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Upgrade of Electrode Coating Technology for Proton-Exchange Membrane Fuel Cells (PEMFCs) by the Dispersion Control of Nano-particles

通过纳米颗粒分散控制升级质子交换膜燃料电池（PEMFC）电极涂层技术

基本信息

批准号：
13450318
负责人：
USUI Hiromoto
金额：
$ 9.28万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450318/
关键词：
Fuel cell coating of nano-particles rheology dispersion control 分散ナノ微粒子電池電極 PEFC

项目摘要

From the experimental and theoretical work of this study, following conclusions were obtained.1. Suspension viscosity can be successfully predicted by using modified Usui's thixotropy model, in which the effect of non-Newtonian rheological characteristics of suspension medium is taken into account.2. The alternation of coating speed affects the local dispersion condition, which is indicated by the lower viscosity of suspension, lower cluster diameter and the different structure of catalytic layer. The agglomeration characteristics of coated slurry, i.e. the size of cluster and number of primary particles contained in a cluster are predicted by using Usui's thixotropy model.3. There is a possibility to control the coagulated particle structure after drying of PEMFCs electrode layer by changing the slurry characteristics and coating condition. There is a good correlation between the hollow space characteristic length and the luster size by the present slurry model.Effect of coating condition is observed only for the case of cathode performance of PEMFC where the chemical reaction controlling process prevails. In anode side, the cell voltage results were affected mainly by the electrocatalytic activity of the cathode, which leads to the results that no effect of the agglomeration. There is a tendency to increase the PEMFC performance according to the increase of particle dispersion rate during the slurry coating process. However, the optimum coating condition is not determined because of the limited coating condition of this study.

通过本研究的实验和理论工作，得到以下结论.采用修正的Tubei触变性模型，考虑了悬浮介质非牛顿流变特性的影响，可以成功地预测悬浮液的粘度.涂布速度的改变影响局部分散状况，表现为悬浮液粘度降低，团簇直径减小，催化层结构不同。利用Tubei的触变性模型预测了包覆浆料的团聚特性，即团簇的尺寸和团簇中所含的初级粒子数.通过改变浆料特性和涂覆条件，可以控制PEMFC电极层干燥后的凝聚颗粒结构。浆料模型计算得到的空腔特征长度与光泽度之间存在良好的相关性，涂层条件的影响仅在化学反应控制过程占主导地位的PEMFC阴极性能方面存在。在阳极侧，槽电压结果主要受阴极电催化活性的影响，这导致结果不受团聚的影响。在浆料涂覆过程中，随着颗粒分散率的增加，PEMFC的性能有提高的趋势。然而，由于本研究的包衣条件有限，因此未确定最佳包衣条件。