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Spherical FeF3·0.33H2O/MWCNTs nanocomposite with mesoporous structure as cathode material of sodium ion battery

Journal of Energy Chemistry 2018年第2期27卷 573-581页

作者： Shuangying Wei Xianyou Wang Min Liu Rui Zhang Gang Wang Hai Hu National Bose for International Science & Technology Cooperation Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangton University Xiangtan 411105Hunan China

FeF3·0.33H2O crystallizes in hexagonal tungsten bronze structure with more opened hexagonal cavities are considered as next generation electrode materials of both lithium ion battery and sodium ion *** this paper the mesoporous spherical FeF3·0.33H2O/MWCNTs nanocomposite was successfully synthesized via a one-step solvothermal approach. Galvanostatic measurement showed that the performances of sodium ion batteries（SIBs） using FeF3·0.33H2O/MWCNTs as cathode material were highly dependent on the morphology and size of the as-prepared materials. Benefitting from the special mesoporous structure features, FeF3·0.33H2O/MWCNTs nanocomposite exhibits much better electrochemical performances in terms of initial discharge capacity（350.4 mAh g-1） and cycle performance（123.5 mAh g-1 after 50 cycles at 0.1 C range from 1.0 V to 4.0 V） as well as rate capacity（123.8 mAh g-1 after 25 cycles back to 0.1 C）. The excellent electrochemical performance enhancement can be attributed to the synergistic effect of the mesoporous structure and the MWCNTs conductive network, which can effectively increase the contact area between the active materials and the electrolyte, shorten the Na＋ diffusion pathway,buffer the volume change during cycling/discharge process and improve the structure stability of the FeF3·0.33H2O/MWCNTs nanocomposite.

关键词： Sodium ion batteries Cathode material Spherical nanoparticles mesoporous structure Conductive network

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Rapid Fabrication of CdS Nanocrystals with Well mesoporous structure Under Ultrasound Irradiation at Room Temperature

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Chemical Research in Chinese Universities 2012年第1期28卷 124-128页

作者： YU Chang-lin1, ZHOU Wan-qin2,3, YU Jim-my4, YANG Jian-gao5 and FAN Qi-zhe1 1. School of Metallurgy and Chemical Engineering, 2. School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, P. R. China 3. Fujian Provincial Key Laboratory of Photocatalysis-State Key Laboratory Breeding Base, Fuzhou University, Fuzhou 350002, P. R. China 4. Department of Chemistry, Center of Novel Functional Molecules, and Environmental Science Programme, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, P. R. China 5. Engineering Research Center of High-efficiency Development and Application Technology of Tungsten Resources, Ministry of Education, Jiangxi University of Science and Technology, Ganzhou 341000, P. R. China Jiangxi Univ Sci & Technol Sch Met & Chem Engn Ganzhou 341000 Peoples R China Jiangxi Univ Sci & Technol Sch Informat Engn Ganzhou 341000 Peoples R China Fuzhou Univ Fujian Prov Key Lab Photocatalysis State Key Lab Breeding Base Fuzhou 350002 Peoples R China Chinese Univ Hong Kong Dept Chem Ctr Novel Funct Mol Shatin Hong Kong Peoples R China Chinese Univ Hong Kong Environm Sci Programme Shatin Hong Kong Peoples R China Jiangxi Univ Sci & Technol Minist Educ Engn Res Ctr High Efficiency Dev & Applicat Techn Ganzhou 341000 Peoples R China

Sphere-like mesoporous CdS nanocrystals with high crystallinity and big surface area were successfully fabricated by ultrasound irradiation at room temperature. The as-synthesized CdS with and without ultrasound irra diation was investigated by the characterizations of X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, and Brunauer-Emmett-Teller（BET） surface areas. The photocatalytic acti vity of the CdS was evaluated by photocatalytic degradation of methyl orange under visible light（λ〉420 nm） irradia tion. A possible mechanism for the formation of the CdS nanocrystals with mesoporous structure under ultrasound irradiation was proposed. The results show that both the template role of the triblock copolymer of P123 and the effect of ultrasound-induced aggregation are mainly responsible for the formation of mesoporous structure. On the other hand, the energy generated from acoustic cavitation can effectively accelerate the crystallization process of the amorphous CdS.

关键词： CdS Crystallinity mesoporous structure Ultrasound-induced aggregation

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Fabrication of Fe-doped Co-MOF with mesoporous structure for the optimization of supercapacitor performances

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Chinese Chemical Letters 2018年第6期29卷 834-836页

作者： Huanan Yu Huicong Xia Jianan Zhang Jing He Shiyu Guo Qun Xu College of Materials Science and Engineering Zhengzhou University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

The synergy effect between different components has attracted widespread attentions because of improved activity, selectivity and stability than single component. In this paper, we fabricated mesoporous hybrid dual-metal Co and Fe containing metallic organic framework（Co/Fe-MOF）, Fe-MOF,and Co-MOF in the ionic liquid（IL）/supercritical CO2（SC）/surfactant emulsion system, and then studied the electrochemical properties of the three MOFs systematically. Experiment results indicate that, by taking advantages of coexistence of double metal, hybrid bi-metal Co/Fe-MOF exhibits the highest specific capacitance and the best cycling stability, with specific capacitance to 319.5 F/g at 1 A/g, 1.4 and 4 times for single Co-MOF and Fe-MOF, respectively.

关键词： Metallic organic framework mesoporous structure Synergistic effect Hybrid dual-metal Supercapacitor

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Effect of cetyltrimethylammonium bromide on morphology and porous structure of mesoporous hydroxyapatite

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Transactions of Nonferrous Metals Society of China 2015年第2期25卷 483-489页

作者：王晶黄苏萍胡堃周科朝孙虹中南大学粉末冶金国家重点实验室长沙410083 中南大学湘雅医院耳鼻喉头颈外科长沙410008

The mesoporous hydroxyapatite （HA） was synthesized by hydrothermal method utilizing cationic surfactant cetyltrimethylammonium bromide （CTAB） as template. The crystalline phase, morphology and porous structure were characterized respectively by different detecting techniques. The results reveal that the particles are highly crystalline hydroxyapatite phase. The surfactant has little influence on the morphology of the crystals, but affects the porous structure obviously. The sample without CTAB has a low surface area not exceeding 33 m^2/g, and no distinct pores can be observed by TEM. While the samples obtained with the surfactant get better parameters. Numerous open-ended pores centered at 2-7 nm spread unequally on the surface of the hydroxyapatite nanorods. The N2 adsorption-desorption experiments show type IV isotherms with distinct hysteresis loops, illustrating the presence of mesoporous structure. When the mole ratio of CTAB to HA is 1：2, the sample has the largest surface area of 97.1 m^2/g and pore volume of 0.466 cm^3/g.

关键词： hydroxyapatite cetyltrimethylammonium bromide cationic surfactant soft-template mesoporous structure

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Non-spherical abrasives with ordered mesoporous structures for chemical mechanical polishing

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Science China Materials 2021年第11期64卷 2747-2763页

作者： Peili Gao Tingting Liu Zhenyu Zhang Fanning Meng Run-Ping Ye Jian Liu Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China DICP-Surrey Joint Centre for Future Materials Department of Chemical and Process Engineeringand Advanced Technology InstituteUniversity of SurreySurrey GU27XHUnited Kingdom

The chemical mechanical polishing(CMP)technology has been widely used for surface modification of critical materials and components with high quality and *** a typical CMP process,the mechanical properties of abrasives play a vital role in obtaining the ultra-precision and damage-free surface of wafers for improvement of their *** this work,a series of fine structured rod-shaped silica(RmSiO2)-based abrasives with controllable sizes and diverse ordered mesoporous structures were synthesized via a soft template approach,and successfully applied in the sustainable polishing slurry for improving the surface quality of cadmium zinc telluride(CZT)*** with commercial silica gel,solid and mesoporous silica spheres,the RmSiO2 abrasives present superior elastic deformation capacity and surface precision machinability on account of their mesoporous structures and rod ***,ultra-precision surface roughness and relatively effective material removal speed were achieved by the CMP process using the RmSiO2 abrasives with a length/diameter(L/d)ratio of *** addition,a potential CMP mechanism of the developed polishing slurry to CZT wafer was elucidated by analyzing X-ray photoelectron spectra and other *** proposed interfacial chemical and mechanical effects will provide a new strategy for improving abrasives’machinability and precision manufacture of hard-to-machine materials.

关键词： non-spherical abrasives mesoporous structure chemical mechanical polishing interfacial mechanochemistry

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Pt–Pd bimetallic nanoparticles anchored on uniform mesoporous MnO_(2) sphere as an advanced nanocatalyst for highly efficient toluene oxidation

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Green Energy & Environment 2022年第6期7卷 1349-1360页

作者： Jiaqin He Dongyun Chen Najun Li Qingfeng Xu Hua Li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

Improving catalytic performance is a yet still challenge in thermal catalytic ***,uniform mesoporous MnO_(2) nanospheresupported bimetallic Pt–Pd nanoparticles were successfully fabricated via a SiO_(2) template strategy for the total catalytic degradation of volatile organic compounds at low *** introduction of mesopores into the MnO_(2) support induces a large specific surface area and pore size,thus providing numerous accessible active sites and enhanced diffusion ***,the addition of a secondary noble metal can adjust the O_(ads)/O_(latt) molar ratios,resulting in high catalytic *** them,the catalyst having a Pt/Pd molar ratio of 7:3 exhibits optimized catalytic activity at a weight hourly space velocity of 36,000 mL g^(-1) h^(-1),reaching 100%toluene oxidation at 175℃ with a lower activation energy(57.0 kJ mol^(-1))than the corresponding monometallic Pt or non-Pt-based catalysts(93.8 kJ mol^(-1) and 214.2 kJ mol^(-1)).Our findings demonstrate that the uniform mesoporous MnO_(2) nanosphere-supported bimetallic Pt–Pd nanoparticles catalyst is an effective candidate for application in elimination of toluene.

关键词： MnO_(2)nanospheres mesoporous structure Pt-Pd bimetal VOCs oxidation

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Synergy of mesoporous SnO_(2)and RbF modification for high-efficiency and stable perovskite solar cells

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Journal of Energy Chemistry 2022年第3期31卷 250-259,I0008页

作者： Qian Chen Changtao Peng Lin Du Tian Hou Wenjing Yu Dong Chen Hui Shu Dejun Huang Xiangqing Zhou Jinyang Zhang Wenfeng Zhang Haijin Li Jiale Xie Yuelong Huang Institute of Photovoltaic Southwest Petroleum UniversityChengdu 610500SichuanChina

Electron transport layer(ETL)is very critical to the performance of perovskite solar cells(PSCs),and optimization work on ETL has received extensive attentions especially on tin oxide(SnO_(2))since it is an excellent ETL material widely applied in high-efficiency ***,introducing mesoporous structure and surface modification are two important approaches which are commonly ***,based on the previous work in low-temperature fabrication process of mesoporous SnO_(2)(mSnO_(2)),we introduced a modification process with rubidium fuoride(Rb F)to the m-SnO_(2)ETL,and successfully achieved a synergy of the m-SnO_(2)and Rb F modification:not only the shortcoming of the m-SnO_(2)in interfacial traps was overcome,but also the carrier collection efficiency was further *** PSCs based on the m-SnO_(2)ETL with Rb F modification demonstrated outstanding performances:a champion power conversion efficiency(PCE)of 22.72%and a stability performance of maintaining 90%of the initial PCE after 300 h of MPP tracking were obtained without surface passivation of perovskite ***,utilizing the abovementioned synergy is a cost-effective and feasible strategy for fabricating high-efficiency and stable PSCs since the fabrication process of the m-SnO_(2)ETL is a kind of low temperature process and RbF is cheap.

关键词： Tin oxide mesoporous structure Rubidium fuoride Perovskite solar cells

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Atomic iron on mesoporous N-doped carbon to achieve dehydrogenation reaction at room temperature

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Nano Research 2020年第11期13卷 3075-3081页

作者： Zheng Chen Wenjuan Yang Yue Wu Chao Zhang Jun Luo Chen Chen Yadong Li Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Key Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu241000China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China Department of Chemistry Tsinghua UniversityBeijing100084China View author publications Center for Electron Microscopy Tianjin University of TechnologyTianjin300384China

Atomic non-noble metal materials show the potential to substitute noble metals in ***,melamine formaldehyde resin is developed to synthesize atomic iron on mesoporous nitrogen-doped *** triazine units with abundant nitrogen content and cavity can realize effectively anchoring of single metal *** atomic iron with unique charge and coordination characteristics shows superior catalytic performance in dehydrogenation *** N-heterocycles compounds and amines can be efficiently dehydrogenated into the corresponding products at room temperature,which is the mildest of all reported reaction conditions even when noble metal catalysts are ***,development of atomic non-noble metal catalysts with mesoporous structure may provide an effective way to realize the substitution for noble metals in heterogeneous catalysis.

关键词： atomic dispersion non-noble metal nitrogen-doped carbon mesoporous structure dehydrogenation

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Vapor deposition of aluminium oxide into N-rich mesoporous carbon framework as a reversible sulfur host for lithium-sulfur battery cathode

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Nano Research 2021年第1期14卷 131-138页

作者： Fei Sun Zhibin Qu Hua Wang Xiaoyan Liu Tong Pei Rui Han Jihui Gao Guangbo Zhao Yunfeng Lu School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Chemistry Shanghai Normal UniversityShanghai 150001China Department of Chemical and Biomolecular Engineering University of CaliforniaLos AngelesCA 90095USA

Restraining the shuttle effects of lithium polysulfides is the key to improve the cycling reversibility and stability of lithium-sulfur(Li-S)batteries for which design of robust sulfur hosts has been regarded as the most effective *** this work,we report a new type of hybrid sulfur host which is composed of Al_(2)O_(3) homogenously decorated in nitrogen-rich mesoporous carbon framework(NMC-Al_(2)O_(3)).The NMC-Al_(2)O_(3) hybrid host features a poly-dispersed spherical morphology and a mesoporous configuration with high surface area and large pore volume that can accommodate a high sulfur content up to 73.5 wt.%.As a result,the fabricated NMC-Al_(2)O_(3)-S cathode exhibits all-round improvements in electrochemical properties in term of capacities(1,212 mAh·g^(-1)at 0.2 C;755 mAh·g^(-1)at 2 C),cycling charge-discharge reversibility(sustainably 100%efficiencies)and stability(1,000 cycles with only 0.023%capacity decay per cycle at 0.5 C).By contrast,the Al_(2)O_(3)-free NMC-S cathode shows both decreased capacities and rapidly descending Coulombic efficiencies during *** functional theory(DFH")calculations further reveal that the implanted Al_(2)O_(3) can greatly enhance the chemical adsorption and catalytic conversion for various lithium polysulfides and thereby effectively prevent the polysulfide shuttling and significantly improve the utilizability,reversibility and stability of sulfur cathode.

关键词： lithium-sulfur battery aluminium oxide sulfur host nitrogen-rich carbon mesoporous structure

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Atomically dispersed Fe sites on hierarchically porous carbon nanoplates for oxygen reduction reaction

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Journal of Energy Chemistry 2024年第3期90卷 7-15,I0002页

作者： Ruixue Zheng Qinglei Meng Hao Zhang Teng Li Di Yang Li Zhang Xiaolong Jia Changpeng Liu Jianbing Zhu Xiaozheng Duan Meiling Xiao Wei Xing State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Laboratory of Advanced Power Sources Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123JiangsuChina State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina

Developing cost-effective,robust and stable non-precious metal catalysts for oxygen reduction reaction(ORR) is of paramount importance for electrochemical energy conversion devices such as fuel cells and metal-air *** Fe-N-C single atom catalysts(SACs) have been hailed as the most promising candidate due to the optimal binding strength of ORR intermediates on the Fe-N_(4) sites,they suffer from serious mass transport limitations as microporous templates/substrates,i.e.,zeolitic imidazolate frameworks(ZIFs),are usually employed to host the active *** by this challenge,we herein develop a hydrogen-bonded organic framework(HOF)-assisted pyrolysis strategy to construct hierarchical micro/mesoporous carbon nanoplates for the deposition of atomically dispersed Fe-N_(4) *** a design is accomplished by employing HOF nanoplates assembled from 2-aminoterephthalic acid(NH_(2)-BDC) and p-phenylenediamine(PDA) as both soft templates and C,N *** from the structural merits inherited from HOF templates,the optimized catalyst(denoted as Fe-N-C SAC-950) displays outstanding ORR activity with a high half-wave potential of 0.895 V(*** hydrogen electrode(RHE)) and a small overpotential of 356 mV at 10 mA cm^(-2) for the oxygen evolution reaction(OER).More excitingly,its application potential is further verified by delivering superb rechargeability and cycling stability with a nearly unfading charge-discharge gap of 0.72 V after 160 *** dynamics(MD) simulations reveal that micro/mesoporous structure is conducive to the rapid mass transfer of O_(2),thus enhancing the ORR *** situ Raman results further indicate that the conversion of O_(2) to~*O_(2)-the rate-determining step(RDS) for Fe-N-C *** work will provide a versatile strategy to construct single atom catalysts with desirable catalytic properties.

关键词： Fe single atom catalysts Oxygen reduction reaction mesoporous structure Active sites Zinc-air battery

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