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Acoustic emission assessment of interface cracking in thermal barrier coatings

Acta Mechanica Sinica 2016年第2期32卷 342-348页

作者： Li Yang Zhi-Chun Zhong Yi-Chun Zhou Wang Zhu Zhi-Biao Zhang Can-Ying Cai Chun-Sheng Lu Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province) School of Materials Science and EngineeringXiangtan University Key Laboratory of Low Dimensional Materials & Application Technology (Ministry of Education) School of Materials Science and EngineeringXiangtan University Department of Mechanical Engineering Curtin University

In this paper,acoustic emission（AE） and digital image correlation methods were applied to monitor interface cracking in thermal barrier coatings under *** interface failure process can be identifie via its AE features,including buckling,delamination incubation and *** to the Fourier transformation of AE signals,there arefourdifferentfailuremodes：surfaceverticalcracks,opening and sliding interface cracks,and substrate *** characteristic frequency of AE signals from surface vertical cracks is 0.21 MHz,whilst that of the two types of interface cracks are 0.43 and 0.29 MHz,*** energy released of the two types of interface cracks are 0.43 and 0.29 MHz,*** on the energy released from cracking and the AE signals,a relationship is established between the interface crack length and AE parameters,which is in good agreement with experimental results.

关键词： Thermal barrier coatings Acoustic emission interface cracking Crack type Quantitative analysis

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Pressure-driven reentrant superconductivity in the heavy d-electron superconductor Rh17S15 with weak ferromagnetism in the normal state

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Physical Review B 2025年第16期111卷 L161113-L161113页

作者： Xiaofeng Xu Jiaying Nie Chunqiang Xu Ziming Zhu Xiangzhuo Xing Yalei Huang Chutong Zhang Na Zuo Chengcheng Zhao Zheyi Zhang Wei Zhou Wenhe Jiao Sheng Xu Qin Zhang Zhu-An Xu Xiaobing Liu Dong Qian Shiyan Li School of Physics Zhejiang University of Technology Hangzhou 310023 China State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai 200438 China School of Physical Science and Technology Ningbo University Ningbo 315211 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Laboratory of High Pressure Physics and Material Science (HPPMS) School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China School of Electronic and Information Engineering Changshu Institute of Technology Changshu 215500 China School of Physics Zhejiang University Hangzhou 310058 China Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China

Superconductivity beyond the conventional Bardeen-Cooper-Schrieffer framework often emerges out of a normal state that is accompanied by exotic magnetism and thereby displays many exceptional transport and thermodynamic properties. Here we report that the normal state of the heavy d-electron superconductor Rh17S15 is characterized by a weak ferromagnetism that persists up to room temperature. We show that the broad hump in its resistivity likely results from the Kondo interaction of the conduction electrons with this magnetism. By applying pressure, superconductivity is fully suppressed first. In the high-pressure regime, however, we observe a second dome of superconductivity with its maximum Tc greater than the ambient pressure value, highlighting the possible unconventional superconductivity in this heavy d-electron sulfide.

关键词： Ferromagnetism

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In-situ self-templated preparation of porous core-shell Fe_(1-x)S@N,S co-doped carbon architecture for highly efficient oxygen reduction reaction

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Journal of Energy Chemistry 2021年第3期30卷 310-317页

作者： Zhi Li Wei Wang Minjie Zhou Binhong He Wenqing Ren Liang Chen Wenyuan Xu Zhaohui Hou Yangyang Chen Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials School of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyang 414006HunanChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta 30332GAUnited States

Transition metal compound(TMC)/carbon hybrids,as prospering electrocatalyst,have attracted great attention in the field of oxygen reduction reaction(ORR).Their morphology,structure and composition often play a crucial role in determining the ORR *** this work,we for the first time report the successful fabrication of porous core-shell Fe_(1-x)S@N,S co-doped carbon(Fe_(1-x)S@NSC-t,t represents etching time)by a novel in-situ self-template induced strategy using Fe3O4 nanospheres and pyrrole as sacrificial *** post-polymerization of pyrrole can be accomplished by the Fe^(3+)released through the etching of Fe_(3)O_(4) by HCl ***,the etching time has a significant effect on the morphology,structure,composition a nd ORR performance of Fe_(1-x)S@*** on the cha racterizations,we find Fe_(1-x)S@NSC-24 can realize effective and balanced combination of Fe_(1-x)S and NSC,possessing porous core-shell architecture,optimized structure defect,specific surface area and doped heteroatoms configurations(especially for pyridinic N,graphitic N and Fe-N structure).These features thus lead to outstanding catalytic activity and cycling stability towards *** work provides a good guidance on the design of TMC/carbon-based electrodes with unique stable morphology and optimized structure and composition.

关键词： In-situ self-template Induced polymerization Porous core-shell Fe_(1-x)S@NSC Oxygen reduction reaction

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In-situ self-templating synthesis of 3D hierarchical porous carbonsfrom oxygen-bridged porous organic polymers for highperformance supercapacitors

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Nano Research 2022年第9期15卷 7759-7768页

作者： Qi Xiong Bei Liu Yijiang Liu Pu Wang Hua Cheng Huaming Li Zhouguang Lu Mei Yang College of Chemistry Xiangtan UniversityXiangtan 411105China Key Laboratory of Polymeric Materials&Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materialsof College of Hunan Provinceand Key Lab of Environment-Friendly Chemistry and Application in Ministry of EducationXiangtan UniversityXiangtan 411105China Department of Materials Science&Engineering Shenzhen Key Laboratory of Interfacial Science and Engineering of MaterialsSouthern Universityof Science and TechnologyShenzhen 518055China

It is a big challenge to well control the porous structure of carbon materials for supercapacitor ***,a simple in-situ self-templating strategy is developed to prepare three-dimensional(3D)hierarchical porous carbons with good combination of micro and meso-porous architecture derived from a new oxygen-bridged porous organic polymer(OPOP).The OPOP is produced by the condensation polymerization of cyanuric chloride and hydroquinone in NaOH ethanol solution and NaCl is in-situ formed as by-product that will serve as template to construct an interconnected 3D hierarchical porous architecture upon *** large interface pore architecture,and rich doping of N and O heteroatoms effectively promote the electrolyte accessibility and electronic conductivity,and provide abundant active sites for energy ***,the supercapacitors based on the optimized OPOP-800 sample display an energy density of 8.44 and 27.28 Wh·kg^(−1)in 6.0 M KOH and 1.0 M Na2SO4 electrolytes,*** capacitance retention is more than 94%after 10,000 ***,density functional theory(DFT)calculations have been employed to unveil the charge storage mechanism in the *** results presented in this job are inspiring in finely tuning the porous structure to optimize the supercapacitive performance of carbon materials.

关键词： in-situ self-templating porous organic polymer three-dimensional(3D)hierarchical porous carbons supercapacitors

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Semi-closed synthesis of nitrogen and oxygen Co-doped mesoporous carbon for selective aqueous oxidation

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Green Energy & Environment 2022年第1期7卷 43-52页

作者： Chen Xing Daihui Yang Yan Zhang Tian Sun Junfei Duan Hussein A.Younus Shiguo Zhang College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha410082China School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha410004China Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt

Heteroatom-doped meso/micro-porous carbon materials are conventionally produced by harsh carbonization under an inert atmosphere involving specific precursors,hard/soft templates,and heteroatom-containing ***,we report a facile synthesis of N and O co-doped meso/micro-porous carbon(NOMC)by template-free carbonization of a small-molecule precursor in a semi-closed *** semi-closed carbonizaiton process yields hydrophilic NOMCs with large surface area in a high *** porous structure as well as the elemental composition of NOMCs can be modulated by changing the holding time at a particular *** as metal-free heterogeneous catalysts can selectively oxidize benzyl alcohol and its derivatives into aldehydes/ketones with>85%conversion in aqueous solution,which is much higher than that of the control sample obtained in tube furnace(21%conversion),mainly due to their high N content,high percentage of pyridinic N,and large surface *** presence of O-containing moieties also helps to improve the hydrophilicity and dispersion ability of catalysts and thus facilitates the mass transfer process during aqueous *** NOMC catalysts also dispayed excellent activity for a wide range of substrates with a selectivity of>99%.

关键词： Semi-closed carbonization Nitrogen and oxygen doping Mesoporous carbon Metal-free catalyst Selective aqueous oxidation

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Developing new Mg alloy as potential bone repair material via constructing weak anode nano-lamellar structure

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Journal of Magnesium and Alloys 2023年第1期11卷 154-175页

作者： Jinshu Xie Lele Wang Jinghuai Zhang Liwei Lu Zhi Zhang Yuying He Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan411201China

The mechanics-corrosion and strength-ductility tradeoffs of magnesium(Mg)alloys have limited their applications in fields such as orthopedic ***,a fine-grain structure consisting of weak anodic nano-lamellar solute-enriched stacking faults(SESFs)with the average thickness of 8 nm and spacing of 16 nm is constructed in an as-extruded Mg96.9Y1.2Ho1.2Zn0.6Zr0.1(at.%)alloy,obtaining a high yield strength(YS)of 370 MPa,an excellent elongation(EL)of 17%,and a low corrosion rate of 0.30 mm y−1(close to that of high-pure Mg)in a uniform corrosion *** scanning Kelvin probe force microscopy(SKPFM),one-dimensional nanostructured SESFs are identified as the weak anode(∼24 mV)for the first *** excellent corrosion resistance is mainly related to the weak anodic nature of SESFs and their nano-lamellar structure,leading to the more uniform potential distribution to weaken galvanic corrosion and the release of abundant Y^(3+)/Ho^(3+)from SESFs to form a more protective film with an outer Ca_(10)(PO_(4))_(6)(OH)_(2)/Y_(2)O_(3)/Ho_(2)O_(3) layer(thickness percentage of this layer:72.45%).For comparison,the as-cast alloy containing block 18R long period stacking ordered(LPSO)phase and the heat-treated alloy with fine lamellar 18R-LPSO phase(thickness:80 nm,spacing:120 nm)are also studied,and the characteristics of SESFs and 18R-LPSO phase,such as the weak anode nature of the former and the cathode nature of the latter(37-90 mV),are distinguished under the same alloy ***,we put forward the idea of designing Mg alloys with high mechanical and anti-corrosion properties by constructing"homogeneous potential strengthening microstructure",such as the weak anode nano-lamellar SESFs structure.

关键词： Mg alloys Corrosion Solute-enriched stacking faults LPSO structure SKPFM Hydroxyapatite

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Li-ion charge storage performance of wood-derived carbon fibers@MnO as a battery anode

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Chinese Chemical Letters 2022年第2期33卷 1091-1094页

作者： Qinyuan Huang Jinbo Hu Mei Zhang Mengxiao Li Ting Li Guangming Yuan Yuan Liu Xiang Zhang Xiaowei Cheng College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha 410004China Hunan Province Key Laboratory of Materials Surface&Interface Science and Technology Central South University of Forestry and TechnologyChangsha 410004China Hunan Taohuajiang Bamboo Science&Technology Co. Ltd.Taojiang 413400China Department Chemistry Fudan UniversityShanghai 200433China

Wood-derived carbons have been demonstrated to have large specific capacities as the anode materials of lithium-ion batteries(LIBs). However, these carbons generally show low tap density and minor volumetric capacity because of high specific surface area and pore volume. Combination with metal oxide is one of the expected methods to alleviate the obstacles of wood-derived carbons. In this work, the composites of Mn O loaded wood-derived carbon fibers(CF@Mn O) were prepared via a simple and environmentally friendly method, showing decreased specific surface area due to the generation of Mn O nanoparticles on carbon fibers. Furthermore, the CF@Mn O compostites exhibit superior electrochemical performance as anode materials of LIBs, which show high reversible capacity in the range of 529-734 m Ah/g at a current density of 100 m A/g. The optimal CF@Mn O product(Mn O:carbon = 1:2) delivers reversible capacity of 734 and 265.3 m Ah/g at current density of 100 and 2000 m A/g, respectively. Besides, the material presents outstanding stability with coulombic efficiency around 100% after 200 cycles at a high current density of 400 m A/g, revealing a potential as promising anode materials for high-performance LIBs.

关键词： Wood-derived carbons Environmentally friendly MnO nanoparticles Anode materials Lithium-ion batteries

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Gate regulated near-infrared photodetector utilizing interlayer excitons for MoS2/CrPS4 heterojunction

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science China(Information sciences) 2024年第3期67卷 315-316页

作者： Guoliang XU Chao HE Donghong SHI Danmin LIU Wenjie DENG Jingzhen LI Xingtao AN Yongzhe ZHANG Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface College of ScienceHebei University of Science and Technology Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of Technology Key Laboratory of Optoelectronics Technology Ministry of EducationFaculty of Information TechnologyBeijing University of Technology

Excitons play an important role as interconnect in the optical and optoelectronic response and have attracted much attention for understanding the physical matters behind excitons [1, 2]. Excitons in atomically thin transition metal dichalcogenides semiconductors(TMDs) often trap an electron(X-) or a hole(X+) to form so-called trions,

关键词： Excitons

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Interfacial Ohmic contact engineering in MoSe2/Ti3C2 Heterostructures for high-performance sodium-ion capacitors

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Journal of Electroanalytical Chemistry 2025年 990卷

作者： Xiao, Yuanhua Yuan, Gaozhan Su, Dangcheng Fan, Yuanyuan Wang, Haoshuang Ge, Xutao Zhou, Jun Fang, Shaoming Wang, Xuezhao Key Laboratory of Surface & Interface Science and Technology Zhengzhou University of Light Industry Zhengzhou455002 China Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery School of Material Science and Engineering Luoyang Institute of Science and Technology Luoyang471023 China College of Food and Chemical Zhengzhou University of Technology Zhengzhou450044 China

The development of sodium-ion capacitors (SICs) is hindered by the kinetic mismatch between sluggish ion diffusion in battery-type anodes and rapid surface reactions in capacitive cathodes. Herein, a MoSe2/Ti3C2 heterostructure with ohmic contact interfaces is synthesized via a facile solvothermal method, which simultaneously improve charge transfer kinetics and structural stability. Density functional theory (DFT) calculations reveal that the MoSe2/Ti3C2 interface reduces Na+ diffusion energy barriers while providing efficient electron transport pathways. Notably, the MoSe2/Ti3C2 heterostructure as a sodium-ion battery (SIB) anode delivers a high reversible capacity of 506.2 mAh g−1 at 0.1 A g−1 and retains a capacity of 314.2 mAh g−1 at 10.0 A g−1, demonstrating exceptional rate capability. When coupled with a commercial activated carbon (AC) cathode, the SIC device achieves energy densities of 101.3 Wh kg−1 at 297.8 W kg−1, retaining 26.1 Wh kg−1 even at 11.2 kW kg−1. Additionally, the device exhibits outstanding cycling stability with 97.5 % capacity retention after 5500 cycles. These results highlight the critical role of ohmic contact engineering in optimizing hybrid electrode design and provide a pathway for advancing high-performance SICs. © 2025 Elsevier B.V.

关键词： Sodium-ion batteries

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Built-in piezoelectric field improved photocatalytic performance of nanoflower-like Bi_(2)WO_(6) using low-power white LEDs

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Chinese Chemical Letters 2021年第7期32卷 2317-2321页

作者： Hua Lei Meixuan Wu Ying Liu Fan Mo Jiayao Chen Shilong Ji Yan Zou Xiaoping Dong Department of Chemistry Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityXiasha Higher Education ZoneHangzhou 310018China

Photocatalysis technology has been proved to be a potential strategy for removal of organic dyes,however high-power light sources are generally necessary to initiate photocatalytic *** this work,we employed an excellent photocatalyst of Bi_(2)WO_(6) with visible light harvest and meanwhile an intrinsic ferroelectricity,which realized the efficient degradation of organic dye via the synergetic *** coupling the illumination by a low-power(9 W)LED and the ultrasonic vibration(120 W)by an ultrasonic cleaner,the nano flower-like Bi_(2)WO_(6) composed of ultrathin nanosheets showed a much more enhanced photopiezocatalysis performance for purification of organic dye than the individual photocatalysis and ***,the high mineralization efficiency and the good durability of the Bi_(2)WO_(6) catalyst were *** possible mechanism of photopiezocatalysis was finally proposed,where the ultrasound-induced piezoelectric field in Bi_(2)WO_(6) drove photo-generated electrons and holes to diffuse along opposite directions,consequently promoting the separation efficiency of charge *** work indicates that the synergetic photopiezocatalysis by coupling irradiation and ultrasonic vibration is a promising strategy to purify organic pollutants in wastewater.

关键词： Photopiezocatalysis LED illumination Ultrasonic vibration Piezoelectric effect Dye degradation

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