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Oxygen‑Defect Enhanced Anion Adsorption Energy Toward Super‑Rate and Durable Cathode for Ni–Zn Batteries

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Nano-Micro Letters 2021年第11期13卷 128-141页

作者： Jia Yao Houzhao Wan Chi Chen Jie Ji Nengze Wang Zhaohan Zheng Jinxia Duan Xunying Wang guokun ma Li Tao Hanbin Wang Jun Zhang Hao Wang Hubei Key Laboratory of Ferro and Piezoelectric materials and Devices School of Microelectronics and Faculty of Physics and Electronic ScienceHubei UniversityWuhan 430062People’s Republic of China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002People’s Republic of China Xiamen Key Laboratory of Rare Earth Photoelectric Functional materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021People’s Republic of China

The alkaline zinc-based batteries with high energy density are becoming a research ***,the poor cycle stability and low-rate performance limit their wide ***,ultra-thin CoNiO2 nanosheet with rich oxygen defects anchored on the vertically arranged Ni nanotube arrays(Od-CNO@Ni NTs)is used as a positive material for rechargeable alkaline Ni–Zn *** the highly uniform Ni nanotube arrays provide a fast electron/ion transport path and abundant active sites,the Od-CNO@Ni NTs electrode delivers excellent capacity(432.7 mah g^(−1))and rate capability(218.3 mah g^(−1) at 60 A g^(−1)).Moreover,our Od-CNO@Ni NTs//Zn battery is capable of an ultra-long lifespan(93.0%of initial capacity after 5000 cycles),extremely high energy density of 547.5 Wh kg^(−1) and power density of 92.9 kW kg^(−1)(based on the mass of cathode active substance).Meanwhile,the theoretical calculations reveal that the oxygen defects can enhance the interaction between electrode surface and electrolyte ions,contributing to higher *** work opens a reasonable idea for the development of ultra-durable,ultra-fast,and high-energy Ni–Zn battery.

关键词： Ni-Zn battery Oxygen defect Nanotube array CoNiO2 nanosheet Adsorption energy

Promoting Proton Migration Kinetics by Ni^(2+)Regulating Enables Improved Aqueous Zn-MnO_(2) Batteries

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Energy & Environmental materials 2023年第2期6卷 252-261页

作者： Jie Ji Jia Yao Yongchang Xu Houzhao Wan Bao Zhang Lin Lv Jingying Li Nengze Wang Zhaohan Zheng Jun Zhang guokun ma Li Tao Hanbin Wang Yi Wang Hao Wang Hubei Yangtze Memory Laboratories Wuhan 430205China School of MicroelectronicsHubei UniversityWuhan 430062China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Center for Microscopy and Analysis Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The energy storage behaviors of MnO_(2) for aqueous Zn-MnO_(2) batteries mainly depend on the Zn^(2+)/H^(+)intercalation but are limited by poor ion/electron migration dynamics and ***,a strategy is proposed that promoting proton migration kinetics ameliorates H^(+)storage activity by introducing Ni^(2+)intoγ-MnO_(2)(Ni-MnO_(2)).Ni^(2+)can lower the diffusion barrier of H^(+)and selectively induce the ion intercalation,thereby alleviating the electrostatic interaction with the ***,Ni^(2+)enables the adjacent[MnO6]octahedrons to have better electron *** Ni-MnO_(2) exhibits superior rate performance(nearly four times specific capacity compared with MnO_(2))and ultra-long-cycle stability(100%of capacity retention after 11000 cycles at 3.0 A g^(-1)).The calculation indicates that the Ni-MnO_(2) allows H^(+)migrate rapidly along the one-dimensional tunnel due to reduction of the activation energy caused by Ni^(2+)regulating,thus achieving excellent reaction *** work brings great potential for the development of high-performance aqueous Zn-MnO_(2) batteries.

关键词： doping H^(+)storage ion/electron transport proton migration Zinc ion battery

Ultrasensitive,flexible perovskite nanowire photodetectors with long-term stability exceeding 5000 h

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Infomat 2022年第9期4卷 85-96页

作者： Dingjun Wu Yongchang Xu Hai Zhou Xin Feng Jianqiang Zhang Xiyan Pan Zheng Gao Rui Wang guokun ma Li Tao Hanbin Wang Jinxia Duan Houzhao Wan Jun Zhang Liangping Shen Hao Wang Tianyou Zhai School of Microelectronics Hubei UniversityWuhanChina Yangtze Memory Laboratories WuhanChina International School of Microelectronics Dongguan University of TechnologyDongguanChina School of materials Science and Engineering Huazhong University of Science and Technology(HUST)WuhanChina

Photodetectors(PDs)based on perovskite nanowires are among the most promising next-generation photodetection technologies;however,their poor long-term stability is the biggest challenge limiting their commercial ***,an ionic liquid,1-butyl-3 methylimidazolium tetrafuoroborate(BMIMBF_(4)),is incorporated as an additive into methylammonium lead tri-iodide(maPbI_(3))nanowires;this not only effectively passivates defects to inhibit perovskite degradation but also leads to the formation of nanochannels,enabling fast charge *** a result,the long-term stability and perfor-mance of maPbI_(3)nanowires are considerably *** detectivity,linear detection range,and noise equivalent power of the ma PbI_(3)nanowire PD reach 2.06×10^(13)Jones,160dB,and 1.38×10^(-15)W Hz-^(1/2),respectively,compara-ble to the highest performance of perovskite nanowire PDs reported to ***,the unencapsulated PD can maintain 100%of its initial performance after being exposed to an open-air environment for more than 5000 h,esta-blishing it as the most stable perovskite nanowire PD reported to ***-bly,the PD exhibits improved diffuse reflection imaging ability when compared with commercial silicon photodiode *** study provides a new strategy for constructing sensitive,stable,and flexible perovskite PDs and will accelerate their commercial application in the future.

关键词： diffuse rflction imaging flexible ionic liquids long-term stability perovskite nanowire photodetectors

氧化锆基阻变存储器中金掺杂效应的第一性原理研究

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中国科学：技术科学 2018年第5期48卷 575-582页

作者：韦晓迪魏巍马国坤叶葱周昊何品沈谅平黄忠兵湖北大学物理与电子科学学院湖北省铁电压电材料与器件重点实验室武汉430062 中国科学院微电子器件与集成技术重点实验室北京100029

氧空位在过渡金属氧化物阻变存储器的电阻转变中有重要作用.采用第一性原理计算方法,研究Au掺杂前后阻变层材料ZrO_2的能带结构、态密度、氧空位的形成能和迁移势垒能来分析氧化锆基阻变存储器中的Au掺杂效应.研究发现,Au掺杂后ZrO_2费... 详细信息

氧空位在过渡金属氧化物阻变存储器的电阻转变中有重要作用.采用第一性原理计算方法,研究Au掺杂前后阻变层材料ZrO_2的能带结构、态密度、氧空位的形成能和迁移势垒能来分析氧化锆基阻变存储器中的Au掺杂效应.研究发现,Au掺杂后ZrO_2费米能级处出现了局域化杂质带且禁带宽度减小,由此提升了ZrO_2的导电能力;Au掺杂后氧空位形成能及迁移势垒能显著降低,从而有利于氧空位的形成和迁移,进而降低ZrO_2基阻变存储器的形成(forming)电压与置位(set)电压.我们利用电子局域函数模拟ZrO_2超晶胞[001]方向包含掺杂元素Au的氧空位列,结果表明局域在杂质周围的氧空位在[001]方向形成有序导电通道.

关键词： ZrO2 第一性原理氧空位掺杂效应阻变存储器

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基于阈值电压的忆阻器模型研究

信息通信 2018年第9期31卷 26-29页

作者：臧新风沈谅平王浩马国坤叶葱湖北大学物理与电子科学学院湖北武汉430062

为了使忆阻器模型更加接近实际器件,提高其电学特性仿真的准确性。文章在惠普实验室提出的忆阻器物理模型的基础上,在matlab中对忆阻器进行建模,并对忆阻器的模型根据实际器件具有的电压阈值特性进行了改进,仿真结果表明基于改进电压阈... 详细信息

为了使忆阻器模型更加接近实际器件,提高其电学特性仿真的准确性。文章在惠普实验室提出的忆阻器物理模型的基础上,在matlab中对忆阻器进行建模,并对忆阻器的模型根据实际器件具有的电压阈值特性进行了改进,仿真结果表明基于改进电压阈值的模型所呈现的电学特性更加准确地反映了忆阻器的输入输出特性。

关键词：忆阻器 matlab 阈值模型

A Nonlinear Representation of Model Uncertainty in a Convective-Scale Ensemble Prediction System

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Advances in Atmospheric Sciences 2022年第9期39卷 1432-1450页

作者： Zhizhen XU Jing CHEN Mu MU guokun DAI Yanan ma Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Numerical Weather Prediction Center China Meteorological AdministrationBeijing 100081China Chinese Academy of Meteorological Sciences China Meteorological AdministrationBeijing 100081China

How to accurately address model uncertainties with consideration of the rapid nonlinear error growth characteristics in a convection-allowing system is a crucial issue for performing convection-scale ensemble *** this study,a new nonlinear model perturbation technique for convective-scale ensemble forecasts is developed to consider a nonlinear representation of model errors in the Global and Regional Assimilation and Prediction Enhanced System(GRAPES)Convection-Allowing Ensemble Prediction System(CAEPS).The nonlinear forcing singular vector(NFSV)approach,that is,conditional nonlinear optimal perturbation-forcing(CNOP-F),is applied in this study,to construct a nonlinear model perturbation method for *** experiments are performed:One of them is the CTL experiment,without adding any model perturbation;the other two are NFSV-perturbed experiments,which are perturbed by NFSV with two different groups of constraint radii to test the sensitivity of the perturbation magnitude *** results show that the NFSV-perturbed experiments achieve an overall improvement and produce more skillful forecasts compared to the CTL experiment,which indicates that the nonlinear NFSV-perturbed method can be used as an effective model perturbation method for convection-scale ensemble ***,the NFSV-L experiment with large perturbation constraints generally performs better than the NFSV-S experiment with small perturbation constraints in the verification for upper-air and surface weather *** for precipitation verification,the NFSV-S experiment performs better in forecasts for light precipitation,and the NFSV-L experiment performs better in forecasts for heavier precipitation,indicating that for different precipitation events,the perturbation magnitude constraint must be carefully *** the findings above lay a foundation for the design of nonlinear model perturbation methods for future CAEPSs.

关键词： Convection-Allowing Ensemble Prediction System model uncertainty nonlinear forcing singular vector

NH_(4)^(+)插层Mo掺杂MnO_(2)阴极实现强键合作用助力超稳定水系锌锰电池

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中国科学:材料科学(英文版) 2023年第8期66卷 3113-3122页

作者：郑俊杰石培陈驰陈鑫甘億李敬迎姚佳杨银吕琳马国坤桃李汪汉斌张军沈谅平万厚钊王浩 Hubei Yangtze Memory Laboratories Wuhan 430205China School of Microelectronics Hubei UniversityWuhan 430062China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Institute of Rare Earth materials Haixi InstituteChinese Academy of SciencesXiamen 361021China

水系可充电锌/二氧化锰电池因其成本低廉、能量密度高而引起了广泛关注.然而,缓慢的反应动力学和MnO_(2)阴极的歧化反应以及不可逆的相变现象对其发展造成了严重阻碍.在此,我们选用了Mo掺杂α-MnO_(2)(Mo–MnO_(2))作为阴极材料,通过铵... 详细信息

水系可充电锌/二氧化锰电池因其成本低廉、能量密度高而引起了广泛关注.然而,缓慢的反应动力学和MnO_(2)阴极的歧化反应以及不可逆的相变现象对其发展造成了严重阻碍.在此,我们选用了Mo掺杂α-MnO_(2)(Mo–MnO_(2))作为阴极材料,通过铵根离子插层机制所形成的N–H···O强键合作用来稳定Mo–MnO_(2)的2×2隧道结构,并且有效抑制了Mn^(3+)溶解,在质子插入/脱出过程中不会引起晶格的畸变,进一步提高了其循环稳定性.获得的Mo–MnO_(2)正极在100 ma g^(−1)时表现出265.2 ma h g^(−1)的高比容量和364.3 W h kg^(−1)的能量密度.在2.0 A g^(−1)下1000次循环后,容量保持率达95.2%.这项工作有助于深入了解非金属阳离子在电极主体材料间的键合作用,为设计具有高能量密度和长期循环能力的水系锌离子电池提供了新思路.

关键词：锌锰电池锌离子电池阴极材料能量密度 Mo掺杂键合作用主体材料超稳定

The Influence of Arctic Sea Ice Concentration Perturbations on Subseasonal Predictions of North Atlantic Oscillation Events

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Advances in Atmospheric Sciences 2023年第12期40卷 2242-2261,I0009-I0015页

作者： guokun DAI Mu MU Zhe HAN Chunxiang LI Zhina JIANG Mengbin ZHU Xueying ma Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Cma-FDU Joint Laboratory of marine Meteorology Shanghai 200438China Shanghai Frontiers Science Center of Atmosphere-Ocean Interaction Shanghai 200438China Innovation Center of Ocean and Atmosphere System Zhuhai Fudan Innovation Research InstituteZhuhai 509031China CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Severe Weather(LaSW) Chinese Academy of Meteorological SciencesBeijing 100081China Beijing Institute of Applied Meteorology Beijing 100029China Yantai Vocational College Yantai 264670China

The influence of Arctic sea ice concentration (SIC) on the subseasonal prediction of the North Atlantic Oscillation (NAO) event is investigated by utilizing the Community Atmospheric Model version 4. The optimal Arctic SIC perturbations which exert the greatest influence on the onset of an NAO event from a lead of three pentads (15 days) are obtained with a conditional nonlinear optimal perturbation approach. Numerical results show that there are two types of optimal Arctic SIC perturbations for each NAO event, with one weakening event (marked as type-1) and another strengthening event (marked as type-2). For positive NAO events, type-1 optimal SIC perturbations mainly show positive SIC anomalies in the Greenland, Barents, and Okhotsk Seas, while type-2 perturbations mainly feature negative SIC anomalies in these regions. For negative NAO events, the optimal SIC perturbations have almost opposite patterns to those in positive events, although there are some differences among these SIC perturbations due to different atmospheric initial conditions. Further diagnosis reveals that the optimal Arctic SIC perturbations first modify the surface turbulent heat flux and the temperature in the lower troposphere via diabatic processes. Afterward, the temperature in the low troposphere is mainly affected by dynamic advection. Finally, potential vorticity advection plays a crucial role in the 500-hPa geopotential height prediction in the northern North Atlantic sector during pentad 4, which influences NAO event prediction. These results highlight the importance of Arctic SIC on NAO event prediction and the spatial characteristics of the SIC perturbations may provide scientific support for target observations of SIC in improving NAO subseasonal predictions.

关键词： optimal Arctic SIC perturbation NAO event subseasonal prediction CNOP approach

Influence of Arctic Sea-ice Concentration on Extended-range Forecasting of Cold Events in East Asia

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Advances in Atmospheric Sciences 2023年第12期40卷 2224-2241页

作者： Chunxiang LI guokun DAI Mu MU Zhe HAN Xueying ma Zhina JIANG Jiayu ZHENG Mengbin ZHU CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200433China Innovation Center of Ocean and Atmosphere System Zhuhai Fudan Innovation Research InstituteZhuhai 518057China Cma-FDU Joint Laboratory of marine Meteorology Shanghai 200438China Yantai Vocational College Yantai 264043China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Beijing Institute of Applied Meteorology Beijing 100029China

Utilizing the Community Atmosphere Model,version 4,the influence of Arctic sea-ice concentration(SIC)on the extended-range prediction of three simulated cold events(CEs)in East Asia is *** results show that the Arctic SIC is crucial for the extended-range prediction of CEs in East *** conditional nonlinear optimal perturbation approach is adopted to identify the optimal Arctic SIC perturbations with the largest influence on CE prediction on the extended-range time *** shows that the optimal SIC perturbations are more inclined to weaken the CEs and cause large prediction errors in the fourth pentad,as compared with random SIC perturbations under the same *** diagnosis reveals that the optimal SIC perturbations first modulate the local temperature through the diabatic process,and then influence the remote temperature by horizontal advection and vertical convection ***,the optimal SIC perturbations trigger a warming center in East Asia through the propagation of Rossby wave trains,leading to the largest prediction uncertainty of the CEs in the fourth *** results may provide scientific support for targeted observation of Arctic SIC to improve the extended-range CE prediction skill.

关键词： cold event Arctic sea-ice concentration extended-range prediction