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Structure and defect dual-engineering of cobalt oxides for lowtemperature Zn-air batteries

Nano Research 2024年第5期17卷 4108-4117页

作者： Hang Lei Zhuowen Huangfu Liangjun Chen xuelin yang Zilong Wang Wenjie Mai Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering&New EnergyChina Three Gorges UniversityYichang 443002China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632China

The exploration of bifunctional electrocatalysts with high catalytic activity and long-term durability for low-temperature Zn-air batteries(ZABs)is an ongoing challenge.Here,quintet-shelled hollow spheres,P-doped multi-layer Co_(3)O_(4)(PM-Co_(3)O_(4)),with enriched oxygen vacancies are prepared by thermally induced mass relocation and a simple phosphating process.Various advanced characterizations reveal P anion-induced effects on internal electronic structure and local coordination environment.The finite element method elucidates that the complex multi-layer spherical nanostructure is conducive to the transport and diffusion of OH-and O_(2).Benefiting from its unique structural features and abundant oxygen vacancies,the well-designed PM-Co_(3)O_(4) presents small reversible oxygen overpotential for catalyzing oxygen reduction/evolution reactions.Accordingly,the fabricated low-temperature ZABs based on PM-Co_(3)O_(4) as air-cathode exhibit high power density(20.8 mW·cm^(-2))and long-term stability(over 600 cycles)at the ultra-low temperature of-40℃,outperforming state-of-art Pt/C+IrO_(2)-based ZABs.Furthermore,the dynamic evolution mechanism of cobalt oxide catalysts during ZAB operation is elucidated.This work provides a guideline to design efficient electrocatalysts with regulated electronic configurations and exquisite nano-/microstructures for ZABs under extreme working conditions.

关键词： Zn-air batteries electrocatalysts low temperature hollow spheres oxygen vacancies

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Dendrite-free and stable Zn metal anodes with ZnO protective layer

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Science China(Technological Sciences) 2022年第10期65卷 2361-2368页

作者： HOU ZhenHua TAO HuaChao WANG JiaXu ZHANG LuLu yang xuelin Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering&New EnergyChina Three Gorges UniversityYichang 443002China

Metallic Zn can be used as an anode for aqueous zinc-ion batteries due to its low redox potential,rich resources,and high theoretical capacity.However,its practical application is limited by dendrite growth and side reactions.Herein,a simple in-situ growth strategy was applied to fabricate a Zn anode with a ZnO protective layer(Zn/ZnO)to lengthen the cycle life and inhibit the dendrite growth and side reactions.At 1 mA h cm^(−2)capacity,Zn/ZnO exhibits long-time stability(2500 h)at 1 mA cm^(−2)and outstanding rate capability(1000 h at 10 mA cm^(−2))in symmetrical cells.Furthermore,the average coulombic efficiency of the Zn/ZnO//Ti cell is 99.4%,which is desirable at 5 mA cm^(−2).In addition,the Zn/ZnO//MnO_(2)cell can maintain a specific capacity of 167.2 mA h g^(−1)after 800 stable cycles.This work presents a simple fabrication method for Zn anode with excellent performance and suggests the huge possibilities of implementing practically rechargeable aqueous zinc-ion batteries.

关键词： aqueous zinc-ion batteries Zn anode ZnO protective layer dendrite-free

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新文科视域下高校日语核心素养提升路径与经验探索

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创新创业理论研究与实践 2024年第4期7卷 110-116页

作者：杨雪琳浙江工业大学之江学院浙江绍兴312030

在新文科大外语背景下,培养学生的日语核心素养是高校日语教育深化推进的重要抓手。该文在厘清高校日语核心素养内涵的基础上,立足“五位一体”分析框架,阐明了高校提升日语人才核心素养的实践路径,即构建一个以日语核心素养课程体系为... 详细信息

在新文科大外语背景下,培养学生的日语核心素养是高校日语教育深化推进的重要抓手。该文在厘清高校日语核心素养内涵的基础上,立足“五位一体”分析框架,阐明了高校提升日语人才核心素养的实践路径,即构建一个以日语核心素养课程体系为抓手,以革新教材为载体,以创新教学法为方式,以教学评价为推手,以教师能力为保障,以实践环境为支撑的完整日语人才培养体系;并以浙江省某高校为例,分析了其在应用型日语人才培养实践中提升学生日语核心素养的基本经验。

关键词：新文科核心素养高校日语 “五位一体” 应用型日语人才经验探索

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Progress in efficient doping of Al-rich AlGaN

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Journal of Semiconductors 2024年第2期45卷 10-20页

作者： Jiaming Wang Fujun Xu Lisheng Zhang Jing Lang Xuzhou Fang Ziyao Zhang Xueqi Guo Chen Ji Chengzhi Ji Fuyun Tan xuelin yang Xiangning Kang Zhixin Qin Ning Tang Xinqiang Wang Weikun Ge Bo Shen State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Beijing SinoGaN Semiconductor Technology Co. Ltd.Beijing 101399China Nano-optoelectronics Frontier Center of Ministry of Education Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China

The development of semiconductors is always accompanied by the progress in controllable doping techniques.Taking AlGaN-based ultraviolet(UV)emitters as an example,despite a peak wall-plug efficiency of 15.3%at the wavelength of 275 nm,there is still a huge gap in comparison with GaN-based visible light-emitting diodes(LEDs),mainly attributed to the inefficient doping of AlGaN with increase of the Al composition.First,p-doping of Al-rich AlGaN is a long-standing challenge and the low hole concentration seriously restricts the carrier injection efficiency.Although p-GaN cladding layers are widely adopted as a compromise,the high injection barrier of holes as well as the inevitable loss of light extraction cannot be neglected.While in terms of n-doping the main issue is the degradation of the electrical property when the Al composition exceeds 80%,resulting in a low electrical efficiency in sub-250 nm UV-LEDs.This review summarizes the recent advances and outlines the major challenges in the efficient doping of Al-rich AlGaN,meanwhile the corresponding approaches pursued to overcome the doping issues are discussed in detail.

关键词： AlGaN-based UV-LEDs Al-rich AlGaN doping

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手持激光雷达扫描仪飞马在地形测绘中的运用

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科技创新与应用 2024年第10期14卷 26-29页

作者：杨学林北京市市政工程设计研究总院有限公司北京100082

SLAM的全称为Simultaneous Localization And Mapping即“同时定位与地图构建”。最近几年由于机器人、无人机、自动驾驶、AI、VR和AR技术的发展,SLAM技术逐渐被人们熟知。SLAM技术是通过激光传感器感知周围的环境,并将不同时刻感知的... 详细信息

SLAM的全称为Simultaneous Localization And Mapping即“同时定位与地图构建”。最近几年由于机器人、无人机、自动驾驶、AI、VR和AR技术的发展,SLAM技术逐渐被人们熟知。SLAM技术是通过激光传感器感知周围的环境,并将不同时刻感知的环境进行匹配套合,从而反推本体在环境中的位置及运动轨迹。随着SLAM技术的设备及定位精度的提高,该技术逐渐在测绘行业中使用,迅速成为除RTK和全站仪采点成图之外的一种地形图成图手段。国外GeoSLAM等公司推出大量的产品,在该领域处于领先地位,为打破国外封锁,国内的飞马、数字绿土等公司也研发出相应的产品。该文主要通过具体的案例论述国产手持激光雷达扫描仪飞马SLAM 100在地形测绘中的运用,侧重于表述SLAM技术及SLAM100产品在运用中的优缺点。

关键词： SLAM技术手持激光雷达扫描地形测绘即时定位与地图构建三维激光技术

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基于图像处理的破片场三维测试方法

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兵器装备工程学报 2024年第4期45卷 263-267页

作者：张见升孙浩李超杨雪林胡云飞中国兵器工业试验测试研究院陕西华阴714200 南京理工大学机械工程学院南京210094

针对靶板法人工检靶效率低、人为误差大以及无法实现破片场三维测试的问题,利用摄影测量技术,提出灰度加权重心法计算破片穿孔位置坐标,采用基于单点标志的靶板轮廓识别和编码标志的大范围、位姿改变靶板三维拼接,二维坐标到三维空间坐... 详细信息

针对靶板法人工检靶效率低、人为误差大以及无法实现破片场三维测试的问题,利用摄影测量技术,提出灰度加权重心法计算破片穿孔位置坐标,采用基于单点标志的靶板轮廓识别和编码标志的大范围、位姿改变靶板三维拼接,二维坐标到三维空间坐标转换,实现了破片场的三维空间测量,通过设计试验,验证了方法的可靠性,结果表明:采用该方法破片尺寸大于3 mm识别率为100%,且准确获取了破片相对于爆心位置的三维坐标,实现了破片场三维测试,与人工检靶比较测试效率提高了10倍以上。此结论可为破片战斗部爆炸威力场的精确测试提供技术支撑,具有一定的工程应用价值。

关键词：图像处理破片场三维测试摄影测量重心法

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基于空间三维欧拉角估计的靶场外弹道数据处理方法研究

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兵器装备工程学报 2024年第4期45卷 75-81页

作者：杨雪林王西泉张旭斌张见升董斌王艳中国兵器工业试验测试研究院陕西华阴714200

针对雷达测试远程飞行试验获取的外弹道数据在转换至炮位发射坐标系过程中,事后数据处理结果落点距离偏差较大的问题,提出了一种基于空间三维欧拉角的弹道数据处理方法,该方法估计雷达发射坐标系旋转至炮位发射坐标系的空间三维欧拉角,... 详细信息

针对雷达测试远程飞行试验获取的外弹道数据在转换至炮位发射坐标系过程中,事后数据处理结果落点距离偏差较大的问题,提出了一种基于空间三维欧拉角的弹道数据处理方法,该方法估计雷达发射坐标系旋转至炮位发射坐标系的空间三维欧拉角,对雷达发射坐标系进行三轴方向的旋转,使其与炮位发射坐标系三轴指向在空间上方向一致,然后再进行坐标系平移,得到包含地球曲率因素的炮位发射坐标系数据处理结果。将该弹道数据处理方法得到的弹道落点,以及传统平移处理方法得到的弹道落点与真实落点的距离偏差分布情况进行对比分析,结果表明:基于空间三维欧拉角的数据处理落点偏差更小,落点数据精度更高,平均偏差缩小百分比达48.9%。本研究对于弹体的寻找、销毁与回收具有十分重要意义。

关键词：地球曲率欧拉角弹道数据处理坐标系旋转

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Accurate characterization of room-temperature long range magnetic order in GaN: Mn by magnetic force microscope

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Science China(Technological Sciences) 2011年第1期54卷 15-18页

作者： ZHANG YuHao LIN ZhiYuan CHEN ZhiTao QIAN YuZhou yang xuelin LI Ding ZHANG FaFa DAI Tao HAN BaoShan WANG CunDa ZHANG GuoYi State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of Physics Peking University Beijing 100871 China State Key Laboratory of Magnetism Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Room-temperature ferromagnetism with a Curie temperature higher than 380 K was studied in GaN: Mn thin films grown by metal-organic chemical vapor deposition. By etching artificial microstructures on the GaN: Mn layer,strong magnetic responses were observed in the magnetic force microscopy (MFM) measurement,which revealed that the films were independent of dopant particles and clusters. Numerical simulation on the data of atomic force microscope (AFM) and MFM measurements covering the whole microstructure validated the formation of long range magnetic order. This result excluded a variety of controversial origins of room-temperature ferromagnetism in the GaN: Mn and gave a strong evidence of our GaN: Mn as the intrinsic diluted magnetic semiconductor (DMS). The forwarded method for accurate characterization of long range magnetic order could be applied to a wide range of DMS and diluted magnetic oxide (DMO) systems.

关键词：磁力显微镜表征方法氮化镓长程磁有序室温金属有机化学气相沉积法锰原子力显微镜

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High-pressure MOCVD growth of InGaN thick films toward the photovoltaic applications

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Fundamental Research 2023年第3期3卷 403-408页

作者： Liwen Sang Meiyong Liao Masatomo Sumiya xuelin yang Bo Shen International Center for Materials Nanoarchitectonics(MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan JST-PRESTO The Japan Science and Technology AgencyTokyo 102-0076Japan Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukubaIbaraki 305-0044Japan State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijingChina

The highly efficient photovoltaic cells require the In-rich InGaN film with a thickness more than 300 nm to achieve the effective photo-electricity energy conversion.However,the InGaN thick films suffer from poor crystalline quality and phase separations by using the conventional low-pressure metal organic chemical vapor deposition(MOCVD).We report on the growth of 0.3-1μm-thick InGaN films with a specially designed vertical-type high-pressure MOCVD at the pressure up to 2.5 atms.The In incorporation is found to be greatly enhanced at the elevated pressures although the growth temperatures are the same.The phase separations are inhibited when the growth pressure is higher than atmospheric pressure,leading to the improved crystalline quality and better surface morphologies especially for the In-rich InGaN.The In 0.4 Ga 0.6 N with the thickness of 300 nm is further demonstrated as the active region of solar cells,and the widest photoresponse range from ultraviolet to more than 750 nm is achieved.

关键词： InGaN Solar cell High-pressure MOCVD Photo-electricity energy conversion In-rich XRD

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Metallic phase W_(0.9)Mo_(0.1)S_(2)for high-performance anode of sodium ion batteries through suppressing the dissolution of polysulfides

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Journal of Energy Chemistry 2022年第3期31卷 356-365,I0010页

作者： Huachao Tao Jing Li Jinhang Li Zhenhua Hou xuelin yang Li-Zhen Fan College of Electrical Engineering&New Energy Hubei Provincial Collaborative Innovation Center for New Energy MicrogridChina Three Gorges UniversityYichang 443002HubeiChina Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

WS_(2)with layered graphite-like structure as anode for sodium ion batteries has high specific capacity.However,the poor cycling performance and rate capability of WS_(2)caused by the low electronic conductivity and structure changes during cycles inhibit its practical application.Herein,metallic phase(1T)W_(x)Mo_(1−x)S2(x=1,0.9,0.8 and 0.6)with high electronic conductivity and expanded interlayer spacing of 0.95 nm was directly prepared via a simple hydrothermal method.Specially,1T W_(0.9)Mo_(0.1)S_(2)as anode for sodium ion batteries displays high capacities of 411 mAh g^(-1)at 0.1 A g^(-1)after 180 cycles and 262 mAh g^(-1)at 1 A g^(-1)after 280 cycles and excellent rate capability(245 mAh g^(-1)at 5 A g^(-1)).The full cell based on Na_(3)V_(2)(PO_(4))_(2)O_(2)F/C cathode and 1T W_(0.9)Mo_(0.1)S_(2)anode also exhibits high capacity and good cycling performance.The irreversible electrochemical reaction of 1T W_(0.9)Mo_(0.1)S_(2)with Na ions during first few cycles results in the main products of W-Mo alloy and S.The strong adsorption of W-Mo alloy with polysulfides can effectively suppress the dissolution and shuttle effect of polysulfides,which ensures the excellent cycling performance of 1T W_(0.9)Mo_(0.1)S_(2).

关键词： Sodium ion batteries Anode 1T W_(0.9)Mo_(0.1)S_(2) Irreversible conversion reaction Polysulfides

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