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Rational synthesis of carbon shell coated polyaniline/ MoS2 monolayer composites for high-performance supercapacitors

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Nano Research 2016年第4期9卷 951-962页

作者： Chao Yang Zhongxin Chen Imran Shakir Yuxi Xu Hongbin Lu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Collaborative Innovation Center of Polymers and Polymer Composite Materials Fudan University Shanghai 200433 China Sustainable Energy Technologies (SET) center College of Engineering King Saud University PO-BOX 800 Riyadh 11421 Kingdom of Saudi Arabia

Conducting polymers generally show high specific capacitance but suffer from poor rate capability and rapid capacitance decary which greatly limits their practical applications in supercapacitor electrodes. To this end, many studies have focused on improving the overall capacitive performance by synthesizing nanostructured conducting polymers or by depositing a range of coatings to increase the active surface area exposed to the electrolyte and enhance the charge transport efficiency and structural stability. Despite this, simultaneously achieving high specific capacitance, good rate performance, and long cycle life remains a considerable challenge. Among the various two-dimensional （2D） layered materials, octahedral （1T） phase molybdenum disulfide （MoS2） nano- sheets have high electrical conductivity, large specific surface areas, and unique surface chemical characteristics, making them an interesting substrate for the controlled growth of nanostructured conducting polymers. This paper reports the rational synthesis of carbon shell-coated polyaniline （PANI） grown on 1T MoS2 monolayers （MoS2/PANI@C）. The composite electrode comprised of MoS2/ PANI@C with a -3 nm carbon shell exhibited a remarkable specific capacitance of up to 678 F-g-1 （1 mV.s-1）, superior capacity retention of 80% after 10,000 cycles and good rate performance （81% at 10 mV.s-1） due to the multiple synergic effects between the PANI nanostructure and 1T MoS2 substrates as well as protection by the uniform thin carbon shell. These properties are comparable to the best overall capacitive performance achieved for conducting polymers-based supercapacitor electrodes reported thus far.

关键词： supercapadtor polyaniline molybdenum disulfide carbon shell cycle stability

Dissolution-regrowth synthesis of SiO_2 nanoplates and embedment into two carbon shells for enhanced lithium-ion storage

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Chinese Journal of Chemical Engineering 2018年第7期26卷 1522-1527页

作者： Zhijun Yan Xiangcun Li Xiaobin Jiang Le Zhang Yan Dai Gaohong He State Key Laboratory of Fine Chemicals Chemical Engineering Department Dalian University of Technology

In this work, SiO2 nanoplates with opened macroporous structure on carbon layer （C-mSiO2） have been obtained by dissolving and subsequent ingrowing the outer solid SiO2 layer of the aerosol-based C-SiO2 double-shell hollow spheres. Subsequently, triple-shell C-mSiO2-C hollow spheres were successfully prepared after coating the C- mSiO2 templates by the carbon layer from the carbonization of sucrose. When being applied as the anode material fur lithium-ion batteries, the C-mSiO2-C triple-shell hollow spheres deliver a high capacity of 501 mA. h.g- 1 after 100 cycles at 500 mA.g-1 （based on the total mass of silica and the two carbon shells）, which is higher than those of C-mSiO2 （391 mA.h.g 1） spheres with an outer porous SiO2 layer, C-SiO2-C （370 mA-h.g-1） hollow spheres with a middle solid Si02 layer, and C-SiO2 （319.8 mA·h-g-1） spheres with an outer solid SiO2 layer. In addition, the battery still delivers a high capacity of 403 mA· h· g- 1 at a current density of 1000 mA· g- 1 after 400 cycles. The good electrochemical performance can be attributed to the high surface area （246.7 m2·g- 1 ） and pore volume （0.441 cm3· g-1） of the anode materials, as well as the unique structure of the outer and inner carbon layer which not only enhances electrical conductivity, structural stability, but buffers volume change of the intermediate SiO2 layer during repeated charge-discharge processes. Furthermore, the SiO2 nanoplates with opened macroporous structure facilitate the electrolyte transport and electrochemical reaction.

关键词： Silica nanoplates carbon shell Macroporous Lithium-ion battery

Antipoisoning catalysts for the selective oxygen reduction reaction at the interface between metal nanoparticles and the electrolyte

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carbon Energy 2023年第7期5卷 57-69页

作者： Sourabh S.Chougule A.Anto Jeffery Sreya Roy Chowdhury Jiho Min Yunjin Kim Keonwoo Ko Bathinapatla Sravani Namgee Jung Graduate School of Energy Science and Technology(GEST) Chungnam National UniversityYuseong-guDaejeonRepublic of Korea

One of the primary challenges in relation to phosphoric acid fuel cells is catalyst poisoning by phosphate anions that occurs at the interface between metal nanoparticles and the *** strong adsorption of phosphate anions on the catalyst surface limits the active sites for the oxygen reduction reaction(ORR),significantly deteriorating fuel cell ***,antipoisoning catalysts consisting of Pt-based nanoparticles encapsulated in an ultrathin carbon shell that can be used as a molecular sieve layer are rationally *** pore structure of the carbon shells is systematically regulated at the atomic level by high-temperature gas treatment,allowing O_(2) molecules to selectively react on the active sites of the metal nanoparticles through the molecular ***,the carbon shell,as a protective layer,effectively prevents metal dissolution from the catalyst during a long-term ***,the defect-controlled carbon shell leads to outstanding ORR activity and durability of the hybrid catalyst even in phosphoric acid electrolytes.

关键词： carbon shell catalyst poisoning effect molecular sieve effect oxygen reduction reaction phosphate anions phosphoric acid fuel cells

Microstructure controlled synthesis of Ni,N-codoped CoP/carbon fiber hybrids with improving reaction kinetics for superior sodium storage

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Journal of Materials Science & Technology 2022年第4期99卷 184-192页

作者： Huijun Li Xiaomin Wang Zhenxin Zhao Rajesh Pathak Siyue Hao Xiaoming Qiu Qiquan Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of New Energy Materials and Devices Taiyuan University of TechnologyTaiyuan 030024China Department of Electrical Engineering and Computer Science Center for Advanced Photovoltaics and Sustainable EnergySouth Dakota State UniversityBrookingsSD 57007USA Mechanical&Aerospace Engineering Syracuse UniversitySyracuseNY 13244USA

Transition-metal phosphides(TMPs)-based hybrid structure have received considerable attention for efficient sodium storage owing to their high capacity and decent ***,the volume expansion&the poor electronic conductivity of TMPs,the poor-rate capability,and fast capacity decay greatly hinder its practical *** address these issues,a low-cost and facile strategy for the synthesis of Ni,N-codoped graphitized carbon(C)and cobalt phosphide(CoP)embedded in carbon fiber(Ni-CoP@CN⊂CF)as self-supporting anode material is demonstrated for the first *** graphitized carbon and carbon fiber improve the electrical conductivity and inhibit the volume expansion *** addition to that,the microporous structure,and ultrasmall sized Ni-CoP offer a high surface area for electrolyte wettability,short Na-ion diffusion path and fast charge transport *** a result,outstanding electrochemical performance with an average capacity decay of 0.04%cycle^(−1)at 2000 mA g^(−1),an excellent rate capability of 270 mAh g^(−1)@2000 mA g^(−1)and a high energy density of~231.1 Wh kg^(−1)is achieved with binder-free self-supporting anode *** work shows a potential for designing binder-free and high energy density sodium-ion batteries.

关键词： Ultrasmall Ni-CoP carbon shell Microporous structure High Na^(+)diffusion coefficients Sodium-ion batteries

Pomegranate micro/nano hierarchical plasma structure for superior microwave absorption

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Nano Research 2022年第10期15卷 8688-8696页

作者： Chunyan Ding Tao Wu Xinsen Hu Chengshuai Shao Zhipeng Xu Hui Fu Songsong Wu Guangwu Wen Xiaoxiao Huang School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Shandong Industrial Ceramics Research&Design Institute Co. Ltd.Zibo 255000China Shandong Institute of Advanced Ceramic Co. Ltd.Zibo 255000China

Inspired by the pomegranate natural artful structure,pomegranate micro/nano hierarchical plasma configuration of Fe/Fe3C@graphitized carbon(FFC/pCL)was constructed based on the green sol-gel method and in-situ chemical vapor deposition(CVD)synthesis ***-like FFC/pCL successfully overcame the agglomeration phenomenon of magnetic nanoparticles with each seed of the pomegranate consisting of Fe/Fe_(3)C as cores and graphitized carbon layers as *** high-density arrangement of magnetic nanoparticles and the design of pomegranate-like heterostructures lead to enhanced plasmon ***,the pomegranate-like FFC/pCL achieved a great electromagnetic wave(EMW)absorbing performance of 6.12 GHz wide band absorption at a low mass adding of only 16.7 wt.%.Such excellent EMW performance can be attributed to its unique pomegranate hierarchical plasma configuration with separated nanoscale iron cores,surface porous texture,and good carbon conductive *** investigation provides a new paradigm for the development of magnetic/carbon based EMW absorbing materials by taking advantage of pomegranate hierarchical plasma configuration.

关键词： electromagnetic wave absorption low filler loading carbon shell network structure magnetic Fe/Fe3C

Synthesis of carbon-coated magnetic nanocomposite(Fe_3O_4@C) and its application for sulfonamide antibiotics removal from water

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Journal of Environmental Sciences 2014年第5期26卷 962-969页

作者： Xiaolei Bao Zhimin Qiang Jih-Hsing Chang Weiwei Ben Jiuhui Qu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences State Environmental Protection Engineering Center for Pharmacy Wastewater Pollution Control Hebei Provincial Environmental Scientific Research Department of Environmental Engineering and Management Chaoyang University of Technology

The occurrence of antibiotics in the environment has recently raised serious concerns regarding their potential threat to human health and aquatic ecosystem. A new magnetic nanocomposite, Fe304@C （Fe304 coated with carbon）, was synthesized, characterized, and then applied to remove five commonly-used sulfonamides （SAs） from water. Due to its combinational merits of the outer functionalized carbon shell and the inner magnetite core, Fe3O4@C exhibited a high adsorption affinity for selected SAs and a fast magnetic separability. The adsorption kinetics of SAs on Fe304 @ C could be expressed by the pseudo second-order model. The adsorption isotherms were fitted well with the Dual-mode model, revealing that the adsorption process consisted of an initial partitioning stage and a subsequent hole-filling stage. Solution pH exerted a strong impact on the adsorption process with the maximum removal efficiencies （74% to 96%） obtained at pH 4.8 for all selected SAs. Electrostatic force and hydrogen bonding were two major driving forces for adsorption, and electron-donor-acceptor interactions may also make a certain contribution. Because the synthesized Fe304@C showed comprehensive advantages of high adsorptivity, fast magnetic separability, and prominent reusability, it has potential applications in water treatment.

关键词： magnetic nanocomposite carbon shell sulfonamides adsorption water

One-step constructing advanced N-doped carbon@metal nitride as ultra-stable electrocatalysts via urea plasma under room temperature

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Chinese Chemical Letters 2024年第11期35卷 486-491页

作者： Tao Tang Chen Li Sipu Li Zhong Qiu Tianqi Yang Beirong Ye Shaojun Shi Chunyang Wu Feng Cao Xinhui Xia Minghua Chen Xinqi Liang Xinping He Xin Liu Yongqi Zhang Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 611731China Department of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China College of Materials Science&Engineering Zhejiang University of TechnologyHangzhou 310014China School of Chemistry and Materials Engineering Changshu Institute of TechnologyChangshu 215500China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 611731China Department of Engineering Technology Huzhou CollegeHuzhou 313000China Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

Highly active transition metal nitrides are desirable for electrocatalytic reactions,but their long-term stability is still unsatisfactory and thus limiting commercial ***,for the first time,we report a unique and universal room-temperature urea plasma method for controllable synthesis of N-doped carbon coated metal(Fe,Co,Ni,etc.)nitrides arrays *** preformed metal oxides arrays can be successfully converted into metal nitrides arrays with preserved nanostructures and a thin layer of N-doped carbon(N-C)via one-step urea ***,as a representative case,N-C@CoN nanowire arrays are illustrated and corresponding formation mechanism by plasma is ***,the designed N-C@Co N catalysts deliver excellent electrocatalytic activity and long-term stability both in oxygen evolution reaction(OER)and urea oxidation reaction(UOR).For OER,a low overpotential(264 mV at 10 mA/cm^(2))and high stability(>50 h at 20 mA/cm^(2))are *** UOR,a current density of100 m A/cm^(2) is achieved at only 1.39 V and maintain over 100 *** calculations reveal that the synergetic coupling effect of CoN and N-C can significantly facilitate the charge-transfer process,optimize adsorbed intermediates binding strength and further greatly decrease the energy *** strategy provides a novel method for fabrication of N-C@metal nitrides as highly active and stable catalysts.

关键词： Urea plasma Metal nitrides carbon shell Oxygen evolution reaction Urea oxidation reaction

Achieving effective broadband microwave absorption with Fe_(3)O_(4)@C supraparticles

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Journal of Materiomics 2021年第1期7卷 80-88页

作者： Li Su Jiaxin Ma Fangzhou Zhang Yuchi Fan Wei Luo Lianjun Wang Wan Jiang Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Institute of Functional Materials Donghua UniversityShanghai201620China

The X band(8 GHz-12 GHz)is the electromagnetic wave band emitted by most electronic instruments in our life,which will cause electromagnetic pollution harm to human *** to the coexistence of magnetic loss and dielectric loss,the modified Fe_(3)O_(4)-carbon-based nanomaterial exhibit strong electromagnetic(EM)wave absorptive ***,there is a problem that the effective absorption bandwidth(EAB,the frequency bandwidth of reflection loss is less than-10 dB)of the X band is *** the EAB value of Fe_(3)O_(4)-carbon-based materials is of great significance for reducing electromagnetic ***,an emulsion-based self-assembly technique and ligand carbonization treatment have been used to construct the Fe_(3)O_(4)@C supraparticles for the evaluation of EM *** Fe_(3)O_(4)@C supraparticles exhibit excellent EM absorption properties,which can achieve full coverage of X band from 6.52 GHz to 12.9 GHz at a sample thickness of 3 ***,the optimum EAB value of Fe_(3)O_(4)@C supraparticles is up to 8.55 GHz from 9 to 18 GHz at a sample thickness of 2.5 *** Fe_(3)O_(4)@C supraparticles with superlattice structure will have potential development prospects in the application of broadband absorption.

关键词： Fe_(3)O_(4)nanoparticles carbon shell Suparparticles Self-assembly Microwave absorption

Continuous high-temperature rapid nanomanufacturing of electrocatalysts

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Nano Research 2024年第1期18卷 225-235页

作者： Xiaoyang Wang Ziyi Luo Baihua Cui Ziqi Fu Yanchang Liu Weidi Liu Jia Ding Jianrong Zeng Yanan Chen Wenbin Hu 1School of Materials Science and Engineering Tianjin University Tianjin 300350 China 2Australian Institute for Bioengineering and Nanotechnology The University of Queensland St. Lucia Brisbane 4072 Australia 4Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China 3Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China

Encapsulating metal nanoparticles in carbon shells (Metal@C) to enhance catalytic activity and stability has been certified feasible. However, most existing methods for preparing Metal@C are complex, time-consuming, and lack of scalability. In this study, a novel method that couples the high-temperature shock (HTS) with ultrasonic spray pyrolysis is reported, which can realize facile and scalable production of various Metal@C through the pyrolysis of glucose and metal chloride mixtures. The proposed HTS ultrasonic spray pyrolysis offers several advantages, including compact size, short reaction time (~ 120 ms), and uniform heating. Taking the Ni@C-40 nanocomposite as an example, the ultrasmall Ni nanoparticles (~ 10 nm) with thin carbon protective shells (~ 2 nm) are uniformly dispersed in the carbon matrix and applied for oxygen evolution reaction (OER) in alkaline media. The Ni@C-40 optimized by tuning the thickness of carbon shell exhibits significantly enhanced OER activity with low overpotential of 242 mV at 10 mA·cm−2 and stability, which is attributed to the optimized interactions between Ni nanoparticles and carbon shells. This method also shows promise for continuous pyrolysis synthesis of various extreme materials at ultra-high temperatures using alternative electric heating materials.

关键词： ultrasonic spray pyrolysis high-temperature shock carbon shell oxygen evolution reaction Metal@C nanocomposite