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Multi-objective steady-state optimization of two-chamber microbial fuel cells

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Chinese Journal of Chemical Engineering 2017年第8期25卷 1000-1012页

作者： Ke Yang Yijun He zifeng ma Shanghai Electrochemical Energy Devices Research Center Department of Chemical Engineering Shanghai Jiao Tong University

A microbial fuel cell(MFC)is a novel promising technology for simultaneous renewable electricity generation and wastewater *** non-comparable objectives,*** density,attainable current density and waste removal ratio,are often conflicting.A thorough understanding of the relationship among these three conflicting objectives can be greatly helpful to assist in optimal operation of MFC *** this study,a multiobjective genetic algorithm is used to simultaneously maximizing power density,attainable current density and waste removal ratio based on a mathematical model for an acetate two-chamber ***,the level diagrams method is utilized to aid in graphical visualization of Pareto front and decision *** biobjective optimization problems and one three-objective optimization problem are thoroughly *** obtained Pareto fronts illustrate the complex relationships among these three objectives,which is helpful for final decision ***,the integrated methodology of a multi-objective genetic algorithm and a graphical visualization technique provides a promising tool for the optimal operation of MFCs by simultaneously considering multiple conflicting objectives.

关键词： Microbial fuel cell Multi-objective optimization Genetic algorithm Level diagrams Pareto front

Process modeling of fuel cell vehicle power system

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Chinese Science Bulletin 2009年第6期54卷 972-977页

作者： CHEN LiMing LIN ZhaoJia ma zifeng Institute of Electrochemical & Energy Technology Chemical Engineering Department Shanghai Jiao Tong University Shanghai 200240 China

Constructed here is a mathematic model of PEM Fuel Cell Vehicle Power System which is composed of fuel supply model, fuel cell stack model and water-heat management model. The model was developed by matlab/Simulink to evaluate how the major operating variables affect the output performances. It shows that the constructed model can represent characteristics of the power system closely by com-paring modeling results with experimental data, and it can be used in the study and design of fuel cell vehicle power system.

关键词：质子交换膜燃料电池汽车动力系统过程建模 Simulink 数学模型 matlab 燃料电池堆供应模式

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环己酮生产装置热能综合利用

河南化工 2024年第8期41卷 44-45页

作者：余跃平朱宏志马子峰河南首恒新材料有限公司河南许昌461000 河南平煤神马尼龙工程技术有限公司河南平顶山467000

针对环己酮生产装置脱氢反应器出料经两次换热后温度高,冷却水消耗大,干燥塔再沸器蒸汽消耗大问题,采用反应器出口换热后的物料与干燥塔进料进行第三次换热技术改造方案。改造后既降低了反应器冷却水的用量,也节约了干燥塔蒸汽用量,取... 详细信息

针对环己酮生产装置脱氢反应器出料经两次换热后温度高,冷却水消耗大,干燥塔再沸器蒸汽消耗大问题,采用反应器出口换热后的物料与干燥塔进料进行第三次换热技术改造方案。改造后既降低了反应器冷却水的用量,也节约了干燥塔蒸汽用量,取得了较好的经济效益。

关键词：环己酮脱氢反应器干燥塔换热

Preparation and performance of LiNi_(0.8)Co_(0.2)O_2 cathode material based on Co-substituted α–Ni(OH)_2 precursor

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Chinese Science Bulletin 2008年第9期53卷 1324-1328页

作者： HE YuShi PEI Li LIAO XiaoZhen ma zifeng Department of Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China

Co-substituted α-Ni(OH)2 was synthesized by a novel microwave homogeneous precipitation method in the presence of urea. LiNi0.8Co0.2O2 cathode material was synthesized by calcining Co-substituted α-Ni(OH)2 precursor and LiOH·H2O at 900℃ for 10 h in flowing oxygen. XRD, FTIR, FESEM and electro- chemical tests were used to study the physical and the electrochemical performances of the materials. The results show that the prepared LiNi0.8Co0.2O2 compound has a good layered hexagonal structure. Moreover, the LiNi0.8Co0.2O2 cathode material demonstrates stable cyclability with a high initial specific discharge capacity of 183.9 mah/g. The good electrochemical performance could be attributed to the uniform distribution of Ni2+ and Co2+ ions in the crystal structure and a minimal cation mixing in LiNi0.8Co0.2O2 host structure.

关键词：锂离子电池微波相似性降解方法钴氢氧化镍

Preparation of electrolyte membranes for micro tubular solid oxide fuel cells

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Science China Chemistry 2008年第9期51卷 808-812页

作者： TAN XiaoYao YIN WeiNing MENG Bo MENG XiuXia YANG NaiTao ma zifeng School of Chemical Engineering Shandong University of TechnologyZibo 255049China Department of Chemical Engineering Shanghai Jiaotong UniversityShanghai 200240China

Yttria-stabilized zirconia (YSZ) micro tubular electrolyte membranes for solid oxide fuel cells (SOFCs) were prepared via the combined wet phase inversion and sintering technique. The as-derived YSZ mi- cro tubes consist of a thin dense skin layer and a thick porous layer that can serve as the electrode of fuel cells. The dense and the porous electrolyte layers have the thickness of 3-5 μm and 70-90 μm, respectively, while the inner surface porosity of the porous layer is higher than 28.1%. The two layers are perfectly integrated together to preclude the crack or flake of electrolyte film from the electrode. The presented method possesses distinct advantages such as technological simplicity, low cost and high reliability, and thus provides a new route for the preparation of micro tubular SOFCs.

关键词： solid oxide fuel cell micro tube yttrium stabilized zirconia (YSZ) phase inversion

Scalable synthesis of Na_(3)V_(2)(PO_(4))_(3)/C with high safety and ultrahigh-rate performance for sodium-ion batteries

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Chinese Journal of Chemical Engineering 2022年第6期35卷 280-286页

作者： Guijia Cui Hong Wang Fengping Yu Haiying Che Xiaozhen Liao Linsen Li Weimin Yang zifeng ma Department of Chemical Engineering Shanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghai 200240China SINOPEC Shanghai Research Institute of Petrochemical Technology Shanghai 201208China Zhejiang NaTRIUM Energy Co.Ltd. Shaoxing 312000China

NASICON-type Na_(3)V_(2)(PO_(4))_(3) is a promising electrode material for developing advanced sodium-ion *** Na_(3)V_(2)(PO_(4))_(3) with good performance by a cost-effective and large-scale method is significant for industrial *** this work,a porous Na_(3)V_(2)(PO_(4))_(3)/C cathode material with excellent electrochemical performance is successfully prepared by an agar-gel combined with freeze-drying *** Na_(3)V_(2)(PO_(4))_(3)/C cathode displayed specific capacities of 113.4 mah·g^(-1),107.0 mah·g^(-1) and 87.1 mah·g^(-1) at 0.1 C,1 C and 10 C,*** the first time,the 500-mah soft-packed symmetrical sodium-ion batteries based on Na_(3)V_(2)(PO_(4))_(3)/C electrodes are successfully *** 500-mah symmetrical batteries exhibit outstanding low temperature performance with a capacity retention of 83%at 0℃ owing to the rapid sodium ion migration ability and structural stability of Na_(3)V_(2)(PO_(4))_(3)/***,the thermal runaway features are revealed by accelerating rate calorimetry(ARC)test for the first *** stability and safety of the symmetrical batteries are demonstrated to be better than lithium-ion batteries and some reported sodium-ion *** work makes it clear that the soft-packed symmetrical sodium ion batteries based on Na_(3)V_(2)(PO_(4))_(3)/C have a prospect of practical application in high safety requirement fields.

关键词： Na_(3)V_(2)(PO_(4))_(3)/C Sodium-ion batteries Symmetrical battery Accelerating rate calorimetry Battery thermal safety

Synthesis of Li_4Ti_5O_(12) nanostructural anode materials with high charge–discharge capability

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Chinese Science Bulletin 2014年第18期59卷 2162-2174页

作者： Ru Wen Jeffrey Yue zifeng ma Wuming Chen Xuchuan Jiang Aibing Yu School of materials Science and Engineering University of New South WalesSydneyNSW 2052Australia School of Chemistry and Chemical Engineering Shanghai Jiao Tong University

This study demonstrates a facile and efficient hydrothermal method to prepare spindle titanate(Li4Ti5O12 denoted as LTO)and/or carbon-LTO nanocomposites(CLTO),in which the LTO or C-LTO microspheres have diameters of a few micrometers,composed of numerous nanosheets with thickness of*30 nm and edge length of hundreds of *** morphology and size control of these nanoparticles could be achieved by varying experimental parameters including concentration of titanium butoxide,lithium hydroxide,and cetyltrimethylammonium bromide,as well as reaction temperature and *** micro-nanostructures were characterized by several advanced techniques,such as transmission electron microscopy,scanning electron microscopy,X-ray diffraction,energy dispersive spectroscopic analysis,surface area,and electrochemical *** LTO and C-LTO microstructures were examined in the charge–discharge capacity at a rate of 50 C,as well as the stability after 100 cycles at a rate of 10 *** excellent capability may be attributed to good conductivity,large surface area,and stable assembly structure of such micro-nanostructures,which could be explored as a promising anode material for lithium-ion batteries.

关键词：微纳米结构钛酸锂放电能力负极材料十六烷基三甲基铵透射电子显微镜合成纳米复合材料

Enhanced low-temperature performance of slight Mn-substituted LiFePO_4/C cathode for lithium ion batteries

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Chinese Science Bulletin 2011年第12期56卷 1262-1266页

作者： ZENG LingJie GONG Qiang LIAO XiaoZhen HE Li HE YuShi ma zifeng Department of Chemical Engineering Institute of Electrochemical & Energy Technology Shanghai Jiao Tong University Shanghai 200240China

Low temperature performance of LiFePO4/C cathode was remarkably improved by slight Mn-substitution. Electrochemical measurements showed that about 95% of the discharge capacity of LiFe0.98Mn0.02PO4/C cathode at 20°C was obtained at 0°C, compared to 85% of that of LiFePO4/C cathode. The LiFe0.98Mn0.02PO4/C sample also presented enhanced rate performance at –20°C with the discharge capacities of 124.4 ma h/g (0.1C), 99.8 ma h/g (1C), 80.7mah/g (2C) and 70 ma h/g (5C), respectively, while pristine LiFePO4/C only delivered capacities of 120.5 ma h/g (0.1C), 90.7 ma h/g (1C), 70.4 ma h/g (2C) and 52.2 ma h/g (5C). Cyclic voltammetry measurements demonstrated an obvious improvement of the lithium insertion-extraction process of the LiFePO4/C cathode by slight Mn-substitution. The results of FSEM observation and electrical conductivity measurement indicated that slight Mn-substitution minimized the particle size of LiFe0.98Mn0.02PO4/C and also obviously improved the electrical conductivity of the compound, thus obviously enhances the interface reaction process on the cathode.

关键词：磷酸铁锂低温性能电池正极锰取代锂离子 LiFePO4 放电容量电化学测量

A novel Co(phen)_2/C catalyst for the oxygen electrode in rechargeable lithium air batteries

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Chinese Science Bulletin 2012年第16期57卷 1959-1963页

作者： WANG Hong LIAO XiaoZhen JIANG QiZhong YANG XiaoWei HE YuShi ma zifeng Institute of Electrochemical and Energy Technology Department of Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

A novel Co(phen)2/C catalyst was prepared by coating cobalt(II) phenanthroline (phen) chelate on BP2000 carbon black and then heat treating in an inert atmosphere. The obtained Co(phen)2/C product with 1.0 wt% cobalt loading exhibits similar morphology and porosity characteristics to those of the bare BP2000. X-ray diffraction measurements demonstrate a face-centered cubic (fcc) α-Co phase embedded in the carbon support after pyrolysis. Charge/discharge tests of the lithium-oxygen cells using the prepared Co(phen)2/C catalyst show high discharge capacities of 4870 mah g-1 (0.05 ma cm-2 ), 3353 mah g-1 (0.1 ma cm-2 ) and 3220 mah g 1 (0.15 ma cm-2 ), respectively. The Co(phen) 2 /C cathode exhibits reasonable reversibility with capacity retention of 1401 mah g-1 ( 0.1 ma cm-2 ) after 10 cycles. The superior electrochemical performance of the prepared Co(phen)2/C catalyst and low cost of the phenanthroline chelating agent indicate that Co(phen)2/C is a promising cheap catalyst for lithium-air batteries.

关键词：催化剂制备 phen 空气电池氧电极可充电合作锂邻菲罗啉