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Heterointerface Engineering-Induced Oxygen Defects for the Manganese Dissolution Inhibition in Aqueous Zinc Ion Batteries

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Energy & Environmental Materials 2024年第3期7卷 112-122页

作者： Wentao Qu Yong Cai Baohui Chen Ming Zhang Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics&Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of Education&Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China Changsha Semiconductor Technology and Application Innovation Research Institute College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China State Key Laboratory of Disaster Prevention&Reduction for Power Grid Transmission and Distribution Equipment(Hunan Electric Power Corporation Disaster Prevention and Reduction Center) Changsha 410007China

Manganese-based material is a prospective cathode material for aqueous zinc ion batteries(ZIBs)by virtue of its high theoretical capacity,high operating voltage,and low ***,the manganese dissolution during the electrochemical reaction causes its electrochemical cycling stability to be *** this work,heterointerface engineering-induced oxygen defects are introduced into heterostructure MnO_(2)(δa-MnO_(2))by in situ electrochemical activation to inhibit manganese dissolution for aqueous zinc ion ***,the heterointerface between the disordered amorphous and the crystalline MnO_(2)ofδa-MnO_(2)is decisive for the formation of oxygen *** the experimental results indicate that the manganese dissolution ofδa-MnO_(2)is considerably inhibited during the charge/discharge *** analysis indicates that the oxygen defect regulates the electronic and band structure and the Mn-O bonding state of the electrode material,thereby promoting electron transport kinetics as well as inhibiting Mn ***,the capacity ofδa-MnO_(2)does not degrade after 100 cycles at a current density of 0.5 Ag^(-1)and also 91%capacity retention after 500cycles at 1 Ag^(-1).This study provides a promising insight into the development of high-performance manganese-based cathode materials through a facile and low-cost strategy.

关键词： electrochemical activation heterointerface manganese dissolution inhibition oxygen defects zinc ion batteries

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Three-dimensional Ag/carbon nanotube-graphene foam for high performance dendrite free lithium/sodium metal anodes

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Journal of Materials science & technology 2023年第1期132卷 50-58页

作者： Bofang Tian Zhenxin Huang Xilian Xu Xiehong Cao Hui Wang Tingting Xu Dezhi Kong Zhuangfei Zhang Jie Xu Jinhao Zang Xinjian Li Ye Wang Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Center of Super-Diamond and Advanced Films(COSDAF)and Department of Chemistry City University of Hong Kong999077Hong Kong SARChina

Although lithium metal and sodium metal are promised as ideal anodes for lithium ion batteries(LIBs)and sodium ion batteries(SIBs),they still suffer from inevitable dendrite *** light of this,silver nanoparticles(Ag NPs)are sputtered onto three-dimensional carbon nanotube decorated graphene foam(3D CNT-GF)to construct superior 3D Ag/CNT-GF composite matrix for lithium metal anodes(LMAs)and sodium metal anodes(SMAs).With this design,lithiophilic/sodiophilic Ag NPs could provide favorable sites to guide Li/Na metal nucleation and growth,thus leading to low nucleation overpotentials,high Coulombic efficiency and long cycle ***,3D Ag/CNT-GF electrodes can stably cy-cle for 1000 and 750 cycles at 3 mA cm^(−2)with 1 mAh cm^(−2)for SMAs and LMAs,*** attractively,it can also stably sustain 300 cycles(SMAs)and 500 cycles(LMAs)at a large current den-sity of 5 mA cm^(−2)with 1 mAh cm^(−2).The excellent electrochemical performance can be attributed to the lithiophilic/sodiophilic electrode surface,3D porous electrode structure and the dendrite-free mor-phology as demonstrated by ex-situ scanning electron microscopy(SEM)and in-situ optical microscopy ***,full cells based on Na@3D Ag/CNT-GF||Na 3 V 2(PO 4)3@carbon(NVP@C)and Li@3D Ag/CNT-GF||LiFePO 4(LFP)could deliver highly reversible capacities of 90.1 and 106.4 mAh g^(−1),respec-tively,at 100 mA g^(−1)after 200 cycles for SIBs and LIBs,*** work demonstrates a novel 3D Ag/CNT-GF matrix for boosting Li/Na deposition stability for their future applications.

关键词： Li/Na metal anodes Lithiophilic/sodiophilic 3D Ag/CNT-GF nanostructure Dendrite-free morphology Uniform deposition In-situ optical microscopy investigation

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Growth of centimeter scale Nb_(1−x)W_(x)Se_(2) monolayer film by promoter assisted liquid phase chemical vapor deposition

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Nano Research 2022年第3期15卷 2608-2615页

作者： Boxing An Yang Ma Feihong Chu Xuhong Li Yi Wu Congya You Wenjie Deng Songyu Li Yongzhe Zhang Key Laboratory of Advanced Functional Materials Ministry of EducationCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Optoelectronics Technology of Education Ministry of China Faculty of Information TechnologyBeijing University of TechnologyBeijing 100124China School of Physics Beihang UniversityBeijing 100191China

Two-dimensional(2D)transition-metal dichalcogenide materials(TMDs)alloys have a wide range of applications in the field of optoelectronics due to their capacity to achieve wide modulation of the band gap with fully tunable ***,it is still a challenge for growing alloys with uniform components and large lateral size due to the random distribution of the crystal nucleus ***,we applied a simple but effective promoter assisted liquid phase chemical vapor deposition(CVD)method,in which the quantity ratio of promoter to metal precursor can be controlled precisely,leading to tiny amounts of transition metal oxide precursors deposition onto the substrates in a highly uniform and reproducible manner,which can effectively control the uniform distribution of element components and nucleation *** this method,a series of monolayer Nb_(1−x)W_(x)Se_(2)alloy films with fully tunable compositions and centimeter scale have been successfully synthesized on sapphire *** controllable approach opens a new way to produce large area and uniform 2D alloy film,which has the potential for the construction of optoelectronic devices with tailored spectral responses.

关键词： centimeter scale Nb_(1−x)W_(x)Se_(2) promoter assisted liquid phase chemical vapor deposition

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Non-Hermitian polarization quantized by time-reversal symmetry

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science China(physics,Mechanics & Astronomy) 2024年第12期67卷 141-147页

作者： Jing Cheng Jinbing Hu Zhigao Hu Lin Chen Minghui Lu Songlin Zhuang Technical Center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)Department of Physics and Electronic ScienceEast of China Normal UniversityShanghai200241China College of Optical-Electrical Information and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China National Laboratory of Solid State Microstructures Science and Engineering Nanjing UniversityNanjing210093China

It is well known that in one-dimensional(1D) crystalline insulators,the electric polarization is a manifestation of Berry phase,which can not be quantized by time-reversal symmetry(TRS) as in Hermitian physics TRS does not induce any topological phase in one *** this paper we report that even though associated with complex eigenenergies a 1D non-Hermitian insulator obeying only TRS is capable of presenting quantized bulk *** underlying physical reason is unveiled:TRS guarantees the complex energies to come in pair(E,E*),and the corresponding decaying and amplifying wave functions also come in pair and have the same variation rate,hence,giving rise to a stable wannier *** electron transport is performed by means of charge pumping process,which verifies the physical mechanism *** last,we discuss the possible experimental implementation of the proposed model by means of twisted-π gauge flux.

关键词： non-Hermitian polarization time-reversal symmetry complex hopping

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Enhanced gate breakdown and electroluminescence in p-GaN gate HEMTs under pulsed switching conditions 35

Enhanced gate breakdown and electroluminescence in p-GaN gat...

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35th International Symposium on Power Semiconductor Devices and ICs, ISPSD 2023

作者： Wang, Huan Yin, Yulian Ji, Fengwei Du, Jiahong Li, Haoran Zhao, Changhui Li, Baikui Hu, Cungang Cao, Wenping Tang, Xi Yang, Shu Institute of Physical Science and Information Technology School of Electrical Engineering and Automation Anhui University Hefei230601 China School of Microelectronics University of Science and Technology of China Hefei230026 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518063 China

ISBN: (纸本)9798350396829

In this work, enhanced gate breakdown under pulsed switching conditions were observed and investigated in Schottky-type p-GaN gate HEMTs. The pulsed time-dependent breakdown (TDB) and pulsed gate breakdown characteristics both featured a positive frequency dependence. At a gate bias of 10 V, the effective total lifetime extended from 170 s to 670 s with the switching frequency increased from 5 Hz to 10 kHz. By time-dependent electroluminescence (TDEL) characteristics on devices with semi-transparent gate electrodes, the high-energy ultraviolet emission increased at a higher switching frequency, indicating an enhanced hole injection into the p-GaN/AlGaN/GaN heterostructure. The enhanced hole injection annihilated more injected electrons, leading to the suppressed hot-electron effect, as well as the enhanced gate breakdown. © 2023 IEEE.

关键词： Electroluminescence

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A DFT study of two-dimensional P_2Si monolayer modified by single transition metal(Sc-Cu)atoms for efficient electrocatalytic CO_(2)reduction

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Chinese Chemical Letters 2023年第5期34卷 580-586页

作者： Chaozheng He Houyong Yang Xi Fu Xiaoli Cheng Jiyuan Guo Ling Fu Institute of Environmental and Energy Catalysis Shaanxi Key Laboratory of Optoelectronic Functional Materials and DevicesSchool of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China College of Science Hunan University of Science and EngineeringYongzhou 425199China Department of Physics Jishou UniversityJishou 416000China School of Science Jiangsu University of Science and TechnologyZhenjiang 212003China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China

In the present work,a stable two-dimensional(2D)P_(2)Si monolayer was *** monolayer is semimetallic/metallic under the PBE/HSE06 functional and is mechanically *** stability of the P_(2)Si monolayer has been proved via cohesive energy,mechanical criteria,molecular dynamics simulation,and phonon dispersion respectively,and the monolayer possesses high carrier mobility which is three times that of Mo S_(2).On the other hand,the catalytic performance of the P_(2)Si monolayer modified with a single transition metals(M=Sc-Cu)atom for the electrochemical reduction of CO_(2)was investigated,and the monolayer can catalyze CO_(2)with three constraints:stable molecular dynamics,high migration potential of metal atoms,and suitable band gap for electrocatalyst after metal doping exhibiting excellent catalytic stabilization activity and CRR *** addition,the reduction product of V@P_(2)Si is HCOOH with an overpotential as low as 0.75 V,and the most suitable reaction path is^(*)CO_(2)→^(*)CHOO→O^(*)CHOH→^(*)+HCOOH with the final reduction product HCOOH *** a whole,the above results endow the P_(2)Si monolayer to be a good 2D material holding great promises for applications in nanoelectronics and CO_(2)reduction catalysts.

关键词： First-principles calculation Global optimization method CO_(2)electrochemical reduction reaction Single-atom catalysts Phosphorus silicon compound

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Polarization dependences of the laser in 4H-SiC wafer slicing

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Optics Express 2025年第10期33卷 20682-20698页

作者： Sun, Mengping Zhao, Shusen Du, Jiabao Han, Shifei Jiang, Lu Lin, Xuechun Wang, Xubao Laboratory of All-Solid-State Light Sources Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China School of Physics and Optoelectronic Engineering Beijing University of Technology Beijing100124 China Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing Beijing100083 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing101407 China State Key Laboratory of Precision Space-Time Information Sensing Technology Beijing100084 China Key Laboratory of Photonic Control Technology Tsinghua University Ministry of Education Beijing100084 China Department of Precision Instrument Tsinghua University Beijing100084 China

This study focuses on the influence of the polarization of incident light in the laser slicing of 4H-SiC wafers. The structure of longitudinal damage within the material after laser modification was measured and analyzed. The impact of laser pulse energy on this structure was studied. Differences in longitudinal damage under different polarization states were compared. In addition, the effects of laser polarization on the modification of line width and lateral crack propagation were investigated. A vector diffraction model was established to analyze the propagation characteristics of beams with different polarization states during focusing. The results indicate that a linearly polarized beam perpendicular to the scanning direction offers superior modification efficacy compared to other directions of linear polarization and circular polarization. Azimuthally and radially polarized beams substantially decrease the length of longitudinal damage and reduce the difficulty of delamination. Compared to the linearly polarized beam perpendicular to the scanning direction, the azimuthally polarized beam reduces the longitudinal damage length by 49.3% and the delamination stress by 47.0%. In comparison, the radially polarized beam reduces the longitudinal damage length by 39.4% and the delamination stress by 53.8%. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Circular polarization

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A spin-based magnetic scanning microscope for in-situ strain tuning of soft matter

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Chinese physics B 2023年第5期32卷 102-107页

作者：丁哲孙豫蒙王孟祺余佩郑宁冲臧一鹏王鹏飞王亚聂越峰石发展杜江峰 CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing UniversityNanjing 210093China College of Engineering and Applied Science Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China School of Biomedical Engineering and Suzhou Institute for Advanced Research University of Science and Technology of ChinaSuzhou 215123China

We present a magnetic scanning microscope equipped with a nitrogen-vacancy(NV) center scanning probe that has the ability to mechanically tune the strain of soft matter in-situ. The construction of the microscope and a continuous straintuning sample holder are discussed. An optically detected magnetic resonance protocol utilized in the imaging is *** order to show the reliability of this microscope, the strain conduction is estimated with finite element simulation, and xray diffraction is required for calibration when freestanding crystal films are under consideration. A magnetic imaging result is displayed to demonstrate the nano-scale imaging capability. The microscope presented in this work is helpful in studying strain-coupled magnetic physics such as magnetic phase transition under strain and strain-tuned cycloidal orientation tilting.

关键词： nitrogen-vacancy(NV)center antiferromagnetism strain tuning soft matter

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A Segmental Measurement for Improving the Dynamic Range and Spatial Resolution of φ-OTDR Fiber Vibration Detection 2

A Segmental Measurement for Improving the Dynamic Range and ...

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2nd International Conference on advanced Optics and Photonics Research in Engineering, AOPR 2022

作者： Wang, Hengfei Xiao, Longfei Huang, Yantang School of Advanced Manufacturing Fuzhou University Jinjiang362200 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fujian Fuzhou350108 China College of Physics and Information Engineering Fuzhou University Fuzhou350108 China

Phase-sensitive optical time domain reflectometry (φ-OTDR) utilizes the back Rayleigh scattered light to realize long-distance and high spatial resolution vibration and acoustic waves detection in the whole sensing fiber. The φ-OTDR has been widely used in structure health monitoring, gas pipelines preventing digging, etc. For practical applications, because of weak backscattering Rayleigh light and exponentially decreased injecting optical signal along the optical fiber, long distance φ-OTDR detection is very difficult to realize, so how to extend detecting range meanwhile possessing a relatively high spatial resolution turns into a challenge in φ-OTDR. We proposed a scheme of adjusting EDFA output optical power to use segmented measurement to improve the performance of φ-OTDR, which can extend detecting range to several tens of kilometers. A segmental measurement scheme was proposed and the experimental results were presented. © Published under licence by IOP Publishing Ltd.

关键词： Reflection

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Research the Nonlinear Frequency Modulation of Tunable Light Source to Improve the Spatial Resolution of OFDR 2

Research the Nonlinear Frequency Modulation of Tunable Light...

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2nd International Conference on advanced Optics and Photonics Research in Engineering, AOPR 2022

作者： Xiao, Longfei Wang, Hengfei Xu, Canhua Huang, Yantang School of Advanced Manufacturing Fuzhou University Jinjiang362200 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fujian Fuzhou350108 China College of Physics and Information Engineering Fuzhou University Fuzhou350108 China

The main factor affecting the optical fiber spatial resolution of OFDR system is the non-linearity of laser frequency *** demonstrated a M-Z interferometry and performed nonlinear measurements at different frequencies. The main and auxiliary interferometers with tunable laser source(TLS) were built, and the auxiliary interferometer was used to correct the nonlinearity modulation of the frequecny of the main *** interpolation compensation scheme was *** research results of the nonlinear frequency modulation of TLS to improve the spatial resolution of optical fiber vibration sensing was demonstrated,the spatial resolution is 0.17m. © Published under licence by IOP Publishing Ltd.

关键词： Optical fibers

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