In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2014-01, No. 15 ( 2014-04-01), p. 668-668
Abstract:
The relevance of the sintering of electrocatalysts and voltage drops of HT-PEMFC was theoretically evaluated under the non-humid conditions at 150 °C, 170 °C and 190 °C. The degree of agglomeration of electrocatalysts over time simulated by three-dimensional kinetic Monte Carlo method was compared and quantitatively agreed with experimentally measured Transmission Electron Microscopy (TEM) results. Agglomeration of electrocatalysts leads to the loss of the electrochemically active surface area. It was found to be occurred more severe as temperature increased. Decreasing rate of the proton conductivity was calculated based on the tortuosity of the proton pass. The more the phosphoric acid was evaporated, the more tortuous the proton path became. A theoretical breakdown of the voltage drops indicated that the deterioration of electrocatalysts impacted on the earlier several hundreds of hours. The decrease in the voltage at the latter stage was due to mainly the decrease in the proton conductivity.
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2014-01/15/668
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2014
detail.hit.zdb_id:
2438749-6