本文關(guān)鍵詞：質(zhì)子交換膜燃料電池用炭紙制備工藝改進研究　出處：《湖南工業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 質(zhì)子交換膜燃料電池(PEMFC) 炭紙 聚乙烯醇縮丁醛(PVB) 酚醛樹脂 炭黑

【摘要】：炭紙作為燃料電池的氣體擴散層,擔負集流體、支撐催化劑、透氣和排水的重要作用,其性能將直接對燃料電池的性能產(chǎn)生重要影響。本文著眼于對炭紙制備過程中常用的酚醛樹脂浸漬劑進行改性,制備了具有更好的力學性能和物理性能的燃料電池用炭紙。首先,利用聚乙烯醇縮丁醛(PVB)對酚醛樹脂進行改性,不僅改善了基體炭與炭纖維的相界面,而且使基體炭在炭紙中形成了良好的導(dǎo)電網(wǎng)絡(luò)結(jié)構(gòu)。研究采用兩次浸漬的方法,在酚醛樹脂中添加不同濃度的PVB對炭紙結(jié)構(gòu)及性能的影響,并對樣品的物理性能(強度、孔隙率、透氣性、電阻率)和電池性能進行了表征。結(jié)果表明,隨PVB含量的增加,炭紙的抗彎強度從36.75 MPa增加到52.28 MPa;電阻率從12.63 mΩ·cm下降到9.97 mΩ·cm;孔隙率略增加;透氣性略降低。PVB濃度為0.06 mol/L時所制備的炭紙具有最好的綜合性能,其電池的最大輸出功率相比于未經(jīng)PVB處理的炭紙?zhí)岣吡?8%。其次,利用炭黑對經(jīng)PVB改性的性能最優(yōu)的炭紙做進一步改進。炭黑進入炭纖維間的孔隙中,形成了良好的導(dǎo)電網(wǎng)絡(luò),但同時改變了基體炭的結(jié)構(gòu)。研究添加不同含量的炭黑對炭紙結(jié)構(gòu)和性能的影響,并對樣品的物理性能進行表征,結(jié)果表明:隨著加入炭黑含量的增加,炭紙的厚度維持在0.170 mm左右;強度、孔隙率、透氣性下降,電阻率先從10.58 mΩ·cm下降到6.64 mΩ·cm,后升高。為進一步優(yōu)化炭紙性能,對其熱處理溫度進行了研究,對改性樹脂進行了熱重分析,進而制定炭化工藝曲線。對高溫處理后炭紙的物理性能進行了表征,結(jié)果表明:隨熱處理溫度的升高,炭紙的厚度、電阻率減小;強度、孔隙率、透氣性下降。研究確定不同的高溫處理后,炭紙厚度、密度、透氣性、強度、導(dǎo)電性的變化規(guī)律,為制備不同性能要求的炭紙?zhí)峁﹨⒖家罁?jù)。
[Abstract]:As the gas diffusion layer of fuel cell, carbon paper plays an important role in collecting fluid, supporting catalyst, air permeability and drainage. Its performance will directly affect the performance of fuel cells. This paper focuses on the modification of phenolic resin impregnating agents commonly used in the preparation of carbon paper. Carbon paper for fuel cell with better mechanical and physical properties was prepared. Firstly, polyvinyl butyral (PVB) was used to modify phenolic resin, which not only improved the phase interface between carbon matrix and carbon fiber. Moreover, the carbon matrix formed a good conductive network structure in carbon paper. The effect of adding different concentration of PVB in phenolic resin on the structure and properties of carbon paper was studied by twice impregnation. The physical properties (strength, porosity, permeability, resistivity) and battery performance of the samples were characterized. The results showed that the physical properties of the samples increased with the increase of PVB content. The flexural strength of carbon paper increased from 36.75 MPa to 52.28 MPA; The resistivity decreased from 12.63 m 惟 路cm to 9.97 m 惟 路cm; Porosity increased slightly; The carbon paper prepared with slightly lower air permeability of 0.06 mol/L has the best comprehensive properties. The maximum output power of the battery is 78% higher than that of the untreated carbon paper without PVB. Carbon black is used to further improve the carbon paper modified by PVB. Carbon black enters the pores between carbon fibers and forms a good conductive network. At the same time, the structure of carbon matrix was changed. The effect of adding carbon black on the structure and properties of carbon paper was studied, and the physical properties of the sample were characterized. The results showed that the content of carbon black increased with the addition of carbon black. The thickness of carbon paper is about 0.170 mm; The strength, porosity and permeability decreased, the resistivity decreased from 10.58 m 惟 路cm to 6.64 m 惟 路cm, and then increased. In order to further optimize the properties of carbon paper. The heat treatment temperature was studied, the thermogravimetric analysis of the modified resin was carried out, and the carbonization process curve was established. The physical properties of the carbon paper after high temperature treatment were characterized. The results show that the thickness and resistivity of carbon paper decrease with the increase of heat treatment temperature. The changes of carbon paper thickness, density, permeability, strength and conductivity are determined after different high temperature treatment, which provides a reference for the preparation of carbon paper with different properties.
【學位授予單位】：湖南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM911.4

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