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Comparative study of photocatalytic performance of titanium oxide spheres assembled by nanorods,nanoplates and nanosheets

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International Journal of Smart and Nano Materials 2012年第1期3卷 72-80页

作者： meinan liu Jin Chang Cheng Yan John Bella School of Engineering Systems Queensland University of Technology2 George StreetBrisbaneQueensland 4001Australia Chemistry Discipline Queensland University of Technology2 George StreetBrisbaneQueensland 4001Australia

TiO_(2) spheres assembled by nanorods,nanoplates and nanosheets were fabricated by facile hydrothermal/solvothermal methods.The three samples were thoroughly characterised by scanning electron microscopy,X-ray diffraction,the Brunauer-Emmett-Teller method and UV spectroscopy.The surface area of spheres assembled by nanosheets was 83.9 m^(2)g^(-1),which is larger than that obtained for nanorods(10.8 m2g-1)and nanoplates(6.31 m^(2)g^(-1)).Their photocatalytic performance was evaluated in terms of the decomposition rate of methyl orange in these three samples under UV irradiation.The best photoactivity was observed in the samples constructed from nanosheets.

关键词： titanium oxide hierarchical spheres photocatalyst

Chemical routes toward long-lasting lithium/sulfur cells

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Nano Research 2016年第1期9卷 94-116页

作者： meinan liu Fangmin Ye Wanfei Li Hongfei Li Yuegang Zhang i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China Department of Physics Tsinghua University Beijing 100084 China

Lithium/sulfur （Li/S） cells have great potential to become mainstream secondary batteries due to their ultra-high theoretical specific energy. The major challenge for Li/S cells is the unstable cycling performance caused by the sulfur＇s insulating nature and the high-solubility of the intermediate polysulfide products. Several years of efforts to develop various fancy carbon nanostructures, trying to physically encapsulate the polysulfides, did not yet push the cell＇s cycle life long enough to compete with current Li ion cells. The focus of this review is on the recent progress in chemical bonding strategy for trapping polysulfides through employing functional groups and additives in carbon matrix. Research results on understanding the working mechanism of chemical interaction between polysulfides and functional groups （e.g. 0-, B-, N- and S-） in carbon matrix, metal-based additives, or polymer additives during charge/discharge are discussed.

关键词： lithium/sulfur battery,chemical bonding,functional group,additive,lithium polysulfide

In-situ growth of vertically aligned nickel cobalt sulfide nanowires on carbon nanotube fibers for high capacitance all-solid-state asymmetric fiber-supercapacitors

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Journal of Energy Chemistry 2020年第2期29卷 209-215页

作者： Na liu Zhenghui Pan Xiaoyu Ding Jie Yang Guoguang Xu Linge Li Qi Wang meinan liu Yuegang Zhang i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina School of Physical Science and Technology Shanghai Tech UniversityShanghai 200120China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China Department of Physics Tsinghua UniversityBeijing 100084China

Fiber-supercapacitors(FSCs)are promising power sources for miniature portable and wearable electronic devices.However,the development and practical application of these FSCs have been severely hindered by their low volumetric capacitance and narrow operating voltage.In this work,vertically aligned nickel cobalt sulfide(Ni Co2S4)nanowires grown on carbon nanotube(CNT)fibers were achieved through an in-situ two-step hydrothermal reaction method.The as-prepared Ni Co2S4@CNT fiber electrode exhibits a high volumetric capacitance of 2332 F cm-3,benefiting from its superior electric conductivity,large surface area,and rich Faradic redox reaction sites.Furthermore,a Ni Co2S4@CNT//VN@CNT(vanadium nitride nanosheets grown on CNT fibers)asymmetric fiber-supercapacitor(AFSC)was successfully fabricated.The device exhibits an operating voltage up to 1.6 V and a high volumetric energy density of 30.64m Wh cm-3.The device also possesses outstanding flexibility as evidenced by no obvious performance degradation under various bending angles and maintaining high capacitance after 5000 bending cycles.This work promotes the practical application of flexible wearable energy-storage devices.

关键词： Fiber-supercapacitors Volumetric energy density Nickel cobalt sulfide nanowires Carbon nanotube fiber Wearable energy storage devices

Infiltrating lithium into carbon doth decorated with zinc oxide arrays for dendrite-free lithium metal anode

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Nano Research 2019年第3期12卷 525-529页

作者： Xianshu Wang Zhenghui Pan Yang Wu Xiaoyu Ding Xujia Hong Guoguang Xu meinan liu Yuegang Zhang Weishan Li School of Chemistry and Environment South China Normal University Guangzhou 510006 China i-lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China Department of Physics Tsinghua University Beijing 100084 China Engineering Research Center of MTEES (Ministry of Education) Research Center of BMET (Guangdong Province) and Key Laboratory of ETESPG (GHEI) South China Normal University Guangzhou 510006 China

Lithium metal anode for batteries has attracted extensive attentions, but its application is restricted by the hazardous dendritic Li growth and dead Li formation. To address these issues, a novel Li anode is developed by infiltrating molten Li metal into conductive carbon cloth decorated with zinc oxide arrays. In carbonate-based electrolyte, the symmetric cell shows no short circuit over 1,500 h at 1 mA·cm^-2, and stable voltage profiles at 3 mA cm^-2 for ~ 300 h cycling. A low overpotential of ~ 243 mV over 350 cycles at a high current density of 10 mA·cm^-2 is achieved, compared to the seriously fluctuated voltage and fast short circuit in the cell using bare Li metal. Meanwhile, the asymmetric cell withstands 1,000 cycles at 10 C (1 C = 167 mAh·g^-1) compared to the 210 cycles for the cell using bare Li anode. The excellent performance is attributed to the well-regulated Li plating/stripping drive n from the formation of LiZn alloy on the wavy carb on fibers, resulting in the suppress!on of dendrite growth and pulverization of the Li electrode during cycling.

关键词： lithium metal anodes lithium plating/stripping dendrite-free thermal infiltration carbon cloth zinc oxide nanowire arrays

Recent Advances in Fabrication and Characterization of Graphene-Polymer Nanocomposites

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Graphene 2012年第2期1卷 30-49页

作者： Dilini Galpaya Mingchao Wang meinan liu Nunzio Motta Eric Waclawik Cheng Yan School of Chemistry Physics and Mechanical Engineering Faculty of Science and Engineering Queensland University of Technology Brisbane Australia School of Chemistry Physics and Mechanical Engineering Faculty of Science and Engineering Queensland University of Technology Brisbane Australia

Graphene has attracted considerable interest over recent years due to its intrinsic mechanical, thermal and electrical properties. Incorporation of small quantity of graphene fillers into polymer can create novel nanocomposites with im- proved structural and functional properties. This review introduced the recent progress in fabrication, properties and potential applications of graphene-polymer composites. Recent research clearly confirmed that graphene-polymer na-nocomposites are promising materials with applications ranging from transportation, biomedical systems, sensors, elec-trodes for solar cells and electromagnetic interference. In addition to graphene-polymer nanocomposites, this article also introduced the synergistic effects of hybrid graphene-carbon nanotubes (CNTs) on the properties of composites. Finally, some technical problems associated with the development of these nanocomposites are discussed.

关键词： Graphene Polymer nanocomposites Fabrications and Properties

Polyaniline-modified cetyltrimethylammonium bromide- graphene oxide-sulfur nanocomposites with enhanced performance for lithium-sulfur batteries

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Nano Research 2014年第9期7卷 1355-1363页

作者： Yongcai Qiu Wanfei Li Guizhu Li Yuan Hou Lisha Zhou Hongfei Li meinan liu Fangmin Ye Xiaowei Yang Yuegang Zhang i-LAB Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China

Conductive polymer coatings can boost the power storage capacity of lithium-sulfur batteries. We report here on the design and preparation-by combining a facile and green chemical deposition method with an oxidative polymerization approach-of polyaniline (PANI)-modified cetyltrimethylammonium bromide (CTAB)-graphene oxide (GO)-sulfur (S) nanocomposites with significantly enhanced performance in lithium-sulfur batteries. Such conductive polymer modified CTAB-GO-S nanocomposites as sulfur cathode materials can deliver high specific discharge capacities and long-term cycling performance, i.e., ∼970 mAh·g−1 at 0.2 C and ∼715 mAh·g−1 after 300 cycles, ∼820 mAh·g−1 at 0.5 C and ∼670 mAh·g−1 after 500 cycles, ∼770 mAh·g−1 at 1 C and ∼570 mAh·g−1 after 500 cycles. The capacity decay was as low as 0.036% per cycle at 0.5 C, and 0.051% per cycle at 1 C. Under the same condition, batteries using PANI-modified CTAB-GO-S as cathodes exhibited higher specific capacity and higher average coulombic efficiency compared with CTAB-decorated GO-S and GO-S nanocomposites. The improved performance can be attributed to the lower charge transfer resistance and the alleviated dissolution of polysulfides in the PANImodified CTAB-GO-S cathodes.

关键词：十六烷基三甲基溴化铵纳米复合材料聚合物改性循环性能多硫化物电池使用聚苯胺氧化石墨

原位透射电镜研究正交相五氧化二铌纳米片的电化学储钠机制

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物理化学学报 2022年第8期38卷 15-21页

作者：许国光王琪苏毅刘美男李清文张跃钢中国科学技术大学纳米技术与纳米仿生学院合肥230031 中国科学院苏州纳米技术与纳米仿生研究所江苏苏州215123 清华大学物理系北京100084

由于正交相五氧化二铌(T-Nb_(2)O_(5))为ReO_(3)型层状结构,锂、钠离子可以在其(001)平面快速脱嵌,而在[001]方向的传输一般较难。本研究通过原位透射电子显微镜(Transmission Electron Microscope,TEM)方法研究钠在T-Nb_(2)O_(5)纳米片... 详细信息

由于正交相五氧化二铌(T-Nb_(2)O_(5))为ReO_(3)型层状结构,锂、钠离子可以在其(001)平面快速脱嵌,而在[001]方向的传输一般较难。本研究通过原位透射电子显微镜(Transmission Electron Microscope,TEM)方法研究钠在T-Nb_(2)O_(5)纳米片(001)面内及[001]方向的钠离子电化学嵌入行为,发现由于纳米片晶体存在大量的位错和畴界,钠离子可通过这些缺陷穿越(001)面扩散,并进而在深层的(001)面内快速扩散。同时,本研究还发现刚合成的T-Nb_(2)O_(5)纳米片在[001]方向上存在调制结构,存在交替分布的压应变和张应变区域,而钠离子的嵌入可以调节这些应变分布。

关键词：原位透射电镜 T-Nb_(2)O_(5)纳米片钠离子电池钠化机理

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壁式喷头红外降温特性试验研究

红外技术 2023年第5期45卷 513-520页

作者：付云鹏范骏威杨卫英袁杰刘梅楠张祥瑞中国船舶及海洋工程设计研究院上海200011 南京航空航天大学飞行器环境控制与生命保障工业和信息化部重点实验室江苏南京210016 江苏科技大学能源与动力学院江苏镇江212100

随着红外探测技术的发展,水幕成为舰船红外隐身研究的焦点,而对于水幕降温与水雾遮蔽两种水幕效应对红外探测特性的影响及其内在的物理机制目前尚未形成统一的认识。针对舰船8~14μm波段的红外辐射问题,基于典型的壁式喷嘴建立壁式喷头... 详细信息

随着红外探测技术的发展,水幕成为舰船红外隐身研究的焦点,而对于水幕降温与水雾遮蔽两种水幕效应对红外探测特性的影响及其内在的物理机制目前尚未形成统一的认识。针对舰船8~14μm波段的红外辐射问题,基于典型的壁式喷嘴建立壁式喷头试验系统,研究了不同喷射距离、不同喷射总流量以及不同温度钢板对壁式喷头的红外降温特性的影响。试验结果表明,当目标钢板处于中空区和中空区与覆盖区交界,红外降温速率分别为2.03℃/min和3.31℃/min,处于覆盖区时,喷射存在非重叠区和重叠区,非重叠区降温速率最大为6.18℃/min,其同半径距离下的重叠区降温速率为6.54℃/min,且此时重叠区的红外降温时长为40 s,比非重叠区缩短了32 s。喷射总流量的增加对钢板的降温表现出明显的增益性,并且钢板初始温度越高,壁式喷头对其的降温速率越快。此外,水幕内外的钢板温差最大可达8.49℃,表明壁式喷头形成的水幕喷淋能有效遮掩钢板表面温度,降低舰船表面的红外可探测性,实现水幕喷淋隐身。该研究结果可对提高舰船的红外隐身性能提供技术参考。

关键词：壁式喷头红外隐身降温特性水幕喷淋

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车身焊装涂胶工艺研究

汽车工艺与材料 2019年第12期 40-43页

作者：刘美娜广州汽车集团股份有限公司汽车工程研究院

为了在车身生产制造过程中合理选用车身焊装常用胶,首先介绍车身焊装常用胶的种类和作用,然后研究焊装常用胶的涂胶工艺过程、车身涂胶位置及涂胶工艺要求,为实际生产过程中涂胶工艺的应用提供指导。

关键词：涂胶工艺位置工艺要求