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Regulation of the pore structure of carbon nanosheets based electrocatalyst for efficient polysulfides phase conversions

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Journal of Materials Science & Technology 2024年第4期171卷 37-46页

作者： Xiaoyang liu Jingbo Zhang kangli liu Shijie Zhang Rouhan Hou Xiaoyi Hu Peng Zhang Guosheng Shao State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) Xingyang 450100China

The practical applications of lithium-sulfur(Li-S)batteries are hampered by the sluggish redox kinetics and polysulfides shuttle in the cyclic process,which leads to a series of problems including the loss of active materials and poor cycling *** this paper,the pore structures of carbon nanosheets based electrocatalysts were precisely controlled by regulating the content of water-soluble KCl *** relationship between pore structures and Li-S electrochemical behavior was studied,which demonstrates a key influence of pore structure in polysulfides phase *** the liquid-sloid redox reaction of polysulfides,the micropores and small mesopores(d20 nm)and macropores played a decisive *** a typical exhibition,the nickel-embedded carbon nanosheets(Ni-CNS)with a high content of large mesopores and macropores can aid Li-S batteries in exhibiting stable cycling performance(760.1 mAh g^(-1)at 1 C after 300 cycles)and superior rate capac-ity(847.8 mAh g^(-1)at 2 C).Furthermore,even with high sulfur loading(8 mg cm^(−2))and low electrolyte(E/S is around 6μL mg^(-1)),the high area capacity of 7.7 mAh cm^(−2)at 0.05 C could be *** work can provide a guideline for the design of the pore structure of carbon-based electrocatalysts toward high-efficiency sulfur species redox reactions,and afford a general,controllable,and simple approach to constructing high performance Li-S batteries.

关键词： Hierarchical porous carbon network Electrocatalyst Molten salt templating method Modified separators Li-S batteries

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Enabling High-Performance Sodium Battery Anodes by Complete Reduction of Graphene Oxide and Cooperative In-Situ Crystallization of Ultrafine SnO_(2)Nanocrystals

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Energy & Environmental Materials 2023年第3期6卷 356-365页

作者： Junwu Sang kangli liu Xiangdan Zhang Shijie Zhang Guoqin Cao Yonglong Shen Guosheng Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Centre for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) XingyangZhengzhou 450100China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China

The main bottleneck against industrial utilization of sodium ion batteries(SIBs)is the lack of high-capacity electrodes to rival those of the benchmark lithium ion batteries(LIBs).Here in this work,we have developed an economical method for in situ fabrication of nanocomposites made of crystalline few-layer graphene sheets loaded with ultrafine SnO_(2)nanocrystals,using short exposure of microwave to xerogel of graphene oxide(GO)and tin tetrachloride containing minute catalyzing dispersoids of chemically reduced GO(RGO).The resultant nanocomposites(SnO_(2)@MWG)enabled significantly quickened redox processes as SIB anode,which led to remarkable full anode-specific capacity reaching 538 mAh g^(−1)at 0.05 A g^(−1)(about 1.45 times of the theoretical capacity of graphite for the LIB),in addition to outstanding rate performance over prolonged charge–discharge *** based on the optimized SnO_(2)@MWG delivered stable performance over 2000 cycles even at a high current density of 5 A g^(−1),and capacity retention of over 70.4%was maintained at a high areal loading of 3.4 mg cm^(−2),highly desirable for high energy density SIBs to rival the current benchmark LIBs.

关键词： in situ compositing microwave reduced graphene oxide sodium ion battery sodium ion battery anode ultrafine SnO_(2)nanocrystals

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Catalytic hosts with strong adsorption strength for long shelf-life lithium-sulfur batteries under lean electrolyte

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Nano Research 2023年第1期16卷 427-438页

作者： Siyuan Zhao Huayu Pei Quan Yang kangli liu Yuanyuan Huang Zhuo Wang Guosheng Shao Jinping liu Junling Guo State Center for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute Xingyang 450100China School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China

Low electrolyte/sulfur ratio(E/S)is an important factor in increasing the energy density of lithium-sulfur batteries(LSBs).Recently,the E/S has been widely lowered using catalytic hosts that can suppress“shuttle effect”during cycling by relying on a limited adsorption ***,the shelf-lives of these cathodes have not yet received ***,we show that the selfdischarge of sulfur cathodes based on frequently-used catalytic hosts is serious under low E/S because the“shuttle effect”during storage process caused by polysulfides(PSs)disproportionation cannot be suppressed using a limited adsorption *** further prove that the adsorption strength toward PSs,which is unfortunately weak in commonly-used catalytic hosts,is critical for effectively hindering the disproportionation of the ***,to verify this conclusion,we prepare a sulfur-doped titanium nitride(S-TiN)catalytic array *** the adsorption strength and catalytic activity of TiN can be improved by S doping simultaneously,the constructed S/S-TiN cathodes under a low E/S(6.5μL·mg−1)exhibit better shelf-life and cycle-stability than those of S/TiN *** work suggests that enhancing the adsorption strength of catalytic hosts,while maintaining their function to reduce E/S,is crucial for practical LSBs.

关键词： lithium-sulfur battery low electrolyte/sulfur ratio(E/S) self-discharge catalytic host adsorption strength

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In situ sulfur-doped graphene nanofiber network as efficient metal-free electrocatalyst for polysulfides redox reactions in lithium–sulfur batteries

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Journal of Energy Chemistry 2020年第8期29卷 281-290,I0010页

作者： Shijie Zhang Peng Zhang Ruohan Hou Bin Li Yongshang Zhang kangli liu Xilai Zhang Guosheng Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou 450001HenanChina Zhengzhou Materials Genome Institute Building 2ZhongyuanzhiguXingyang 450100HenanChina

The major challenge for realistic application of Li-S batteries lies in the great difficulty in breaking through the obstacles of the sluggish kinetics and polysulfides shuttle of the sulfur cathode at high sulfur loading for continuously high sulfur utilization during prolonged charge-discharge *** we demonstrate that large percentage of sulfur can be effectively incorporated within a three-dimensional(3D)nanofiber network of high quality graphene from chemical vapor deposition(CVD),through a simple ball-milling *** high quality graphene network provided continuous and durable channels to enable efficient transport of lithium ions and electrons,the in-situ sulfur doping from the alloying effect of ball milling facilitated desirable affinity with entire sulfur species to prevent sulfur loss and highly active sites to propel sulfur redox reactions over *** resulted in remarkable rate-performance and excellent cycling stability,together with large areal capacity at very high sulfur mass loading(Specific capacity over 666 mAh g-1after 300 cycles at 0.5 C,and areal capacity above 5.2 mAh cm-2at 0.2C at sulfur loading of 8.0 mg cm-2 and electrolyte/sulfur(E/S)ratio of 8μL mg-1;and high reversible areal capacities of 13.1 m Ah cm-2 at a sulfur load of 15 mg cm-2 and E/S of 5μL mg-1).

关键词： Lithium–sulfur–graphene batteries S-doped graphene Electrocatalyst High sulfur loading Electrospinning

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Confining sulfur in intact freestanding scaffold of yolk-shell nanofibers with high sulfur content for lithium-sulfur batteries

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Journal of Energy Chemistry 2020年第12期29卷 378-387页

作者： Xilai Zhang Peng Zhang Shijie Zhang Yongshang Zhang Ruohan Hou kangli liu Fujun Miao Guosheng Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001HenanChina Zhengzhou Materials Genome Institute Xingyang 40100HenanChina

Nanostructure design holds great potential in fabricating sulfur electrodes that host a high sulfur loading and still attain high electrochemical utilization for the developing of high-energy-density lithium-sulfur(Li-S) batteries. In this contribution, we introduce the yolk-shell structure into a freestanding carbon nanofibers film and construct a complete hollow yolk-shell Ti O2/carbon nanofibers@void@TiN@carbon(TiO2-CNFs@void@Ti N@C) composite. With inherent double conductive network and strong adsorption capability for polysulfides, the Ti O2-CNFs@void@Ti N@C composite can not only provide sufficient electrical contact for the insulating sulfur, but also effectively entrap polysulfides for prolonged cycle life. As a result, an excellent capacity retention ratio of 60.9% after 1000 cycles at 1 C as well as a high capacity of688.5 mA h g^(-1) at 5 C rate is accomplished with the cells employing Ti O2-CNFs@void@TiN @C as a cathode substrate for sulfur. Moreover, the TiO2-CNFs@void@Ti N@C composite, with a high S mass loading of9.5 mg cm^(-2), delivers a superb areal capacity of 8.2 mAh cm^(-2).

关键词： TiO2 TiN Electrospinning Lithium-sulfur batteries Carbon nanofibers Yolk-shell structure

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A functional gel polymer electrolyte based on PVDF-HFP/gelatin toward dendrite-free lithium metal batteries

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Nano Research 2024年第4期17卷 2790-2799页

作者： Xiaoyi Hu kangli liu Shijie Zhang Guosheng Shao S.Ravi P.Silva Peng Zhang State Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) ZhongyuanzhiguXingyang 450100China Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordGU27XHUK

The leakage of liquid electrolyte and the formation of lithium dendrites pose challenges to safety and stability of lithium metal batteries(LMBs).The appearance of gel polymer electrolyte(GPE)has obviously improved the safety of traditional ***,the limited inhibition of GPE on lithium dendrites is detrimental to the safety of ***,a kind of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)/gelatin(GN)GPE with high ionic conductivity,high-temperature resistance,and flame-retardancy,was prepared by electrospinning and soaking *** the electrospinning network of PVDF-HFP,its affinity to liquid electrolytes,makes this GPE more beneficial to ions transport and the formation of ***,the GN with sol–gel properties,enhances the mechanical property(13.5 MPa)of HFP-GN ***,X-ray photoelectron spectroscopy(XPS)and density functional theory(DFT)suggest that the attraction of polar groups of GN to Li+can regulate the distribution of Li+and protect Li ***,the application of HFP-GN GPEs to LMBs with cathodes of LiFePO_(4) and LiCoO_(2) deliver excellent electrochemical performances:after 300 cycles,the LiFePO_(4)/HFP-GN GPE/Li battery keeps a low capacity decay rate of 0.09%at 5 C;after 400 cycles at 2 C,the LiCoO_(2)/HFP-GN GPE/Li cell retains a high capacity retention of 74%.This GPE is demonstrated for the application prospect of safe LMBs.

关键词： poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) gelatin polar groups lithium metal battery lithium dendrite

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Li intercalation in an MoSe_(2) electrocatalyst:In situ observation and modulation of its precisely controllable phase engineering for a high-performance flexible Li-S battery

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Carbon Energy 2023年第2期5卷 201-215页

作者： Yunke Wang Yige Zhao kangli liu Shaobin Wang Neng Li Guosheng Shao Feng Wang Peng Zhang State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhouChina Zhengzhou Materials Genome Institute(ZMGI) XingyangZhengzhouChina School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSouth AustraliaAustralia State Key Laboratory of Silicate Materials for Architecture Wuhan University of TechnologyWuhanChina Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical TechnologyBeijingChina

Sophisticated efficient electrocatalysts are essential to rectifying the shuttle effect and realizing the high performance of flexible lithium-sulfur batteries(LSBs).Phase transformation of MoSe_(2) from the 2H phase to the 1T phase has been proven to be a significant method to improve the catalytic ***,precisely controllable phase engineering of MoSe_(2) has rarely been ***,by in situ Li ions intercalation in MoSe_(2),a precisely controllable phase evolution from 2H-MoSe_(2) to 1T-MoSe_(2) was *** importantly,the definite functional relationship between cut-off voltage and phase structure was first identified for phase engineering through in situ observation and modulation *** sulfur host(CNFs/1T-MoSe_(2))presents high charge density,strong polysulfides adsorption,and catalytic ***,Li-S cells based on it display capacity retention of 875.3mAh g^(-1) after 500 cycles at 1 C and an areal capacity of 8.71mAh cm^(-2) even at a high sulfur loading of 8.47mg cm^(-2).Furthermore,the flexible pouch cell exhibiting decent performance will endow a promising potential in the wearable energy storage *** study proposes an effective strategy to precisely control the phase structure of MoSe_(2),which may provide the reference to fabricate the highly efficient electrocatalysts for LSBs and other energy systems.

关键词： electrocatalysts electrospinning Li intercalation lithium-sulfur batteries phase engineering

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有源滤波输出限幅的需求分析和实现策略

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电工技术学报 2015年第14期30卷 405-411页

作者：曹武刘康礼赵剑锋东南大学电气工程学院南京210000

本文详细分析了有源电力滤波器需要限幅输出的三种情况,即指令电流超出装置容量、IGBT结温过高、超出直流侧电压利用范围。在限幅需求的基础上,结合典型低压谐波源特性,提出了最优限幅策略,设定补偿优先级,优先补偿主要频次谐波分量,并... 详细信息

本文详细分析了有源电力滤波器需要限幅输出的三种情况,即指令电流超出装置容量、IGBT结温过高、超出直流侧电压利用范围。在限幅需求的基础上,结合典型低压谐波源特性,提出了最优限幅策略,设定补偿优先级,优先补偿主要频次谐波分量,并进行了仿真分析。最后,搭建了65KVA三相三线APF实验平台,验证了所述方法的有效性。

关键词：有源电力滤波器限幅需求限幅实现补偿优先级最优限幅策略

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Real time 3D Hand Gesture Recognition by Weighted Depth Difference Motion History Image in Networked HCI

Real time 3D Hand Gesture Recognition by Weighted Depth Diff...

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第40届中国控制会议

作者： Haoyang Luo Haikuan Wang Wenju Zhou kangli liu Jinqi Fu School of Mechatronic Engineering and Automation Shanghai University Shanghai Key Laboratory of Power Station Automation Technology Shanghai University

Hand gesture recognition applied in human-computer interaction（HCI） is a useful but challenging task because of the low inter-class and high intra-class variability. It is difficult to improve real-time performance while ensuring accuracy. Since simple but robust features are crucial for the performance of recognition, we proposed the weighted depth difference motion history image（WDD-MHI） to extract spatial-temporal information. Subsequently, a weighted random forest classifier with second training is employed for action classification. The developed method is shown to be computationally efficient allowing it to run in real-time. We designed a multimedia video-wall control system based on online gesture recognition, the recognition results indicate competitive performance of our method over the other methods.

关键词： Hand gesture recognition human-computer interaction networked control 3D depth image

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The Emerging Role of Follistatin under Stresses and Its Implications in Diseases

The Emerging Role of Follistatin under Stresses and Its Impl...

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华东地区生物化学与分子生物学学会联合会2017年学术交流会暨安徽省生物化学与分子生物学学会理事会议

作者： Lingda Zhang kangli liu Bing Han Zhengping Xu Xiangwei Gao Institute of Environmental Medicine Zhejiang University School of Medicine

Follistatin(FST),a single-chain glycosylated protein,is expressed in various *** essential biological function of FST is binding and neutralizing transforming growth factor β(TGF-β) superfamily,including activin,myostatin,and bone morphogenetic protein(BMP).Emerging evidence indicates that follistatin also serves as a stress responsive protein,which plays a protective role under a variety of *** most cases,follistatin performs the protective function through its neutralization of TGF-β ***,under certain circumstances,FST translocates into the nucleus to maintain cellular homeostasis independent on its extracellular antagonism *** review provides integrated insight into the most recent advances in understanding the role of FST under various stresses,and the clinical implications corresponding to these findings and discusses on the mechanisms to be further studied.

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