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摘要随着经济的进步，社会的进步，当今世界对能源的利用率要求越来越高。而其中燃料电池优秀的能量转换率为解决世界能源问题提供了思路。而燃料电池的化学反应的瓶颈就在于阴极，提高阴极的性能，成为重中之重。向多孔阴极中浸渍入纳米尺度的电催化剂可以大幅提高电性能，但是因为纳米尺度的颗粒在高温作用下易长大或损坏会导致电极性能的衰退。另一方面，随着中低温固体氧化物燃料电池工作温度的降低，连接材料选用成本低廉的不锈钢成为可能。但是不锈钢中的铬元素对大量的中低温阴极具有毒化作用，因此开发具有抗铬毒化能力的阴极显得急迫而重要。本文将焦点集中在两方面，一、直接选用具备抗铬毒化能力的LNF作为基体电极材料，以提高其氧化还原能力为目标进而提高电极的抗铬毒化能力。二、采用具备反应扩散潜力的浸渍前驱溶液浸渍电极，使得在电极表面生成一层具有不同于纳米颗粒形态的结构，再将纳米颗粒作为第二相加入其中。加入碱土、过渡金属元素的钴酸锶、钡前驱，在高温作用下会与基体中的镧元素形成新的产物，低温时存在的钴酸锶、钴酸钡会在高温作用下逐步消失，复相浸渍后的试样在40个小时内能够文持在比较稳定的范围，随着时间的增长会逐步上升。29455
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关键词 中温燃料电池 纳米 电催化 浸渍
毕业论文设计说明书外文摘要
Title Complex impregnated cathode of LNF to resist Cr poisoning
Abstract
With the progress of economy, the progress of the society, the world demands for energy utilization is getting higher and higher nowadays. And the excellent energy of fuel cells provides ideas to solve the world's energy problems. The bottleneck of the chemical reaction of fuel cell is the cathode. Improving the performance of cathode has become a top priority. Infiltrating nanoscale catalyst into the porous cathode can greatly improve the performance, but nanoscale particles under the action of high temperature leads to easy to grow up or damage to the electrode performance decline. On the other hand, as in the low temperature solid oxide fuel cell operating temperature is reduced, using cheap stainless steel as connecting material for SOFC can be possible. But chromium element of a large number of low temperature of the stainless steel cathode have poison effect, thus develop cathode with the chromium poison resistance appear urgent and important. This article will focus on two aspects, one, direct selection with chromium poison resistance material LNF as substrate electrode material, to improve its redox ability as the goal to improve electrode chromium poison resistance. Two, take material which has the potential for reaction diffusion as impregnation precursor solution immersion electrode, on the electrode surface has generated a layer with different structure in the form of nanoparticles, nanoparticles as the second phase. Alkaline earth and transition metal elements of strontium, barium, cobalt acid precursors, under high temperature and matrix of lanthanum elements into a new product, the low temperature of SC or BC under high temperature is gradually disappear. the complex phase samples in 40 hours after dipping to maintain in the scope of the stable growth will be gradually increased over time.
Keywords ITSOFC nanoscale electrochemical impregnation
目 次
1 绪论 1
1.1 引言 1
1.2 SOFC的优势 1
1.3 SOFC的组成及工作原理 2
1.4 SOFC中各部件特性要求 3
1.5 阴极材料的发展历史与现状 4
1.6 铬毒化阴极背景与抗毒化策略 5
2 实验和表征 6
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