AI Article Synopsis
- The study utilized in situ high temperature transmission electron microscopy (TEM) to examine how moisture affects the structural changes of heated nano materials, specifically platinum catalysts on carbon black (Pt/CB).
- High moisture content (above 94% RH) was introduced, revealing that platinum particles moved and clustered together before the degradation of the carbon black support, while at low moisture (34% RH), the carbon black degraded first.
- The findings indicate that the level of humidity significantly influences the behavior of the platinum particles and the stability of the carbon black support when subjected to heat.!*
Article Abstract
To clarify the influence of moisture on the structural changes of heated nano materials, in situ high temperature transmission electron microscopy (TEM) has been carried out using a conventional analytical TEM combined with a gas injection-specimen heating holder. Air with high moisture content, above 94% relative humidity (RH), from a humidifier was directly injected onto the heated platinum catalyst dispersed on carbon black (Pt/CB), and the morphological changes of the specimens were observed at high magnification dynamically. The result of the experiment was compared with a result obtained from an experiment using air with a low moisture content, 34% RH. Active movement of the Pt particles, leading agglomeration and grain growth, occurred prior to degradation of the CB support at high moisture content. In contrast, the degradation of the CB support leading agglomeration and grain growth of the Pt particles occurred before the displacement of the Pt particles on the CB supports in a low humidity environment.
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| http://dx.doi.org/10.1093/jmicro/dfs041 | DOI Listing |
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