PEMFC电催化剂研究进展

介绍了质子交换膜燃料电池用电催化剂的研究进展.论述了Pt-Ru、Pt-Sn、Pt-W、Pt-Mo等阳极催化剂以及Pt-Fe、Pt-Co、Pt-Cr等阴极催化剂的制备方法、催化机理和性能;介绍了无铂大环螯合物和过渡金属复合氧化物等非铂系催化剂和碳纳米管等新型载体催化剂的研究进展,提出了PEMFC用催化剂的研究方向.     

聚合物电解质燃料电池研究进展

综述了聚合物电解质燃料电池（PEMFC）的研究进展，讨论了PEMFC的五个主要研究问题，比较、分析了Nafion、聚苯并咪唑（PBI）膜和其他质子交换膜性能。最后，对质子交换膜的研究提供了意见。     

质子交换膜燃料电池的研究开发及应用新进展

介绍了国内外研究质子交换膜燃料电池的整体现状及水平 ,从电催化剂、膜电极及其制备工艺、质子交换膜以及双极板等几个方面 ,综述了质子交换膜燃料电池在材料及部件方面取得的成绩及研究现状 ,概述了质子交换膜燃料电池目前在电动车、船舶、移动电源等方面的应用情况。提出了我国质子交换膜燃料电池的发展方向     

质子交换膜燃料电池的0℃以下耐受性

车用质子交换膜燃料电池(PEMFC)应具备环境适应性,但水-冰相变会影响膜电极组件(MEA).以-10℃及-20℃到正常操作温度的冰冻-解冻循环模拟实际工况,考察了水结冰对PEMFC性能的影响,结果表明:PEMFC的电化学活性表面积变小,扩散层的孔结构发生了变化,PEMFC的性能衰减.采用干燥N2吹扫、真空排水和RH=58.0%(25℃)的反应气吹扫等3种方法来避免水结冰的影响,发现经过冰冻-解冻循环后,PEMFC的性能均未下降.     

钠水玻璃/石墨复合双极板的性能

在室温下,用模压法制备了钠水玻璃/石墨亲水性导电复合材料;讨论了石墨含量、石墨粒径、模压压力以及模压时间对复合材料电导率的影响,并对不同石墨含量的复合材料的含水量进行了分析.结果表明:含有40%石墨的钠水玻璃/石墨导电复合材料的电导率能满足PEMFC双极板的要求;通过优化模压工艺,可进一步提高该复合材料的电导率;复合材料含有凝胶毛细孔,拥有约9%的含水量,在PEMFC运行时能够对质子交换膜进行增湿.     

质子交换膜燃料电池动态特性的建模与仿真

详细分析了质子交换膜燃料电池（PEMFC）的电化学模型。在此基础上，运用Matlab的Simulink仿真工具建立仿真模型，通过此模型，分析当电池电流出现阶跃变化时，电池电压、输出功率、消耗功率、电池效率以及电池等效内阻的动态响应。此模型也可用于电堆的仿真与设计，此研究对燃料电池的优化与控制可提供帮助。     

Design of a fuel cell generation system using a PEMFC simulator

In this paper, a PCS (power conditioner system) design for a fuel cell generation system has been proposed. In order to analyze the dynamic performance of the PCS, a fuel cell stack simulator is also designed, which can consider the dynamic V–I characteristics of the PEMFC (proton exchange membrane fuel cell). First, we explain the PCS design for a fuel cell generation system in detail along with the system configuration and operational principle of the developed PEMFC simulator that has been investigated. In addition, we cover the validity of the proposed system that has been verified by informative simulation and experimental results.     

Investigations on the variation of corrosion and contact resistance characteristics of metallic bipolar plates manufactured under long-run conditions

Tribological variations, surface conditions (roughness, hardness, coating) and surface interactions between micro-stamping dies and bipolar plate blanks play a critical role in determining the surface quality, channel formation and precision of bipolar plates. This study is aimed to understand the cause, mechanism and consequences of interactions between micro-stamping process conditions and bipolar plate quality. A total of 2000 repeated micro-stamping of 51 μm-thick uncoated and 1 μm-thick ZrN coated SS316L sheet blanks into an array of 750 μm micro-channels were performed using 175-220 kN force levels with constant stamping speed of 1 mm/s. Microscopic examinations were conducted periodically on both die and coated & uncoated plate surfaces to observe topographic variations. In addition, corrosion and contact resistance tests were carried out in the same intervals. Analysis of variance (ANOVA) technique was used to determine the significance of the process parameters on channel height, roughness, corrosion and contact resistance differences. The results revealed similar roughness trends for die and plate surfaces during 2000 micro-stampings. ZrN coating with 1 μm thickness dramatically improved corrosion and contact resistance behavior of plates.     

Effect of manufacturing processes on formability and surface topography of proton exchange membrane fuel cell metallic bipolar plates

Metallic bipolar plates in PEM fuel cells offer low-volume, low-mass and low-cost stack fabrication in addition to superior durability when compared to composite bipolar plates, which suffer due to their much higher thickness and less durability. This study aims to address the formability and surface topography issues of metallic bipolar plates fabricated by stamping and hydroforming technologies. Particular emphasis was given to process repeatability, surface topology, and dimensional quality of bipolar plates that would greatly affect the corrosion and contact resistance characteristics. Thin metal sheets of several alloys (i.e., SS304, SS316L, SS430, Ni270, Ti grades 1 and 2) were used in the fabrication experiments. SS304 and SS316L were shown to possess better formability when compared to other alloys that were used in this study, while SS430 and Ti grade 2 demonstrated the worst among all. Channel formability was observed to be greatly affected by the hydroforming pressure, while it does not differ much above certain level of stamping force. The confocal microscopy analyses showed that surface roughness values of the formed samples were altered significantly when compared to the initial flat blanks. In general, increasing hydroforming pressure and stamping force yielded higher surface roughness values at channel peaks. In addition, the surface topography was shown to be influenced mainly by the pressure level rather than the pressure rate in hydroforming process.     

A study on the integration of micro‐reformer and high‐ temperature PEM fuel cell

This study presented an integration platform for a methanol reformer and high‐temperature proton exchange membrane fuel cell (PEMFC). The methanol micro‐reformer was combined with the catalytic reaction section and reforming section, whereas the catalytic reaction section with Pt catalysis maintained the constant temperature environment for a reforming process. SRM reforming results showed that 74 to 74.9% hydrogen and 23.5 to 25.7% of carbon dioxide in the mixture product, and less than 2% of carbon monoxide, was produced. Using the reforming product of low carbon monoxide concentration and the highest methanol conversion rate, a micro reformer link with a fuel cell integration experiment was performed. Results showed a high temperature PEMFC with 3 to 4 W power output under methanol flow rates of 15 ml/hr. Due to the lower hydrogen pressure supplied from the micro reformer, the fuel cell power output may become unstable. © 2010 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/htj.20322