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Recent Advances in Atomic-scale Storage Mechanism Studies of Two-dimensional Nanomaterials for Rechargeable Batteries Beyond Li-ion

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Chemical Research in Chinese Universities 2020年第4期36卷 560-583页

作者： PAN Lu DONG Jinyang YI Ding yang yijun WANG Xi Department of Physics School of ScienceBeijing Jiaotong UniversityBeijing 100044P.R.China Chemistry ami Chemical Engineering Guangdong Laboratory Shantou 515031P.R.China Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081P.R.China

Developing new types of rechargeable batteries with high energy densities and low cost have received in creasing attentions,aiming to reduce the dependence on high-priced lithium.Bevond Li-ion batteries,the potential alternatives including Na-ion batteries,Li-S batteries and Li-air batteries have been investigated recently,which are required to be viable for commercial applications.From this point of view,to understand the electrochemical reaction mechanisms and kinetics of these batteries has become the key challenge to make breakthroughs in the field of new energy storage.In this review,we present a critical overview of the two dimensional nanomaterials-based batteries(except Li-ion-based batteries)that could meet such demonds.To develop new energy storage devices with more promising performances,the microstructure evolution and atomic scale storage mechanism of these batteries are comprehensively summarized.In addition,the major challenges and opportunities of advanced characterization techniques are finally discussed.We do hope that this review will give the readers a clear and profound understanding of the electrochemical reaction mechanisms and kinetics of the as-discussed batteries.thus effectively contributing to the smart design of future-generation energy storage devices.

关键词： Two dimensional(2D)nanomaterial Batteries beyond Li ion In sinu technique Atomic-level Storage mechanism and kinetics

ZnO/Gd_(2)O_(3)复合中空微球的制备及其电磁性能研究

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中国稀土学报 2024年第1期42卷 70-79,I0003页

作者：王晶琳聂志颖杨怡均乔儒童国秀浙江师范大学化学与生命科学学院先进催化材料教育部重点实验室浙江金华321004

以水热法一步合成的C/ZnO微球为基材,通过煅烧处理得到ZnO中空多孔微球,随后利用尿素均相沉积方法及煅烧处理成功制备了ZnO/Gd_(2)O_(3)复合吸波材料。通过对样品的形貌、组成、磁性能与电磁特性的表征,讨论了调控尿素的加入量对产物吸... 详细信息

以水热法一步合成的C/ZnO微球为基材,通过煅烧处理得到ZnO中空多孔微球,随后利用尿素均相沉积方法及煅烧处理成功制备了ZnO/Gd_(2)O_(3)复合吸波材料。通过对样品的形貌、组成、磁性能与电磁特性的表征,讨论了调控尿素的加入量对产物吸波性能的影响,同时,探讨了该复合体系的吸波机理。结果显示,将磁性Gd_(2)O_(3)与介电损耗型ZnO相结合设计异质结构,磁损耗的引入能改善阻抗匹配特性。由于双重损耗机制、异质结构和中空多孔结构的协同作用,ZnO/Gd_(2)O_(3)展示了高效的电磁波吸收能力。磁导率和匹配特性随着Gd_(2)O_(3)含量的增加而增大,而高介电常数和衰减特性随着Gd_(2)O_(3)含量的增加而减小。当尿素的加入量为0.5 g时,所得ZnO/Gd_(2)O_(3)-2展示出优良的宽带、高吸收特性,当匹配厚度为3.5 mm时,对应有效吸收带宽为7.08 GHz,其最大吸收为-40.76 dB。

关键词： ZnO/Gd_(2)O_(3) 中空多孔结构吸波性能吸波机制

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大牛地气田老井水锁伤害及解除技术研究

石油工业技术监督 2024年第5期40卷 53-59页

作者：王锦昌杨易骏中国石化华北油气分公司石油工程技术研究院河南郑州450006

大牛地气田开发后期部分老井存在井底积液及近井地带水锁伤害,造成单井产量大幅降低,严重影响气田高效开发。通过建立老井储层水锁评价模型,明确了老井在不同条件下水锁伤害程度;同时以低表面张力、中性润湿为目标,优选出高效XH207C型... 详细信息

大牛地气田开发后期部分老井存在井底积液及近井地带水锁伤害,造成单井产量大幅降低,严重影响气田高效开发。通过建立老井储层水锁评价模型,明确了老井在不同条件下水锁伤害程度;同时以低表面张力、中性润湿为目标,优选出高效XH207C型解水剂,其与泡排剂、阻垢剂、缓蚀剂等现用药剂配伍性良好,且使盒1、山2层岩心平均渗透率恢复率达130.5%,具有优异解水锁性能。现场应用表明,3口老井解水锁试验后日均增产4 377 m^(3)、累计增产363 226 m^(3),增产有效期为70~103 d,具有良好的增产效果。因此,该水锁解除技术在大牛地气田开发生产中具有一定应用前景。

关键词：老井水锁伤害解水锁剂优选评价解水锁技术

Engineering Spin States of Isolated Copper Species in a Metal-Organic Framework Improves Urea Electrosynthesis

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Nano-Micro Letters 2023年第9期15卷 536-549页

作者： Yuhang Gao Jingnan Wang yijun yang Jian Wang Chuang Zhang Xi Wang Jiannian Yao Key Laboratory of Photochemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering Tianjin UniversityTianjin 300072People’s Republic of China Department of Physics School of Physical Science and EngineeringBeijing Jiaotong UniversityBeijing 100044People’s Republic of China Research Center for Magnetic and Spintronic Materials National Institute for Materials Science Tsukuba 305-0047Japan

The catalytic activities are generally believed to be relevant to the electronic states of their active center, but understanding this relationship is usually difficult. Here, we design two types of catalysts for electrocatalytic urea via a coordination strategy in a metal–organic frameworks: Cu^(Ⅲ)-HHTP and Cu^(Ⅱ)-HHTP. Cu^(Ⅲ)-HHTP exhibits an improved urea production rate of 7.78 mmol h^(−1)g^(−1) and an enhanced Faradaic efficiency of 23.09% at-0.6 V vs. reversible hydrogen electrode, in sharp contrast to Cu^(Ⅱ)-HHTP.Isolated CuⅢspecies with S = 0 spin ground state are demonstrated as the active center in Cu^(Ⅲ)-HHTP, different from Cu^(Ⅱ) with S = 1/2 in Cu^(Ⅱ)-HHTP. We further demonstrate that isolated Cu^(Ⅲ)with an empty dx2-y20orbital in Cu^(Ⅲ)-HHTP experiences a single-electron migration path with a lower energy barrier in the C–N coupling process, while Cu^(Ⅱ)with a single-spin state( d_(x2-y2)^(1)) in Cu^(Ⅱ)-HHTP undergoes a two-electron migration pathway.

关键词： Electrocatalysis Urea synthesis Metal-organic framework Spin catalysis C-N coupling

Toward Quantifying the Increasing Accessibility of the Arctic Northeast Passage in the Past Four Decades

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Advances in Atmospheric Sciences 2023年第12期40卷 2378-2390,I0016-I0018页

作者： Chao MIN Xiangying ZHOU Hao LUO yijun yang Yiguo WANG Jinlun ZHANG Qinghua yang School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai 200438China Nansen Environmental and Remote Sensing Center and Bjerknes Centre for Climate Research 2007 BergenNorway Polar Science Center Applied Physics LabUniversity of WashingtonSeattleWA 98105USA

Sea ice,one of the most dominant barriers to Arctic shipping,has decreased dramatically over the past four decades.Arctic maritime transport is hereupon growing in recent years.To produce a long-term assessment of trans-Arctic accessibility,we systematically revisit the daily Arctic navigability with a view to the combined effects of sea ice thickness and concentration throughout the period 1979−2020.The general trends of Navigable Windows(NW)in the Northeast Passage show that the number of navigable days is steadily growing and reached 89±16 days for Open Water(OW)ships and 163±19 days for Polar Class 6(PC6)ships in the 2010s,despite high interannual and interdecadal variability in the NWs.More consecutive NWs have emerged annually for both OW ships and PC6 ships since 2005 because of the faster sea ice retreat.Since the 1980s,the number of simulated Arctic routes has continuously increased,and optimal navigability exists in these years of record-low sea ice extent(e.g.,2012 and 2020).Summertime navigability in the East Siberian and Laptev Seas,on the other hand,varies dramatically due to changing sea ice conditions.This systematic assessment of Arctic navigability provides a reference for better projecting the future trans-Arctic shipping routes.

关键词： Arctic sea ice Arctic shipping climate change human-environment

玉米苞叶组织细胞结构生物质碳的制备及显微结构的研究

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电子显微学报 2024年第3期43卷 339-345页

作者：周晓亮马林杨一君余宇张致远罗马曾祥昇严铮洸北京交通大学物理科学与工程学院北京100044 北京工业大学材料学部北京100124

采用一步热解法,使用常见的玉米果穗苞叶为原料,制备了保留玉米苞叶组织细胞结构的生物质碳膜,采用扫描电镜,透射电镜等技术手段对样品的形貌和结构进行了表征,样品表面有明显的维管束以及大量的气孔的存在。不添加任何导电剂和添加剂,... 详细信息

采用一步热解法,使用常见的玉米果穗苞叶为原料,制备了保留玉米苞叶组织细胞结构的生物质碳膜,采用扫描电镜,透射电镜等技术手段对样品的形貌和结构进行了表征,样品表面有明显的维管束以及大量的气孔的存在。不添加任何导电剂和添加剂,热解碳膜直接作为工作电极使用,在100 mA·g^(-1)的电流密度下,200次循环后仍能获得218 mAh·g^(-1)的可逆比容量。本工作在生物质废弃物利用,以及储能材料开发等方面有参考价值。

关键词：生物质细胞结构电子显微学储能

城区复杂环境下深基坑开挖对邻近地铁影响分析

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城市勘测 2024年第3期 195-200页

作者：羊逸君陈俊辉王颖赖小勇杭州市地铁集团有限责任公司浙江杭州310018 杭州市勘测设计研究院有限公司浙江杭州310012

以杭州市区某邻近地铁的深基坑项目为例,探讨了复杂环境条件下基坑变形控制设计方法。该项目的难点在于如何将地铁保护区内基坑分区开挖与渠道改道结合起来,渠道基坑施工时预先应用了水平向及竖向MJS加固体(局部内插H型钢),主基坑采用了... 详细信息

以杭州市区某邻近地铁的深基坑项目为例,探讨了复杂环境条件下基坑变形控制设计方法。该项目的难点在于如何将地铁保护区内基坑分区开挖与渠道改道结合起来,渠道基坑施工时预先应用了水平向及竖向MJS加固体(局部内插H型钢),主基坑采用了MJS和咬合桩做地连墙槽壁加固等措施,实测数据表明该项目的实施最终有效控制了基坑本体变形和地铁位移,可供相关项目设计参考。

关键词：深基坑复杂环境变形控制地铁设施监测

Evaluation and Forecast Method of AC Contactor Contacts Dynamic Response Based on Theory of Chaos

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Evaluation and Forecast Method of AC Contactor Contacts Dyna...

旁侧深大基坑开挖对邻近地铁隧道变形影响研究

The 26th International Conference on Electrical contacts and the 4th International Conference on Reliability of Electrical Products & Electrical Contacts

作者： yang yijun Su Xiuping Cui Chunyan Electrical Engineering Dept.Hebei University of Technology Information & Electrical Engineering Dept.Hebei University of Engineering

With operating numbers of AC contactors,some tiny variations in mechanical performance and structural parameters would result in electrical performance change,and would extremely influence contacto

ISBN: (纸本)9781622763136

With operating numbers of AC contactors,some tiny variations in mechanical performance and structural parameters would result in electrical performance change,and would extremely influence contacto

关键词： Chaos AC contactor The largest LE Forecast Dynamic response chaos contactors FAILURE ANALYSIS ALTERNATING CURRENT Mechanical properties theories

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低温建筑技术 2024年第1期46卷 141-144页

作者：姜叶翔羊逸君周波陶庆军徐鹏丁智杭州市地铁集团有限责任公司杭州310003 杭州地铁运营有限公司杭州310003 上海勘察设计研究院(集团)有限公司上海200438 浙大城市学院杭州310015

为探究深基坑开挖对邻近地铁隧道的影响,文中以杭州某邻近地铁隧道的深基坑工程为背景,建立坑底在隧道正侧方的三维模型,分析基坑开挖过程中邻近隧道的变形规律,并结合研究结果提出相应的监测方法。结果表明基坑开挖时要重视隧道顶部的... 详细信息

为探究深基坑开挖对邻近地铁隧道的影响,文中以杭州某邻近地铁隧道的深基坑工程为背景,建立坑底在隧道正侧方的三维模型,分析基坑开挖过程中邻近隧道的变形规律,并结合研究结果提出相应的监测方法。结果表明基坑开挖时要重视隧道顶部的裂缝监测;隧道变形以隆起为主,并产生远离基坑的水平位移及扭转;基坑与隧道水平距离超过25m后基坑开挖对隧道基本没有影响;基坑底板的施工能有效控制隧道变形,研究结果可为类似工程施工提供参考。

关键词：深大基坑地铁隧道隧道变形