing electrocatalysis

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Visualization and Monitoring of Shell-making Process in Investment Casting 75

Visualization and Monitoring of Shell-making Process in Inve...

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75th World Foundry Congress, WFC 2024

作者： Feng, Qian Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

Shell-making process is a critical step in investment casting for shape control, and breaking through the "black box" of this process remains a challenging issue in its research. This paper introduces blue light scanning technology into the study of investment casting shell processes, using samples with cantilever beam structures as research objects. It explores the influence of cantilever structure inclination angles on shell wall thickness and deformation. The feasibility and effectiveness of this method are demonstrated through numerical simulation results. This approach achieves visualization and digitalization of the layer-by-layer shell preparation process, providing a new technical pathway for investigating shell formation mechanisms. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Nanocantilevers

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Minimal Sintering Shrinkage Aluminum-Based Ceramic Cores Fabricated by Stereolithography 75

Minimal Sintering Shrinkage Aluminum-Based Ceramic Cores Fab...

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75th World Foundry Congress, WFC 2024

作者： Wang, Haoyuan Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

This study explores the stereolithography-based fabrication of aluminum-based ceramic cores, aimed at minimizing sintering shrinkage. Stereolithography-based ceramic cores often exhibit significant shrinkage during sintering, limiting their applications. In this work, by adding silica and kyanite into the alumina, high mechanical performance while minimizing shrinkage were achieved. Results demonstrate that cores with 22% silica and 8% kyanite show nearly zero shrinkage, making them suitable for complex, high-precision investment casting applications. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Kyanite

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Rectification Effect of 3D-Printed Filters with Deflectors 75

Rectification Effect of 3D-Printed Filters with Deflectors

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75th World Foundry Congress, WFC 2024

作者： Li, Chaoke Wang, Haoyuan Feng, Qian Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

A novel 3D-printed filter with integrated deflectors is proposed to enhance the state of metal liquid outflow. The rectification effect of filters with varying structural sizes was investigated through physical simulations. It was found that filters with smaller structural sizes allow the outflowing liquid to interact more readily under disturbance, promoting fluid convergence, but at the cost of reduced flow rates. With 3D printing, deflectors were integrated into a larger structural-size filter to guide fluid convergence, significantly enhancing the rectification effect and flow stability without reducing the flow rate. The filters proposed in this work allow for the decoupling of rectification and filtration functions, providing greater design flexibility for improving filter strength, filtration efficiency, and other critical performance attributes. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Electric rectifiers

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Hydration Characteristics and Mechanical Properties of Cement-Based materials Modified by Calcined Zeolite and Montmorillonite

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Journal of Renewable materials 2023年第5期11卷 2191-2207页

作者： Lingling Qin Mengya Zhou Jiahao Yan Ping Duan Yingcan Zhu Wei Chen Zuhua Zhang Aiguo Wang Faculty of Materials Science and Chemistry Key Laboratory of Geological Survey and Evaluation of Ministry of EducationChina University of GeosciencesWuhan430074China Key Laboratory of Advanced Building Materials of Anhui Province Anhui Jianzhu UniversityHefei230022China Guangxi Key Laboratory of New Energy and Building Energy Saving Guilin University of TechnologyGuilin541004China Key Laboratory of Road Structure and Materials of Ministry of Transport Chang’an UniversityXi’an710064China Centre for Sustainable Agricultural Systems University of Southern QueenslandToowoombaQLD4350Australia State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China Key Laboratory for Green&Advanced Civil EngineeringMaterials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha410082China

Montmorillonite and clinoptilolite zeolite were used as representative materials to prepare calcined clay-cement binary cementitious materials in order to study the effect of calcination treatment on the activation of clay minerals and the activity difference between layered and framed clays in this *** influence of different calcined clay content(2%,4%,6%,8%,10%)on the fluidity,compressive strength,microstructure,phase change,and hydration heat of cement-based materials were *** calcined clay improves the fluidity of cement-based materials as compared with the uncalcined *** addition of calcined montmorillonite(CMT)improves the development of mechanical strength,and the optimal compressive strength reaches 85 MPa at 28 days with 8%***,the activity of calcined clinoptilolite zeolite(CZL)is weak with few reaction sites,which slightly reduced the mechanical strength as compared to the blank *** addition of CMT changes the microscopic morphology of hydration products such as C-S-H and C-A-H,leading to the formation and transformation of ettringite in the early *** promotes the gradual polymerization of Si-O bonds into Si-O-Si bonds simultaneously,which accelerates the early hydration ***,CZL acts mainly as a filling function in the cementitious *** brief,CMT as an admixture can improve the mechanical properties of cement,but CZL has little *** work provides a guideline for the applications of calcined clay in cement,considering the influence of clay type on workability and mechanical strength.

关键词： Calcined clay cement montmorillonite clinoptilolite zeolite mechanical strength hydration

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