本文選題：自呼吸式μDMFC　切入點(diǎn)：模型　出處：《杭州電子科技大學(xué)》2017年碩士論文

【摘要】：和其他類(lèi)型微能源不同,微型直接甲醇燃料電池(Micro Direct Methanol Fuel Cell,μDMFC)具有燃料源充足且花費(fèi)小、燃料本身方便保存與隨身攜帶、并且不存在安全隱患、構(gòu)造簡(jiǎn)單且不需要原料重整和凈化、以及運(yùn)行條件易于實(shí)現(xiàn)等諸多優(yōu)勢(shì),更適用于未來(lái)便攜式電子產(chǎn)品和微型武器系統(tǒng)的應(yīng)用,正日益受到人們的密切關(guān)注,是國(guó)際上研究的熱門(mén)范疇。本文的主要工作內(nèi)容如下:1、詳細(xì)介紹了μDMFC,包括μDMFC的組成結(jié)構(gòu),各個(gè)結(jié)構(gòu)詳解,工作原理,工作過(guò)程中發(fā)生的電化學(xué)反應(yīng);以及多孔介質(zhì)中兩相流傳輸理論,包含液體的飽和度、相對(duì)滲透率、接觸角、毛細(xì)壓強(qiáng)的作用力;電池本身的特點(diǎn)和極化的存在及影響電池性能的關(guān)鍵點(diǎn)。為下文的三維兩相模型仿真提供理論依據(jù)。2、從理論上詳細(xì)分析了氣液物質(zhì)傳輸和發(fā)生反應(yīng)的方程式、PEM中的甲醇和水滲透作用、電子和質(zhì)子傳輸方法。3、提出自呼吸式μDMFC的一種新結(jié)構(gòu)。建立三維兩相模型并分析結(jié)果,包括各物質(zhì)分布情況以及濃度分布對(duì)電池性能的影響;壓強(qiáng)和流速分布及對(duì)電池性能的影響;飽和度分布情況及對(duì)電池的影響;電勢(shì)和電流密度分布情況及對(duì)電池性能的影響;溫度分布及對(duì)電池性能的影響;其他參數(shù)對(duì)電池性能的影響,從而得到較好的結(jié)構(gòu)參數(shù)。4、結(jié)果表明:陽(yáng)極傳質(zhì)與電池的性能關(guān)系最大,其次是陰極氧氣傳輸;甲醇傳輸主要依靠擴(kuò)散,所以物質(zhì)運(yùn)動(dòng)流速及壓強(qiáng)對(duì)電池性能關(guān)系較弱;甲醇的滲透會(huì)在陰極發(fā)生反應(yīng)產(chǎn)生混合過(guò)電位,電池的性能會(huì)因此而降低;甲醇傳輸至陰極主要是擴(kuò)散引起的,電流密度較高的時(shí)候,滲透量會(huì)變小,如果甲醇濃度變大的話,則滲透效果也會(huì)更劇烈;陽(yáng)極的氣壓變化梯度要大于陰極的,因?yàn)殛?yáng)極主要是液相物質(zhì),陰極主要是氣相物質(zhì),氣相物質(zhì)流動(dòng)性好,陰極的壓強(qiáng)變化小;隨著反應(yīng)的進(jìn)行,陰極會(huì)出現(xiàn)“水淹”現(xiàn)象;電子電流主要是和電流收集器結(jié)構(gòu)有關(guān),質(zhì)子電流主要是隨著甲醇濃度分布變化。
[Abstract]:Unlike other types of micro-energy sources, micro Direct Methanol Fuel cells (渭 DMFCs) have sufficient fuel sources and low cost, and the fuel itself is easy to save and carry around, and there is no security hazard.Many advantages, such as simple construction, no need for raw material reforming and purification, and easy to realize operating conditions, are becoming more and more suitable for the application of portable electronic products and micro weapon systems in the future.It is a hot area of international research.The main work of this paper is as follows: 1. The composition of 渭 DMFCs, including the composition of 渭 DMFCs, the detailed explanation of each structure, the working principle, the electrochemical reactions occurring in the working process, and the transport theory of two-phase flow in porous media, including the saturation of liquid, are introduced in detail.The relative permeability, contact angle, capillary pressure, the characteristics of the battery itself, the existence of polarization and the key points affecting the performance of the battery.This paper provides the theoretical basis for the simulation of the three-dimensional two-phase model below, and theoretically analyzes the methanol and water permeation in the equation of gas-liquid material transport and reaction in PEM.Electron and proton transport method. 3. A new structure of self-breathing 渭 DMFC is proposed.Three-dimensional two-phase model was established and the results were analyzed, including the distribution of various substances and the influence of concentration distribution on the performance of the battery, the distribution of pressure and velocity and the influence on the performance of the battery, the distribution of saturation and the influence on the battery.The distribution of potential and current density and its effect on the performance of the battery; the temperature distribution and the effect on the performance of the battery; and the effect of other parameters on the performance of the battery,The results show that the anode mass transfer has the largest relationship with the performance of the battery, followed by the cathode oxygen transport, and the methanol transport mainly depends on diffusion, so the relationship between the mass transfer rate and the pressure on the cell performance is weak.The permeation of methanol will produce mixed overpotential at the cathode, and the performance of the cell will be reduced. The methanol transport to the cathode is mainly caused by diffusion. When the current density is high, the permeation will become smaller, if the methanol concentration increases,The pressure gradient of the anode is larger than that of the cathode, because the anode is mainly a liquid phase material, the cathode is mainly a gas phase material, and the gas phase material fluidity is good, and the pressure of the cathode changes little; as the reaction proceeds,The electron current is mainly related to the structure of the current collector, and the proton current mainly varies with the concentration distribution of methanol.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM911.4

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本文編號(hào)：1691755