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3D Printing Engineered Multi-porous Cu Microelectrodes with In Situ Electro-Oxidation Growth of CuO Nanosheets for Long Cycle,High Capacity and Large Rate Supercapacitors

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 85-97页

作者： Tao Liu yuejiao chen Libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Developing excellent pseudocapacitive electrodes with long cycle,high areal capacity and large rate has been challenged.3 D printing is an additive manufacture technique that has been explored to construct microelectrodes of arbitrary geometries for high-energy–density *** comparison with conventional electrodes with uncontrollable geometries and architectures,3 D-printed electrodes possess unique advantage in geometrical shape,mechanical properties,surface area,especially in ion transport and charge ***,a desirable 3 D electrode with ordered porous structures can be elaborately designed by 3 D printing technology for improving electrochemical capacitance and rate *** this work,a designed,monolithic and ordered multi-porous 3 D Cu conductive skeleton was manufactured through 3 D direct ink writing technique and coated with Cu O nanosheet arrays by an in situ electro-oxidation *** from the highly ordered multiporous nature,the 3 D-structured skeleton can eff ectively enlarge the surface area,enhance the penetration of electrolyte and facilitate fast electron and ion *** a result,the 3 D-printed Cu deposited with electro-oxidation-generated CuO(3 DP Cu@Cu O)electrodes demonstrates an ultrahigh areal capacitance of 1.690 F cm^(-2)(38.79 F cm^(-3))at a large current density of 30 m A cm^(-2)(688.59 m A cm^(-3)),excellent lifespan of 88.20%capacitance retention after 10,000 cycles at 30 m A cm^(-2) and superior rate capability(94.31%retention,2-30 m A cm^(-2)).This design concept of 3 D printing multi-porous current collector with hierarchical active materials provides a novel way to build high-performance 3 D microelectrodes.

关键词： 3D printing Supercapacitor Microelectrode Copper oxide Multi-porous current High areal specific capacitance

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Powder metallurgical 3D nickel current collectors with plasma-induced Ni3N nanocoatings enabling long-life and dendrite-free lithium metal anode

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Journal of Energy Chemistry 2022年第9期31卷 149-157,I0005页

作者： Piao Qing Zhibin Wu yuejiao chen Fengcheng Tang Hao Yang Libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina

Building three-dimensional(3D) current collectors is a promising strategy to surmount the bottlenecks of lithium metal anodes(LMAs), but the regulation methodology of a 3D current collector has seldom been considered comprehensively concerning both skeleton architectures and surface coatings. Herein, a robust porous 3D nickel skeleton(NS) with lithiophilic NiN nanocoatings(NiN@NS) is synthesized via an integrative route of powder metallurgy/plasma-enhanced nitridation technics. The facile powder metallurgical method facilitates the adjustment of NS architectures toward sufficient electrolyte adsorption and even current density distribution, while the followed plasma-enhanced chemical vapor deposition(PECVD) method can induce compact NiN nanocoatings on NS, which reduces the Li nucleation overpotential, accelerates the Li-ion transfer, and facilitates a highly reversible oriented texture of Li deposition morphology owing to the dense and homogenous deposition of Li into the pores. The optimized NiN@NS current collector shows a high averaged Coulombic efficiency(CE) of 98.8% over 350cycles, a prolonged lifespan of 1000 h(at 2 mA cm^(-2)) in symmetrical cells, together with the significant performance in full cells. The ingenious methodology reported in this work can also be broadly applicable for the controllable production of other 3D skeletons with nitride nanocoatings for various applications.

关键词： 3D current collector Ni3N Lithium metal anode Plasma Powder metallurgy

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Mesoporous tin oxide nanospheres for a NO_x in air sensor

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Journal of Semiconductors 2017年第2期38卷 20-25页

作者： Haonan Zhang Ming Zhuo Yazi Luo yuejiao chen College of Electrical and Information Engineering Hunan University Changsha 410082 China

Mesoporous tin oxide（SnO_2/ with a high surface area of 147.5 m^2/g has been successfully synthesized via self-assembly process, combining the driven forces of water-evaporation and molecular interactions. Scanning electron microscope, X-ray diffraction, transmission electron micrograph, Fourier transform infrared and BrunauerEmmett-Teller were employed to analyze the morphology and crystal structure of the as-synthesized mesoporous materials. As a gas sensor, mesoporous SnO_2 shows impressive performances towards NOx gas with high selectivity and stability as well as ultra high sensitivity about 94.3 to 10 ppm NO_x gas at 300 ℃. The best response time of the sample S-500 is about 3.4 s to 10 ppm NO_x at 450℃.

关键词： mesoporous materials tin oxide sensor nanospheres

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Fast ion diffusion alloy layer facilitating 3D mesh substrate for dendrite-free zinc-ion hybrid capacitors

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Journal of Energy Chemistry 2022年第10期31卷 565-574,I0014页

作者： Huaming Yu Quanyu Li Wen Liu Han Wang Xuyan Ni Qiwen Zhao Weifeng Wei Xiaobo Ji yuejiao chen Libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina

Although aqueous zinc ion hybrid capacitors have advantageous integration of batteries and supercapacitors,they still suffer from the inherent problems of dendrite growth and interfacial side reactions on Zn ***,a universal fast zinc-ion diffusion layer on a three-dimensional(3 D)mesh structure model is demonstrated to effectively improve Zn plating/stripping *** fast ion diffusion alloy layer accelerates the Zn^(2+)migration in an orderly manner to homogenize Zn^(2+)flux and overcomes the defects of the commercial mesh substrate,effectively avoiding dendrite growth and side ***,the proof-of-concept silver-zinc alloy modified stainless steel mesh delivers superb reversibility with the high coulombic efficiency over 99.4%at 4 mA cm^(-2)after 1600 cycles and excellent reliability of over 830 h at 1 mA cm^(-2),Its feasibility is also evidenced in commercial zinc ion hybrid capacitors with activated carbon as the *** work enriches the fundamental comprehension of fast zinc-ion diffusion layer combined with a 3 D substrate on the Zn deposition and opens a universal approach to design advanced host for Zn electrodes in zinc ion hybrid capacitors.

关键词： Zinc-ion hybrid capacitors 3D metal mesh Flexible electrode Fast ion diffusion Alloy layer Zinc ion kinetics

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Water molecules regulation for reversible Zn anode in aqueous zinc ion battery:Mini-review

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Chinese Chemical Letters 2024年第8期35卷 50-61页

作者： Jie Zhou Quanyu Li Xiaomeng Hu Weifeng Wei Xiaobo Ji Guichao Kuang Liangjun Zhou Libao chen yuejiao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

With the low cost,excellent safety and high theoretical specific capacity,aqueous zinc-ion batteries(AZ-IBs)are considered as a potential rival for lithium-ion batteries to promote the sustainable development of large-scale energy storage ***,the notorious Zn dendrites and low Coulombic effi-ciency(CE)limit further development of AZIBs,due to the unstable electrochemical deposition/stripping behavior of Zn anode in aqueous zinc ion *** this review,critical issues and advances are summarized in electrolyte engineering *** strategies are focused on active water molecules during electrochemical process,including high-concentration electrolytes,ionic liquids,gel-polymer elec-trolytes and functional *** suppressed active water molecules,the solvation and de-solvation behavior of Zn^(2+)can be regulated,thereby modulating the electrochemical performance of Zn ***,the inherent problems of these strategies are discussed,and some promising directions are pro-vided on electrolytes engineering for high performance Zn anode in AZIBs.

关键词： Electrolyte engineering Aqueous zinc ion battery Zinc metal anode Dendrite suppression Mildly acidic electrolyte

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In Situ Formed Tribofilms as Efficient Organic/Inorganic Hybrid Interlayers for Stabilizing Lithium Metal Anodes

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Nano-Micro Letters 2023年第12期15卷 320-333页

作者： Shaozhen Huang Kecheng Long yuejiao chen Tuoya Naren Piao Qing Xiaobo Ji Weifeng Wei Zhibin Wu Libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China

The practical application of Li metal anodes(LMAs)is limited by uncontrolled dendrite growth and side ***,we propose a new friction-induced strategy to produce high-performance thin Li anode(Li@CFO).By virtue of the in situ friction reaction between fluoropolymer grease and Li strips during rolling,a robust organic/inorganic hybrid interlayer(lithiophilic LiF/LiC_(6)framework hybridized-CF_(2)-O-CF_(2)-chains)was formed atop Li *** derived interface contributes to reversible Li plating/stripping behaviors by mitigating side reactions and decreasing the solvation degree at the *** Li@CFO||Li@CFO symmetrical cell exhibits a remarkable lifespan for 5,600 h(1.0 mA cm^(-2)and 1.0 mAh cm^(-2))and 1,350 cycles even at a harsh condition(18.0 mA cm^(-2)and 3.0 mAh cm^(-2)).When paired with high-loading LiFePO4 cathodes,the full cell lasts over 450 cycles at 1C with a high-capacity retention of 99.9%.This work provides a new friction-induced strategy for producing high-performance thin LMAs.

关键词： Lithium metal anode Organic/inorganic hybrid interlayers High current density Fluoropolymer grease Local desolvation environment

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尖晶石LiMn2O4纳米棒的合成和储锂性能

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中南大学学报（自然科学版） 2020年第11期51卷 3211-3219页

作者：周钢陈月皎范洪波东莞理工学院生态环境与建筑工程学院广东东莞523808 中南大学粉末冶金国家重点实验室湖南长沙410083

为了改善LiMn2O4材料在锂离子电池应用中倍率放电性能和循环性能较差的问题,利用纳米化尺寸改善方案,对二维LiMn2O4纳米棒的储锂应用进行研究。通过水热法合成的α-MnO2纳米线与LiOH·H2O进行固相烧结制备尖晶石结构的LiMn2O4纳米棒,探... 详细信息

为了改善LiMn2O4材料在锂离子电池应用中倍率放电性能和循环性能较差的问题,利用纳米化尺寸改善方案,对二维LiMn2O4纳米棒的储锂应用进行研究。通过水热法合成的α-MnO2纳米线与LiOH·H2O进行固相烧结制备尖晶石结构的LiMn2O4纳米棒,探讨水热反应时间、温度和反应物物质的量比对前驱体α-MnO2形貌结构和性能的影响。研究结果表明:制备的LiMn2O4纳米棒比表面积大,有利于缩短Li^+扩散距离,较大的长径比可减少循环过程中材料的团聚,从而赋予LiMn2O4优异的循环性能。LiMn2O4纳米棒在1C倍率充放电时初始放电容量为104.8 mA·h/g,循环150圈时依旧可以保持初始容量的84.4%,而在3C倍率充放电时可以保持初始容量的75%,显示了较高的电化学储锂性能。

关键词：水热合成固相烧结锰酸锂纳米棒锂离子电池储锂性能

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P_＊(κ)线性互补问题基于一类新核函数的大步校正内点算法(英文)

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应用数学 2012年第1期25卷 61-70页

作者：陈月姣张明望三峡大学理学院湖北宜昌443002

本文采用一簇新的核函数设计原始-对偶内点算法用于解决P*(κ)线性互补问题.通过利用一些优良、简洁的分析工具,证明该算法具有O(q(2κ+1)n1/p(logn)1+1/qlog(n/ε))迭代复杂性.

关键词：核函数线性互补问题内点算法大步校正算法多项式复杂性

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基于阶梯式策略治疗儿童原发性膀胱过度活动症

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中华小儿外科杂志 2023年第11期44卷 1047-1051页

作者：邓常开陈月娇赵兴彭强电子科技大学医学院附属妇女儿童医院·成都市妇女儿童中心医院泌尿外科成都611731

原发性膀胱过度活动症(overactive bladder,OAB)是一种常见的下尿路功能障碍症候群,儿童发生率较高,不仅对生活质量产生负面影响,而且也会导致上尿路功能受损,对个人、家庭及社会造成沉重的经济和心理负担。阶梯式治疗策略开始时给予侵... 详细信息

原发性膀胱过度活动症(overactive bladder,OAB)是一种常见的下尿路功能障碍症候群,儿童发生率较高,不仅对生活质量产生负面影响,而且也会导致上尿路功能受损,对个人、家庭及社会造成沉重的经济和心理负担。阶梯式治疗策略开始时给予侵袭性最小的治疗,如果无效,则采用侵袭性更大和/或花费更高的干预措施,对于患儿和其家庭都是一种明智的选择。

关键词：膀胱,过度活动性儿童治疗

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手机信令数据在旅游交通中的应用

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信息与电脑 2017年第9期29卷 128-130页

作者：陈月姣中国交通通信信息中心北京100011

为了满足公众不断增长的旅游和交通消费需求,提升旅游和交通行业市场监管水平,推动旅游和交通服务模式创新,进一步提升旅游和交通服务品质,大力推进跨地区、跨行业、跨部门数据融合应用。笔者以手机信令数据为研究对象,阐明了旅游交通... 详细信息

为了满足公众不断增长的旅游和交通消费需求,提升旅游和交通行业市场监管水平,推动旅游和交通服务模式创新,进一步提升旅游和交通服务品质,大力推进跨地区、跨行业、跨部门数据融合应用。笔者以手机信令数据为研究对象,阐明了旅游交通的现状和主要问题,论述了手机信令数据在旅游交通行业中的应用,最后提出了发展旅游交通的几点建议。

关键词：手机信令数据旅游交通人口密度监测

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