超声作用下直接甲醇燃料电池的性能研究

发布时间：2018-03-27 18:07

本文选题：直接甲醇燃料电池　切入点：超声辐射　出处：《武汉理工大学》2015年硕士论文

【摘要】：直接甲醇燃料电池(Direct Methanol Fuel Cell,DMFC)由于其具有燃料可再生、能量密度高、环境工作条件以及快速补给等优点,被期望用于未来的电子设备(笔记本电脑,手机,PDAs等)的电源。虽然很多研究人员对其进行了相关研究,但是,由于在运行过程中有甲醇渗透和催化剂中毒等问题的存在,直接甲醇燃料电池的应用也没有得到大规模的推广。本文提出了利用超声辐射的方法来提高电池性能。为此,本文设计并制造了一种在阳极流场通道内安装三个小型超声换能器的DMFC。完成了超声关键发生元件的设计制作以及直接甲醇燃料电池测试系统的搭建,并在完成的测试平台上完成了测试方法的研究。最后,研究了不同运行条件下的电池性能和电池开路电压。主要的研究内容如下:首先,针对本课题完成了相应的直接甲醇燃料电池测试系统的总体方案设计。结合超声空化的产生条件和影响因素,完成了超声发生系统关键零部件的设计与制作。同时,结合超声系统设计制作了实验用的直接甲醇燃料电池。本文设计的直接甲醇燃料电池主要由有效面积为5×5cm2的MEA膜,两个蛇形流场板,三个超声元件(压电陶瓷,PZT-8)和透明盖板组成。其次,针对小型低电压燃料电池测试中出现的问题,本文提出利用升压电源提供稳定电压的同时,利用电子负载远程sense功能,对测试导线上的压降进行补偿,并在测试电路中引入电子负载的反向电压保护电路来保证电池测试的准确性和真实性。本文提出的测试方法简单方便,而且经济适用,并通过理论和测试证明了该方法的可行性。最后,在完成的测试系统平台上,针对不同超声条件和运行条件(超声频率、声功率、甲醇溶液浓度),完成了DMFC的性能测试实验和稳态开路电压测试。稳态开路电压测试实验结果表明,甲醇浓度是影响电池开路电压的主要因素,但是可以通过提高声功率的方法来提高电池开路电压。性能测试实验结果表明,在电池运行条件相同的情况下,超声辐射可以提高电池性能。而且在系统共振条件下,电池性能提升最高。而且超声对高浓度DMFC和低浓度DMFC的作用效果不同。
[Abstract]:Direct Methanol Fuel Fuel DMFCs are expected to be used in future electronic devices (laptops) due to their advantages of renewable fuel, high energy density, environmental working conditions and rapid recharge. Although many researchers have done some research on it, however, there are problems such as methanol permeation and catalyst poisoning during operation. The application of direct methanol fuel cell has not been popularized on a large scale. In this paper, the ultrasonic radiation method is proposed to improve the performance of the cell. In this paper, a DMFC with three small ultrasonic transducers in the anodic flow field channel is designed and fabricated. The design and fabrication of the key ultrasonic components and the construction of the direct methanol fuel cell testing system are completed. Finally, the battery performance and open circuit voltage under different operating conditions are studied. The main research contents are as follows: first, The overall scheme design of the corresponding direct methanol fuel cell testing system is completed. The key parts and components of ultrasonic generating system are designed and manufactured according to the producing conditions and influencing factors of ultrasonic cavitation. The experimental direct methanol fuel cell is designed and fabricated with ultrasonic system. The designed direct methanol fuel cell is mainly composed of MEA film with an effective area of 5 脳 5cm2 and two snake flow field plates. Three ultrasonic elements (piezoelectric ceramic PZT-8) and transparent cover plate are formed. Secondly, aiming at the problems in the test of small low-voltage fuel cells, this paper proposes to use the booster power supply to provide stable voltage while using the remote sense function of electronic load. The voltage drop on the test wire is compensated, and the reverse voltage protection circuit of the electronic load is introduced into the test circuit to ensure the accuracy and authenticity of the battery test. The feasibility of the method is proved by theory and test. Finally, on the platform of the test system, aiming at different ultrasonic conditions (ultrasonic frequency, sound power, ultrasonic frequency, acoustic power), The experimental results of DMFC performance test and steady-state open-circuit voltage test show that methanol concentration is the main factor affecting the open circuit voltage of the battery. However, the open circuit voltage of the battery can be improved by increasing the sound power. The experimental results show that ultrasonic radiation can improve the performance of the battery under the same operating conditions. The effect of ultrasound on high concentration DMFC and low concentration DMFC is different.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM911.4

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