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Efficient and selective H_(2.O_(2.production through uranyl-assisted photocatalytic oxygen reduction reaction process in a uranium-organic framework

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Science china Chemistry 2024年第7期67卷 2274-2281页

作者： jianxin Song Chao Liang Baoyu Li Xuemin Wang Min Lei Lisha Jiang Zhenyu Li Yugang {1. Jian {2. Zuju Ma Xing Dai Yanlong Wang Shuao Wang Wei Liu School of Environmental and materials {1. Yantai UniversityYantai 264005China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China School of Life and Environmental Sciences Shaoxing UniversityShaoxing 312000China School of Nuclear Science and technology Xi’an Jiaotong UniversityXi’an 710049China

Harnessing solar energy by photocatalytically converting oxygen and water into high-value-added H_(2.O_(2.is a promising way of alleviating both environmental and energy *** is worth noting that suppressing detrimental side reactions,such as the generation of·O_(2.^(-),is a critical approach to enhancing H_(2.O_(2.***,a 2.fold interpenetrating 3D uranium-organic framework(YTU-W-1.was developed and introduced for photocatalytic H_(2.O_(2.*** material demonstrates a different photocatalytic mechanism when employing uranyl as an initiator,as compared with the conventional semiconductor photocatalytic pathway involving photo-generated charge *** from the strong hydrogen abstraction effect of the U≡O·and the direct one-step oxygen reduction pathway,YTU-W-1.exhibits enhanced photocatalytic performance for H_(2.O_(2.production with yield efficiency of 2.1.mol h^(-1.g^(-1..Furthermore,YTU-W-1.displays a high H_(2.O_(2.selectivity of 68%,confirmed by rotating ring-disk electrode(RRDE)*** were used to elucidate the critical role of uranyl in the photocatalytic oxygen reduction reaction for H_(2.O_(2.*** research introduces an innovative approach to photo-driven H_(2.O_(2.production,underscoring the potential for heterogeneous catalysts to engage in photocatalytic reactions independently of photogenerated charge carriers.

关键词： uranyl metal-organic frameworks oxygen reduction reaction photocatalytic H_(2.O_(2.synthesis

The 2.(nd)Asian Conference on Porphyrins,Phthalocyanines and Related materials

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Chinese Chemical Letters 2024年第7期35卷 1-3页

作者： Gaojie Zhu Zhen Yang Shijun Li Weihua Zhu Rui Cao Junlong zhang Jianzhang Zhao Jonathan L.Sessler Xunjin Zhu {2. Song Yongshu xie Jianzhuang Jiang Key Laboratory for Advanced materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China College of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhou 311121China School of Chemistry and Chemical engineering Jiangsu UniversityZhenjiang 212013China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710119China beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China Department of Chemistry The University of TexasAustinTexas 78712-1224United States Department of Chemistry and Institute of Advanced materials Hong Kong Baptist UniversityHong Kong 999077China Key Laboratory of Chemical Biology and Traditional Chinese Medicine(Ministry of Educational of china) Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China beijing Advanced Innovation Center for {1.s Genome {2. Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

In the past decades,porphyrins,phthalocyanines and related materials have attracted significant attention due to their diverse and brilliant structures[1.2.,as well as their unique electronic structures and photophysi... 详细信息

关键词： cyanine phthalocyanine Porphyrin

Strengthening effect of Cu-rich phase precipitation in 1.Cr9Ni3CuNbN austenitic heat-resisting steel

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Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 141-147页

作者： Chengyu CHI Hongyao YU jianxin {1. {2. xie Zhengqiang CUI Xiaofang CHEN Fusheng LIN High Temperature materials Research Laboratories School of Materials Science and EngineeringUniversity of Science and Technology Beijing Beijing 100083 China Shanghai Power Equipment Research Institute Shanghai 200240 China

The Cu-containing austenitic heat-resistant steel 1.Cr9Ni3CuNbN, which is being used as superheater and reheater tube material for modern ultra-super-critical （USC） power plants all over the world, has been investigated at 650 ℃ long time aging till 1. 000 h. SEM, TEM and 3DAP （three dimensional atom probe） have been used to follow microstructural changes with mechanical property variations. Experimental results show that Cu-rich phase and MX precipitate in the grains as well as M 2. C 6 precipitates at grain boundaries are the main precipitation strengthening phases in this steel. Among them Cu-rich phase is the most important strengthening phase. Homogeneous distribution of very fine nano-size Cu-rich phase has been formed at very early stage of 650 ℃ aging （less than 1.h）. Cu atoms gradually concentrate to Cu-rich particles and the other elements （such as Fe, Cr, Ni etc） diffuse away from Curich particles to γ-matrix with the increasing of aging time at 650 ？ C. The growth rate of Cu-rich phase at 650 ℃ long time aging is very slow and the average diameters of Cu-rich phase have been determined by TEM method. Cu-rich phase keeps in about 30 nm till 650 ℃ aging for 1. 000 h. It shows that nano-size Cu-rich phase precipitation strengthening can be kept for long time aging at 650 ℃ because of its excellent stability at high temperatures. According to structure stability study and mechanical properties determination results the Cu-rich phase precipitation sequence and its strengthening mechanism model have been suggested and discussed.

关键词： Austenitic heat-resistant steel Precipitation strengthening Cu-rich phase MX M 2. C 6

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超高W含量NiW中/重合金热加工行为研究

稀有金属材料与工程 2024年第5期53卷 1371-1377页

作者：曹国鑫董建新张胜姚志浩解国良聂志华马腾飞付宝全北京科技大学材料科学与工程学院北京100083 西安聚能高温合金材料科技有限公司陕西西安710299 北京理工大学材料学院北京100081 衢州学院浙江省空气动力装备技术重点实验室浙江衢州324000

采用Gleeble-1.00D研究了Ni-42.-1.Co-1.o(质量分数,%)中/重合金(MHA)在1.50~1.00℃和应变速率0.001.1.s^(-1.下流变行为和微观组织演化规律。结果表明,该合金初始组织由面心立方基体和初生σ相构成。流变应力对变形温度和应变速率敏感... 详细信息

采用Gleeble-1.00D研究了Ni-42.-1.Co-1.o(质量分数,%)中/重合金(MHA)在1.50~1.00℃和应变速率0.001.1.s^(-1.下流变行为和微观组织演化规律。结果表明,该合金初始组织由面心立方基体和初生σ相构成。流变应力对变形温度和应变速率敏感,在较高应变速率1.^(-1.下,应力-应变曲线呈现出典型的动态回复软化特征,而在较低应变速率0.1.0.001.s^(-1.下变形应力-应变曲线呈现出典型动态再结晶软化特征。基于应力-应变曲线建立了Arrhenius本构方程,并计算得到Ni-42.-1.Co-1.o合金热变形激活能为446.2.kJ/mol。基于动态材料模型构建该合金热加工图,发现在1.00℃高应变速率下存在失稳区。通过微观组织分析,揭示其动态再结晶机制主要为不连续动态再结晶,σ相促进动态再结晶优先在其周围形核。最终优化获得了Ni-42.-1.Co-1.o合金最佳的热加工窗口:1.50~1.00℃,应变速率0.1.0.01.s^(-1.。

关键词：中重合金镍基合金热加工本构关系

Discovery of aluminum alloys with ultra-strength and high-toughness via a property-oriented design strategy

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Journal of materials Science & {1. 2022年第3期98卷 33-43页

作者： Lei Jiang Changsheng Wang Huadong Fu Jie Shen Zhihao {1. {2. xie beijing Advanced Innovation Center for {1.s Genome {2. University of Science and Technology BeijingBeijing 100083China beijing Laboratory of Metallic {1.s and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory for Advanced materials Processing(MOE) University of Science and Technology BeijingBeijing 100083China

Aluminum alloys with ultra-strength and high-toughness are fundamental structural materials applied in the aerospace *** to the intrinsic restriction between strength and toughness,optimizing a desirable combination of these conflicting properties is always challenging in material *** this study,{2.{2.sets of data were curated based on the characteristics of high-strength and high-toughness aluminum alloys in the ***,a machine learning design system(MLDS)with a property-oriented design strategy was established to rapidly discover novel aluminum alloys with ductility and toughness indexes(with elongationδ=8%–{2.%and fracture toughness K_(IC)=33–35 MPa·m^({2.2.)comparable to those of current state-of-the-art AA7{2.6 aluminum alloys when the ultimate tensile strength(UTS)exceeded approximately {2.0 MPa,with values reaching 700–750 *** the MLDS for experimental verification,three typical candidate alloys show satisfactory performance with UTS of 707–736 MPa,δof 7.8%–9.5%,and K_(IC)of 32.2.33.9 MPa·m^({2.2..The high contents of Mg and Zn alloying elements in the novel alloys form abundantη'phases,which produce a significant hardening effect,while the reasonable matching of Cr,Mn,Ti and Zr dispersoids refines the grain *** decreased Cu content compared with that in the AA7{2.6 alloy inhibits the formation of theσphase and S phase,so that the alloys show high toughness.

关键词： Aluminum alloy Machine learning Composition design Hardening mechanism Toughness

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高功率1.60 nm垂直腔面发射激光器

光学学报 2024年第2期44卷 229-235页

作者：郑妹茵渠红伟周旭彦董风鑫张建心隋佳桐孟凡胜谢中华王海玲王宇飞齐爱谊曲阜师范大学物理工程学院山东曲阜273165 潍坊先进光电芯片研究院山东潍坊261000 中国科学院半导体研究所固态光电信息技术重点实验室北京100083 潍坊学院物理与电子信息学院山东潍坊261061

为了提高1.60 nm垂直腔面发射激光器(VCSEL)的性能,本文对大功率1.60 nm VCSEL进行了理论模拟和实验研究。计算得到红移速度为0.40 nm/K,据此确定增益和腔模失配量为-2. nm。对比分析了6种不同InGaAs组分和厚度的量子阱,以及3种不同势... 详细信息

为了提高1.60 nm垂直腔面发射激光器(VCSEL)的性能,本文对大功率1.60 nm VCSEL进行了理论模拟和实验研究。计算得到红移速度为0.40 nm/K,据此确定增益和腔模失配量为-2. nm。对比分析了6种不同InGaAs组分和厚度的量子阱,以及3种不同势垒材料的增益特性和输出特性,模拟结果表明,应变补偿的InGaAs/GaAsP量子阱有源区在温度稳定性、阈值电流以及功率方面更有优势。对P型分布式布拉格反射镜(DBR)进行优化设计,优化DBR渐变层厚度和对数,有助于获得更好的输出特性。采用金属有机化学气相沉积生长了InGaAs/GaAsP应变补偿量子阱结构的VCSEL外延片,并制备了单管和阵列VCSEL,实验数据和理论分析基本吻合。实验测得,2.8单元VCSEL阵列在4.5 A电流下,连续输出功率为2.62.W,最高电光转换效率为36.8%,5 mm×5 mm VCSEL阵列准连续条件下(脉宽为1.0μs,占空比为1.),且在1.0 A电流下,获得峰值功率为53.4 W。

关键词：垂直腔面发射激光器高功率应变补偿分布式布拉格反射镜效率

Synthesis, Growth, and Characterization of a New Thiourea and Bismuth Chloride Complex with Excellent Nonlinear Optical Properties

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Transactions of Tianjin university 2018年第6期24卷 532-537页

作者： Liang zhang {1. Zhou Baohong Hou Qiuxiang Yin Chuang {2. School of Chemical engineering and {1. Tianjin University Tianjin 300072 China National engineering Research Center of Industrial Crystallization {1. Tianjin UniversityTianjin 300072 China National Collaborative Innovation Center of Chemical Science and engineering (Tianjin) Tianjin 300072 China

Crystals of a new organometallic nonlinear optical （NLO） compound, di-ta-chloro-bis[chlorotri（thiourea）bismuth（Ⅲ）]- pentachloro（thiourea）bismuth-ate（Ⅲ）（DCBPB）, have been successfully grown from formic acid aqueous solutions of thio-urea and bismuth chloride by a slow evaporation technique. The crystal structure and atomic composition of DCBPB have been confirmed by single crystal X-ray diffraction （SCXRD）, Fourier transform infrared spectra, and elemental analysis. The SCXRD results proved that DCBPB crystallizes in triclinic space group P1.with unit cell dimensions of a = 7.0606（2. A, b = 8.81.6（4） A, c = 1..32.7（8） A, a = 99.2.2.4）°, fl = 95.309（3）°, ）/= 1.5.856（3）°, and Z= 2. DCBPB crystal exhibits excel-lent transmittance from 500 to 2.00 nm and green fluorescence with maximum emission at 508 nm. The thermogravimetric-differential scanning calorimetry （TG-DSC） analysis indicates that a solid-phase reaction took place at 1.0.1.℃, whereas the decomposition temperature of the crystal material was 1.9℃. The NLO property obtained by the Kurtz powder test showed that the second harmonic generation efficiency of DCBPB crystal is two-seventh of KDP crystal.

关键词： NLO Organometallic Thiourea Bismuth chloride TG-DTA

新型耐热合金SP2.1.组织与性能的关联性

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金属学报 2023年第6期59卷 797-811页

作者：梁凯姚志浩谢锡善姚凯俊董建新北京科技大学材料科学与工程学院北京100083

针对新型SP2.1.耐热合金,通过一系列持久及冲击实验,研究了其在不同温度和时间时效处理后组织与性能之间的关联性。结果表明,SP2.1.合金具有优良的高温组织稳定性,在时效过程中会析出富Cu相、MX相、NbCrN相和M_(2.)C_(6)等多种纳米级析... 详细信息

针对新型SP2.1.耐热合金,通过一系列持久及冲击实验,研究了其在不同温度和时间时效处理后组织与性能之间的关联性。结果表明,SP2.1.合金具有优良的高温组织稳定性,在时效过程中会析出富Cu相、MX相、NbCrN相和M_(2.)C_(6)等多种纳米级析出相。在时效早期,随着时效温度升高和时效时间的延长,析出相迅速增多,由于析出相的强化作用,合金的强度迅速增加;同时,合金的冲击韧性显著降低,并发生沿晶断裂,JMA相变动力学模型定量计算表明其主要与M_(2.)C_(6)碳化物在晶界的连续析出与长大有关。在时效后期,析出相逐渐保持稳定,无有害相析出,晶粒度始终保持在4.5~5级,优异的高温组织稳定性使得SP2.1.耐热合金在时效后期具有稳定的力学性能,650和700℃的1.1.^(5) h持久强度分别达到1.0和70 MPa级别,可实现对HR3C、Super304H等同类耐热合金的国产替代。

关键词： SP2.1.耐热合金长期时效析出相持久强度性能

Encapsulation of polyethylene glycol in cellulose-based porous capsules for latent heat storage and light-to-thermal conversion

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Frontiers of Chemical Science and engineering 2023年第8期17卷 1038-1050页

作者： Jiangwei Li lina Meng Jiaxuan Chen Xu Chen Yonggui Wang Zefang Xiao Haigang Wang Daxin Liang Yanjun {1. Key Laboratory of Bio-based material Science and {1.(Ministry of Education) College of Material Science and EngineeringNortheast Forestry UniversityHarbin 150040China

Phase change materials are potential candidates for the application of latent heat ***,we fabricated porous capsules as shape-stable materials from cellulose-based polyelectrolyte complex,which were first prepared using cellulose 6-(N-pyridinium)hexanoyl ester as the cationic polyelectrolyte and carboxymethyl cellulose as the anionic polyelectrolyte to encapsulate polyethylene glycol by the vacuum impregnation ***,the multi-walled carbon nanotube or graphene oxide,which were separately composited into the polyelectrolytes complex capsules to enhance thermal conductivity and light-to-thermal conversion *** capsules owned a typical core–shell structure,with an extremely high polyethylene glycol loading up to 34.33 g∙g^(‒{2..After loading of polyethylene glycol,the resulted cellulose-based composite phase change materials exhibited high thermal energy storage ability with the latent heat up to {2.2.2.J∙g^(‒{2.,which was 98.5%of pure polyethylene *** results showed that the composite phase change materials demonstrated good form-stable property and thermal ***,studies involving light-to-thermal conversion determined that composite phase change materials exhibited outstanding light-to-thermal conversion *** their exceptional comprehensive features,innovative composite phase change materials generated from cellulose presented a highly interesting choice for thermal management and renewable thermal energy storage.

关键词： cellulose polyelectrolytes phase change materials thermal energy storage light-to-thermal conversion