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Optimally arranged TiO_(2)@MoS_(2) heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

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能源化学:英文版 2023年第8期83卷 496-508,I0012页

作者： Jeongyoub lee Changhoon Choi Jung Been Park Seungho Yu Jinho Ha Hyungsoo lee Gyumin Jang Young Sun Park Juwon Yun Hayoung Im Subin Moon soobin lee Jung-Il Choi Dong-Wan Kim Jooho Moon Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea School of Mathematics and Computing(Computational Science and Engineering) Yonsei UniversitySeoul 03722Republic of Korea

To overcome the serious technological issues affecting lithium-sulfur(Li-S) batteries,such as sluggish sulfur redox kinetics and the detrimental shuttle effect,heterostructure engineering has been investigated as a strategy to effectively capture soluble lithium polysulfide intermediates and promote their conversion reaction by integrating highly polar metal oxides with catalytically active metals ***,to fully exploit the outstanding properties of heterostructure-based composites,their detailed structure and interfacial contacts should be designed ***,optimally arranged TiO_(2)and MoS_(2)-based heterostructures(TiO_(2)@MoS_(2)) are fabricated on carbon cloth as a multifunctional interlayer to efficiently trap polysulfide intermediates and accelerate their redox *** to the synergistic effects between TiO_(2)and MoS_(2)and the uniform heterointerface distribution that induces the ideally oriented built-in electric field,Li-S batteries with TiO_(2)@MoS_(2)interlayers exhibit high rate capability(601 mA h g^(-1)at 5 C),good cycling stability(capacity-fade rate of 0.067% per cycle over 500 cycles at2 C),and satisfactory areal capacity(5.2 mA h cm^(-2)) under an increased sulfur loading of 5.2 mg cm^(-2).Moreover,by comparing with a MoS_(2)@TiO_(2)interlayer composed of reversely arranged heterostructures,the effect of the built-in electric field’s direction on the electrocatalytic reactions of polysulfide intermediates is thoroughly investigated for the first *** superior electrocatalytic activities of the rationally arranged TiO_(2)@MoS_(2)interlayer demonstrate the importance of optimizing the built-in electric field of heterostructures for producing high-performance Li-S batteries.

关键词： Lithium-sulfur batteries Shuttle effect TiO_(2)-MoS_(2)heterostructure engineering Built-in electric field Multifunctional interlayers

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Massively parallel direct writing of nanoapertures using multi-optical probes and super-resolution near-fields

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Microsystems & Nanoengineering 2022年第5期8卷 257-267页

作者： Changsu Park soobin Hwang Donghyun Kim Nahyun Won Runjia Han Seonghyeon Jeon Wooyoung Shim Jiseok Lim Chulmin Joo Shinill Kang School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Korea National Center for Optically-Assisted High Precision Mechanical Systems Yonsei UniversitySeoul 03722Korea Department of Materials Science and Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Korea School of Mechanical Engineering Yeungnam University280 Daehak-roGyeongsanGyungbuk 38541South Korea

Laser direct-writing enables micro and nanoscale patterning,and is thus widely used for cutting-edge research and industrial *** nanolithography methods,such as near-field,plasmonic,and scanning-probe lithography,are gaining increasing attention because they enable fabrication of high-resolution nanopatterns that are much smaller than the wavelength of ***,conventional methods are limited by low throughput and scalability,and tend to use electron beams or focused-ion beams to create *** this study,we developed a procedure for massively parallel direct writing of nanoapertures using a multi-optical probe system and superresolution near-fields.A glass micro-Fresnel zone plate array,which is an ultra-precision far-field optical system,was designed and fabricated as the multi-optical probe *** a chalcogenide phase-change material(PCM),multiple layers of Sb_(65)Se_(35) were used to generate the super-resolution near-field effect.A nanoaperture was fabricated through direct laser writing on a large-area(200×200mm^(2))multi-layered PCM.A photoresist nanopattern was fabricated on an 8-inch wafer via near-field nanolithography using the developed nanoaperture and an i-line commercial exposure *** other methods,this technique allows high-throughput large-area nanolithography and overcomes the gap-control issue between the probe array and the patterning surface.

关键词： lithography optical resolution

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韩国汉语学习者习得汉语“把”字句的偏误分析

韩国汉语学习者习得汉语“把”字句的偏误分析

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作者： Oh soobin（吴琇傧）湖北大学

学位级别：硕士

关于“把”字句的研究,前人已经有很多成果,但主要是汉语本体方面的,其他需要研究的方面还有很多,特别是如何与对外汉语教学相结合,有针对性地对不同国家学生学习把字的情况进行分析,这样的研究还不够。本文分析韩国汉语学习者习得汉语... 详细信息

关于“把”字句的研究,前人已经有很多成果,但主要是汉语本体方面的,其他需要研究的方面还有很多,特别是如何与对外汉语教学相结合,有针对性地对不同国家学生学习把字的情况进行分析,这样的研究还不够。本文分析韩国汉语学习者习得汉语“把”字句的情况,希望为对韩汉语教学把字句的开展提供一点帮助。本文研究的对象是以韩语为母语的学生习得把字句的问题。“把”字句是汉语中常见的句法之一,在口语交际中使用频率也非常高,“把”字句本身的学习有很多限制和难度,在以往的交流过程中,韩国留学生对这一种句法的掌握存在很大的问题,特别是初级水平的学生,无法很好的理解和使用“把抑”字句。因此,本文以现代汉语“把”字句的语料为基础,先对“把”字句进行分类,以此更好的让韩国留学生理解“把”字句,然后根据日常生活中韩国学生使用“把”字句的情况以及HSK动态作文语料库中韩国学生把字句的偏误情况,提出一个合理的教学策略,目的在于能找到一个合适的方式和途径,让韩国学生有效的理解和掌握“把”字句。本文结合韩国学生习得汉语“把”字句的实际情况,从以下几个方面入手进行了探究:(一)归纳现代汉语“把”字句的三大类型,即广义处置式、狭义处置式、致使义处置式。进而对三大类型具体细分,做到对汉语“把”字句有一个清晰的认识和理解。(二)找出韩语中与汉语各类把字句对应的表达方式;通过问卷调查分析韩国汉语学习者习得各类“把”字句的难度等级。(三)对HSK动态作文语料库中韩国汉语学习者使用汉语“把”字句的错句进行全面细致的分析,分类说明习得“把”字句的偏误类型(四)以习得各类“把”字句的难度等级为基础,结合韩国学生习得把字句的偏误情况以及韩语和汉语语法结构的不同,提出针对韩国学生学习汉语把字句的较合理的教学策略。

关键词：韩国汉语学习者 “把”字句难度等级偏误分析

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