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Designing silver niobate-based relaxor antiferroelectrics for ultrahigh energy storage performance

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Journal of Advanced Ceramics 2024年第8期13卷 1282-1290页

作者： Zhengdong Hu Zhen Liu bing Han Haonan Peng Kai Da Zequan Xu Zhengqian fu Zhigao Hu Genshui Wang Key Laboratory of Inorganic functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

AgNbO_(3)(AN)and modified AgNbO_(3) have been extensively investigated as promising lead-free antiferroelectric(AFE)energy storage *** studies have focused mainly on the use of an ion dopant at the A/B site to obtain a stabilized AFE phase;however,simultaneous improvements in the recoverable energy storage density(Wrec)and efficiency(n)are stll difficult to ***,we innovatively constructed a AgNbO_(3)-NaNbO_(3)-(Sr_(0.7)bi_(0.2.)TiO_(3)(AN-NN-SBT)ternary solid solution to achieve a relaxor AFE in AgNbO_(3)-based *** coexistence of antiferroelectric(M3)and paraelectric(O)phases in 0.8(0.7AgNbO_(3)-0.3NaNbO_(3))-0.2.Sro.7bio.2.TiO_(3) confirms the successful realization of a relaxor AFE,attributed to multiple ion occupation at the A/B ***,a high Wrec of 7.53 ***^(-3) and n of 74.0% are acquired,together with superior stability against various temperatures,frequencies,and cycling ***,a high power density(2.8.7 MW·cm^(-3))and fast discharge speed(41.4 ns)are also demonstrated for the AgNbO_(3)-based relaxor *** work presents a promising energy storage AgNbO_(3)-based ternary solid solution and proposes a novel strategy for AgNbO_(3)-based energy storage via the design of relaxor AFE materials.

关键词： AgNbO_(3)(AN)-based ceramics relaxor antiferroelectric(RAFE) paraelectric(PE) energy storage performance

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广西农业水价综合改革工作经验总结及建议

广西水利水电 2024年第4期 160-165页

作者：闭福刚广西壮族自治区水利科学研究院广西水工程材料与结构重点实验室南宁530023

介绍了广西农业水价综合改革进展情况,总结农业水价综合改革相关经验。分析了广西农业水价综合改革仍面临的形势与问题,从农业用水总量控制和定额管理机制、农业水价形成机制、精准补贴和节水奖励机制、农田水利工程良性管护机制等方面... 详细信息

介绍了广西农业水价综合改革进展情况,总结农业水价综合改革相关经验。分析了广西农业水价综合改革仍面临的形势与问题,从农业用水总量控制和定额管理机制、农业水价形成机制、精准补贴和节水奖励机制、农田水利工程良性管护机制等方面提出农业水价综合改革四项体制机制工作建议。

关键词：水价改革农业水价农业用水精准补贴管护机制

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儿童10例复杂呼吸道异物的诊治分析

临床耳鼻咽喉头颈外科杂志 2024年第2期38卷 155-159页

作者：严杨艳毕静刘佳陶孝芬付勇浙江大学医学院附属儿童医院耳鼻咽喉头颈外科杭州310005 浙江大学医学院附属儿童医院内镜中心

目的:探讨儿童复杂呼吸道异物的诊治经验。方法:回顾性分析1 2.3例儿童呼吸道异物的临床资料,其中10例(0.8%)复杂呼吸道异物。结果:10例复杂呼吸道异物患儿中,2.通过开胸手术取出;1例气管切开取出;1例予以肺叶切除取出;1例因伴有先天... 详细信息

目的:探讨儿童复杂呼吸道异物的诊治经验。方法:回顾性分析1 2.3例儿童呼吸道异物的临床资料,其中10例(0.8%)复杂呼吸道异物。结果:10例复杂呼吸道异物患儿中,2.通过开胸手术取出;1例气管切开取出;1例予以肺叶切除取出;1例因伴有先天性肺动脉吊带导致困难气道,予纤维支气管镜下取出后同步进行肺动脉吊带矫治术;3例通过纤维支气管镜下钬激光和(或)冷冻方法使异物变形、碎裂后通过声门取出;2.因异物特殊,硬支气管镜联合纤维支气管镜下取出。术后2.患儿因声门水肿明显,脱氧困难予插管送至ICU,2.因心脏或胸外科手术后,转至ICU病房,其余均在术后回普通病房。术后患儿均恢复良好。结论:呼吸道异物合并气道狭窄,异物种类、形状、嵌顿位置特殊,异物过大时,需合理选择异物取出的方法,必要时可采取多种方法联合使用,确保以最佳方案快速解除呼吸道梗阻。

关键词：儿童呼吸道异物支气管镜开胸

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海洋微生物膜层激光清洗表面轮廓有限元计算

中国科学：技术科学 2024年第1期54卷 165-178页

作者：冯俊华毕思源雷正龙付伟杰薛跃文哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨150001

本文以高强钢表面海洋微生物膜层为研究对象,开展了激光清洗试验与数值模拟研究.基于激光清洗常用的数值建模思想建立激光辐照模型,并改进了材料的去除过程从而建立了激光烧蚀模型,采用两种模型计算比较了功率2.0~800 W,频率10和2. kHz... 详细信息

本文以高强钢表面海洋微生物膜层为研究对象,开展了激光清洗试验与数值模拟研究.基于激光清洗常用的数值建模思想建立激光辐照模型,并改进了材料的去除过程从而建立了激光烧蚀模型,采用两种模型计算比较了功率2.0~800 W,频率10和2. kHz下激光清洗的温度场和清洗轮廓,并分析了不同光斑搭接率对清洗质量的影响.结果表明:功率为600 W时激光辐照模型计算的清洗宽度达906μm,明显超过了光斑直径900μm,而激光烧蚀模型仅有882.m且功率增大到800 W也没有超过光斑直径. 2.0 W功率下激光清洗实验测得的最高温度约为42..5 K,激光烧蚀模型计算值为432.K,而激光辐照模型计算值高达2.41 K. 2.0 W功率下激光清洗实验测得的清洗深度约为33.7μm,激光烧蚀模型计算值约为32.6μm,而激光辐照模型计算值高达63.9μm;因此结合试验和理论计算分析结果表明激光烧蚀模型相较激光辐照模型精确度更高.此外,采用激光烧蚀模型对5~10 kHz频率激光清洗表面进行模拟,结果显示:在采用经典高斯能量分布激光束进行激光清洗时,应保持光斑搭接率在50%以上,以保证清洗质量均匀一致.

关键词：海洋生物膜层处理激光清洗表面轮廓数值模拟

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BP神经网络的煤矿塌陷区水深反演

黑龙江科技大学学报 2024年第3期34卷 463-468页

作者：付俊毕京锐付翔安徽省核工业勘查技术总院安徽芜湖241000 安徽理工大学空间信息与测绘工程学院安徽淮南232001

为探测煤矿塌陷区的水深,利用Sentinel-2.感影像数据和无人船实测的水深数据,分析蓝波段、绿波段和红波段与水深实测值的相关性较高,确定其为反演因子,通过提取水深点的辐射亮度值并作归一化处理,建立单波段和多波段对数比值模型,以及B... 详细信息

为探测煤矿塌陷区的水深,利用Sentinel-2.感影像数据和无人船实测的水深数据,分析蓝波段、绿波段和红波段与水深实测值的相关性较高,确定其为反演因子,通过提取水深点的辐射亮度值并作归一化处理,建立单波段和多波段对数比值模型,以及BP神经网络模型反演矿区塌陷水域的水深。结果表明,BP神经网络模型的决定系数为0.895,均方根误差为0.42.,平均相对误差绝对值为8.12.,预测结果最好,精度最高,优于传统的线性模型。

关键词：塌陷水域 Sentinel-2 水深反演 BP神经网络

Interfacial Electronic Modulation of Dual-Monodispersed Pt–Ni_(3)S_(2. as Efficacious bi-functional Electrocatalysts for Concurrent H_(2. Evolution and Methanol Selective Oxidation

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Nano-Micro Letters 2024年第4期16卷 415-431页

作者： Qianqian Zhao bin Zhao Xin Long Renfei Feng Mohsen Shakouri Alisa Paterson Qunfeng Xiao Yu Zhang Xian‑Zhu fu Jing‑Li Luo Shenzhen Key Laboratory of Energy Electrocatalytic Materials Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Canadian Light Source Inc. SaskatoonSK S7N 0X4Canada Instrumental Analysis Center of Shenzhen University(Lihu Campus) Shenzhen UniversityShenzhen 518055People’s Republic of China

Constructing the efficacious and applicable bifunctional electrocatalysts and establishing out the mechanisms of organic electro-oxidation by replacing anodic oxygen evolution reaction(OER) are critical to the development of electrochemicallydriven technologies for efficient hydrogen production and avoid CO_(2. emission. Herein, the hetero-nanocrystals between monodispersed Pt(~ 2.nm) and Ni_(3)S_(2.(~ 9.6 nm) are constructed as active electrocatalysts through interfacial electronic modulation, which exhibit superior bi-functional activities for methanol selective oxidation and H_(2. generation. The experimental and theoretical studies reveal that the asymmetrical charge distribution at Pt–Ni_(3)S_(2. could be modulated by the electronic interaction at the interface of dual-monodispersed heterojunctions, which thus promote the adsorption/desorption of the chemical intermediates at the interface. As a result, the selective conversion from CH_(3)OH to formate is accomplished at very low potentials(1.45 V) to attain 100 m A cm^(-2. with high electronic utilization rate(~ 98%) and without CO_(2. emission. Meanwhile, the Pt–Ni_(3)S_(2. can simultaneously exhibit a broad potential window with outstanding stability and large current densities for hydrogen evolution reaction(HER) at the cathode. further, the excellent bi-functional performance is also indicated in the coupled methanol oxidation reaction(MOR)//HER reactor by only requiring a cell voltage of 1.60 V to achieve a current density of 50 m A cm^(-2. with good reusability.

关键词： Dual-monodispersed heterostructure Electronic interactive modulation Reaction mechanism Methanol oxidation reaction Hydrogen generation

Enhancing thermoelectric performance in P-type Mg_(3)Sb_(2.-based Zintls through optimization of band gap structure and nanostructuring

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Journal of Materials Science & Technology 2024年第3期170卷 25-32页

作者： Yi-bo Zhang Ji-Sheng Liang Chengyan Liu Qi Zhou Zhe Xu Hong-bo Chen fu-cong Li Ying Peng Lei Miao Guangxi Key Laboratory of Information Material Engineering Research Center of Electronic Information Materials and DevicesMinistry of EducationSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory for Relativity Astrophysics Center on Nanoenergy ResearchGuangxi Key Laboratory of Processing for Nonferrous Metal and Featured MaterialsSchool of Physical Science&TechnologyGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologySchool of Information and CommunicationGuilin 541004China

P-type Mg_(3)Sb_(2.-based Zintls have attracted considerable interest in the thermoelectric(TE)field due to their environmental friendliness and low ***,compared to their n-type counterparts,they show relatively low TE performance,limiting their application in TE *** this work,we simultaneously introduce bi alloying at Sb sites and Ag doping at Mg sites into the Mg_(3)Sb_(2.to coopera-tively optimize the electrical and thermal properties for the first time,acquiring the highest ZT value of∼0.85 at 72. K and a high average ZT of 0.39 in the temperature range of 32.-72. K in sample Mg_(2.94)Ag_(0.06)Sb_(1.9)bi_(0.1).The first-principle calculations show that the codoping of Ag and bi can shift the Fermi level into the valence band and narrow the band gap,resulting in the increased carrier concentration from 3.50×10^(17)cm^(-3)in the reference Mg 3 Sb 0.9 bi 0.1 to∼7.88×10^(19)cm^(-3)in sample Mg 2.94 Ag 0.06 Sb 0.9 bi *** a result,a remarkable power factor of∼778.9μW m^(-1)K^(-2.at 72. K is achieved in sample Mg 2.94 Ag 0.06 Sb 0.9 bi ***,a low lattice thermal conductivity of∼0.48 W m^(-1)K^(-1)at 72. K is also obtained with the help of phonon scattering at the distorted lattice,point defects,and nano-precipitates in sample Mg 2.94 Ag 0.06 Sb 0.9 bi *** synergistic effect of using the multi-element co-doping/-alloying to optimize electrical properties in Mg_(3)Sb_(2.holds promise for further improving the TE performance of Zintl phase materials or even others.

关键词： Thermoelectric materials Band engineering Nanostructuring P-type Mg_(3)Sb_(2. Ag and bi Co-doping

Enhancing thermoelectric performance of p-type SnTe through manipulating energy band structures and decreasing electronic thermal conductivity

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Rare Metals 2024年第7期43卷 3232-3241页

作者： Xin Qian Hao-Ran Guo Jia-Xin Lyu Bang-fu Ding Xing-Yuan San Xiao Zhang Jiang-Long Wang Shu-Fang Wang Hebei Key Lab of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China College of Electron and Information Engineering Hebei UniversityBaoding 071002China Research Institute for Frontier Science Beihang UniversityBeijing100191China

SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of ***,excessive hole carrier concentration in SnTe results in an extremely low Seebeck coefficient and high thermal conductivity,which makes it exhibit relatively inferior thermoelectric *** this work,the thermoelectric performance of p-type SnTe is enhanced through regulating its energy band structures and reducing its electronic thermal conductivity by combining bi doping with CdSe ***,the carrier concentration of SnTe is successfully suppressed via bi doping,which significantly decreases the electronic thermal ***,the convergence and flattening of the valence bands by alloying CdSe effectively improves the effective mass of SnTe while restraining its carrier ***,a maximum figure of merit(ZT) of~ 0.87 at 82. K and an average ZT of~ 0.51 at 300-82. K have been achieved in Sn_(0.96)bi_(0.04)Te-5%*** results indicate that decreasing the electronic thermal conductivity is an effective means of improving the performance of thermoelectric materials with a high carrier concentration.

关键词： Thermoelectric materials SnTe Energy band structure Electronic thermal conductivity ZT value

A Review on Engineering Transition Metal Compound Catalysts to Accelerate the Redox Kinetics of Sulfur Cathodes for Lithium–Sulfur Batteries

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Nano-Micro Letters 2024年第5期16卷 300-332页

作者： Liping Chen Guiqiang Cao Yong Li Guannan Zu Ruixian Duan Yang Bai Kaiyu Xue Yonghong fu Yunhua Xu Juan Wang Xifei Li Shaanxi Key Laboratory of Nanomaterials and Nanotechnology Xi’an University of Architecture and TechnologyXi’an 710055People’s Republic of China Institute of Advanced Electrochemical Energy and School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Yulin University Yulin 719000People’s Republic of China School of Materials Science and Engineering Fuzhou UniversityFuzhou 350108People’s Republic of China

Engineering transition metal compounds(TMCs)catalysts with excellent adsorption-catalytic ability has been one of the most effec-tive strategies to accelerate the redox kinetics of sulfur ***,this review focuses on engineering TMCs catalysts by cation doping/anion doping/dual doping,bimetallic/bi-anionic TMCs,and TMCs-based heterostructure *** is obvious that introducing cations/anions to TMCs or constructing heterostructure can boost adsorption-catalytic capacity by regulating the electronic structure including energy band,d/p-band center,electron filling,and valence ***,the elec-tronic structure of doped/dual-ionic TMCs are adjusted by inducing ions with different electronegativity,electron filling,and ion radius,resulting in electron redistribution,bonds reconstruction,induced vacancies due to the electronic interaction and changed crystal structure such as lat-tice spacing and lattice *** from the aforementioned two strategies,heterostructures are constructed by two types of TMCs with different Fermi energy levels,which causes built-in electric field and electrons transfer through the interface,and induces electron redistribution and arranged local atoms to regulate the electronic ***,the lacking studies of the three strategies to comprehensively regulate electronic structure for improving catalytic performance are pointed *** is believed that this review can guide the design of advanced TMCs catalysts for boosting redox of lithium sulfur batteries.

关键词： Lithium–sulfur battery Redox kinetic Transition metal compounds catalyst Multiple metals/anions