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Surface-engineering of layered liNi_(0.815)Co_(0.15)Al_(0.035)O_2 cathode material for high-energy and stable li-ion batteries

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Journal of Energy Chemistry 2018年第2期27卷 559-564页

作者： Yugang li Haifeng Yu Yanjie Hu Hao Jiang chunzhong li Key Laboratory for Ultrafine Materials of Ministry of Education & School of Materials Science and Engineering East China University of Science and Technology

Surface engineering is an effective strategy to restrain the generation of rocksalt NiO phase on surface of layered liNi0.815Co0.15Al0.035O2（NCA） primary nanoparticles, a representative Ni-rich layered oxides cathode materials. Herein, we demonstrate the kilogram-scale synthesis of few-layer reduced graphene oxide（rGO） conformably coated NCA primary nanoparticles cathode materials by a mechanical wet ball-milling strategy. The lightening rGO coating layer effectively avoids the direct contact of electrolyte and NCA with rapid electrons transfer. As a result, the as-obtained NCA@rGO hybrids with only 1.0 wt% rGO content can deliver a high specific capacity（196 mAh g-1 at 0.2 C） and fast charge/discharge capability（127 mAh g-1 at 5 C）, which is much higher than the corresponding NCA nanoparticles（95 mAh g-1 at 5 C）. Even after100 cycles at 1 C, 91.7% of initial reversible capacity is still maintained. Furthermore, a prismatic pouch cell（240 mAh） is also successfully assembled with the commercial graphite anode.

关键词： Layered materials Cathode Reduced graphene oxide Energy density li-ion batteries

Comparative Study on Optical Properties and Scratch Resistance of Nanocomposite Coatings Incorporated with Flame Spray Pyrolyzed Silica Modified via in-situ Route and ex-situ Route

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Journal of Materials Science & Technology 2016年第3期32卷 251-258页

作者： Yun Wang ling Zhang Yanjie Hu chunzhong li Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology

A new type of transparent scratch resistant coatings including in-situ modified SiO2 （g-SiO2） in flame spray pyrolysis （FSP） process was prepared. The maximum content of g-SiO2 in the coating was 15 wt%, which is higher than that of SiO2 modified by traditional wet chemical route （I-SiO2, only 10 wt%）. The results of transmission electron microscopy have demonstrated that in-situ surface modified g-SiO2 particles dispersed well with smaller agglomerates in the final coating, which was much better than the particles modified via wet chemical route. Visible light transmittance and haze tests were introduced to characterize the optical quality of the films. All coatings were highly transparent with the visible light transmittance of above 80%, especially for coatings containing g-SiO2, which exhibited slightly higher visible light transmittance than l-SiO2 embedded one. The haze value of coatings incorporated with 15 wt% g-SiO2 was 1.85%, even lower than the coating with 5 wt% I-SiO2 （haze value of 2.09%）, indicating much better clarity of g-SiO2. The excellent optical property of g-SiO2 filled coatings was attributed to the good dispersion and distribution of particles. Nano-indention and nano-scratch tests were con- ducted to investigate the scratch resistance of coatings on nano-scale. The surface hardness of the coatings rose by 18% and 14%, and the average friction coefficient decreased by 15% and 11%, respectively, compared to the neat coat due to the addition of 10 wt% g-SiO2 and I-SiO2. The pencil hardness of the coating with 15 wt% g-SiO2 increased from 2B for the neat coating to 2H. However, the pencil hardness of coating with 10 wt% I-SiO2 was only H. The results showed that the g-SiO2 embedded coatings exhibited higher scratch resistance and better optical properties.

关键词： ln-situ modification Silica Coating Scratch resistance Optical property

Synthesis and sintering of indium tin oxide nanoparticles by citrate-nitrate combustion method

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Rare Metals 2010年第4期29卷 355-360页

作者： WANG Haiwen XU Xiujuan li Xiuhua ZHANG Jianrong li chunzhong Department of Chemistry Key Laboratory for Advanced Materials of the Ministry of Education of China East China University of Science and Technology Shanghai 200237 China Key Laboratory for Ultrafine Materials of the Ministry of Edueation of China East China University of Science and Technology Shanghai 200237 China

Spherical indium tin oxide （ITO） nanoparticles were synthesized by combustion method using citric acid as fuel and nitrates as oxidizer. The obtained ITO nanoparticles were characterized by TG-DSC, FT-IR, XRD, BET, TEM, and SEM. The ITO nanoparticles grew steadily with the increase of heat treatment temperature, and the 700~C calcined particles had a crystallite size of 25.3 nm and a specific surface area of 26.1 m2.g i The avoidance of chlorine ions in the synthesis process decreases particle agglomeration and promotes powder densification. The 900~C sintered pellet had a density of 67.6% of theoretical density （TD） and increased steadily to 97.3% for the 1400℃ sintered ceramics, respectively.

关键词： oxide materials ceramics sintering indium tin oxide

Photoelectrochemical glucose biosensor incorporating CdS nanoparticles

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Particuology 2009年第5期7卷 347-352页

作者： Jinjie Sun Yihua Zhu Xiaoling Yang chunzhong li Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Sdence and EngineeringEast China University of Science and Technology 130 Meilong Road. Shanghai 200237 China

A novel photoelectrochemical biosensor incorporating nanosized CdS semiconductor crystals with enzyme to enhance photochemical reaction has been investigated. CdS nanoparticles were synthesized by using dendrimer PAMAM as inner templates. The CdS nanoparticles and glucose oxidase （GOD） were immobilized on Pt electrode via layer-by-layer （LbL） technique to fabricate a biological-inorganic hybrid system. Under ultraviolet light, the photo-effect of the CdS nanoparticles showed enhancement of the biosensor to detect glucose. Pt nanoparticles were mixed into the Nation film to immobilize the CdS/enzyme composites and to improve the charge transfer of the hybrid. Experimental results demonstrate the desirable characteristics of this biosensing system, e,g. a sensitivity of 1.83 μA/（mM cm^2）, lower detection limit （1 μM）, and acceptable reproducibility and stability,

关键词： CdS nanoparticles PAMAM Photoelectrochemical Biosensor Glucose oxidase Layer-by-layer

A Cost-Effective Co-precipitation Method for Synthesizing Indium Tin Oxide Nanoparticles without Chlorine Contamination

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Journal of Materials Science & Technology 2010年第11期26卷 1037-1040页

作者： Haiwen Wang Xiujuan Xu Jianrong Zhang chunzhong li Department of Chemistry Key Laboratory for Advanced Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China Key Laboratory for Ultrafine Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China

Indium tin oxide （ITO） nanoparticles with crystallite size of 12.6 nm and specific surface area of 45.7 m 2 ·g-1 were synthesized by co-precipitation *** indium solution was obtained by dissolving metal indium in *** tin solution was obtained by dissolving metal tin in HNO3 and followed by stabilizing with citric *** free of chlorine ions in the synthesis process brought several advantages：shortening the synthesis time,decreasing the particle agglomeration,decreasing the chlorine content in the ITO nanoparticles and improving the particle *** is the first time to report the synthesis of ITO nanoparticles free from chlorine contamination without using the expensive metal alkoxides as starting materials.

关键词： Nanomaterials Powder technology Indium tin oxide Coprecipitation method

Patterned catalyst layer boosts the performance of proton exchange membrane fuel cells by optimizing water management

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Chinese Journal of Chemical Engineering 2022年第4期35卷 246-252页

作者： Yingjie Zhou Wenhui Zhang Shengwei Yu Haibo Jiang chunzhong li Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science&TechnologyShanghai 200237China

Mass transport is crucial to the performance of proton exchange membrane fuel cells,especially at high current ***,the oxygen and the generated water share same transmission medium but move towards opposite direction,which leads to serious mass transfer ***,a series of patterned catalyst layer were prepared with a simple one-step impressing method using nylon sieves as *** grooves 100μm in width and 8μm in depth on the surface of cathode catalyst layer,the maximum power density of fuel cell increases by 10%without any additional durability loss while maintaining a similar electrochemical surface *** concentration contours calculated by finite element analysis reveal that the grooves built on the surface of catalyst layer serve to accumulate the water nearby while oxygen tends to transfer through relatively convex region,which results from capillary pressure difference caused by the pore structure difference between the two *** separation of oxidant gas and generated water avoids mass confliction thus boosts mass transport efficiency.

关键词： Water management Mass transfer Patterned catalyst layer Proton exchange membrane fuel cells Finite element analysis

A sol-gel method to synthesize indium tin oxide nanoparticles

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Particuology 2011年第5期9卷 471-474页

作者： Xiuhua li Xiujuan Xu Xin Yin chunzhong li Jianrong Zhang Department of Chemistry Key LaboratoryforAdvanced Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China Key Laboratory for Ultrafine Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China

Transparent conductive indium tin oxide （ITO） nanoparticles were synthesized by a novel sol-gel method. Granulated indium and tin were dissolved in HNO3 and partially complexed with citric acid. A sol-gel process was induced when tertiary butyl alcohol was added dropwise to the above solution. ITO nanopartides with an average crystallite size of 18.5 nm and surface area of 32.6 m^2 ]g were obtained after the gel was heat-treated at 700 ℃, The ITO nanoparticles showed good sinterability, the starting sintering temperature decreased sharply to 900 ℃, and the 1400 ℃ sintered pellet had a density of 98.1% of theoretical density （TD）.

关键词： Oxide materials Ceramics Sintering Indium tin oxide

In situ Surface Functionalization of Hydrophilic Silica Nanoparticles via Flame Spray Process

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Journal of Materials Science & Technology 2015年第9期31卷 901-906页

Hydrophobic silica nanoparticles grafted with a high amount of organic molecules were successfully pre- pared by an in situ functionalization method in flame spray pyrolysis （FSP） process. Hydrophilic SiO2 nanoparticles were converted into hydrophobic ones by silylation between 3-methacryloxypropyltrimethoxyl silane （MPS） and silica＇s surface hydroxyl groups. The freshly formed silica nanoparticles in flame were continuously functionalized by a fine spray of 3-methacryloxypropyltrimethoxyl silane （MPS） solution at a preferred temperature. The functionalization extent, morphology structure and size of silica nanoparticles were characterized by transmission electron microscopy （TEM）, Brunauer-Emmett- Teller （BET）, thermogravimetric analysis （TGA）, Fourier transform infrared spectroscopy （FT-IR） and X-ray photoelectronic spectroscopy （XPS）. The influence of concentration, pH value and pre-activation of organic silane solution on the surface grafting density was investigated in detail. The obtained silica nanoparticles had a higher MPS functional content of 15.0 wt% （an average density of 2.7 MPS molecule/nm^2） than that of the silica modified by wet chemistry route, showing an excellent, stable hydrophobic property. The results have demonstrated that the in situ FSP functionalization process is a simple, effective and prom- ising route for the scalable preparation of advanced, hydrophobic nanomaterials.

关键词： SilicaIn situ functionalizationHydrophobicFlameModification

Large-scale synthesis of hollow titania spheres via flame combustion

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Particuology 2011年第6期9卷 632-636页

作者： Jie liu Yanjie Hu Feng Gu chunzhong li Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science ＆ Technology Shanghai 200237 China

A one-step method for continuous large-scale synthesis of well-defined hollow titania spheres was established by feeding titanium tetrachloride mixed with ethanol vapor to a facile diffusion flame. A mixture of TiCl4 and C2H5OH vapor was transported at 100 m/s into a flame reactor and condensed into mesoscale droplets due to Joule-Thomson cooling and the entrainment of cool gases into the expanding high-speed jet. Hollow crystalline TiO2 spheres with good thermal stability were formed after the hydrolysis of TiCl4 in the H2/air flame at about 1500℃. Structural characterization indicates that the hollow spheres, with uniform diameter of 300 nm and shell thickness of 35 rim, consist of 20-30 nm TiO2 nanocrystallites. A formation mechanism of the hollow spheres was proposed, involving the competition between chemical reaction and diffusion during the flame process. The present study provides a new pathway for continuous and large-scale engineering of hollow nanomaterials.

关键词： Flame combustion Hollow spheres Titania Formation mechanism Large-scale