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ZnS-assisted evolution of N,S-doped hierarchical porous carbon nanofiber membrane with highly exposed Fe-N_(4)/C_(x) sites for rechargeable Zn-air battery

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Journal of Energy Chemistry 2022年第12期75卷 430-440,I0011页

作者： Leping Yang lingxiao yu Zheng-Hong Huang Feiyu Kang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina

Binder-free bifunctional electrocatalysts are attractive for rechargeable Zn-air batteries(ZABs)in gridscale energy storage and flexible electronics,but suffering from the sluggish mass transport and inadequate catalytic ***,we propose a scalable approach of in-situ engineering highly exposed Fe-N_(4)/Cxsites on the N,S-doped porous carbon nanofiber membrane as a binder-free air electrode catalyst for *** nanospheres are firstly used as integrated structure-directing agents to facilitate the electronic modulation of Fe-N_(4)/Cxsites by S doping and construct the hierarchical macro/meso/micropores at high *** additional step for removal of ZnS nanospheres nor doping process is required,significantly simplifying the pore formation process and improving the S doping *** from the enhanced intrinsic activity of high-density Fe-N_(4)/Cxsites(23.53μmol g^(-1))and the optimized mass transport of carbon nanofibers,as-synthesized electrocatalyst shows a positive half-wave potential of 0.89 V for oxygen reduction reaction and a small overpotential of 0.47 V at 10 m A cm^(-2)for oxygen evolution *** used as the air cathode catalyst for ZABs,it delivers a high specific capacity of 699 m Ah g^(-1)at 5 m A cm^(-2),a large peak power density of 228 m W cm^(-2)and a prolonged cycling over 1000 *** 10 m A cm^(-2),a robust structure with atomically dispersed Fe is also remained after cycling for 420 *** to the flexible properties of the electrocatalyst,as-assembled quasi-solid-state ZAB shows stable cycling over 90 h at alternately flat/bent states,demonstrating great prospects in flexible electronic device applications.

关键词： Electrospinning Single-atom catalysts Fe-N_(4)/C_(x) Oxygen electrocatalysis Zn-air batteries

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Ultra-high sensitivity fiber optic microphone with corrugated graphene-oxide diaphragm for voice recognition

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Nano Research 2024年第8期17卷 7593-7602页

作者： Yang Liu Cheng Li lingxiao yu Zhengwei Wu Shangchun Fan Ruitao Lv School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China Shenzhen Institute of Beihang University Shenzhen 518063China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100190China

To avoid interference from unexpected background noises and obtain high fidelity voice signal,acoustic sensors with high sensitivity,flat frequency response,and high signal-to-noise ratio(SNR)are urgently needed for voice ***(GO)has received extensive attention due to its advantages of controllable thickness and high fracture ***,low mechanical sensitivity(SM)introduced by undesirable initial stress limits the performance of GO material in the field of voice *** alleviate the aforementioned issue,GO diaphragm with annular corrugations is *** means of the reusable copper mold machined by picosecond laser,the fabrication and transfer of corrugated GO diaphragm are realized,thus achieving a Fabry–Perot(F–P)acoustic *** from the structural advantage of the corrugated GO diaphragm,our F–P acoustic sensor exhibits high S_(M)(43.70 nm/Pa@17 kHz),flat frequency response(−3.2 to 3.7 dB within 300–3500 Hz),and high SNR(76.66 dB@1 kHz).In addition,further acoustic measurements also demonstrate other merits,including an excellent frequency detection resolution(0.01 Hz)and high time stability(output relative variation less than 6.7% for 90 min).Given the merits presented before,the fabricated F–P acoustic sensor with corrugated GO diaphragm can serve as a high-fidelity platform for acoustic detection and voice *** conjunction with the deep residual learning framework,high recognition accuracy of 98.4%is achieved by training and testing the data recorded by the fabricated F–P acoustic sensor.

关键词： corrugated graphene-oxide(GO)diaphragm Fabry-Perot(F-P)acoustic sensor mechanical sensitivity voice recognition

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Efficient electrocatalytic overall water splitting and structural evolution of cobalt iron selenide by one-step electrodeposition

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Journal of Energy Chemistry 2021年第9期30卷 194-201页

作者： Haonan Ren lingxiao yu Leping Yang Zheng-Hong Huang Feiyu Kang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua University100084 BeijingChina Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

Developing bifunctional electrocatalysts with both high catalytic activity and high stability is crucial for efficient water splitting in alkaline ***,a Fe-incorporated dual-metal selenide on nickel foam(Co_(0.9)Fe_(0.1)-Se/NF) is synthesized via a facile one-step electrodeposition ***-synthesized materials could serve as self-supported bifunctional electrocatalysts with excellent catalytic activity towards oxygen evolution reaction(OER) and hydrogen evolution reaction(HER) in alkaline *** results show that delivering a 10 mA cm^(-2) water splitting current density only requires a cell voltage of 1.55 *** addition,a very stable performance could be kept for about 36 hours,indicating their excellent working ***,by means of phase analysis,we have identified that the evolution of the synthesized Co_(0.9)Fe_(0.1)-Se/NF experiences two entirely different processes in HER and OER,which hydroxide and oxyhydroxide are regarded as the real active sites,*** work may pave the way to further understanding the relationships between the reactivity and stability of chalcogenide-based electrocatalysts and facilitating the rational design of efficient electrocatalysts for future renewable energy system applications.

关键词： Electrodeposition Overall water splitting Cobalt iron selenide Structural evolution Active sites

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Photoluminescence manipulation in two-dimensional transition metal dichalcogenides

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Journal of Materiomics 2023年第4期9卷 768-786页

作者： Minglang Gao lingxiao yu Qian Lv Feiyu Kang Zheng-Hong Huang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Institute of Materials Research Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China

Two-dimensional transition metal dichalcogenides(TMDCs)have been regarded as an intriguing platform for exploring novel physical phenomena and optoelectronic devices due to their excitonic emission characteristics derived from the atomic thin thickness and reduced dielectric screening ***,monolayer TMDCs with a direct bandgap exhibiting strong photoluminescence(PL)are promising candidates for the light-emitting devices,while the interlayer excitons in heterostructures hold great potential for the photonic chips and optical communication ***,the non-ideal photoluminescent intensity and quality due to the ultrathin thickness and high defect density of experimentally obtained monolayer TMDCs limit the further development for the light-emission ***,we summarize the research progress on the PL manipulation of the excitonic emission in TMDCs,where the PL intensity enhancement and emission wavelength regulation are *** concept and characteristics of excitons are overviewed firstly,followed by the discussion on the evaluation and characterization of excitonic *** state-of-the-art progress on the manipulation of the neutral excitons and interlayer excitons PL are then ***,the challenges and prospects are proposed.

关键词： 2D materials TMDCs Neutral exciton Interlayer exciton Photoluminescence enhancement

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Reduction in thermal conductivity of monolayer WS_(2) caused by substrate effect

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Nano Research 2022年第10期15卷 9578-9587页

作者： yufeng Zhang Qian Lv Aoran Fan lingxiao yu Haidong Wang Weigang Ma Ruitao Lv Xing Zhang Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Understanding the substrate and temperature effect on thermal transport properties of transition metal dichalcogenides(TMDs)monolayers are crucial for their future ***,a dual-wavelength flash Raman(DF-Raman)method is used to measure the thermal conductivity of monolayer WS_(2) at a temperature range of 200–400 *** measurement accuracy can be guaranteed in this method since the influence of both the laser absorption coefficient and temperature-Raman coefficient can be eliminated through *** room-temperature thermal conductivity of suspended and supported WS_(2) are 28.5±2.1(30.3±2.0)and 15.4±1.9(16.9±2.1)W/(m·K),respectively,with a~50%reduction due to substrate *** dynamics(MD)simulations reveal that the suppression of acoustic phonons is mainly responsible for the striking *** behaviors of optical phonons are also unambiguously investigated using Raman spectroscopy,and the in-plane optical mode,E(Γ),is surprisingly found to be slightly enhanced while out-of-plane mode,A1g(Γ),is suppressed due to substrate interaction,mutually verified with MD *** study provides a solid understanding of the phonon transport behavior of WS_(2) with substrate interaction,which provides guidance for TMDs-based nanodevices.

关键词： monolayer WS_(2),thermal conductivity,substrate effect,temperature effect,dual-wavelength flash Raman(DF-Raman)method

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北京平原造林主要栽植树种适应性及栽植配置研究

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林业资源管理 2019年第1期 153-157页

作者：于凌霄北京市大兴区林业工作站

在北京平原造林项目区内的大兴区,对永定河沿岸沙地、六环内拆迁腾退地和中东部壤土地的林木保存率、树高、冠幅等指标进行树种适应性及配置研究。研究结果表明:1)永定河沿岸沙地,刺槐、千头椿、香花槐、新疆杨、金叶榆、金叶槐、法桐... 详细信息

在北京平原造林项目区内的大兴区,对永定河沿岸沙地、六环内拆迁腾退地和中东部壤土地的林木保存率、树高、冠幅等指标进行树种适应性及配置研究。研究结果表明:1)永定河沿岸沙地,刺槐、千头椿、香花槐、新疆杨、金叶榆、金叶槐、法桐、毛白杨、栾树、旱柳和107杨等11个树种生态适应性较好,银杏和楸树次之,五角枫最差;2)六环和内拆迁腾退地,国槐、栾树、刺槐、白蜡、银杏、金叶榆和楸树7个树种生态适应性较好,玉兰泡桐次之,水杉、法桐和杜仲最差;3)中东部壤土地,刺槐、国槐、窄冠毛白杨、银杏、山杨、毛白杨、白榆和金叶榆等8个树种生态适应性较好,白蜡和栾树次之,法桐和臭椿最差。3种立地类型均按照相邻地块树种高度相近原则配置。

关键词：北京大兴平原造林树种选择栽植密度树种配置

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牦牛和普通牛CAPN4基因内含子6多态性分析

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基因组学与应用生物学 2017年第12期36卷 5099-5103页

作者：张丽刘丽霞陈红于凌霄西北民族大学生命科学与工程学院兰州730030

本研究采用PCR-SSCP技术和DNA测序法对大通牦牛、天祝白牦牛、甘南牦牛、普通牛4个群体CAPN4基因第6内含子的SNP多态性进行检测,并研究该基因在牦牛和普通牛群体中的遗传特征。试验所得表明:牦牛和普通牛CAPN4基因第6内含子表现出丰富... 详细信息

本研究采用PCR-SSCP技术和DNA测序法对大通牦牛、天祝白牦牛、甘南牦牛、普通牛4个群体CAPN4基因第6内含子的SNP多态性进行检测,并研究该基因在牦牛和普通牛群体中的遗传特征。试验所得表明:牦牛和普通牛CAPN4基因第6内含子表现出丰富的遗传多样性。CAPN4基因第6内含子检测到5种等位基因A-E,其中等位基因D和E仅存在于普通牛群体中。除天祝白牦牛外,等位基因B频率在其他3个牛群体中均在43%以上为优势等位基因。普通牛PIC0.5为高度多态。

关键词：牦牛普通牛 CAPN4基因单核苷酸多态性

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超高分子量聚乙烯织物的表面接枝改性及其抑菌性能研究

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现代纺织技术 2022年第2期30卷 134-140页

作者：俞凌晓吕汪洋王刚强陈文兴浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室杭州310018

为赋予超高分子量聚乙烯织物舒适和抑菌功能,采用多巴胺/聚乙烯亚胺交联共聚涂覆和铜离子配位制备具有亲水及抑菌功能的超高分子量聚乙烯织物(UHMWPE-PDA/PEI-Cu),使用扫描电子显微镜、X射线衍射、傅立叶红外光谱和X射线光电子能谱等对U... 详细信息

为赋予超高分子量聚乙烯织物舒适和抑菌功能,采用多巴胺/聚乙烯亚胺交联共聚涂覆和铜离子配位制备具有亲水及抑菌功能的超高分子量聚乙烯织物(UHMWPE-PDA/PEI-Cu),使用扫描电子显微镜、X射线衍射、傅立叶红外光谱和X射线光电子能谱等对UHMWPE-PDA/PEI-Cu织物的微观形貌结构和化学成分进行表征,并评价了UHMWPE-PDA/PEI-Cu织物对细菌的抗菌活性。结果表明,培养18 h后,UHMWPE-PDA/PEI-Cu织物对大肠杆菌和金黄葡萄球菌的抑菌率均大于99%,且与未改性的样品(UHMWPE)相比,UHMWPE-PDA/PEI-Cu织物的水接触角显著减小,其舒适性得到大幅改善。

关键词：超高分子量聚乙烯织物多巴胺聚乙烯亚胺铜离子抑菌性能

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