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摘要细菌纤文素因其独特的三文网络结构、高纯度、高结晶度和高聚合度等优势在材料工程领域具有很大的应用。利用高温碳化细菌纤文素可获得石墨化程度高的优异碳化材料，是燃料电池电极催化剂载体材料的优良替代。在前人的基础上，本课题利用木醋杆菌培养得到的细菌纤文素膜进行碳化处理，研究过程中采用了不同温度条件(600℃、800℃、1000℃)碳化细菌纤文素，通过化学还原法制备不同活性、结构形态的铂负载的CBC催化剂(Pt/CBC)，研究该催化剂在直接甲醇燃料电池中的催化性能。然后对Pt/CBC进行XRD、BET、XPS、TEM、Raman、电化学测试等表征，对比所得结果探究不同碳化条件下其催化性能机理。结果表明，Pt/CBC的性能随碳化温度的增大而变的更为优异，1000℃Pt/CBC的性能最优，与商品化碳粉(Vulcan)相比，其电化学活性表面积从37.2m2/gPt增加到63.1m2/gPt，BET表面积(SBET)从108.26m2/g增加到303.27m2/g，在甲醇氧化过程中，Pt/CBC显示出优良的抗中毒特性及电催化活性。19539
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关键词 碳化细菌纤文素 三文网络结构 直接甲醇燃料电池 阳极催化剂
毕业设计说明书（论文）外文摘要
Title An advanced direct methanol fuel cells electrocatalyst fabricated with carbonized bacterial cellulose loading platinum and the research of its working mechanism
Abstract
Owing to the unique three-dimensional network structure, high purity, high crystallinity and a high degree of polymerization, bacterial cellulose(BC) has great advantages in the field of materials engineering. Using carbonization, renewable biomaterial of BC was converted into carbonized bacterial cellulose (CBC), which was an excellent high degree of graphitization carbonized material, is an excellent alternative promising candidate material to the fuel cell anode catalyst support material. The experiment on the basis of previous work use bacterial cellulose membrane from Acetobacter xylinum static fermentation to carbonized, the research using different temperatures (600℃, 800℃, 1000℃) carbonized bacterial cellulose by chemical reduction method prepared different activities and morphology of Pt nanoparticles on CBC (Pt/CBC). Studied the catalytic performance of the direct methanol fuel cell catalysts. Then the catalyst was characterized with XRD, BET, XPS, TEM, Raman, electrochemical performance testing. Comparing with the different carbonized conditions of electrocatalyst, the performance of the catalyst becomes more excellent with increasing temperature carbonization ,1000℃Pt/CBC behaves the optimum performance of catalyst. Compared with commercial carbon powder (Vulcan), its electrochemically active surface area was increased from 37.20m2/gPt to 63.10m2/gPt and the BET surface area (SBET) was increased from 108.26m2/g to 303.27m2/g, Pt/CBC catalyst was observed superior electrocatalytic activity toward methanol oxidation resistance with an improved tolerance to poisoning species in methanol electro-oxidation process.
Keywords carbonized bacterial cellulose, three-dimensional network, direct methanol fuel cell, anode catalyst
目 次
1 绪论 1
1.1 课题研究背景 1
1.2 燃料电池概述 1
1.2.1 燃料电池的原理 1
1.2.2 燃料电池的特点 2
1.3 直接甲醇燃料电池 2