本文選題：直接乙二醇燃料電池　切入點(diǎn)：電極極化　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：環(huán)境污染和能源危機(jī)是兩個目前人類面臨的最重要的問題,解決了這兩個問題可以實(shí)現(xiàn)人類社會的可持續(xù)發(fā)展。利用熱機(jī)通過化石燃料燃燒功能方式既不環(huán)保,效率也不高。因此,近幾十年來燃料電池技術(shù)由于高效綠色可持續(xù)等特點(diǎn),受了廣泛的關(guān)注和研究。其中,直接醇類燃料電池因其采用小分子醇類作為燃料,燃料來源廣泛,儲存運(yùn)輸方便,是燃料電池中重要的研究方向。由于醇類在燃料電池中完全氧化為二氧化碳比較困難,電子傳輸效率較低,但是乙二醇在燃料電池中的電子傳輸效率可以高達(dá)80%,是一種極具發(fā)展?jié)摿Φ娜剂稀Ｖ苯右叶既剂想姵氐妮敵鲭妷河申枠O電勢與陰極電勢共同決定,然而電池實(shí)際運(yùn)行時,實(shí)際陰陽極電勢都會偏離電極理論電勢,導(dǎo)致電池性能降低。本文旨在為直接乙二醇燃料電池建立一維模型,得以探究不同運(yùn)行工況對電池電極極化的影響,避免了復(fù)雜繁瑣的電池組裝及測試過程,對電池實(shí)際設(shè)計(jì)具有重要的參考意義。主要研究內(nèi)容如下:(1)直接乙二醇燃料電池多孔電極極化模型建立在直接乙二醇燃料電池體系中,其性能受到電池溫度,電催化劑及其組成以及電解質(zhì)膜類型及結(jié)構(gòu)等諸多因素的影響。為了能直觀研究電池設(shè)計(jì)參數(shù)對性能的影響,考慮電池中物質(zhì)傳輸、電荷傳輸和電化學(xué)反應(yīng)三者的協(xié)同作用,利用物質(zhì)運(yùn)輸方程、電化學(xué)動力學(xué)方程、方程的邊界條件,建立起電池輸出電壓與電路電流密度的關(guān)系。(2)陰離子交換膜直接乙二醇燃料電池多孔電極極化模型計(jì)算分析利用建立的直接乙二醇燃料電池極化模型對燃料電池極化進(jìn)行了綜合分析,得到陰離子交換膜直接乙二醇燃料電池陰陽極活化極化、濃差極化和歐姆極化的曲線分布。接著分析不同物質(zhì)不同濃度和電池結(jié)構(gòu)參數(shù)對電池性能的影響,研究最佳的運(yùn)行工況,為提高電池性能提供指導(dǎo)意見。(3)質(zhì)子交換膜直接乙二醇燃料電池多孔電極極化模型計(jì)算分析針對最近有學(xué)者提出質(zhì)子交換膜也可以在堿性條件下作為離子交換膜來傳輸氫氧根離子來保持電荷平衡。利用前述已完成的工作,對該類新型結(jié)構(gòu)的直接乙二醇燃料電池進(jìn)行模擬計(jì)算,分析不同運(yùn)行工況對電池性能的影響,得到最佳的運(yùn)行條件。(4)質(zhì)子交換膜直接乙二醇燃料電池多孔電極極化實(shí)驗(yàn)研究針對已完成的質(zhì)子交換膜直接乙二醇燃料電池多孔電極極化模型,采用實(shí)驗(yàn)研究的方法探究不同工況對電池性能的影響。主要研究陽極堿濃度和陰極氧氣濃度對電池性能的影響,為實(shí)際質(zhì)子交換膜直接乙二醇燃料電池的運(yùn)行工況參數(shù)選擇提供依據(jù)。
[Abstract]:Energy crisis and environmental pollution are the two most important currently facing humanity problems, solve these two problems can realize the sustainable development of human society. The use of heat by the burning of fossil fuels is not environmental protection function, efficiency is not high. Therefore, in recent decades the fuel cell technology due to the high efficiency of green and sustainable characteristics. Due to the extensive concern and research. Among them, the direct alcohol fuel cell because of its use of small molecular alcohols as fuel, fuel sources, convenient storage and transportation, is an important research direction of fuel cell. The complete oxidation of alcohols in the fuel cell for carbon dioxide is difficult, the efficiency of electron transfer is low, but the electronic transmission efficiency of B glycol in the fuel cell can be as high as 80%, is a promising fuel. Direct ethylene glycol by the output voltage of the fuel cell cathode and anode potential The potential is determined, but the battery in actual operation, the actual anode potential will deviate from the theory of electrode potential, resulting in lower cell performance. This paper aims to establish a one-dimensional model for direct ethylene glycol fuel cell, to explore the different effect of operation conditions on cell polarization, to avoid the battery assembly and testing process is complicated, the actual battery the design has the important reference significance. The main contents are as follows: (1) direct B porous electrode polarization model of fuel cell based on direct glycol ethylene glycol fuel cell system, its performance is influenced by the battery temperature, influence of catalysts and its composition and electrolyte membrane type and structure and other factors. In order to study the influence of design parameters directly on the performance of the battery, considering battery material transfer, the synergistic effect of charge transport and electrochemical reaction of the three, using the material transport equation, electrochemical Study of dynamics equation, the boundary conditions of the equations, establish the relationship between the output voltage of the battery and the circuit current density. (2) analysis of ethylene glycol direct fuel cell polarization model is established by using the comprehensive analysis on the fuel cell polarization anion exchange membrane direct ethylene glycol fuel cell porous electrode polarization model by anion exchange membrane direct ethylene glycol fuel cell anode activation polarization, concentration polarization and ohm polarization curve distribution. Then analyze the effect of different materials of different concentration and cell structure parameters on the performance of battery, study on the optimal operation condition, to provide guidance to improve the performance of the battery (3). Recently some scholars put forward the calculation and Analysis on the proton exchange membrane can also in alkaline under the condition of as ion exchange membrane to transfer hydroxyl ions to protect the proton exchange membrane fuel cell direct ethylene glycol porous electrode polarization model Hold the charge balance. The work has been completed, the direct fuel cell of the ethylene glycol type structure were simulated. Analysis of the influence of different operating conditions on the performance of the battery, get the best operating conditions. (4) proton exchange membrane direct study of porous electrode polarization ethylene glycol glycol direct exchange membrane fuel cell fuel cell porous electrode polarization model for proton has been completed, the paper explores the influence of different conditions on the performance of the battery. The main research is the influence of anode and cathode alkali concentration of oxygen concentration on the performance of battery, operating parameters of ethylene glycol exchange membrane direct fuel cell for the actual proton selection provides the basis.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM911.4

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