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Interface engineering of Cu 2-x Se/Bi 2 Se 3 heterostructure in situ encapsulated into porous carbon for superior lithium/sodium ion storage

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Journal of Power Sources 2025年 652卷

作者： Xue Guo Jiahui Cao Yang Liu Kun Zhao Hui Peng Jianbo Xiong Bitao Su Xiaobo Zhang Ming Zhong State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou 730050 PR China Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education Key Laboratory of Eco-Environmental Polymer Materials of Gansu Province College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 PR China State Key Laboratory of Nuclear Resources and Environment School of Chemistry and Materials Science East China University of Technology Nanchang 330013 PR China

The integration of heterostructure engineering with carbon materials exhibits significant advantages in enhancing ion transport efficiency and stability, buffering volume changes, and improving electrochemical lithium/sodium storage performance of transition metal selenide electrodes. In this study, we employ binary metal-organic frameworks as the precursors to successfully prepare rod-shaped composites assembled by carbon-coated bimetallic heterostructure nanoparticles (Cu 2-x Se/Bi 2 Se 3 @C) through a controlled selenization process at varying temperatures. The optimized Cu 2-x Se/Bi 2 Se 3 @C-600 composite demonstrate exceptional lithium storage capabilities, achieving high reversible capacities of 1102.3 mAh g −1 at 0.2 A g −1 after 100 cycles and 640.6 mAh g −1 at 1.0 A g −1 after 500 cycles. Ex-situ XRD analysis and theoretical calculations are utilized to elucidate the electrochemical reaction mechanisms and the benefits of the heterointerface in enhancing performance. The density functional theory calculation results indicate that the heterointerface in Cu 2-x Se/Bi 2 Se 3 reduces diffusion energy barrier of surface Li + ions and enhances electronic conductivity. The unique structure and composition advantages also grant the optimal composite superior sodium storage performance with high specific capacity (442.7 mAh g −1 at 0.2 A g −1 after 100 cycles), exceptional rate capability (297.3 mAh g −1 at 10.0 A g −1 ), and long-term cyclability (254.7 mAh g −1 at 5.0 A g −1 after 500 cycles).

关键词： Binary metal-organic framework Heterostructure engineering Lithium/sodium storage performance Mechanism analysis

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CoFe2O4 Embedded Bacterial Cellulose for Flexible, Biodegradable, and Self-Powered Electromagnetic Sensor

SSRN

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SSRN 2022年

作者： Chen, Kun Li, Yifan Du, Zhuolin Hu, Sanming Huang, Jianyu Shi, Zhijun Su, Bin Yang, Guang Department of Biomedical Engineering College of Life Science and Technology Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Sinosteel Nanjing Advanced Materials Research Institute Co. Ltd. Nanjing211100 China School of Biomedical Engineering and Imaging Xianning Medical College Hubei University of Science and Technology Xianning437100 China

Self-powered flexible electromagnetic sensors based on flexible magnets are promising to be applied in wearable field. As the core component of motion sensors, flexible magnets are getting growing attentions. However, most reported flexible magnets were fabricated with non-degradable substrate materials via complicated processes. Here, a novel flexible, biodegradable and self-powered electromagnetic sensor was prepared based on CoFe2O4 -embedded magnetic bacterial cellulose, which is prepared by a facile and economical in-situ co-precipitation paired with a post-process of hot-pressing and magnetizing. Magnetic CoFe 2 O 4 nanoparticles were synthesized in network structure of degradable bacterial cellulose for flexible composited magnetic films. Degradation experiment demonstrated that the flexible magnetic films degraded completely within 56 hours, and the left magnetic materials of CoFe 2 O 4 nanoparticles could be recycled. The flexible electromagnetic sensors based on composited films were tested in a customized testing platform, manifesting excellent sensing properties and stability. To deeply verify the application potential of the flexible electromagnetic sensors, an intelligent jacket, which was sewn with flexible magnetic film and copper coils was designed. It is capable of monitoring motion signals and distinguishing the motion state, proving that the biodegradable flexible electromagnetic sensor is promising to be utilized in wearable field as a kind of eco-friendly flexible sensor. © 2022, The Authors. All rights reserved.

关键词： Cellulose

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Ti-Al Coating Fabricated on Titanium Alloy by Simple Heat Treatment and its Properties in the Proton Exchange Membrane Fuel Cell Environment

SSRN

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SSRN 2022年

作者： Tang, Shawei Zhou, Ying Sun, Xinghui Sun, Yi Pan, Yu Deng, Chengwei Hu, Jin San, Hongshan Han, Jiaping School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China State Key Laboratory of Space Power Technology Shanghai Institute of Space Power Sources Shanghai200245 China School of Materials Science and Engneering Henan Polytechnic University Henan Jiaozuo454000 China Institute of Vanadium & Titanium Panzhihua University Panzhihua617000 China

Coatings containing Ti-Al compound with both metallic and ceramic properties are prepared on the surface of TC4 by simple heat treatment. It is a potential modification method for titanium bipolar plate, which is one of the core component in proton exchange membrane fuel cell (PEMFC). The effects of heat treatment on the formation mechanism and properties of the coatings are investigated. The results indicate that the heating temperature strongly affects the microstructure, corrosion resistance, interface contact resistance (ICR) and water contact angle of the coatings. The Ti3Al phase and TiAl phase co-exist on the surface of the heat-treated samples at 900oC and above. The corrosion resistance of the coating is evaluated in a simulated PEMFC environment and an accelerated corrosion environment. The coated sample prepared at 950oC presents the lowest corrosion current density, and the coated sample prepared at 900oC (PC-900) followed it. The ICR value of PC-900 (2.7 mΩ cm2) is even lower than that of graphite plate. The water contact angles of all coated samples are higher than that of TC4 alloy and it reaches 111.22° for PC-900, exhibiting a good hydrophobicity. All the above results, indicate the PC-900 satisfies the standard from the US department of energy. © 2022, The Authors. All rights reserved.

关键词： Corrosion resistance

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Surface functionalization on nanoparticles via atomic layer deposition

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Science Bulletin 2020年第8期65卷 678-688,M0004页

作者： Kun Cao Jiaming Cai Bin Shan Rong Chen State Key Laboratory of Digital of Manufacturing Equipment and Technology.School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As an ultrathin film preparation method,atomic layer deposition(ALD)has recently found versatile applications in fields beyond semiconductors,such as energy,environment,catalysis and so *** design,preparation and characterization of thin film applied in the emerging fields have attracted great *** development of ALD technique on particles opens up a broad horizon in the advanced *** applications are exploring conformal coating,porous coating and selective surface modification of *** encapsulation of particles is a major application to protect materials with ultrathin films from being eroded by the external environment while keeping the original properties of the primary *** coating has been developed to simultaneously expose the particles’surface and provide nanopores,which is another important method that demonstrates its advantages in modification of electrode materials,catalysis and energy applications,*** ALD takes the method forward in order to precisely control the directionality of decoration sites on the particles and selectively passivate undesired facets,sites,or *** methods provide practical strategies for atomic scale and precise surface functionalization on particles and greatly expand its potential applications.

关键词： Atomic layer deposition Surface functionalization Conformal encapsulation Porous coating Selective decoration

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Restriction of Intramolecular Motion(RIM):Investigating AIE Mechanism from Experimental and Theoretical Studies

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Chemical Research in Chinese Universities 2021年第1期37卷 1-15页

作者： ZHANG Jianyu ZHANG Haoke LAM Jacky W.Y. TANG Ben Zhong Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science&TechnologyClear Water BayKowloonHong KongP.R.China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027P.R.China Center for Aggregation-Induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640P.R.China Guangzhou Development District AIE InstituteGuangzhou510530P.R.China

Mechanistic studies promote scientific development from phenomena to ***-induced emission(AIE),as an unusual photophysical phenomenon,builds the bridge between molecular science and aggregate *** the twenty-year development of AIE,restriction of intramolecular motion(RIM)has been verified as the working mechanism of AIE *** this review,these mechanistic works about RIM are summarized from experimental and theoretical ***,the experimental studies are introduced from three parts:external rigidification,structural modification and structural *** the theoretical part,calculations on the low-frequency motion of AIEgens have been performed to prove the RIM *** virtue of the theoretical calculations,some new mechanisms are proposed to supplement the RIM,such as restriction of access to conical intersection,suppression of Kasha transition,restriction of access to dark state,*** is foreseeable that the RIM mechanism will unify the photophysical theories for both molecules and aggregates,and inspire more progress in aggregate science.

关键词： Aggregation-induced emission(AIE) Restriction of intramolecular motion Photophysical mechanism Aggregate science

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Ti-Al Coating Fabricated on Titanium Alloy by Simple Heat Treatment and its Properties in the Proton Exchange Membrane Fuel Cell Environment

SSRN

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SSRN 2022年

Coatings containing Ti-Al compound with both metallic and ceramic properties are prepared on the surface of TC4 by simple heat treatment. It is a potential modification method for titanium bipolar plate. The effects of heat treatment on the formation mechanism and properties of the coatings are investigated. The corrosion resistance of the coating is evaluated in a simulated PEMFC environment and an accelerated corrosion environment. The coated sample prepared at 950oC presents the lowest corrosion current density, and the coated sample prepared at 900oC (PC-900) followed it. The ICR value of PC-900 (2.7 mΩ cm2) is even lower than that of graphite plate. The water contact angles of all coated samples are higher than that of TC4 alloy and it reaches 111.22° for PC-900, exhibiting a good hydrophobicity. All the above results, indicate the PC-900 satisfies the standard from the US department of energy. © 2022, The Authors. All rights reserved.

关键词： Corrosion resistance

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Low Viscosity Epoxy Structural Adhesive Cured at Room Temperature for Crack Repair of Subway Tunnel

Low Viscosity Epoxy Structural Adhesive Cured at Room Temper...

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作者： Ming Xiao Xiaojiang Sun Huaqing Rong Shuguang Bi Jiagong Tang Xianmeng Luo Jianhua Ran Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing State Key Laboratory of New Textile Materials and Advanced Processing TechnologiesCollege of Chemistry and Chemical EngineeringWuhan Textile University Hubei DaTangAnSheng Construction Engineering Co.Ltd

Epoxy structural adhesive has good mechanical properties,especially high adhesion,low shrinkage rate,and high stability,widely used in steel plate reinforcement,crack repair,bridge splicing,and concrete bonding,***,due to the high cross-linking density and high internal stress after curing,its shortcomings,such as brittleness,the poor performance of fatigue resistance and heat resistance,limit its application in special track *** this work,two kinds of epoxy structural adhesives(EPA-1,EPA-2) with low viscosity and room temperature curing were synthesized by selecting different bisphenol A epoxy resin and active diluent as component A and modified amine curing agent as component *** results showed that EPA-1 and EPA-2 presented significant toughness compared with the classic construction adhesive(AralditeXH160).The yield strengths of EPA-1 and EPA-2 were 4.88 MPa and 13.13 MPa,and the shear strengths were 11.93 MPa and 13.08 MPa,respectively,showing good adhesive *** addition,the viscosities of EPA-1 and EPA-2 were 127 mPa·s and 308 m Pa·s,respectively,and their decomposition temperatures were all above ～280 ℃,which indicated that the self-made epoxy structural adhesives could be used for the repair of cracks in the vibration subway tunnel.

关键词： Epoxy structural adhesive low viscosity room temperature curing crack repair subway tunnel

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Optical microscopy-based thickness estimation in thin GaSe flakes

arXiv

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arXiv 2021年

作者： Zhang, Wenliang Zhao, Qinghua Puebla, Sergio Wang, Tao Frisenda, Riccardo Castellanos-Gomez, Andres MadridE-28049 Spain State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an710072 China Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Xi'an710072 China

We have implemented three different optical methods to quantitatively assess the thickness of thin GaSe flakes transferred on both transparent substrates, like Gel-Film, or SiO2/Si substrates. We show how their apparent color can be an efficient way to make a quick rough estimation of the thickness of the flakes. This method is more effective for SiO2/Si substrates as the thickness dependent color change is more pronounced on these substrates than on transparent substrates. On the other hand, for transparent substrates, the transmittance of the flakes in the blue region of the visible spectrum can be used to estimate the thickness. We find that the transmittance of flakes in the blue part of the spectrum decreases at a rate of 1.2%/nm. On SiO2/Si, the thickness of the flakes can be accurately determined by fitting optical contrast spectra to a Fresnel law-based model. Finally, we also show how the quantitative analysis of transmission mode optical microscopy images can be a powerful method to quickly probe the environmental degradation of GaSe flakes exposed to aging conditions. © 2021, CC BY-NC-ND.

关键词： Selenium compounds

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Unraveling the Synergy of Interface Engineering Α-Mno2/Bi2wo6 Heterostructure and Defective Active Sites for Superdurable Photocatalysis: Mechanism Insights of Charge Separation/Transfer

SSRN

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SSRN 2023年

作者： Arif, Muhammad Mahsud, Ayaz Ali, Amjad Liao, Shipeng Chen, Yinjuan Xia, Jiawei Xiao, Hai Azam, Mohammad Chen, Haiqun Muhmood, Tahir Lu, Zhansheng Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University Changzhou213164 China School of Physics Henan Normal University Xinxiang453007 China Linköping University Department of Science and Technology Laboratory of Organic Electronics NorrköpingSE‐60174 Sweden Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing100084 China Department of Chemistry College of Science King Saud University PO Box 2455 Riyadh11451 Saudi Arabia Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Science Nanjing Forestry University Nanjing210037 China

The construction of visible-light-driven hybrid heterostructure photocatalysts is of great significance for environmental remediation, though the utilization of strong visible-light response photocatalysts with high efficiency and stability remains a major challenge. Defect engineering is an excellent way to introduce metal cation vacancies in materials, thereby ensuing in highly enhanced catalytic performance. Inspired by this, we effectively constructed a built-in interface α-MnO2/Bi2WO6 heterostructure with abundant intimate interfaces and defective Mn3+/Mn4+ active sites for photocatalytic tetracycline hydrochloride (TC-HCl), hexavalent chromium Cr(VI) reduction, and Escherichia coli (E. coli) inactivation. The experimental results, such as the active species test and the X-ray photoelectron spectroscopy, indicated that the defective sites Mn3+/Mn4+, surface oxygen vacancies, and the Bi(3+x)+ boosted the visible light absorption, and highly enhanced the photoinduced charge separation/transfer. Furthermore, experimental and DFT calculations reveal the high charge density at the built-in interface heterostructure and the Z-scheme charge transfer mechanism during the photocatalytic process. The results further reveal that the •O2- and 1O2 are the main reactive active species contributing to the photocatalytic reaction. The exceptional TC-HCl decomposition activity of α-MnO2/Bi2WO6 heterostructure (97.56%, 2.31, and 2.04 higher than bulk), the enhanced reaction kinetics (Kapp= 0.041 min-1, 6.4, and 5.2 times higher than bulk), removal rate 80.3%, Cr6+ reduction to Cr3+ (98.56%, Kapp= 0.0599 min-1), and almost 100% bacterial inactivation compared to bulk α-MnO2 (42.22%) and Bi2WO6 (47.76%), mainly due to the enhanced charge separation/transfer at the built-in interface and high charge density. The study opens new horizons for constructing Z-Scheme MnO-based interface heterostructures with abundant defective sites for exceptional photocatalytic applications. © 2023, T

关键词： Bismuth compounds

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Symmetry-Broken Ru Nanoparticles with Parasitic Ru-Co Dual-Single Atoms Overcome the Volmer Step of Alkaline Hydrogen Oxidation

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Angewandte Chemie 2024年第12期136卷

作者： Xueqin Q. Mu Prof. Suli L. Liu Mengyang Y. Zhang Zechao C. Zhuang Ding Chen Yuru R. Liao Hongyu Y. Zhao Prof. Shichun C. Mu Dingsheng S. Wang Prof. Zhihui H. Dai School of Chemistry and Molecular Engineering Nanjing Tech University Nanjing 211816 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Engineering Research Center of Advanced Rare Earth Materials Department of Chemistry Tsinghua University Beijing 100084 P. R. China

Efficient dual-single-atom catalysts are crucial for enhancing atomic efficiency and promoting the commercialization of fuel cells, but addressing the sluggish kinetics of hydrogen oxidation reaction (HOR) in alkaline media and the facile dual-single-atom site generation remains formidable challenges. Here, we break the local symmetry of ultra-small ruthenium (Ru) nanoparticles by embedding cobalt (Co) single atoms, which results in the release of Ru single atoms from Ru nanoparticles on reduced graphene oxide (Co 1 Ru 1,n /rGO). In situ operando spectroscopy and theoretical calculations reveal that the oxygen-affine Co atom disrupts the symmetry of ultra-small Ru nanoparticles, resulting in parasitic Ru and Co dual-single-atom within Ru nanoparticles. The interaction between Ru single atoms and nanoparticles forms effective active centers. The parasitism of Co atoms modulates the adsorption of OH intermediates on Ru active sites, accelerating HOR kinetics through faster formation of *H 2 O. As anticipated, Co 1 Ru 1,n /rGO exhibits ultrahigh mass activity (7.68 A mg Ru −1 ) at 50 mV and exchange current density (0.68 mA cm −2 ), which are 6 and 7 times higher than those of Ru/rGO, respectively. Notably, it also displays exceptional durability surpassing that of commercial Pt catalysts. This investigation provides valuable insights into hybrid multi-single-atom and metal nanoparticle catalysis.

关键词： dual-single-atom catalysts hydrogen oxidation reaction symmetry-breaking parasitic Ru nanoparticles

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