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Nonstoichiometric In-S group yielding efficient carrier transfer pathway in In_(2)S_(3) photoanode for solar water oxidation

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SusMat 2024年第1期4卷 154-165页

作者： Runyu Chen Linxing Meng changda wang Weiwei Xu Yulong Huang Li Song Liang Li School of Physical Science and Technology Jiangsu Key Laboratory of Thin FilmsCenter for Energy Conversion Materials&PhysicsSoochow UniversitySuzhouJiangsuP.R.China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhouJiangsuP.R.China National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefeiAnhuiP.R.China School of Electronic and Information Engineering Changshu Institute of TechnologyChangshuJiangsuP.R.China

The construction of high-efficiency photoanodes is essential for developing outstanding photoelectrochemical(PEC)water splitting ***,insufficient carrier transport capabilities and sluggish surface water oxidation kinetics limit its *** a solvothermal annealing strategy,we prepared a nonstoichiometric In-S(NS)group on the surface of an In_(2)S_(3) photoanode in situ and unexpectedly formed a type II transfer path of carrier,thereby reducing the interfacial recombination and promoting the bulk *** calculations and comprehensive characterizations demonstrated NS group as an excellent oxygen evolution cocatalyst(OEC)that effectively facilitated carrier transport,lowered the surface overpotential,increased the surface active site,and accelerated the surface oxygen evolution reaction kinetics by precisely altering the rate-determining steps of*to*OH and*O to**** synergistic effects remarkably enhanced the PEC performance,with a high photocurrent density of 5.02 mA cm^(−2)at 1.23 V versus reversible hydrogen electrode and a negative shift in the onset potential by 310 *** work provides a new strategy for the in situ preparation of high-efficiency OECs and provides ideas for constructing excellent carrier transfer and transport channels.

关键词： In_(2)S_(3) photoanode water splitting

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外磁场调控下偶极梯度半空间中弹性波的反射

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力学季刊 2024年第1期45卷 200-209页

作者：边鑫禹李月秋王长达齐齐哈尔大学理学院黑龙江齐齐哈尔161006 防灾科技学院中国地震局建筑物破坏机理与防御重点实验室北京101601

本文研究了在偶极梯度弹性固体中,在外加磁场调控作用下,弹性波在界面上的反射问题.当入射波的波长与材料的微结构特征长度近似或者弹性波的频率较高时,材料的微结构效应显著增加.本文首先应用偶极应变梯度理论和麦克斯韦电磁理论推导... 详细信息

本文研究了在偶极梯度弹性固体中,在外加磁场调控作用下,弹性波在界面上的反射问题.当入射波的波长与材料的微结构特征长度近似或者弹性波的频率较高时,材料的微结构效应显著增加.本文首先应用偶极应变梯度理论和麦克斯韦电磁理论推导出弹性波传播的色散方程,然后根据界面条件分别计算出P波入射和SV波入射时各种反射波与入射波的振幅比.最后,根据数值计算结果,讨论了外加磁场以及入射波长对反射波传播的影响.研究结果发现,在偶极梯度弹性固体中,微结构效应可以导致新的波动模式产生和弹性波的色散特征的出现,而外加磁场只是通过洛伦兹力的作用对弹性波传播的速度产生影响,但不会产生新的波动模式和影响弹性波的色散性质.

关键词：偶极应变梯度微结构效应洛伦兹力反射

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Multilevel security model for ad hoc networks

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Journal of Systems Engineering and Electronics 2008年第2期19卷 391-397,F0003页

作者： wang changda Ju Shiguang School of Computer Science and Telecommunications Engineering Jiangsu Univ. Jiangsu 212013 P. R. China School of Computer Science Carleton Univ. Ottawa Ontario K1S 5B6 Canada

Modern battlefield doctrine is based on mobility, flexibility, and rapid response to changing situations. As is well known, mobile ad hoc network systems are among the best utilities for battlefield activity. Although much research has been done on secure routing, security issues have largely been ignored in applying mobile ad hoc network theory to computer technology. An ad hoc network is usually assumed to be homogeneous, which is an irrational assumption for armies. It is clear that soldiers, commanders, and commanders-in-chief should have different security levels and computation powers as they have access to asymmetric resources. Imitating basic military rank levels in battlefield situations, how multilevel security can be introduced into ad hoc networks is indicated, thereby controlling restricted classified information flows among nodes that have different security levels.

关键词： ad hoc network multilevel security model access control.

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Base communication model of IP covert timing channels

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Frontiers of Computer Science 2016年第6期10卷 1130-1141页

作者： changda wang Yulin YUAN Lei HUANG School of Computer Science and Communication Engineering Jiangsu University Zhenjiang 212013 China

IP covert timing channel （IPCTC） is an unconventional communication channel which attaches time information to the packets of an overt channel as messages carders, e.g., using different inter-packet delays to transmit messages in a packet-switched network. Although the IPCTCs have many different communication methods, based on the concept of time, we categorized the base communication model of the IPCTCs into three types and then utilized the signal processing theory to build their mathematical models. As a result, the basic characteristics of the IPCTCs＇ base model were formally derived. Hence, the characteristics of any IPCTC can be derived from the base models that consist of the IPCTC. Furthermore, a set of approaches was devised to implement the base model of the IPCTCs in a TCP/IP network. Experimental results show the correctness of the pro- posed base model of the IPCTCs in this paper.

关键词： network timing channel base communication model bandwidth error rate stealthiness

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Reflection and transmission of elastic waves through a couple-stress elastic slab sandwiched between two half-spaces

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Acta Mechanica Sinica 2017年第6期33卷 1022-1039页

作者： changda wang Xuejun Chen Peijun Wei Yueqiu Li Department of Applied Mechanics University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science University of Science and Technology Beijing Beijing 100083 China Department of Mathematics Qiqihar University Qiqihar 161006 China

The reflection and transmission of elastic waves through a couple-stress elastic slab that is sandwiched between two couple-stress elastic half-spaces are studied in this paper. Because of the couple-stress effects, there are three types of elastic waves in the couple-stress elastic solid, two of which are dispersive. The interface conditions between two couple-stress solids involve the surface couple and rotation apart from the surface traction and displacement. The nontraditional interface conditions between the slab and two solid half-spaces are used to obtain the linear algebraic equation sets from which the amplitude ratios of reflection and transmission waves to the incident wave can be determined. Then,the energy fluxes carried by the various reflection and transmission waves are calculated numerically and the normal energy flux conservation is used to validate the numerical results. The special case, couple-stress elastic slab sandwiched by the classical elastic half-spaces, is also studied and compared with the situation that the classical elastic slab sandwiched by the classical elastic half-spaces. Incident longitudinal wave(P wave) and incident transverse wave(SV wave) are both considered. The influences of the couplestress are mainly discussed based on the numerical *** is found that the couple-stress mainly influences the transverse modes of elastic waves.

关键词： Reflection/transmission Sandwiched slab Couple-stress Energy flux Multiple reflection/transmission

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Relection of elastic waves at the elastically supported boundary of a couple stress elastic half-space

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Acta Mechanica Solida Sinica 2017年第2期30卷 154-164页

作者： changda wang Xuejun Chen Peijun Wei Yueqiu Li Department of Applied Mechanics Uniuersity of Science and Technology Beijing Beijing 100083 China Belting Key Laboratory for Magneto-Photoelectrical Composite and Interface Science University of Science and Technology Beijing Beijing 100083 China Department of Mathematics Qiqihar Uniuersity Qiqihar 161006 China

The relection elastic waves at the elastically supported boundary of a couple stress elastic half-space are studied in this paper. Different from the classical elastic solid, there are three kinds of elastic waves in the couple stress elastic solid, and two of them are dispersive. The boundary conditions of a couple stress elastic half-space include the couple stress vector and the rotation vector which disappear in the classical elastic solids. These boundary conditions are used to obtain a linear algebraic equation set, from which the amplitude ratios of relection waves to the incident wave can be determined. Then, the relection coeficients in terms of energy lux ratios are calculated numerically, and the normal energy lux conservation is used to validate the numerical results. Based on these numerical results,the inluences of the boundary parameters, which relect the mechanical behavior of elastic support, on the relection energy partition are discussed. Both the incident longitudinal wave（the P wave） and incident transverse wave（the SV wave） are considered.

关键词： Relection Elastic support Couple stress Dispersive waves Energy lux

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Cation-intercalated engineering and X-ray absorption spectroscopic characterizations of two dimensional MXenes

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Chinese Chemical Letters 2020年第4期31卷 969-979页

作者： changda wang Shiqiang Wei Pengjun Zhang Kefu Zhu Pin Song Shuangming Chen Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China

The geometrically multiplied development of 2D MXenes has already promoted the prosperity of various fields of scientific researches especially but not limited in energy storage and ***,cation intercalation can improve the interlayer spacing of MXenes resulting in tunable physical and chemical ***,the synchrotron radiation X-ray characterizations have also shown high potential on exploring the property and structu re of cation intercalated MXe *** review is mainly focused on the recent achievements of cation intercalated MXenes through different methods on energy storage ***-based X-ray absorption spectroscopic characterizations are emphasized to probe the local coordination and electronic structure in intercalated *** outlook of cation intercalation on MXenes and their applications are also discus sed.

关键词： 2D materials MXenes Cation intercalation XAFS Energy storage

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Unsaturated-sulfur-rich MoS2 nanosheets decorated on free-standing SWNT film： Synthesis, characterization and electrocatalytic application

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Nano Research 2016年第7期9卷 2079-2087页

作者： Daobin Liu Weiyu Xu Qin Liu Qun He Yasir A. Haleem changda wang Ting Xiang Chongwen Zou wangsheng Chu Jun Zhong Zhiqiang Niu Li Song National Synchrotron Radiation Laboratory CAS Hefei Science Center University of Science and Technology of China Hefei 230029 China jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials Laboratory (FUNSOM) Soochow University Suzhou 215123 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering Nankai University Tianjin 300071 China

Herein, we report a bottom-up solvothermal route to synthesize a flexible, highly efficient MoS2@SWNT electrocatalyst for hydrogen evolution reactions （HER）. Characterization revealed that branchqike MoS2 nanosheets containing sulfur- rich sites were in situ uniformly dispersed on free-standing single-walled carbon nanotube （SWNT） film, which could expose more unsaturated sulfur atoms, allowing excellent electrical contact with active sites. The flexible catalyst exhibited excellent HER performance with a low overpotential （-150 mV at 10 ma/cm2） and small Tafel slope （4l mV/dec）. To further explain the improved performance, the local electronic structure was investigated by X-ray absorption near-edge structure （XANES） analysis, proving the presence of unsaturated sulfur atoms and strong electronic coupling between MoS2 and SWNT. This study provides an in-situ synthetic route to create new multifunctional flexible hybridized catalysts and useful insights into the relationships electronic structure, and properties among the catalyst microstructure,

关键词： unsaturated-sulfur-rich MoS2 flexible X-ray absorption near-edgestructure hydrogen evolution

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In situ trapped high-density single metal atoms within graphene： Iron-containing hybrids as representatives for efficient oxygen reduction

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Nano Research 2018年第4期11卷 2217-2228页

作者： Daobin Liu Chuanqiang Wu Shuangming Chen Shiqing Ding Yaofeng Xie changda wang Tao wang Yasir A. Haleem Zia ur Rehman Yuan Sang Qin Liu Xusheng Zheng Yu wang Binghui Ge Hangxun Xu Li Song National Synchrotron Radiation Laboratory Department of Physics Department of Polymer Science and Engineering CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230026 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Atomically dispersed catalysts have attracted attention in energy conversion applications because their efficiency and chemoselectivity for special catalysis are superior to those of traditional catalysts. However, they have limitations owing to the extremely low metal-loading content on supports, difficulty in the precise control of the metal location and amount as well as low stability at high temperatures. We prepared a highly doped single metal atom hybrid via a single-step thermal pyrolysis of glucose, dicyandiamide, and inorganic metal salts. High-angle annular dark field-scanning transmission electron microscopy （HAADF-STEM） and X-ray absorption fine structure spectroscopy （XAFS） revealed that nitrogen atoms doped into the graphene matrix were pivotal for metal atom stabilization by generating a metal-Nx coordination structure. Due to the strong anchoring effect of the graphene matrix, the metal loading content was over 4 wt.% in the isolated atomic hybrid （the Pt content was as high as 9.26 wt.% in the Pt-doped hybrid）. Furthermore, the single iron-doped hybrid （Fe@N-doped graphene） showed a remarkable electrocatalytic performance for the oxygen reduction reaction. The peak power density was - 199 mW·cm-2 at a current density of 310 mA·cm-2 and superior to that of a commercial Pt/C catalyst when it was used as a cathode catalyst in assembled zinc-air batteries. This work offered a feasible approach to design and fabricate highly doped single metal atoms （SMAs） catalysts for potential energy applications.

关键词： single metal atoms (SMAs) high loading X-ray absorption fine structure spectroscopy (XAFS) high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) oxygen reduction reaction(ORR)

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Biomass-derived hard carbon microtubes with tunable apertures for high-performance sodium-ion batteries

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Nano Research 2023年第4期16卷 4874-4879页

作者： Pin Song Shiqiang Wei Jun Di Jun Du Wenjie Xu Daobin Liu changda wang Sicong Qiao Yuyang Cao Qilong Cui Pengjun Zhang Liaobo Ma Jiewu Cui Yan wang Yujie Xiong Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Engineering Research Center of Carbon NeutralityAnhui Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Hefei University of TechnologyHefei 230009China National Synchrotron Radiation Laboratory Chinese Academy of Sciences(CAS)Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230029China School of Chemistry and Chemical Engineering National Special Superfine Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China

Sodium-ion batteries(SIBs)are considered the most up-and-coming complements for large-scale energy storage devices due to the abundance and cheap ***,due to the bigger radius,it is still a great challenge to develop anode materials with suitable space for the intercalation of sodium ***,we present hard carbon microtubes(HCTs)with tunable apertures derived from low-cost natural kapok fibers via a carbonization process for *** resulted HCTs feature with smaller surface area and shorter Na+diffusion path benefitting from their unique micro-nano *** importantly,the wall thickness of HCTs could be regulated and controlled by the carbonization *** a high temperature of 1,600℃,the carbonized HCTs possess the smallest wall thickness,which reduces the diffusion barrier of Na+and enhances the reversibility Na+*** a result,the 1600HCTs deliver a high initial Coulombic efficiency of 90%,good cycling stability(89.4%of capacity retention over 100 cycles at 100 mA·g^(−1)),and excellent rate *** work not only charts a new path for preparing hard carbon materials with adequate ion channels and novel tubular micro-nano structures but also unravels the mechanism of hard carbon materials for sodium storage.

关键词： hard carbon kapok fibers sodium-ion batteries(SIBs) reversible capacity long cycle life

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