| 摘要 |
The invention disclosed relates to layered catalyst layer structures for fuel cells, particularly Proton Exchange Membrane Fuel Cell (PEMFC), the catalyst layers produced by a Reactive Spray Deposition Technology (RSDT) process. The catalyst layers so produced contain particles sized between 1 and 15 nm and clusters of said particles of a catalyst selected from the group consisting of platinum, platinum alloys with transition metals, mixtures thereof and non-noble metals. The catalyst layers without an electrically conducting supporting medium, exhibit dendritic microstructure providing high electrochemically active surface area and electron conductivity at ultra-low catalyst loading. The catalyst layers deposited on an electrically conducting medium, such as carbon, exhibit three-dimensional functional grading which provides efficient utilization of the catalyst, high PEMFC performance at the low catalyst loading, and minimize limitations caused by reactant diffusion and activation. A single-run deposition method to produce the catalytic layers is also disclosed. |
