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Room-temperature synthesis of full-component APbX_(3)perovskite nanocrystal inks for optoelectronic applications

Journal of Energy Chemistry 2024年第5期92卷 87-94页

作者： Xinyu Zhao Du Li xuliang zhang Hehe Huang Chenyu Zhao Wanli Ma Jianyu Yuan Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123JiangsuChina Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Soochow UniversitySuzhou 215123JiangsuChina Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123JiangsuChin

Lead halide perovskite nanocrystals(PNCs)have received great research interests due to their excellent optoelectronic properties.However,high temperature,inert gas protection and insulating long-chain ligands are used during the conventional hot-injection synthesis of PNCs,which limits their practical applications.In this work,we first develop a simple and scalable polar-solvent-free method for the preparation of full-component APbX_(3)(A=Cs,methylammonium(MA),formamidinium(FA),X=Cl,Br,I)PNCs under ambient condition.Through an exothermic reaction between butylamine(BA)and propionic acid(PA)short ligands,the PbX_(2) precursors could be well dissolved without use of any polar solvent.Meanwhile,the relatively lower growth rate of PNCs in our room-temperature reaction enables us to modulate the synthetic procedure to enhance the scalability(40-fold)and achieve large-scale synthesis.The resultant short ligands passivated PNC inks are compatible with varying solution depositing technique like spray coating for large-area film.Finally,we showcase that adopting the as-prepared MAPbI_(3) PNC inks,a self-powered photodetector is fabricated and shows a high photoresponsivity.These results demonstrate that our ambient-condition synthetic approach can accelerate the preparation of tunable and ready-to-use PNCs towards commercial optoelectronic applications.

关键词： Room-temperaturesynthesis Perovskite nanocrystals Short-chainligands Large-scale Photodetector

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In Situ Iodide Passivation Toward Efficient CsPbI_(3) Perovskite Quantum Dot Solar Cells

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Nano-Micro Letters 2023年第10期15卷 28-39页

作者： Junwei Shi Ben Cohen‑Kleinstein xuliang zhang Chenyu Zhao Yong zhang Xufeng Ling Junjun Guo Doo‑Hyun Ko Baomin Xu Jianyu Yuan Wanli Ma Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow University199 Ren‑Ai RoadSuzhou Industrial ParkSuzhou 215123People’s Republic of China Department of Electrical and Computer Engineering University of British Columbia2329 West MallVancouverBC V6T 1Z4Canada Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University199 Ren‑Ai RoadSuzhou Industrial ParkSuzhou 215123People’s Republic of China Jiangsu Key Laboratory for Carbon‑Based Functional Materials&Devices Soochow University199 Ren‑Ai RoadSuzhou Industrial ParkSuzhou 215123People’s Republic of China

All-inorganic CsPbI_3 quantum dots(QDs) have demonstrated promising potential in photovoltaic(PV) applications. However, these colloidal perovskites are vulnerable to the deterioration of surface trap states, leading to a degradation in efficiency and stability. To address these issues, a facile yet effective strategy of introducing hydroiodic acid(HI) into the synthesis procedure is established to achieve high-quality QDs and devices. Through an in-depth experimental analysis, the introduction of HI was found to convert PbI_2 into highly coordinated [PbI_m]~(2-m), enabling control of the nucleation numbers and growth kinetics. Combined optical and structural investigations illustrate that such a synthesis technique is beneficial for achieving enhanced crystallinity and a reduced density of crystallographic defects. Finally, the effect of HI is further reflected on the PV performance. The optimal device demonstrated a significantly improved power conversion efficiency of 15.72% along with enhanced storage stability. This technique illuminates a novel and simple methodology to regulate the formed species during synthesis, shedding light on ofurther understanding solar cell performance, and aiding the design of future novel synthesis protocols for high-performance optoelectronic devices.

关键词： CsPbI_(3)perovskite quantum dots In situ passivation Surface trap states Perovskite solar cell

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Deep Duplex Thrust in the Sangzhi-Shimen Tectonic Belt,in the West Hunan and Hubei Areas

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Journal of Earth Science 2020年第1期31卷 79-90页

作者： xuliang zhang Dengfa He School of Energy Resources China University of Geosciences

Recent studies indicate that there is a large buried body developing in the Sangzhi-Shimen tectonic belt,which is between the Xuefeng intracontinental deformation system and the Xiangexi tectonic belt.In order to explore the tectonic evolution and main deformation-controlling factors of the buried body,we carried out a series of studies and built two new models based on the latest seismic data and fault-related fold theory.These new models show that the deformation of the buried body in the north segment of the study area is different from that in the middle-south segment.After further study,we found the main factors leading to these differences were:(1)the magnitude of the principal stress,(2)the range of tectonic movements,and(3)the morphology and depth of the basement detachment.Subsequently,with the physical simulation experiments,a 3D evolution model of the study area was built.

关键词： Sangzhi-Shimen tectonic belt concealed structures deformation-controlling factors basement detachment evolution model faulting

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风险社会理论下珠三角飞地经济发展的机遇与风险研究

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世界地理研究 2024年第5期33卷 123-135页

作者：周子航张衔春张旭亮香港中文大学地理与资源管理学系中国香港999077 浙江大学公共管理学院杭州310058 浙江大学区域协调发展研究中心杭州310058

区域发展的机遇与风险是现代社会中影响区域空间不均衡性、不确定性的重要因素。立足新马克思主义地理学与风险社会理论的对话,分析不确定性在区域治理中的效应与影响,以广德(英德)产业园为实证案例,通过半结构访谈与文本分析法,解析城... 详细信息

区域发展的机遇与风险是现代社会中影响区域空间不均衡性、不确定性的重要因素。立足新马克思主义地理学与风险社会理论的对话,分析不确定性在区域治理中的效应与影响,以广德(英德)产业园为实证案例,通过半结构访谈与文本分析法,解析城市企业家政府中发展与风险的伴随关系。结果表明:(1)在中国市场经济制度与科层制治理的国情背景下,省市关系是区域治理中应对风险、规避风险、善用风险的核心主体。(2)“效率-风险”是并行于“效率-公平”的一对影响区域发展的重要关系。(3)省政府在区域治理中发挥赋权城市发展并提供应对风险的托底保障功能,城市政府起到锐意发展、坚持本地空间积累优先的作用。本文通过建构风险社会的空间化分析框架,旨在将发展的不确定性引入地理学讨论,试图阐释中国语境下通过妥善应对不确定性而形成区域治理善治的原因。

关键词：风险社会不确定性区域治理新马克思主义地理学广德(英德)产业园

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New design principles for the bath towards chromate-and crack-free conversion coatings on magnesium alloys

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Journal of Magnesium and Alloys 2021年第2期9卷 505-519页

作者： Shangju Liao Baoxing Yu xuliang zhang Xiaopeng Lu Peng Zhou Chunyan zhang XiaoBo Chen Tao zhang Fuhui Wang Corrosion and Protection Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of Sciences62 Wencui RdShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RdShenyang 110819China Shanghai Spaceflight Precision Machinery Research Institute No.76 Guide RoadSongjiangShanghai 201600China School of Engineering RMIT UniversityCarltonVIC 3053Australia

Cracking and low thickness are major obstacles to the high corrosion performance of conversion coating on magnesium alloy.In this work,the ratio of total acidity to p H(TA/p H)was applied as an indicator,and new principles regarding the design of conversion bath were proposed.The treatment bath should be composed of species that can be categorized into two groups:the first group of species that react with Mg substrate to increase the local p H at the interface;the second group that precipitate and contributes to the growth of coating.The species belong to second group exists in a supersaturated state and its precipitation process is almost independent on the reactions of the species in first group.By this way,a thick and crack-free two-layered conversion coating is obtained.Moreover,the nature of the adjustment of TA/p H and the roles of the oxidizing agent and catalyst were discussed.

关键词： Phosphate conversion coating Design principles Magnesium alloy TA/pH Corrosion resistance

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特色小镇的理论剖析及其政策分类研究——基于浙江省的调查证据

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热带地理 2024年第2期44卷 269-279页

作者：胡晓辉林潭晨张天尧张旭亮南京师范大学地理科学学院江苏省地理信息资源开发与利用协同创新中心南京210023 哈尔滨工业大学(深圳)建筑学院深圳518055 浙江大学民营经济研究中心浙江大学区域协调发展研究中心杭州310030

特色小镇是当前中国推进新型城镇化战略的重要政策抓手和落地路径。它强调地方专业化经济和集聚经济的外部性,侧重通过政府支持引导来激发多方主体共同参与,以此构建生产、生活和生态融合的创新创业平台,推动人口城镇化和区域内生发展... 详细信息

特色小镇是当前中国推进新型城镇化战略的重要政策抓手和落地路径。它强调地方专业化经济和集聚经济的外部性,侧重通过政府支持引导来激发多方主体共同参与,以此构建生产、生活和生态融合的创新创业平台,推动人口城镇化和区域内生发展能力。然而,特色小镇的政策引导和扩散具有显著的“自上而下”性,使得地方实践面临诸多矛盾和问题。文章以浙江省134个省级特色小镇为研究对象,通过2017—2022年多次实地访谈、线上问卷和政策文本分析等方法,结合演化经济地理和集聚经济理论,对特色小镇的历史基础、产业属性和发展目标进行识别分析,归纳出具有类型差异的特色小镇,并提出相应政策干预建议。结果显示:浙江省特色小镇可大致分3类,第一类为政府主导的、面向新产业塑造的科技园区型小镇;第二类为企业主导的、面向传统产业升级的专业化市场型小镇;第三类为基于地方特有自然或社会文化资源的、面向旅游业发展的景区型小镇。最后,建议将演化经济地理思想纳入特色小镇发展实践中,重视历史、空间与地方作用,避免标准化、指标化的“一刀切”政策干预方式。

关键词：新型城镇化特色小镇集聚经济演化经济地理分类政策浙江省

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Prolonged lifetime and enhanced separation of photo- generated charges of nanosized α-Fe2O3 by coupling SnO2 for efficient visible-light photocatalysis to convert C02 and degrade acetaldehyde

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Nano Research 2017年第7期10卷 2321-2331页

作者： Zhijun Li Peng Luan xuliang zhang Yang Qu Fazal Raziq Jinshuang Wang Liqiang Jing Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University) Ministry of Education School of Chemistry and Materials Science International Joint Research Center for Catalytic Technology Heilongjiang University Harbin 150080 China

To develop efficient visible-light photocatalysis on α-Fe2O3, it is highly desirable to promote visible-light-excited high-energy-level electron transfer to a proper energy platform thermodynamically. Herein, based on the transient-state surface photovoltage responses and the atmosphere-controlled steady-state surface photovoltage spectra, it is demonstrated that the lifetime and separation of photogenerated charges of nanosized α-Fe2O3 are increased after coupling a proper amount of nanocrystalline SnO2. This naturally leads to greatly improved photocatalytic activities for CO2 reduction and acetaldehyde degradation. It is suggested that the enhanced charge separation results from the electron transfer from α-Fe2O3 to SnO2, which acts as a proper energy platform. Based on the photocurrent action spectra, it is confirmed that the coupled SnO2 exhibits longer visible-light threshold wavelength （-590 nm） compared with the coupled TiO2 （-550 nm）, indicating that the energy platform introduced by SnO2 would accept more photogenerated electrons from α-Fe2O3. Moreover, electrochemical reduction experiments proved that the coupled SnO2 possesses better catalytic ability for reducing CO2 and O2. These are well responsible for the much efficient photocatalysis on SnO2-coupled α-Fe2O3.

关键词： SnO2-Fe2O3 nanocomposite,electron transfer,visible-light photocatalysis,CO2 conversion,acetaldehyde degradation

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焦作市加强科技创新工作的路径与对策

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焦作大学学报 2024年第1期38卷 55-58,68页

作者：张许良中共焦作市委党校河南焦作454000

通过调查研究,总结了焦作市科技创新工作取得的成效,分析了存在的问题,借鉴了外地的先进经验,提出加强焦作市科技创新工作的路径与对策:建设科技城、建设科技创新共同体、开放合作创新、提高企业的创新能力、提升科技创新平台能级、强... 详细信息

通过调查研究,总结了焦作市科技创新工作取得的成效,分析了存在的问题,借鉴了外地的先进经验,提出加强焦作市科技创新工作的路径与对策:建设科技城、建设科技创新共同体、开放合作创新、提高企业的创新能力、提升科技创新平台能级、强化人才支撑保障、创造优越的生活环境和创新生态、建设大学城、中心城区建设科技创新型企业、加大政策支持力度。

关键词：科技创新创新能力创新平台创新生态

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碳排放权交易能促进地区能源结构低碳转型吗?

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兰州学刊 2024年第6期 52-64页

作者：方建春曾郎张旭亮浙江工业大学经济学院浙江大学未来区域发展实验室浙江大学区域协调发展研究中心

基于2005—2019年30个省(市、区)的面板数据,文章采用双重差分模型评估碳排放权交易政策(以下简称为碳交易政策)对能源结构低碳转型的影响,并深入探究了其传导机制。研究发现,碳交易政策能够显著减少碳排放,并积极推动能源结构向低碳方... 详细信息

基于2005—2019年30个省(市、区)的面板数据,文章采用双重差分模型评估碳排放权交易政策(以下简称为碳交易政策)对能源结构低碳转型的影响,并深入探究了其传导机制。研究发现,碳交易政策能够显著减少碳排放,并积极推动能源结构向低碳方向发展,其效果随时间逐渐显现。此外,碳交易政策还通过促进产业结构的调整,进一步推动了能源结构的低碳化。进一步研究表明,碳交易政策在不同试点地区的影响存在显著差异,其中北京、天津和重庆的政策效应明显,而其他试点省市的政策效应则相对较弱。

关键词：碳排放权交易政策碳排放能源结构低碳转型双重差分模型绿色技术进步

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An Optimization Algorithm of Network Topology Discovery Based on SNMP Protocol

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Journal of Computer and Communications 2018年第1期6卷 104-111页

作者： xuliang zhang University of Science and Technology Liao Ning Anshan China

Through the analysis of network topology discovery algorithm used ICMP protocol and FDB address, a novel layer topology discovery and link layer topology discovery algorithm which is suitable for campus network environment is proposed based on SNMP protocol. This algorithm can rapidly and accurately calculate the second and third floors topology of the whole pipe network.

关键词： Simple Network Management Protocol Topology Discovery Network Management

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