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Dislocation behavior in Cu single crystal joints under the ultrasonically excited high-strain-rate deformation

Journal of materials Science & Technology 2023年第10期141卷 66-77页

作者： Qiuchen ma jingyuan ma Jianli Zhou Xiaoxiong Zheng Hongjun Ji The State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology at ShenzhenShenzhen 518055China Sauvage Laboratory for Smart materials Shenzhen Key Laboratory of Flexible Printed Electronics TechnologySchool of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology at ShenzhenShenzhen 518055China

The coupling effects of ultrasonic excitation and high-strain-rate deformation are the core factors for weld formation during ultrasonic welding.However,interfacial deformation behavior still shrouds in uncer-tainty because of the contradictory features between mutual dislocation retardation caused by severely frictional deformation and ultrasonic-accelerated dislocation motion.[101]and[111]-oriented Cu single crystals which tended to form geometrically necessary boundaries(GNBs)were selected as the welding substrates to trace the uniquely acoustoplastic effects in the interfacial region under the ultrasonically excited high-strain-rate deformation.It was indicated that for a low energy input,micro-welds localized at the specific interface region,and equiaxed dislocation cells substituting for GNBs dominated in the ini-tial single crystal rotation region.As the welding energy increased,continuous shear deformation drove the dynamic recrystallization region covered by equiaxed grains to spread progressively.Limited discrete dislocations inside the recrystallized grains and nascent dislocation cells at the grain boundaries were ob-served in[101]and[111]joints simultaneously,suggesting that the ultrasonic excitation promoted motion of intragranular dislocation and pile-up along the sub-grain boundaries.The interfacial morphology be-fore and after expansion of recrystallization region all exhibited the weakening of orientation constraint on dislocation motion,which was also confirmed by the similar micro-hardness in joint interface.The first-principle calculation and applied strain-rate analysis further revealed that ultrasonic excitation en-hanced dislocation slipping,and enabled dislocation motion to accommodate severe plastic deformation at a high-strain-rate.

关键词： Acoustoplasticity Ultrasonic welding Cu single crystal Dynamic recrystallization Dislocation cell High-strain-rate deformation

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mass-producible low-cost flexible electronic fabrics for azo dye wastewater treatment by electrocoagulation

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中国化学工程学报:英文版 2023年第7期59卷 222-230页

作者： Chaoyi Yin jingyuan ma Jian Qiu Ruifang Liu Long Ba State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast UniversityNanjing 210096China State Key Laboratory of materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneCollege of Chemical EngineeringNanjing Tech UniversityNanjing 210009China

Electrocoagulation is progressively becoming an ecologically friendly water treatment method owing to its lack of secondary pollution,high active ingredient concentration,high treatment effectiveness,simple equipment,and simplicity of automated control implementation.Herein,electrocoagulation is offered as a method for treating wastewater containing azo dyes using a revolutionary flexible electronic fabric that can be mass-producible at a reasonable price.A computer-controlled machine embroiders 316L stainless steel fiber(316L SSF)onto an insulating fabric to manufacture a flexible electronic device of cathode and anode with a monopolar arrangement on the fabric surface.Using methyl orange(MO)solution to simulate azo dye wastewater,the decolorization rate of 500 ml MO reached 99.25% under the conditions of 50 mg·L^(-1)initial mass concentration,120 min electrolysis time,15 ma·g^(-1)current density,1 cm electrode spacing,0.1 mol·L^(-1)NaCl,pH 7.6,200 r·min^(-1)rotational speed of the stirrer,and 22-25℃ room temperature.In addition,it is feasible to embroider flexible electronic fabrics with varied sizes and numbers of electrodes based on the amount of treated sewage to increase the degradation rate,which has significant practical application value.

关键词： Flexible electronic fabric 316L Stainless steel fiber Embroidery Electrocoagulation Wastewater treatment

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Tuning the coordination environment of single-atom catalyst M-N-C towards selective hydrogenation of functionalized nitroarenes

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Nano Research 2022年第1期15卷 519-527页

作者： Dan Zhou Leilei Zhang Xiaoyan Liu Haifeng Qi Qinggang Liu Ji Yang Yang Su jingyuan ma Jianzhong Yin Aiqin Wang School of Chemical Engineering State Key Laboratory of Fine ChemicalsDalian University of TechnologyDalian 116024China CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Shanghai Synchrotron Radiation Facility Zhangjiang Laboratory(SSRFZJLab)Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Fine-tuning of the coordination environment of single-atom catalysts(SACs)is effective to optimize their catalytic performances,yet it remains challenging due to the vulnerability of SACs.Herein,we report a new approach to engineering the coordination environment of M-N-C(M=Fe,Co,and Ni)SACs by using glutamic acid as the N/C source and pyrolysis atmosphere as a regulator.Compared with that in N2,NH3 was able to promote the doping of N at 7magnitude more active than state-of-the-art noble-metal-free M-N-C catalysts,demonstrating the great potential of engineering the coordination environment of SACs.

关键词： single-atom catalysts coordination environment Ni-N-C chemoselective hydrogenation pyrolysis atmosphere

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Enhanced H_(2) permeation and CO_(2) tolerance of self-assembled ceramic-metal-ceramic BZCYYb-Ni-CeO_(2) hybrid membrane for hydrogen separation

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Journal of Energy Chemistry 2023年第7期82卷 47-55,I0002页

作者： Jianqiu Zhu Jingzeng Cui Yuxuan Zhang Ze Liu Chuan Zhou Susu Bi jingyuan ma Jing Zhou Zhiwei Hu Tao Liu Zhi Li Xiangyong Zhao Jian-Qiang Wang Linjuan Zhang Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China Key Laboratory of Optoelectronic material and Device Department of PhysicsShanghai Normal UniversityShanghai 200234China State Key Laboratory of materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China max Planck Institute for Chemical Physics of Solids Nöthnitzer Strasse 40Dresden 01187Germany Shandong Energy Group Co. Ltd.Jinan 250014ShandongChina University of Chinese Academy of Sciences Beijing 100049China

Perovskite-type mixed protonic-electronic conducting membranes have attracted attention because of their ability to separate and purify hydrogen from a mixture of gases generated by industrial-scale steam reforming based on an ion diffusion mechanism.Exploring cost-effective membrane materials that can achieve both high H_(2) permeability and strong CO_(2)-tolerant chemical stability has been a major challenge for industrial applications.Herein,we constructed a triple phase(ceramic-metal-ceramic)membrane composed of a perovskite ceramic phase BaZr_(0.1)Ce_(0.7)Y_(0.1)Yb_(0.1)O_(3-δ)(BZCYYb),Ni metal phase and a fluorite ceramic phase CeO_(2).Under H_(2) atmosphere,Ni metal in-situ exsolved from the oxide grains,and decorated the grain surface and boundary,thus the electronic conductivity and hydrogen separation performance can be promoted.The BZCYYbNi-CeO_(2)hybrid membrane achieved an exceptional hydrogen separation performance of 0.53 mL min^(-1)cm^(-2) at 800℃ under a 10 vol% H_(2) atmosphere,surpassing all other perovskite membranes reported to date.Furthermore,the CeO_(2) phase incorporated into the BZCYYb-Ni effectively improved the CO_(2)-tolerant chemical stability.The BZCYYbNi-CeO_(2) membrane exhibited outstanding long-term stability for at least 80 h at 700℃ under 10 vol%CO_(2)-10 vol%H_(2).The success of hybrid membrane construction creates a new direction for simultaneously improving their hydrogen separation performance and CO_(2) resistance stability.

关键词： Hydrogen separation Triple phase hybrid membrane Mixed proton-electron conductor Chemical stability X-ray absorption spectra

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Boosting hydrogen peroxide production via establishment and reconstruction of single-metal sites in covalent organic frameworks

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Susmat 2023年第3期3卷 379-389页

作者： Shuai Yang Lanlu Lu Ji Li Qingqing Cheng Bingbao Mei Xuewen Li Jianing mao Panzhe Qiao Fanfei Sun jingyuan ma Qing Xu Zheng Jiang Shanghai Advanced Research Institute Chinese Academy of SciencesShanghaiChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of ScienceShanghaiChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiChina

Covalent organic frameworks(COFs)have been well developed in electrocatalytic systems owing to their controllable skeletons,porosities,and functions.However,the catalytic process in COFs remains underexplored,hindering an in-depth understanding of the catalytic mechanism.In this work,uniform Pt-N_(1)O_(1)Cl_(4)sites chelated via C-N and C=O bonds along the one-dimensional and open channels of TP-TTA-COF were established.Different from conventional single-metal sites constructed for the near-free platinum for hydrogen evolution,the as-constructed PtCl-COF showed 2e−oxygen reduction for H_(2)O_(2)production.We tracked the dynamic evolution process of atomic Pt sites in which Pt-N_(1)O_(1)Cl_(4)was transformed into Pt-N_(1)O_(1)(OH)_(2)using in situ X-ray adsorption.The theoretical calculations revealed that the strong Pt-support interaction in Pt-N_(1)O_(1)(OH)_(2)facilitated*OOH formation and thus led to higher selectivity and activity for the oxygen reduction reaction in the 2e−pathway.This work can expand the applications of COFs through the regulation of their local electronic states for the manipulation of the metal center.

关键词： covalent organic framework oxygen reduction reaction single-atom catalysis

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Sub-nanometer Pt_(2)In_(3) intermetallics as ultra-stable catalyst for propane dehydrogenation

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能源化学:英文版 2023年第8期83卷 304-312,I0009页

作者： Yanan Xing Guiyue Bi Xiaoli Pan Qike Jiang Yuanlong Tan Yang Su Leilei Kang Bonan Li Lin Li Aiqin Wang jingyuan ma Xiaofeng Yang Xiao Yan Liu Tao Zhang CAS Key Laboratory of Science and Technology on Applied Catalysis ichEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Pt-based catalysts are the typical industrial catalysts for propane dehydrogenation(PDH),which still suffer from insufficient lo ng-term durability due to the structu ral instability and coke deposition.A commercial γ-Al_(2)O_(3) supported thermally robust sub-nanometer Pt2In3intermetallic catalyst with atomically ordered structure and rigorously separated Pt single atoms was fabricated,which showed outstanding robustness in 240 h long-term operation at 600℃ with the deactivation rate constant kdas low as0.00078 h^(-1), ranking among the lowest reported values.Based on various in situ characterizations and theoretical calculations,it was proved that the catalyst stability not only resulted from the separated Pt single-atom sites but also significantly affected by the distance of adjacent Pt atoms.An increasing distance to 3.25 A in the Pt_(2)In_(3)could induce a weak π-adsorption configuration of propylene on Pt sites,which facilitated the desorption of propylene and restrained the side reactions like coking.

关键词： Propane dehydrogenation Propylene Pt-In catalyst Intermetallic compounds Pt_(2)ln_(3)

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嵌合抗原受体T细胞治疗多发性骨髓瘤研究进展

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白血病．淋巴瘤 2024年第5期33卷 265-269页

作者：马静远郝牧中国医学科学院血液病医院(中国医学科学院血液学研究所)、实验血液学国家重点实验室、国家血液系统疾病临床医学研究中心、细胞生态海河实验室天津300020 天津医学健康研究院天津301600

多发性骨髓瘤(MM)是第二常见的血液系统恶性肿瘤。近年来,蛋白酶体抑制剂、免疫调节药物等新一代药物显著改善了MM患者的预后,中位生存期延长至3~6年。同时,嵌合抗原受体T细胞(CAR-T)免疫疗法在治疗复发难治MM方面取得了巨大进展,但高... 详细信息

多发性骨髓瘤(MM)是第二常见的血液系统恶性肿瘤。近年来,蛋白酶体抑制剂、免疫调节药物等新一代药物显著改善了MM患者的预后,中位生存期延长至3~6年。同时,嵌合抗原受体T细胞(CAR-T)免疫疗法在治疗复发难治MM方面取得了巨大进展,但高复发率和较短的缓解时间仍然是CAR-T治疗亟待解决的问题。需探究影响CAR-T疗效和安全性的因素,优化CAR-T治疗策略。文章对2023年第65届美国血液学会(ASH)年会报道的关于CAR-T治疗MM的前沿进展进行总结。

关键词：多发性骨髓瘤嵌合抗原受体T细胞分子靶向治疗治疗结果

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Unveiling the mechanism of charge compensation in Li_(2)Ru_(x)Mn_(1-x)O_(3)by tracking atomic structural evolution

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Journal of Energy Chemistry 2022年第12期75卷 267-275,I0007页

作者： Ji Li Hongzhou Liu Shun Zheng Yande Li Daming Zhu Fanfei Sun jingyuan ma Songqi Gu Panzhe Qiao Shuai Yang Xianlong Du Xiaosong Liu Zhi Liu Bingbao Mei Zheng Jiang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Innovation Academy for Green manufacture Chinese Academy of SciencesBeijing 100190China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029AnhuiChina

The relationship between the structural evolution and redox of Li-rich transition-metal layered oxides(LLOs)cathodes remains ambiguous,obstructing the development of high-performance lithium-ion(Li^(+))battery.Herein,the coherent effects of local atomic and electronic structure in Li_(2)Ru_(x)Mn_(1-x)O_(3)(LRMO)with a wide voltage window(1.3–4.8 V)is identified by in situ X-ray absorption fine spectroscopy(XAFS)and chemometrics.We not only skillfully separated the redox active structures to track the electrochemical path,but also visualized the coupling mechanism between the evolution of Ru-Ru dimer and the(de)excitation of cations and anions.Furthermore,introducing manganese triggers the“heterogeneity”of coordination environment and electronic structure between Ru and Mn after discharge to 3 V.The change of thermodynamic and kinetic paths affects the relithiation,and further leads to the hysteresis of the anion activation structure relaxation of Li_(2)Ru_(0.4)Mn_(0.6)O_(3)relative to Li_(2)RuO_(3)(LRO).Additionally,it is demonstrated that the high charge cut-off voltage restrains the relaxation of anionic active structure in LRO from a new perspective through comparative experiments.Our work associates the evolution of atomic structure with charge compensation and negative electrochemical reactions such as voltage hysteresis(VH)and capacity attenuation,deepening the understanding electrochemical reaction mechanism of LLOs during the first cycle and providing a theoretical support for the further design and synthesis of high-efficiency cathodes.

关键词： Li-rich transition-metal layered oxides In situ XAFS Ru-Ru dimer Atomic structure Charge compensation

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基于二阶注意力的Siamese网络视觉跟踪算法

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北京航空航天大学学报 2024年第3期50卷 739-747页

作者：侯志强陈茂林马靖媛郭凡余旺盛马素刚西安邮电大学计算机学院西安710121 西安邮电大学陕西省网络数据分析与智能处理重点实验室西安710121 空军工程大学信息与导航学院西安710077

为提升基于Siamese网络视觉跟踪算法的特征表达能力和判别能力,以获得更好的跟踪性能,提出了一种轻量级的基于二阶注意力的Siamese网络视觉跟踪算法。使用轻量级VGG-Net作为Siamese网络的主干,获取目标的深度特征;在Siamese网络的末端... 详细信息

为提升基于Siamese网络视觉跟踪算法的特征表达能力和判别能力,以获得更好的跟踪性能,提出了一种轻量级的基于二阶注意力的Siamese网络视觉跟踪算法。使用轻量级VGG-Net作为Siamese网络的主干,获取目标的深度特征;在Siamese网络的末端并行使用所提残差二阶池化网络和二阶空间注意力网络,获取具有通道相关性的二阶注意力特征和具有空间相关性的二阶注意力特征;使用残差二阶通道注意力特征和二阶空间注意力特征,通过双分支响应策略实现视觉跟踪。利用GOT-10k数据集对所提算法进行端到端的训练,并在OTB100和VOT2018数据集上进行验证。实验结果表明:所提算法的跟踪性能取得了显著提升,与基准算法SiamFC相比,在OTB100数据集上,精度和成功率分别提高了0.100和0.096,在VOT2018数据集上,预期平均重叠率(EAO)提高了0.077,跟踪速度达到了48帧/s。

关键词： Siamese网络视觉跟踪残差二阶池化网络二阶空间注意力网络双分支响应策略

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Highly π-extended copolymer as additive-free hole- transport material for perovskite solar cells

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Nano Research 2018年第1期11卷 185-194页

作者： Jie Liu Qianqing Ge Weifeng Zhang jingyuan ma Jie Ding Gui Yu Jinsong Hu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CASResearch/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing 100049 China

Organolead halide perovskite solar ceils have achieved a certified power- conversion efficiency （PCE） of 22.1% and are thus among the most promising candidates for next-generation photovoltaic devices. To date, most high-efficiency perovskite solar cells have employed arylamine-based hole-transport materials （HTMs）, which are expensive and have a low mobility. The complicated doping procedures and the potentially stability-adverse dopants used in these HTMs are among the major bottlenecks for the commercialization of perovskite solar cells （PSCs）. Herein, we present a polythiophene-based copolymer （PDVT-10） with a hole mobility up to 8.2 cm2-V-l.s-1 and a highest occupied molecular orbital level of -5.28 eV as a hole-transport layer （HTL） for a PSC. A device based on this new HTM exhibited a high PCE of 13.4% under 100 mW-cm-2 illumination, which is one of the highest PCEs reported for the dopant-free polymer-based HTLs. Moreover, PDVT-10 exhibited good solution processability, decent air stability, and thermal stability, making it a promising candidate as an HTM for PSCs.

关键词： perovskite solar cell,hole-transport layer,dopant-free,PDVT-IO,stability

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