Structural Change of the Pt/C Electrocatalyst in Humidified Air Observed by In situ TEM
Structural Change of the Pt/C Electrocatalyst in Humidified Air Observed by In situ TEM
复制标题
原位 TEM 观察加湿空气中 Pt/C 电催化剂的结构变化
DOI：
10.1149/05002.1439ecst
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Kamino
中科院分区：
文献类型：
--
作者：
T. Shimizu;D. Imamura;T. Yaguchi;T. Kanemura;T. Kamino
对Pt/C电催化剂进行原位TEM观察，分析假阴极环境下Pt纳米颗粒和碳载体的结构变化。观察到 Pt 纳米颗粒在潮湿空气中在支撑物上主动移动，而颗粒在干燥空气中保持在支撑物上的原始位置。原位高分辨率TEM揭示了Pt颗粒主动运动背后的驱动力是Pt颗粒与碳载体之间的界面处碳载体的选择性氧化，并被水加速。空气湿度似乎在 Pt/C 电催化剂的降解中起着重要作用。
In situ TEM observation of the Pt/C electrocatalyst was conducted to analyze the structural change of Pt nano particles and carbon support under the pseudo cathode environment. The Pt nano particles were observed to move actively on the support in humidified air, while the particles to remain at their original position on the support in dry air. The in situ high-resolution TEM revealed that the driving force behind the active movement of Pt particles was the oxidation of carbon support selectively at the interface between Pt particle and carbon support, accelerated by water. It appears that the humidity of the air plays an important role in the degradation of the Pt/C electrocatalyst.