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Coupling Sb_(2)WO_(6)microflowers and conductive polypyrrole for efficient potassium storage by enhanced conductivity and K^(+) diffusivity

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Journal of Energy Chemistry 2024年第2期89卷 250-258,I0007页

作者： Ruiqi Tian hehe zhang Zeyu Yuan Yuehua Man Jianlu Sun Jianchun Bao Ming-Sheng Wang Xiaosi Zhou School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023JiangsuChina State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005FujianChina

Although metal oxide compounds are considered as desirable anode materials for potassium-ion batteries(PIBs)due to their high theoretical capacity,the large volume variation remains a key issue in realizing metal oxide anodes with long cycle life and excellent rate *** this study,polypyrroleencapsulated Sb_(2)WO_(6)(denoted Sb_(2)WO_(6)@PPy)microflowers are synthesized by a one-step hydrothermal method followed by in-situ polymerization and coating by *** the nanosheet-stacked Sb_(2)WO_(6)microflower structure,the improved electronic conductivity,and the architectural protection offered by the PPy coating,Sb_(2)WO_(6)@PPy exhibits boosted potassium storage properties,thereby demonstrating an outstanding rate property of 110.3 m A h g^(-1)at 5 A g^(-1)and delivering a long-period cycling stability with a reversible capacity of 197.2 m A h g^(-1)after 500 cycles at 1 A g^(-1).In addition,the conversion and alloying processes of Sb_(2)WO_(6)@PPy in PIBs with the generation of intermediates,K_(2)WO_(4)and K_(3)Sb,is determined by X-ray photoelectron spectroscopy,transmission electron microscopy,and exsitu X-ray diffraction during potassiation/*** functional theory calculations demonstrate that the robust coupling between PPy and Sb_(2)WO_(6)endues it with a much stronger total density of states and a built-in electric field,thereby increasing the electronic conductivity,and thus effectively reduces the K^(+)diffusion barrier.

关键词： Sb_(2)WO_(6) Polypyrrole coating Anode Potassium-ion battery In-situ TEM observation

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Characteristics:Evidence from the“Enclave Economy”in the PRD Region

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China Economist 2024年第4期19卷 89-106页

作者： Tang Yugang zhang hehe School of Economics Shandong UniversityJinanChina

Paired assistance is an important means for developed regions to help lessdeveloped regions achieve common *** its advantages,governmentmandated paired assistance tends to be less effective due to the lack of economic incentives for assisting ***,local governments in China have explored an incentivecompatible paired assistance *** on the paired assistance between cities in the Pearl River Delta(PRD)region and the eastern,western and northern parts of Guangdong Province,this study designed a natural experiment for the network relationship of paired *** results based on industrial and commercial registration data and land transfer data indicate that paired assistance has enhanced bilateral investment linkages,and that the inter-regional benefit sharing mechanism has incentivized assisting localities to provide paired *** heterogeneity analysis reveals that a shorter distance between assisting and beneficiary localities may lead to better results of paired *** study contributes to the understanding of incentive mechanisms for local government cooperation and offers insights for balancing regional development and achieving common prosperity.

关键词： Paired assistance enclave economy inter-regional benefit sharing

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中国特色对口帮扶及其效应研究:来自珠三角“飞地经济”的证据

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财贸经济 2024年第4期45卷 20-35页

作者：汤玉刚张鹤鹤山东大学经济学院 250100

对口帮扶是发达地区帮助欠发达地区实现共同富裕的重要方式。以行政性力量为主导的对口帮扶有其优势,但由于帮扶方经济激励不足,帮扶效果往往不佳。为此,地方政府结合“飞地经济”,以帮扶双方共建产业园区为载体,引入利益分享机制,探索... 详细信息

对口帮扶是发达地区帮助欠发达地区实现共同富裕的重要方式。以行政性力量为主导的对口帮扶有其优势,但由于帮扶方经济激励不足,帮扶效果往往不佳。为此,地方政府结合“飞地经济”,以帮扶双方共建产业园区为载体,引入利益分享机制,探索出了一种激励兼容的对口帮扶模式。本文以珠三角城市对口帮扶粤东西北为背景,借助对口帮扶网络关系设计自然实验。基于工商注册数据和土地出让数据的实证结果表明,对口帮扶加强了双边投资关联,利益分享机制增强了帮扶的激励。异质性分析表明,帮扶双方距离越近,帮扶效果越好。本研究有助于理解地方政府间合作的激励机制,为实现区域平衡发展、探索共同富裕提供了思路。

关键词：对口帮扶飞地经济政府间利益分享

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钾离子电池硬碳负极材料研究进展

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电力科技与环保 2024年第3期40卷 221-236页

作者：张博张贺贺马妍姣南京师范大学能源与机械工程学院江苏南京210023

随着大规模储能系统需求的不断攀升,具有成本和资源优势的钾离子电池引起了广泛的关注。在实际应用中,硬碳因其来源广泛、价格低廉、环境友好、结构可调控性高等优点而被认为是钾离子电池最具潜力的负极材料之一。硬碳负极仍然面临比容... 详细信息

随着大规模储能系统需求的不断攀升,具有成本和资源优势的钾离子电池引起了广泛的关注。在实际应用中,硬碳因其来源广泛、价格低廉、环境友好、结构可调控性高等优点而被认为是钾离子电池最具潜力的负极材料之一。硬碳负极仍然面临比容量有限、嵌钾可逆性低、倍率性能差等问题。本文系统地总结了钾离子电池硬碳负极材料的研究进展,介绍了硬碳的微观结构特征以及电化学储钾行为,阐述了微观结构和储钾机理之间的构效关系。针对硬碳负极存在的挑战,本文总结提出了结构调控、杂原子掺杂、电解液优化等3种提升储钾性能的策略。对未来钾离子电池硬碳负极研究的发展方向进行了展望,包括新型材料设计、电解液设计优化和深入理解电极反应机制等方面,有助于推动钾离子电池硬碳负极材料的进一步发展。

关键词：钾离子电池硬碳负极结构调控杂原子掺杂电解液优化

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FPSO工作舱水下检测装置耦合运动响应

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海洋工程装备与技术 2024年第2期11卷 116-122页

作者：张宝雷孙冰张贺贺陈晓田国治中海油能源发展股份有限公司采油服务分公司天津300452

在海洋工程和深海探索中,水下机器人被广泛应用。由于FPSO作业海况复杂、恶劣,释放与回收ROV是影响其作业能力的重要因素。需根据作业特点及水下检测装置重量,选取最优的收放方式;搜集目标海域海况资料,分析水下检测装置在作业海域中收... 详细信息

在海洋工程和深海探索中,水下机器人被广泛应用。由于FPSO作业海况复杂、恶劣,释放与回收ROV是影响其作业能力的重要因素。需根据作业特点及水下检测装置重量,选取最优的收放方式;搜集目标海域海况资料,分析水下检测装置在作业海域中收放过程的运动响应情况。本文以陆丰12-3油田FPSO工作舱实施作业为背景,使用AQWA软件建立FPSO与水下检测装置模型,进行水下检测装置、船舶及其系泊系统的水动力响应分析;并将其与试验值对比,计算模拟分析与试验结果较为接近,可靠性较高。最后,根据水下检测装置在最危险工况下的运动幅度,选择合适的吊臂行程。

关键词：水下检测收放技术水动力系泊系统

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Synthesis of yolk-shell Bi_(2)O_(3)@TiO_(2) submicrospheres with enhanced potassium storage

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Science China Chemistry 2022年第9期65卷 1807-1816页

作者： Yifan Xu hehe zhang Tangjing Ding Ruiqi Tian Dongmei Sun Ming-Sheng Wang Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China

Due to their enormous potential for large-scale energy storage,rechargeable potassium-ion batteries have been widely researched and ***,the drastic volume change of electrode materials induced by the huge size of potassium ions during cycling remains a challenge for the construction of stable ***,we propose a novel weak acid etching strategy to design and fabricate robust yolk-shell spheres with enough internal void space,in which the Bi_(2)O_(3) nanospheres are well confined in the compartments of TiO_(2) submicrospheres(y-Bi_(2)O_(3)@TiO_(2)).In situ transmission electron microscopy(TEM)and ex situ Xray diffraction(XRD)are conducted to elucidate the structural evolution of y-Bi_(2)O_(3)@TiO_(2) and the interaction between K^(+)and Bi_(2)O_(3) during *** to the yolk-shell nanoarchitecture and the superior buffering property of outer TiO_(2) covering,the as-obtained composite shows a high specific capacity of 383.5 mAh g^(−1) at 100 mA g^(−1),a considerable rate capacity of 134.1 mAh g^(−1) at 2 A g^(−1) and a stable cycling performance of 216.8 mAh g^(−1) at 500 mA g^(−1) over 500 cycles when used for potassium ***,the potassium-ion full battery,constructed by pairing y-Bi_(2)O_(3)@TiO_(2) anode with the thermally annealed 3,4,9,10-perylenetetracarboxylic dianhydride(PTCDA)cathode,exhibits an outstanding cycling ***,this carefully-designed strategy can inspire the further development of superior energy storage materials in the near future.

关键词： Bi_(2)O_(3) amorphous TiO_(2) yolk-shell structure anode potassium-ion batteries

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Transformation of Laves phases and its effect on the mechanical properties of TIG welded Mg-Al-Ca-Mn alloys

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Journal of Materials Science & Technology 2022年第25期120卷 108-117页

作者： Sensen Chai Shiyu Zhong Qingshan Yang Daliang Yu Qingwei Dai hehe zhang Limeng Yin Gang Wang Zongxiang Yao School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The effects of Al content and Ca/Al mass ratio on the microstructure and mechanical properties of tungsten inert gas(TIG)welded Mg-2Ca-x Al-0.5Mn(x=0,1,5)alloy joints were studied in present *** showed that increasing Al content was effective in reducing the dendrite spacing at the fusion zone(FZ)*** Laves phases in the FZ and the heat-affected zone(HAZ)can be changed from Mg_(2)Ca to(Mg,Al)_(2)Ca with the decrease of Ca/Al ratio,and the(Mg,Al)_(2)Ca could be further transformed to Al_(2)Ca under welding thermal ***,dynamic dissolution and precipitation of Laves phases and Al_(8)Mn_(5)phases occurred in the HAZ,resulting in a gradient microstructure and hardness peak in this *** tensile properties of the joints were significantly improved with the increase of Al content,which was mainly due to the modification of Laves phases.

关键词： Mg-Al-Ca-Mn alloy Weld Laves phase Microstructure Mechanical properties

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Synergistic coupling of amorphous carbon and graphitic domains toward high-rate and long-life K^(+) storage

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Journal of Energy Chemistry 2022年第10期31卷 533-541,I0013页

作者： hehe zhang Wangqin Li Jianhai Pan Zhefei Sun Bensheng Xiao Weibin Ye Chengzhi Ke Haowen Gao Yong Cheng Qiaobao zhang Ming-Sheng Wang State Key Laboratory of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005FujianChina Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials(Xiamen University) Xiamen 361005FujianChina

Amorphous carbon materials hold great potential for practical use in potassium-ion batteries(PIBs)due to their abundant resources,low cost and high structural ***,given the challenge of sluggish potassiation kinetics,the rate performance of amorphous carbon is severely ***,amorphous carbon compounded with graphitic domains(HG-CNTs)was proposed as an advanced anode for *** directly verified by in situ transmission electron microscopy(TEM),the graphitic domains guarantee fast K-ions transport in the carbon composite at a high current density,while the amorphous carbon shells ensure the structural integrity during potassiation,thus boosting its fast and durable K^(+)*** a PlB anode,the HG-CNTs electrode exhibits not only a super-stable long-term cyclability(191.6 mAh g^(-1)at 1 A g^(-1)with almost no capacity decay over 3000 cycles),but also an outstanding rate performance(184.5 mAh g^(-1)at 2 A g^(-1)).Ex situ Raman and TEM results further suggest that the highly reversible structure of HG-CNTs is responsible for its superior electrochemical *** work provides helpful insights into the development of carbonaceous electrodes with both high rate capability and long cycle life for PIBs.

关键词： Potassium-ion batteries Amorphous carbon Graphitic domains Synergistic effect In situ TEM

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Achieving high-capacity and long-life K^(+)storage enabled by constructing yolk-shell Sb_(2)S_(3)@N,S-doped carbon nanorod anodes

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Journal of Energy Chemistry 2023年第1期76卷 547-556,I0014页

作者： Bensheng Xiao hehe zhang Zhefei Sun Miao Li Yingzhu Fan Haichen Lin Haodong Liu Bing Jiang Yanbin Shen Ming-Sheng Wang Meicheng Li Qiaobao zhang Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials(Xiamen University) Xiamen 361005FujianChina Department of Nanoengineering University of California San DiegoLa JollaCA92093United States State Key Laboratory of Altermate Electrical Power System with Renewable Energy Sources Schoolof New EnergyNorth China Electric Power UniversityBeijing 102206China i-Lab CAS Center for Excellence in NanoscienceSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123JiangsuChina

As promising anode candidates for potassium-ion batteries(PIBs),antimony sulfide(Sb_(2)S_(3))possesses high specific capacity but suffers from massive volume expansion and sluggish kinetics due to the large K^(+)insertion,resulting in inferior cycling and rate *** address these challenges,a yolk-shell structured Sb_(2)S_(3)confined in N,S co-doped hollow carbon nanorod(YS-Sb_(2)S_(3)@NSC)working as a viable anode for PIBs is *** directly verified by in situ transmission electron microscopy(TEM),the buffer space between the Sb_(2)S_(3)core and thin carbon shell can effectively accommodate the large expansion stress of Sb_(2)S_(3)without cracking the shell and the carbon shell can accelerate electron transport and K^(+)diffusion,which plays a significant role in reinforcing the structural stability and facilitating charge *** a result,the YS-Sb_(2)S_(3)@NSC electrode delivers a high reversible K^(+)storage capacity of 594.58 m A h g^(-1)at 0.1 A g^(-1)and a long cycle life with a slight capacity degradation(0.01%per cycle)for 2000 cycles at 1 A g^(-1)while maintaining outstanding rate ***,utilizing in in situ/ex situ microscopic and spectroscopic characterizations,the origins of performance enhancement and K^(+)storage mechanism of Sb_(2)S_(3)were clearly *** work provides valuable insights into the rational design of high-performance and durable transition metal sulfides-based anodes for PIBs.

关键词： Antimony sulfide Yolk-shell structure In situ TEM Potassium-ion batteries Super-stable cyclability

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Boosting the potassium-ion storage performance enabled by engineering of hierarchical MoSSe nanosheets modified with carbon on porous carbon sphere

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Science Bulletin 2022年第9期67卷 933-945,M0004页

作者： Mengting Cai hehe zhang Yinggan zhang Bensheng Xiao Lei Wang Miao Li Ying Wu Baisheng Sa Honggang Liao Li zhang Shuangqiang Chen Dong-Liang Peng Ming-Sheng Wang Qiaobao zhang Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China Department of Chemical Engineering School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Materials and Energy Lanzhou UniversityLanzhou 730000China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China Key Laboratory of Eco-materials Advanced Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

Developing suitable electrode materials capable of tolerating severe structural deformation and overcoming sluggish reaction kinetics resulting from the large radius of potassium ion(K+)insertion is critical for practical applications of potassium-ion batteries(PIBs).Herein,a superior anode material featuring an intriguing hierarchical structure where assembled MoSSe nanosheets are tightly anchored on a highly porous micron-sized carbon sphere and encapsulated within a thin carbon layer(denoted as Cs@MoSSe@C)is reported,which can significantly boost the performance of *** assembled MoSSe nanosheets with expanded interlayer spacing and rich anion vacancy can facilitate the intercalation/deintercalation of K+and guarantee abundant active sites together with a low K+diffusion ***,the thin carbon protective layer and the highly porous carbon sphere matrix can alleviate the volume expansion and enhance the charge transport within the *** these merits,the as-prepared Cs@MoSSe@C anode exhibits a high reversible capacity(431.8 mAh g^(-1) at 0.05 A g^(-1)),good rate capability(161 mAh g^(-1) at 5 A g^(-1)),and superior cyclic performance(70.5%capacity retention after 600 cycles at 1 A g^(-1)),outperforming most existing Mo-based S/Se *** underlying mechanisms and origins of superior performance are elucidated by a set of correlated in-situ/ex-situ characterizations and theoretical ***,a PIB full cell based on Cs@MoSSe@C anode also exhibits an impressive electrochemical *** work provides some insights into developing high-performance PIBs anodes with transition-metal chalcogenides.

关键词： Potassium-ion storage performance Electrode materials Potassium-ion batteries Transition-metal chalcogenides

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