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Tripotassium citrate monohydrate derived carbon nanosheets as a competent assistant to manganese dioxide with remarkable performance in the supercapacitor

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Frontiers of Chemical Science and Engineering 2022年第3期16卷 420-432页

作者： Wenjing Zhang Xiaoxue Yuan Xuehua Yan Mingyu You Hui Jiang Jieyu Miao Yanli Li Wending Zhou Yihan Zhu Xiaonong Cheng School of Materials Science and Engineering Jiangsu UniversityZhenjiang212013China Institute for Advanced Materials Jiangsu UniversityZhenjiang212013China

Production cost,capacitance,and electrode materials safety are the key factors to be concerned about for *** this work,a type of carbon nanosheets was produced through the carbonization of tripotassium citrate monohydrate and nitric ***,a well-designed manganese dioxide/carbon nanosheets composite was synthesized through hydrothermal *** carbon nanosheets served as the substrate for growing the manganese dioxide,regulating its distribution,and preventing it from inhomogeneous dimensions and severe *** manganese dioxide nanosheets grew vertically on the numerous functional groups generated on the surface of the carbon nanosheets during *** synergistic combination of carbon nanosheets and manganese dioxide tailors the electrochemical performance of the composite,which benefits from the excellent conductivity and stability of carbon *** carbon nanosheets derived from tripotassium citrate monohydrate are conducive to the remarkable performance of manganese dioxide/carbon nanosheets ***,an asymmetric supercapacitor with active carbon as the cathode and manganese dioxide/carbon nanosheets as the anode was assembled,achieving an outstanding energy density of 54.68 Wh·kg^(−1) and remarkable power density of 6399.2 W·kg^(−1) superior to conventional lead-acid *** 10000 charge-discharge cycles,the device retained 75.3%of the initial capacitance,showing good cycle *** assembled asymmetric supercapacitors in series charged for 3 min could power a yellow light emitting diode with an operating voltage of 2 V for 2 *** study may provide valuable insights for applying carbon materials and manganese dioxide in the energy storage field.

关键词： carbon nanosheets manganese dioxide asymmetric supercapacitors energy density power density

Large-scale multirole Zn(Ⅱ) programmed synthesis of ultrathin hierarchically porous carbon nanosheets

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Science China(Technological Sciences) 2020年第9期63卷 1730-1738页

作者： XU LingSong MENG FanCheng WEI XiangFeng LIN ChangHao ZHENG LianXi LIU JicHua Future Energy Laboratory School of Materials Science and EngineeringHefei University of TechnologyHefei230009China Department of Mechanical Engineering School of EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationKey Laboratory of Advanced Functional Materials and Devices of Anhui ProvinceHefei230009China

ZIF-derived carbon structures are considered as desired electrode materials for supercapacitors due to their high surface area,high conductivity, and porous structure. However, the most reported ratio of 2-methylimidazole and Zn(II) is 4:1 to 20:1, which limits commercial applications due to the increasing cost. In this paper, a multirole Zn(II)-assisted method is presented from Zn(II) solution, Zn O, Zn O/ZIF-8 core-shell nanostructure, to 3 D hierarchical micro-meso-macroporous carbon structures with a1:1 ratio of 2-methylimidazole and Zn(II). The hierarchically porous carbon has a high surface area of 1800 m2 g^(-1) due to the synergistic effect of multirole Zn(II). The unique carbon-based half-cell delivers the specific capacitances of 377 and 221 F g^(-1) at the current densities of 1.0 and 50 A g^(-1), respectively. As a 2.5 V symmetrical supercapacitor, the device reveals a high doublelayer capacitance of 24.4 F g^(-1), a power density of 62.5 k W kg^(-1), and more than 85.8% capacitance can be retained over 10000 cycles at 10 A g^(-1). More importantly, the low-cost hierarchically porous carbon could be easily produced on a large scale and almost all chemicals can be reused in the sustainable method.

关键词： multirole Zn(Ⅱ) hierarchically porous carbon N doping carbon nanosheets supercapacitor

CrN supported by carbon nanosheets as efficient catalysts toward oxygen reduction reaction and Zn-air batteries

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Rare Metals 2024年第10期43卷 4973-4981页

作者： Ya-Ting Zhang Fan Zhang Zhe Lu Jun-Ming Luo Su-Yang Feng Qi Wang Hui Chen Hao-Ming Wu Zheng-Pei Miao Bin Chi Neng Yu Cheng-Hang You Jing Li Xin-Long Tian School of Chemistry and Chemical Engineering School of Marine Science and EngineeringHainan Provincial Key Lab of Fine ChemistryHainan UniversityHaikou 570228China State Power Investment Group Hainan Electric Power Co.Ltd.Haikou 570100China Key Laboratory of Fuel Cell Technology of Guangdong Province Guangzhou 510641China Shenzhen Automotive Research Institute Beijing Institute of TechnologyShenzhen 518118China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China

Exploring non-precious efficient oxygen reduction reaction(ORR)catalysts is of great significance to fuel cells and Zn-air batteries(ZABs).CrN is a theoretically promising ORR catalyst,but its potential needs to be unlocked by proper supports that provide high conductivity and high exposure of active *** this work,we introduce a novel synthesis of carbon nanosheets-supported CrN nanoparticles(CrN/C)by annealing the mixture of CrCl_(3),1,10-phenanthroline and melamine via a two-step *** prepared CrN/C materials show good ORR activity and stability in acidic and alkaline *** optimal CrN/C material has an ORR half-wave potential of 0.73 and 0.72 V(*** hydrogen electrode)in acidic and alkaline media,*** it retains 82% and 78% of ORR current density in acidic and alkaline media after durability tests,***,the optimal CrN/C material-based self-breathing ZABs deliver a maximum power density of 168 mW·cm^(-2),which is one of the highest among transition metal nitrides-based ZABs It is found that the ORR activity of CrN/C materials is highly related to the Cr-N valence *** work highlights the good potential of CrN as robust ORR catalyst and verifies its promising application in ZABs.

关键词： Fuel cells Zn-air batteries Oxygen reduction reaction CrN carbon nanosheets

Cobalt-embedded few-layered carbon nanosheets toward enhanced hydrogen evolution:Rational design and insight into structure-performance correlation

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Journal of Energy Chemistry 2021年第7期30卷 156-161页

作者： Liwen Xing Hongyi Gao Dandan Jia Xiao Chen Mengyi Han Junjun Lv Ang Li Ge Wang Xingtian Shu Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology Beijing30 Xueyuan RoadBeijing 100083China Research Institute of Petroleum Processing SINOPECBeijing 100083China Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China School of Chemistry Biology and Materials Engineering Suzhou University of Science and TechnologySuzhou 215009JiangsuChina Shunde Graduate School University of Science and Technology BeijingFoshan 528399GuangdongChina

Over the past decades, the energy and concomitant environment issues, such as energy shortage, air pollution and global warming, have been becoming increasingly striking world-wide challenges [1,2]. Such a dilemma in ... 详细信息

关键词： Electrocatalyst Metal-organic frameworks carbon nanosheets Hydrogen evolution reaction Structure-performance correlation

Flame-assisted ultrafast synthesis of functionalized carbon nanosheets for high-performance sodium storage

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carbon Energy 2024年第7期6卷 123-133页

作者： Chen Chen Dong Yan Yew Von Lim Lei Liu Xue Liang Li Junjie Chen Tian Chen Li Youyu Zhu Jiangtao Cai Ying Huang Yating Zhang Hui Ying Yang School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'anChina Pillar of Engineering Product Development Singapore University of Technology and DesignSingaporeSingapore School of Electrical Engineering Xi'an University of TechnologyXi'anChina International Joint Laboratory of New Energy Materials and Devices of Henan Province School of Physics and ElectronicsHenan UniversityKaifengChina College of Chemistry and Chemical Engineering Xi'an University of Science and TechnologyXi'anChina

The unique structural features of hard carbon(HC)make it a promising anode candidate for sodium-ion batteries(SIB).However,traditional methods of preparing HC require special equipment,long reaction times,and large energy consumption,resulting in low throughputs and *** our contribution,a novel synthesis method is proposed,involving the formation of HC nanosheets(NS-CNs)within minutes by creating an anoxic environment through flame combustion and further introducing sulfur and nitrogen sources to achieve heteroatom *** effect of heterogeneous element doping on the microstructure of HC is quantitatively analyzed by high-resolution transmission electron microscopy and image processing *** with density functional theory calculation,it is verified that the functionalized HC exhibits stronger Na^(+)adsorption ability,electron gain ability,and Na^(+) migration *** a result,NS-CNs as SIB anodes provide an ultrahigh reversible capacity of 542.7mAh g^(-1) at 0.1Ag^(-1),and excellent rate performance with a reversible capacity of 236.4mAh g^(-1) at 2Ag^(-1) after 1200 ***,full cell assembled with NS-CNs as the can present 230mAh g^(-1) at 0.5Ag^(-1) after 150 ***,in/ex situ techniques confirm that the excellent sodium storage properties of NS-CNs are due to the construction of abundant active sites based on the novel synthesis method for realizing the reversible adsorption of Na^(+).This work provides a novel strategy to develop novel carbons and gives deep insights for the further investigation of facile preparation methods to develop high-performance carbon anodes for alkali-ion batteries.

关键词： carbon nanosheets heteroatom doping sodium-ion battery sustainable materials

Multifunctional Templating Strategy for Fabrication of Fe,N-Codoped Hierarchical Porous carbon nanosheets

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Chinese Journal of Polymer Science 2022年第1期40卷 2-6页

作者： Yu-heng Lu You-chen Tang Ru-liang Liu Chuan-fa Li Shao-hong Liu You-long Zhu Ding-cai Wu Key Laboratory for Polymeric Composite&Functional Materials of Ministry of Education School of ChemistrySun Yat-sen UniversityGuangzhou 510006China

Due to the unique physical and chemical merits including excellent electrical conductivity,superior chemical stability,and tunable carbon framework,two-dimensional(2 D)porous carbon nanosheets have drawn increasing research interest and demonstrated promising potentials in various ***,regulating the nanostructure of 2 D porous carbon nanosheets by facile and efficient strategies remains a great ***,we develop a new strategy to construct Fe,N-codoped hierarchical porous carbon nanosheets(Fe-N-HPCNS)by using 2 D Fe-Zn layered double hydroxides(Fe-Zn-LDH)as multifunctional ***-Zn-LDH could functionalize not only as 2 D structure directing agents but also as ternary hierarchical porogens for micro-,meso-and macropores and in situ Fe *** multifunctional templating strategy toward 2 D porous carbon nanosheets can improve the utilization of templates and shows great advantages against conventional procedures that additional porogens and/or dopants are often needed.

关键词： carbon nanosheets Multifunctional templates Hierarchical pores Heteroatom doping

Hierarchically porous, ultrathin N–doped carbon nanosheets embedded with highly dispersed cobalt nanoparticles as efficient sulfur host for stable lithium–sulfur batteries

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Journal of Energy Chemistry 2020年第11期29卷 106-114页

作者： Mengrui Wang Xunfu Zhou Xin Cai Hongqiang Wang Yueping Fang Xinhua Zhong College of Materials and Energy.South China Agricultural University Guangzhou 510642GuangdongChina Guangdong Laboratory for Lingnan Modem Agriculture South China Agricultural UniversityGuangzhou 510642GuangdongChina Guangxi Key Laboratory of Low carbon Energy Materials School of Chemistry&Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina

The sluggish redox kinetics and shuttle effect of soluble polysulfides intermediate primarily restrict the electrochemical performance of lithium–sulfur(Li–S) batteries. To address this issue, rational design of high–efficiency sulfur host is increasingly demanded to accelerate the polysulfides conversion during charge/discharge process. Herein, we propose a macro–mesoporous sulfur host(Co@NC), which comprises highly dispersed cobalt nanoparticles embedding in N–doped ultrathin carbon nanosheets. Co@NC is simply synthesized via a carbon nitride–derived pyrolysis approach. Owing to the highly conductive graphene–like matrix and well defined porous structure, the designed multifunctional Co@NC host enables rapid electron/ion transport, electrolyte penetration and effective sulfur trapping. More significantly,N heteroatoms and homogeneous Co nanocatalysts in the graphitic carbon nanosheets could serve as chemisorption sites as well as electrocatalytic centers for sulfur species. These Co–N active sites can synergistically facilitate the redox conversion kinetics and mitigate the shuttling of polysulfides, thus leading to improved electrochemical cycling performance of Li–S batteries. As a consequence, the S/Co@NC cathode demonstrates high initial specific capacity(1505 mA h g-1 at 0.1 C) and excellent cycling stability at 1 C over 300 cycles, giving rise to a capacity retention of 91.7% and an average capacity decline of 0.03%cycle-1.

关键词： Rechargeable lithium–sulfur batteries Sulfur host Shuttling effect carbon nanosheets Cobalt nanoparticles carbon nitride

Highly graphitized carbon nanosheets with embedded Ni nanocrystals as anode for Li-ion batteries

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Nano Research 2020年第1期13卷 86-94页

作者： Francisco Javier Soler-Piña Celia Hernández-Rentero Alvaro Caballero Julián Morales Enrique Rodríguez-Castellón Jesús Canales-Vázquez Dpto.Química Inorgánica e Ingeniería Química Instituto de Química Fina y NanoquímicaUniversidad de Córdoba14071CórdobaSpain Dpto.Química Inorgánica Cristalografía y MineralogíaFacultad de CienciasUniversidad de Málaga29071MálagaSpain Instituto de Energías Renovables Universidad de Castilla-La ManchaPaseo de La Investigación 102071AlbaceteSpain

A C/Ni composite was prepared via thermal decomposition of a nickel oleate complex at 700℃,yielding disperse Ni nanocrystals with an average size of 20 nm,encapsulated by carbon nanosheets as deduced from transmission electron microscopy(TEM)images and confirmed from X-ray photoelectron spectroscopy(XPS).Furthermore,the X-ray diffraction pattern revealed a good ordering of the carbon layers,forced by the Ni encapsulation to adopt a bending *** the close interaction between the graphitized framework and the metallic nanoparticles we have studied the properties of the composite as an anode for Li-ion *** with other nanostructured synthetic carbons,this carbon composite has a low voltage hysteresis and a modest irreversible capacity value,properties that play a significant role in its behaviour as electrodes in full cell *** moderate rate values,0.25 C,the electrode delivers an average capacity value around 723 mAh·g^−1 on cycling,among the highest values so far reported for this carbon *** higher rate values,1 C,the average capacity values delivered by the cell on cycling decrease,around 205 mAh·g^−1,but it maintains good capacity retention,a coulombic efficiency close to 100%after the first cycles and recovery of the capacity values when the rate is restored from 3 to 0.1 C.

关键词： carbon nanosheets nickel nanoparticles anode lithium batteries

Defect-rich and highly porous carbon nanosheets derived from Ti_(3)AlC_(2) MAX with good lithium storage properties

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Chinese Chemical Letters 2023年第2期34卷 618-622页

作者： Zhihao Zhu Peng Liu Yucheng Liu Xingxing Gu Zhi Su Zhong Su Chao Lai College of Chemistry and Chemical Engineering Xinjiang Normal UniversityUrumqi 830054China School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116China Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China National Research Base of Intelligent Manufacturing Service Chongqing Technology and Business UniversityChongqing 400067China

Defect-rich,highly porous two-dimensional carbon nanosheets(CNS) have attracted tremendous research interests in catalysis and environmental purification and other fields,because of their unique micromorphology,chemical stability and high specific surface ***,in this work,we report a new solution to synthesize an ultrathin two-dimensional CNS with rich defects and abundant pores via two-step etching the Ti_(3)AlC_(2)with the help of I2and *** CNS thickness,specific surface area and pore volume could be all tunable by adding the amount of *** the highest specific surface area and pore volume of the synthesized 2D CNS can be achieved 1134.4 m^(2)/g and 0.80 cm^(3)/g,with a thickness of only 0.64 nm and a yield of 35.9%.When employed as the anodes for lithium-ion batteries,the synthesized CNS anodes exhibit good cycling and rate *** work provides a novel and facile strategy for synthesizing highly porous and defective 2D carbon materials with good lithium storage properties.

关键词： Ti_(3)AlC_(2) Two-dimensional carbon nanosheets Rich defect High specific surface area