日本地球惑星科学連合2014年大会

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セッション記号 M （領域外・複数領域） » M-IS　ジョイント

[M-IS36_1PM1] 結晶成長における界面・ナノ現象

2014年5月1日(木) 14:15 〜 16:00 314 (3F)

コンビーナ:*木村 勇気(東北大学)、三浦 均(名古屋市立大学大学院システム自然科学研究科)、塚本 勝男(東北大学大学院理学研究科地学専攻)、佐藤 久夫(三菱マテリアル株式会社エネルギー事業センター那珂エネルギー開発研究所)、座長:野澤 純(東北大学金属材料研究所)、三浦 均(名古屋市立大学大学院システム自然科学研究科)

15:00 〜 15:15

[MIS36-12] 空気雰囲気下におけるPt/C触媒のSEM/STEM同時その場観察

*佐藤 岳志1、松本 弘昭1、長沖 功1、長久保 康平1、矢口 紀恵1 (1.株式会社日立ハイテクノロジーズ)

キーワード：電子顕微鏡, その場観察

In order to gain fundamental understanding of the degradation mechanisms of Pt/C catalyst, there is an increasing demand on the nanostructural characterization using TEM. We have developed the humid-air supply system in TEM, H-9500 300 kV TEM and we have success the deterioration mechanism of fuel cell electrocatalyst1. Recently, we developed in situ simultaneous SEM/STEM observation technique for surface analysis of catalyst materials using a HF-3300 Cold-FE TEM with SEM/STEM function. We succeeded in visualizing of three-dimensional movement of the Pt particles on the carbon support in the gas atmosphere by this observation technique.In situ simultaneous SEM/STEM observation of the platinum catalysts on carbon support (Pt/C; Pt: 29 wt.%) in the air conditions were carried out using HF-3300 equipped with the Cold-FE gun and the SEM/STEM function. A gas injection-heating specimen holder2 was used for the Pt/C powder heating and gas injection. Pt/C powder mounted on the tungsten wire was heated to 200 deg C in a TEM, and then, while air was spraying (up to 1.2 x 10-2 Pa) from the injection nozzle to the Pt/C, the behavior of the Pt/C was recorded as the movie file. After the air injection at about 1.0 x 10-3 Pa, the coalescence growth between Pt particles on the carbon support was observed, and the Pt particles gradually started inserting into the carbon support. After that, most all of the Pt particles on the carbon support disappeared from the surface of the carbon support. And the carbon support structure was changing into a porous morphology.We can observe that the behavior of the Pt particles on the carbon support was penetrated into the carbon support by in situ simultaneous SEM/STEM observation. These results demonstrate that the penetration of Pt particles to carbon support affects the degradation mechanism of a Pt/C electrocatalyst.1. T. Yaguchi et. al., Journal of Electron Microscopy 60(3), 217?225, (2011)2. T. Kamino et. al., Journal of Electron Microscopy 54(6), 497?503, (2005)