The effects of two catalyst fabrication techniques, impregnation method and colloidalmethod, on the performance of the oxygen electrode are studied and the difference in the catalyticactivity of the two kinds of catal...The effects of two catalyst fabrication techniques, impregnation method and colloidalmethod, on the performance of the oxygen electrode are studied and the difference in the catalyticactivity of the two kinds of catalysts towards oxygen reduction are also analyzed with the aid ofTEM and XRD. Based on the results and analysis, the following conclusions are obtained :thecatalyst fabricatin technique exerts an effect on the performance of the oxygen electrode, com-paring the performance of the Pt/C catalyst prepared by impregnation method with that of thePt/C catalyst prepared by colloidal method, the latter shows a higher catalytic activity towardsoxygen reduction; Pt/C electrocatalyst has small particle size and large fraction of Pt(111) crystalsurface.展开更多
A practical method of estimation for the internal-resistance of polymer electrolyte membrane fuel cell (PEMFC) stack was adopted based on radial basis function (RBF) neural networks. In the training process, k-means c...A practical method of estimation for the internal-resistance of polymer electrolyte membrane fuel cell (PEMFC) stack was adopted based on radial basis function (RBF) neural networks. In the training process, k-means clustering algorithm was applied to select the network centers of the input training data. Furthermore, an equivalent electrical-circuit model with this internal-resistance was developed for investigation on the stack. Finally using the neural networks model of the equivalent resistance in the PEMFC stack, the simulation results of the estimation of equivalent internal-resistance of PEMFC were presented. The results show that this electrical PEMFC model is effective and is suitable for the study of control scheme, fault detection and the engineering analysis of electrical circuits.展开更多
文摘The effects of two catalyst fabrication techniques, impregnation method and colloidalmethod, on the performance of the oxygen electrode are studied and the difference in the catalyticactivity of the two kinds of catalysts towards oxygen reduction are also analyzed with the aid ofTEM and XRD. Based on the results and analysis, the following conclusions are obtained :thecatalyst fabricatin technique exerts an effect on the performance of the oxygen electrode, com-paring the performance of the Pt/C catalyst prepared by impregnation method with that of thePt/C catalyst prepared by colloidal method, the latter shows a higher catalytic activity towardsoxygen reduction; Pt/C electrocatalyst has small particle size and large fraction of Pt(111) crystalsurface.
基金Project (2003AA517020) supported by the National High-Tech Research and Development Program of China
文摘A practical method of estimation for the internal-resistance of polymer electrolyte membrane fuel cell (PEMFC) stack was adopted based on radial basis function (RBF) neural networks. In the training process, k-means clustering algorithm was applied to select the network centers of the input training data. Furthermore, an equivalent electrical-circuit model with this internal-resistance was developed for investigation on the stack. Finally using the neural networks model of the equivalent resistance in the PEMFC stack, the simulation results of the estimation of equivalent internal-resistance of PEMFC were presented. The results show that this electrical PEMFC model is effective and is suitable for the study of control scheme, fault detection and the engineering analysis of electrical circuits.