Abstract
We investigated the effects of cell temperature and the humidity of gas supplied to the cell during the load cycle durability test protocol recommended by The Fuel Cell Commercialization Conference of Japan (FCCJ). Changes in the electrochemically active surface area (ECA) and in the amount of carbon support corrosion were examined by using the JARI standard single cell. The ECA declined more quickly when the gas humidity was raised, and the carbon corrosion was at the same level. These results suggest that the agglomeration of platinum was accelerated by the same agglomeration mechanism, i.e., by raising the humidity of the gas supplied to the cell.
Highlights
To facilitate the widespread use of fuel cell vehicles, it is important to improve the durability and reduce the cost of fuel cell stacks
As a method of testing the durability of membrane electrode assemblies (MEAs), potential cycle tests that simulate the operation of a fuel cell vehicle are widely used
We investigated the effects of cell temperature and the humidity of gas supplied to the cell on Conclusions the4.stability of the platinum catalyst during the load cycle durability test, in order to shorten the testing We time without changing the phenomenon platinum investigated the effects of celldeterioration temperature and the humidityofofthe gas carbon-supported supplied to the cell on the catalyst
Summary
To facilitate the widespread use of fuel cell vehicles, it is important to improve the durability and reduce the cost of fuel cell stacks. As a method of testing the durability of membrane electrode assemblies (MEAs), potential cycle tests that simulate the operation of a fuel cell vehicle are widely used. The load cycle durability test, which simulates acceleration and deceleration under automotive use, is used as an accelerated durability test of the platinum catalyst. The influence of environmental conditions during the load cycle durability test on the agglomeration rate of platinum was investigated. The influence of environmental conditions such as temperature and humidity on the decline of ECA during potential cycle tests has been investigated. It is suggested that low relative humidity operation during load cycling is important in suppressing the Pt degradation from Pt dissolution and Pt particle growth in the cathode catalyst layer [2]. The influence of humidity on the agglomeration of Pt is mostly evaluated up to 100% relative humidity, and there are few evaluation examples at supersaturation condition
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