本文選題：直接甲醇燃料電池 + 集流板�。� 參考：《天津科技大學(xué)》2017年碩士論文

【摘要】：直接甲醇燃料電池(DMFC)是直接利用甲醇水溶液作為燃料,空氣中的氧氣作為氧化劑的一種燃料電池。隨著微電子技術(shù)的迅速發(fā)展,各類便攜式電子產(chǎn)品層出不窮,日趨多樣化的產(chǎn)品功能和日益捉襟見肘的電源工作時(shí)間之間的矛盾在當(dāng)今便攜式電子產(chǎn)品的發(fā)展中越來越突出。因其能量密度高、環(huán)境友好和燃料補(bǔ)充便捷等特點(diǎn)而成為國內(nèi)外研究的熱點(diǎn)。但是DMFC的實(shí)用性還需要解決大量的基礎(chǔ)科學(xué)問題,其中不同結(jié)構(gòu)的集流板對電池的輸出性能具有重要的影響,是DMFC基礎(chǔ)研究中的重點(diǎn)之一,本文圍繞集流板結(jié)構(gòu)對電池性能影響這一關(guān)鍵性問題進(jìn)行了研究。首先,本文設(shè)計(jì)并加工了相同開孔率、不同結(jié)構(gòu)的點(diǎn)狀集流板和平行集流板,再將集流板鍍上TiN保護(hù)層。研究了 DMFC各個操作參數(shù)(TiN保護(hù)層、封裝壓力、甲醇濃度)對其性能的影響。結(jié)果表明,鍍有TiN的集流板因具有良好的導(dǎo)電性和耐腐蝕性,用其組裝的電池要比集流板未鍍TiN的DMFC性能高4倍左右;封裝壓力影響擴(kuò)散層傳質(zhì)和接觸電阻,在0.5MPa的情況下,DMFC取得最優(yōu)性能;甲醇水溶液濃度最佳值為1mol/L,在50℃時(shí)電池的最大功率密度可達(dá)13.69mW/cm2。然后,本文分別研究了相同開孔率、不同特征尺寸陽極和陰極集流板對DMFC性能的影響,主要從擴(kuò)散層中的物質(zhì)傳遞和歐姆電阻的角度進(jìn)行分析。結(jié)果表明,無集流網(wǎng)的點(diǎn)狀集流板最優(yōu)特征尺寸為2.5mm,平行集流板最優(yōu)特征尺寸為2mm;含有集流網(wǎng)的點(diǎn)狀集流板最優(yōu)特征尺寸為2-3mm,平行集流板最優(yōu)特稱尺寸為2mm。最后,基于以上的實(shí)驗(yàn)分析和研究,開展了同時(shí)改變陰極和陽極集流板的實(shí)驗(yàn)。實(shí)驗(yàn)表明,同時(shí)改變兩端集流板,最佳特征尺寸是點(diǎn)狀半徑為1.5mm的集流板和平行溝槽為2mm寬的集流板。十字交錯式平行集流板的排布性能優(yōu)于肋對肋和肋對溝道槽排布方式的DMFC,肋板和溝道槽非等寬設(shè)計(jì)有利于改善肋板下擴(kuò)散層中的物質(zhì)傳遞。
[Abstract]:Direct methanol fuel cell (DMFC) is a kind of fuel cell which uses methanol aqueous solution as fuel and oxygen in air as oxidant. With the rapid development of microelectronics technology, various portable electronic products emerge in endlessly. The contradiction between the increasingly diversified product functions and the increasingly overstretched power supply working hours is becoming more and more prominent in the development of portable electronic products. Because of its high energy density, environmental friendliness and convenient fuel supply, it has become a research hotspot at home and abroad. However, the practicability of DMFC still needs to solve a large number of basic scientific problems, among which the different structure of the collector board has an important impact on the output performance of the battery, which is one of the key points in the basic research of DMFC. The effect of collector structure on battery performance is studied in this paper. Firstly, we designed and machined the same opening ratio, different structure point collecting plate and parallel collecting plate, and then coated the collector plate with TiN protective layer. The effects of DMFC operating parameters such as tin protective layer, package pressure and methanol concentration on its performance were studied. The results show that because of its good conductivity and corrosion resistance, the battery assembled with TiN has about 4 times higher performance than the DMFC without TiN plating, and the package pressure affects the mass transfer and contact resistance of the diffusion layer. In the case of 0.5MPa, the optimum concentration of methanol solution is 1 mol / L, and the maximum power density of the cell is 13.69 MW / cm ~ 2 at 50 鈩，

本文編號：1855538