本文選題：直接甲醇燃料電池　切入點(diǎn)：超聲輻射　出處：《武漢理工大學(xué)》2015年碩士論文

【摘要】：直接甲醇燃料電池(Direct Methanol Fuel Cell,DMFC)由于其具有燃料可再生、能量密度高、環(huán)境工作條件以及快速補(bǔ)給等優(yōu)點(diǎn),被期望用于未來的電子設(shè)備(筆記本電腦,手機(jī),PDAs等)的電源。雖然很多研究人員對其進(jìn)行了相關(guān)研究,但是,由于在運(yùn)行過程中有甲醇滲透和催化劑中毒等問題的存在,直接甲醇燃料電池的應(yīng)用也沒有得到大規(guī)模的推廣。本文提出了利用超聲輻射的方法來提高電池性能。為此,本文設(shè)計(jì)并制造了一種在陽極流場通道內(nèi)安裝三個(gè)小型超聲換能器的DMFC。完成了超聲關(guān)鍵發(fā)生元件的設(shè)計(jì)制作以及直接甲醇燃料電池測試系統(tǒng)的搭建,并在完成的測試平臺(tái)上完成了測試方法的研究。最后,研究了不同運(yùn)行條件下的電池性能和電池開路電壓。主要的研究內(nèi)容如下:首先,針對本課題完成了相應(yīng)的直接甲醇燃料電池測試系統(tǒng)的總體方案設(shè)計(jì)。結(jié)合超聲空化的產(chǎn)生條件和影響因素,完成了超聲發(fā)生系統(tǒng)關(guān)鍵零部件的設(shè)計(jì)與制作。同時(shí),結(jié)合超聲系統(tǒng)設(shè)計(jì)制作了實(shí)驗(yàn)用的直接甲醇燃料電池。本文設(shè)計(jì)的直接甲醇燃料電池主要由有效面積為5×5cm2的MEA膜,兩個(gè)蛇形流場板,三個(gè)超聲元件(壓電陶瓷,PZT-8)和透明蓋板組成。其次,針對小型低電壓燃料電池測試中出現(xiàn)的問題,本文提出利用升壓電源提供穩(wěn)定電壓的同時(shí),利用電子負(fù)載遠(yuǎn)程sense功能,對測試導(dǎo)線上的壓降進(jìn)行補(bǔ)償,并在測試電路中引入電子負(fù)載的反向電壓保護(hù)電路來保證電池測試的準(zhǔn)確性和真實(shí)性。本文提出的測試方法簡單方便,而且經(jīng)濟(jì)適用,并通過理論和測試證明了該方法的可行性。最后,在完成的測試系統(tǒng)平臺(tái)上,針對不同超聲條件和運(yùn)行條件(超聲頻率、聲功率、甲醇溶液濃度),完成了DMFC的性能測試實(shí)驗(yàn)和穩(wěn)態(tài)開路電壓測試。穩(wěn)態(tài)開路電壓測試實(shí)驗(yàn)結(jié)果表明,甲醇濃度是影響電池開路電壓的主要因素,但是可以通過提高聲功率的方法來提高電池開路電壓。性能測試實(shí)驗(yàn)結(jié)果表明,在電池運(yùn)行條件相同的情況下,超聲輻射可以提高電池性能。而且在系統(tǒng)共振條件下,電池性能提升最高。而且超聲對高濃度DMFC和低濃度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.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM911.4

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