搜索结果: 16-30 共查到“知识库 电化学工程”相关记录1582条 . 查询时间(1.953 秒)
针对电动汽车换电站电池冗余度和充电成本过高的问题,基于边缘计算建立了电动汽车换电电池冗余度分析模型。结合边缘计算与云计算技术,建立电动汽车换电电池冗余度分析的边缘计算平台,利用边缘节点A采集电动汽车用电信息,并将采集数据上传至云平台。云平台利用电动汽车换电电池充电优化控制模型,分析边缘节点B关联电动汽车换电电池冗余度;利用自适应遗传算法求解模型,实现电动汽车换电电池的充电优化。实验结果表明,该模型...
通过阳极和阴极两侧的废气再循环可以实现低电流密度下的电压钳位以及无需外部加湿器的自加湿。基于氮气渗漏和水扩散动态系统仿真模型,提出了一种控制阴阳两极气体压力平衡和限电压的控制算法,并对控制算法进行了仿真分析和有效性验证。试验结果表明阴极循环系统动态性能良好,并能够把氢燃料电池在低电流密度下的单片电压控制在0.85 V以下。通过正交试验发现,进气阀开度和循环泵的转速是实现电压快速控制最重要的影响因素...
PEMFC新型压差流道传质与电化学性能研究
质子交换膜燃料电池（PEMFC） 压差流道 流道宽度 功率密度
2024/3/11
双极板是质子交换膜燃料电池PEMFC（proton exchange membrane fuel cell）核心组件,极板的流道形状和尺寸直接影响反应气体的利用率以及电池的排水、散热性能。基于极板工作原理提出一种新型PEMFC压差流道构型,研究流道内阴极氧气浓度、水浓度分布、进出口压降、流速的变化,分析电流密度和极化曲线对燃料电池电化学性能的影响;在50%开孔率时,通过对比8组低压直流道和高压直流...
软包锂离子电池由许多电池单元叠压形成,其中电池单元的电和热行为对电池的整体安全性有很大的影响。为了研究电池单元与单体之间的关系,采用多孔电极理论建立了大容量软包锂电池的分层多维模型,并考虑了瞬态温度变化与电化学反应间的相互作用关系。利用该分层模型研究不同温度下电池放电过程中的电化学和热特性,得到更为真实的电池温度场分布。此外,介绍了表征电池单体内不同电池单元荷电状态分布的均匀指数。仿真表明,电池单...
Fe3O4 quantum dots embedded in porous carbon microspheres for long-life lithium-ion batteries
Ions Iron oxides Magnetite Micelles Microspheres
2023/6/21
We report here Fe 3 O 4 quantum dots embedded Fe 3 O 4 @C electrode materials via a facile micelle-colloid template method for pushing forward the Li-ion battery technology. To improve uniform dispers...
为改善电催化活性和亲水性,作者对商业碳黑(BP2000)进行了酸处理,获得了酸处理碳(ATC).通过X光电子能谱、红外光谱、热重和接触角测试的表征方法证明了酸处理在碳表面产生了丰富的含氧基团.本文首次利用紫外可见光谱测试了碱性条件抗坏血酸(AA)在空气中的化学氧化活化能,结果为37.1 kJ·mol~(-1).另外,利用交流阻抗谱对碱性条件下ATC作为电催化剂时AA的氧化反应的活化能进行了评价.碱...
Revealing the effect of aluminum content on the electrochemical performance of magnesium anodes for aqueous batteries
aluminum content discharge potential Mg-Al alloy anodes utilization efficiency
2023/6/21
Al is one of the principal alloying elements for Mg anodes. In this study, a series of Mg-Al alloys has been evaluated as anode materials for optimizing the Al addition amount in Mg anodes with the in...
Uniform Pd0.33Ir0.67 nanoparticles supported on nitrogen-doped carbon with remarkable activity toward the alkaline hydrogen oxidation reaction
Alkalinity Anodes Binary alloys Carbon Cyclic voltammetry Density functional theory
2023/6/21
Highly efficient non-Pt electrocatalysts for the alkaline hydrogen oxidation reaction (HOR) are required to enable complete replacement of Pt in hydroxide exchange membrane fuel cells (HEMFCs). Herein...
以七水合硫酸锌(ZnSO4?7H2O)和六亚甲基四胺(HMT)为原料,采用化学浴沉积法合成了碱式硫酸锌(ZSH)微米片,并将其作为填料嵌入氟碳(FC)清漆中.采用傅里叶变换红外光谱仪、场发射扫描电镜、能谱仪和X射线衍射仪分析了ZSH微米片的健结构、形貌和组分.对比了不同ZSH的质量分数时在紫铜上所得FC–ZSH复合涂层的剖面结构、ZSH分布情况及腐蚀防护性能.结果表明,所得ZSH呈典型的六方片状晶...
Controlled Preparation of MgAl-Layered Double Hydroxide/Graphene Hybrids and Their Applications for Metal Protection
MgAl-Layered Double Hydroxide Graphene Hybrids
2023/6/21
The ion-conductive nature of layered double hydroxides (LDHs) and poor dispersibility of graphene are considered to be vital problems that limit their applications in the field of metal protection. Th...
The role of graphene loading on the corrosion-promotion activity of graphene/epoxy nanocomposite coatings
Graphene Polymer-matrix composites Coatings Corrosion
2023/6/21
It is still arguable whether graphene/polymer nanocomposite coating is corrosion inhibitors or promoters. This work aims to determine the "percolation threshold" for corrosion-promotion activity of th...
Partially dehydrated zinc hydroxide sulfate nanoplates reinforced coating for corrosion protection
Zinc hydroxide sulfate Dehydration Crystal phase transition Active barrier Synergistic effect
2023/6/21
In this work, partially dehydrated zinc hydroxide sulfate nanoplates are synthesized by facile chemical bath deposition together with subsequent heat dehydration. The nanoplates exhibit well-defined h...
非氟聚合物磺化聚芳醚砜酮(SPPESK)具有甲醇渗透率低、化学、热稳定性高等优点,但其高的电导率需通过提高磺化度获得,导致膜因过度溶胀而失去尺寸稳定性.添加无机纳米颗粒可以有效提高膜性能,但因其表面缺少功能化基团,导致颗粒有机相容性差,阻醇性能和质子传导率不易同时提高.硫酸化改性的纳米颗粒因其表面具有酸性位点和硫酸基团,能够有效克服这一问题.本文制备表面硫酸化改性的SnO2(SSnO2)纳米颗粒并...
Machine learning-based atom contribution method for the prediction of surface charge density profiles and solvent design
atom contribution computer-aided molecular design decomposition-based algorithm machine learning
2023/6/19
Solvents are widely used in chemical processes. The use of efficient model-based solvent selection techniques is an option worth considering for rapid identification of candidates with better economic...