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A channel-confined strategy for synthesizing CoN-CoO_(x)/C as efficient oxygen reduction electrocatalyst for advanced zinc-air batteries

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Nano Research 2022年第3期15卷 2092-2103页

作者： Xingmei Guo Wei Zhang Jing Shi Mengting Duan Shanjing liu Junhao Zhang yuanjun liu Shenglin Xiong Qinghong Kong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of Colloid and Interface Chemistry Ministry of Educationand School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

Designing hybrid transition metal compounds with optimized electronic structure and firmly dispersing them on a matrix to avoid aggregation and shedding is of great significance for achieving high electrocatalytic ***,an adsorption-complexation-calcination strategy based on channel confining effect is explored to obtain CoN-CoO_(x)hybrid nanoparticles uniformly dispersed in mesoporous *** CoN-CoO_(x)/C composite exhibits excellent electrocatalytic behavior for oxygen reduction reaction(ORR).The half-wave potential and durability are comparable or superior to those of Pt/*** applying as cathode catalyst for a primary zinc-air battery,the open-circuit voltage and peak power density reach up to 1.394 V and 109.8 mW·cm^(−2),respectively.A high gravimetric energy density of 950.3 Wh·kgZn^(−1) is delivered at 10 mA·cm^(−2) with good rate capability and *** functional theory(DFT)calculation demonstrates the favorable ORR intermediate adsorbability and metallic characteristics of CoN grains with oxide hybridization to optimize the electronic *** work provides a facile adjustable approach for obtaining highly dispersed nanoparticles with controllable hybrid composition on a substrate,which is important for future design and optimization of high-performance electrocatalysts.

关键词： channel-confined complexation CoN-CoO_(x) mesoporous carbon oxygen reduction reaction zinc-air battery

FeCo-based hybrid MOF derived active species for effective oxygen evolution

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Progress in Natural Science:Materials International 2020年第2期30卷 185-191页

作者： yuanjun liu Cheng Wang Suxiao Ju Mo Li Aihua Yuan Guoxing Zhu School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Marine Equipment and Technology Institute Jiangsu University of Science and Technology School of Chemistry and Chemical Engineering Jiangsu University

Metal-organic frameworks（MOFs） have been regarded as promising catalyst materials due to the richness of coordinately unsaturated metal sites on the surface,which can act as catalytic active *** this study,a hybrid MOF material composed of Fe-based MOF and Co-based MOF was prepared with the involvement of graphene oxide nanosheets as *** was demonstrated that the hybrid MOF materials showed much higher electro-catalytic activity towards oxygen evolution than the single-phase *** drive current density of 10 mA cm;,the hybrid CoFe-based MOF only needed an over potential of 290 mV in 1 M *** catalytic activity could sustain for a longer time with only slight current density *** oxygen evolution operation,the MOF catalyst evolved into catalytic active species but kept well the microscale sheet-like *** is thus believed that this study will provide an avenue for the development of advanced electrocatalysts.

关键词： Metal-organic frameworks Oxygen evolution Cobalt Iron Electrocatalysts Water oxidation

Porous Fe-Mn-O nanocomposites:Synthesis and supercapacitor electrode application

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Progress in Natural Science:Materials International 2016年第3期26卷 264-270页

作者： Guoxing Zhu Jing Yang yuanjun liu Xulan Xie Zhenyuan Ji Jinxiu Yin Xiaoping Shen School of Chemistry and Chemical Engineering Jiangsu University State Key Laboratory of Coordination Chemistry Nanjing University School of Environmental and Chemical Engineering Jiangsu University of Science and Technology

Transition metal oxide micro-/nanostructures demonstrate high potential applications in energy storage devices. Here, we report a facile synthesis of highly homogeneous oxide composites with porous structure via a coordination polymer precursor, which was prepared with the assistance of tartaric *** typical product, Fe-Mn-O composite was demonstrated here. The obtained Fe-Mn-O product was systemically characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping analysis, and X-ray photoelectron spectroscopy. It was demonstrated that the Fe-Mn-O nanocomposite shows interconnected porous structure, in which iron,manganese, and oxygen are uniformly distributed. In addition, the Fe-Mn-O nanocomposite was then fabricated as capacitor electrodes. Operating in an aqueous neutral solution, the Fe-Mn-O composite electrodes showed an wide working potential window from 0.2 to 1.0 V(vs. SCE), and a specific capacitance of 86.7 Fg-1or 0.4 Fcm-2at a constant current density of 1 Ag-1with good cycle life. This study offers a new precursor approach to prepare porous metal oxide composites, which would be applied in energy-storage/conversion devices, catalysts, sensors, and so on.

关键词： Oxide Fe-Mn-O Porous structure Capacitors Electrodes

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

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Nano Research 2021年第10期14卷 3598-3607页

作者： Yanchun Xue Xingmei Guo Mengrong Wu Jiale Chen Mengting Duan Jing Shi Junhao Zhang Fu Cao yuanjun liu Qinghong Kong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

Developing suitable electrode materials for electrochemical energy storage devices by biomorph assisted design has become a fascinating topic due to the fantastic properties derived from ***,zephyranthes-like Co_(2)NiSe_(4)arrays grown on butterfly wings derived three-dimensional(3D)carbon framework(Z-Co_(2)NiSe_(4)/BWC)is fabricated via hydrothermal assembly and further conversion *** from its unique structure and multi-components,the obtained Z-Co_(2)NiSe_(4)/BWC electrode for supercapacitor delivers an excellent specific capacitance of 2,280 F·g^(-1)at 1 A·g^(-1).Impressively,the constructed asymmetric supercapacitor using Co_(2)NiSe_(4)/BWC as positive electrode and activated butterfly wings carbon as negative electrode acquires a high energy density of 42.9 Wh·kg^(-1)at a power density of 800 W·kg^(-1)with robust stability of 94.6%capacitance retention at 10 A·g^(-1)after 5,000 ***,the Z-Co_(2)NiSe_(4)/BWC as anode for sodium-ion batteries exhibits a high specific capacity of 568 mAh·g^(-1)at 0.1 A·g^(-1)and high cycling stability(maintaining 80.1%of the second cycle after 100 cycles).The outstanding electrochemical performances are ascribed to that the synergistic effect of bimetallic selenides and N-doped carbon improves electrochemical activities and ***-dimensional(1D)nanoneedles grown on 3D porous framework increase the exposure of redox-active sites,endow adequate transmission channels of electrons/ions,and guarantee stability of the electrode during charge/discharge *** study will shed light on the avenue towards extending such nanohybrids to excellent energy storage applications.

关键词： Co_(2)NiSe_(4) three-dimensional(3D)carbon framework synergistic effect supercapacitors sodium-ion batteries

Fabricating titanium dioxide/N-doped carbon nanofibers as advanced interlayer for improving cycling reversibility of lithium-sulfur batteries

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Chinese Journal of Chemical Engineering 2022年第12期52卷 88-94页

作者： Xingmei Guo Jinfeng Xie Jing Wang Shangqing Sun Feng Zhang Fu Cao yuanjun liu Xiangjun Zheng Junhao Zhang Qinghong Kong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

"Shuttle effect" is detrimental for maintaining the high capacity and cycling reversibility of lithium-sulfur batteries(LSBs).To inhibit polysulfide migration,N-doped carbon nanofibers(N-CNFs) membrane comprising TiO_(2)nanoparticles(TiO_(2)/N-CNFs) is fabricated using an electrospinning-calcination method and further applied as interlayer in *** TiO_(2)/N-CNFs interlayer helps the battery to deliver a high specific capacity of 1155.2 mA·h·g^(-1)at 0.2 C with high Coulombic efficiency,good rate capability and *** cycling at 0.5 C,a capacity retention rate of 62.4% is achieved over 300 cycles,which is higher than that of CNFs and TiO_(2)/CNFs *** excellent performance should mainly be attributed to the alleviated "shuttle effect" deriving from high polysulfide trapping ability of TiO_(2)nanoparticles and N heteroatoms in interwoven CNFs.

关键词： TiO_(2)/N-CNFs interlayer Composites Microstructure Adsorption Lithium-sulfur battery Shuttle effect

Controllable fabrication of FeCoS_(4) nanoparticles/S-doped bowl-shaped hollow carbon as efficient lithium storage anode

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Chinese Journal of Chemical Engineering 2024年第3期67卷 78-88页

作者： Ming Zhou Mengrong Wu Haiwei Yu Xiangjun Zheng Kuan Shen Xingmei Guo yuanjun liu Fu Cao Hongxing Gu Qinghong Kong Junhao Zhang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Jiangsu Hengshen Co. LtdZhenjiang 212314China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

To address the low conductivity and easy agglomeration of transition metal sulfide nanoparticles,FeCoS_(4) nanoparticles embedded in S-doped hollow carbon(FeCoS_(4)@S-HC)composites were successfully fabricated through a combination of hydrothermal processes and sulfidation *** unique bowlshaped FeCoS_(4)/S-HC composites exhibit excellent structural stability with a high specific surface area of 303.7 m^(2)·g^(-1) and a pore volume of 0.93 cm^(3)·g^(-1).When applied as anode material for lithium-ion batteries,the FeCoS_(4)@S-HC anode exhibits efficient lithium storage with high reversible specific capacity(970.2 mA·h·g^(-1) at 100 mA·g^(-1))and enhanced cycling stability(574 mA·h·g^(-1) at 0.2 A·g^(-1) after 350 cycles,a capacity retention of 84%).The excellent lithium storage is attributed to the fact that the bimetallic FeCoS_(4) nanoparticles with abundant active sites can accelerate the electrochemical reaction kinetics,and the bowl-shaped S-HC structure can provide a stable mechanical structure to suppress volume expansion.

关键词： Bimetallic sulfides Bowl-shaped hollow carbon S doping Buffering volume expand Lithium-ion batteries

F127 assisted fabrication of Ge/r GO/CNTs nanocomposites with three-dimensional network structure for efficient lithium storage

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Chinese Chemical Letters 2024年第9期35卷 447-451页

作者： Hui Gu Mingyue Gao Kuan Shen Tianli Zhang Junhao Zhang Xiangjun Zheng Xingmei Guo yuanjun liu Fu Cao Hongxing Gu Qinghong Kong Shenglin Xiong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of the Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJi’nan 250100China Jiangsu Hengshen Co. Ltd.Zhenjiang 212314China School of the Environment and Safety engineering Jiangsu UniversityZhenjiang 212013China

To solve the volume expansion and poor electrical conductivity of germanium-based anode materials,Ge/rGO/CNTs nanocomposites with three-dimensional network structure are fabricated through the dispersion of polyethylene-polypropylene glycol(F127)and reduction of *** interesting phenomenon is discovered that F127 can break GeO_(2)polycrystalline microparticles into 100 nm nanoparticles by only physical interaction,which promotes the uniform dispersion of GeO_(2)in a carbon network structure composed of graphene(rGO)and carbon nanotubes(CNTs).As evaluated as anode material of Lithium-ion batteries,Ge/rGO/CNTs nanocomposites exhibit excellent lithium storage *** initial specific capacity is high to 1549.7 mAh/g at 0.2 A/g,and the reversible capacity still retains972.4 mAh/g after 100 *** improved lithium storage performance is attributed to that Ge nanoparticles can effectively slow down the volume expansion during charge and discharge processes,and threedimensional carbon networks can improve electrical conductivity and accelerate lithium-ion transfer of anode materials.

关键词： F127 assisted fabrication Ge/rGO/CNTs nanocomposites Three-dimensional carbon network Lithium-ion batteries Cycle stability

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岩石类材料裂纹扩展贯通的颗粒流模拟

岩石力学与工程学报 2012年第A01期31卷 3123-3129页

作者：杨庆刘元俊大连理工大学土木工程学院辽宁大连116024 大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

采用颗粒流软件PFC2D实现含有不同岩桥倾角的预制双裂纹材料在单轴压缩作用下裂纹扩展贯通过程,并利用函数模块追踪裂纹扩展过程和微裂纹数量。数值结果表明:在单轴压缩作用下随着岩桥倾角增大,岩桥区域裂纹贯通模式由张拉型(≤68°)逐... 详细信息

采用颗粒流软件PFC2D实现含有不同岩桥倾角的预制双裂纹材料在单轴压缩作用下裂纹扩展贯通过程,并利用函数模块追踪裂纹扩展过程和微裂纹数量。数值结果表明:在单轴压缩作用下随着岩桥倾角增大,岩桥区域裂纹贯通模式由张拉型(≤68°)逐渐演化为拉剪复合型(=90°和113°)和剪切型(=135°);试件峰值强度逐渐降低;并认为宏观的次生剪切带主要由张拉型微裂纹和少量剪切型微裂纹组成。利用室内模型试验对数值结果进行验证,结果表明颗粒流程序能够很好地模拟裂纹贯通过程。

关键词：岩石力学岩石类材料颗粒流方法翼裂纹岩桥裂纹贯通

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公共借阅权制度的实然与应然

图书与情报 2010年第5期 57-59,88页

作者：刘元珺武汉大学信息管理学院湖北武汉430072

文章试图重新审视公共借阅权制度在各国的实施状况和设置初衷;循欧盟委员会之行动来勾勒其设想的公共借阅权制度,指出公共借阅权预设前提的可疑性,建议从利益平衡角度来评价公共借阅权问题,同时也讨论了我国实行公共借阅权制度的可行性。

关键词：公共借阅权制度实然应然

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