Adsorption and Electinoxidation of Carbon Monoxide on High-Index Pt Single Crystals as Model Electrochemical Catalysts

作为模型电化学催化剂的高指数 Pt 单晶上一氧化碳的吸附和电子氧化

• 批准号: 18550176
• 负责人: INUKAI Junji
• 金额: $ 2.57万
• 依托单位: University of Yamanashi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18550176/
• 关键词: Platinum Single Electrodes; Carbon Monoxide; Electrooxidation; Surface Defect; Surface Diffusion; Structure Sensitivity; Electrochemical Analysis; STM; 高指数面; 電気化学的反応

In order to simulate the electrochemical reactions taking place on fuel cell catalysts, Pt(111), Pt(10 10 9), and Pt(20 19 19) surfaces were prepared, and the electroocidation reaction of carbon monoxide in perchloric acid solution was investigated by electrochemical measurements and scanning turnneling microscopy (STM). Stakes of single crystal electrodes ware prepared by annealing in a hydrogen flame and quenched in a pure water.On both Pt(111) and stepped surfaces, electrooxidation of carbon monoxide started at ca. 0.4 vs RHE, but the onset electrode potential shifted in the anodic direction as the potential was warmed between 0.05 and 12 V After the 30 cycles, the onset potential for the electrooxidation of carbon monoxide became ca. 0.7 V on all the surfaces By STM, it was revealed that the steps were initially smooth and round, but as the potential scan continues, the steps became mom straight-like Small atomic-high islands of Pt was also bind by STM. It was suggested that after the cycling, atomic defects, such as kinks and adatoms, were diffused on the surface and trapped by other defects to make less-defected Pt surface.When the surface was treated with IR heating method, steps were more orderly arranged, but the electrooxidation activity was not lowered, showing the existence of atomic defects on the surface.The investigation open up the new insight into the electrooxidation of carbon monoxide.

为了模拟在燃料电池催化剂上发生的电化学反应，准备了PT（111），PT（10 10 9）和PT（20 19 19）表面，并研究了碳一氧化碳在高氯酸溶液中的电定位反应。通过电化学测量和扫描旋转显微镜（STM）。通过在氢火焰中退火并在纯水中淬火的单晶电极制品的赌注。在pt（111）和台面表面，一氧化碳的电氧化始于CA。 0.4 vs RHE，但是由于30个周期后，电势在阳极方向上移动，阳极方向移动，一氧化碳的电氧化的发作电位变成了CA。 STM的所有表面上的0.7 V，据透露，这些步骤最初是光滑的，但是随着潜在的扫描的继续，STM也被STM绑定而成，随着潜在的扫描的继续，这些步骤变成了妈妈直的小原子高岛。有人提出，在循环后，原子缺陷（例如扭结和adatoms）在表面扩散并被其他缺陷捕获以使较低的PT表面表面。当用IR加热方法处理表面时，步骤安排得更有序。 ，但没有降低电氧化活性，表明表面上存在原子缺陷。研究开辟了对一氧化碳电氧化的新见解。

项目成果

Changes in structure and electrochemical activity on Pt(111) and Pt(110) in CO-saturated solutions investigated by using S

使用 S 研究 Pt(111) 和 Pt(110) 在 CO 饱和溶液中结构和电化学活性的变化

• 发表时间: 2008
• 作者: S. Ashizawa;T. Abe;M. Wakisaka;J. Inukai;H. Uchida;M. Watanabe
• 通讯作者: M. Watanabe

電気化学STMを用いたCO飽和溶液中におけるPt(111)並びにPt(110)面の構造変化と反応性の解析

利用电化学 STM 分析 Pt(111) 和 Pt(110) 平面在 CO 饱和溶液中的结构变化和反应性

• 发表时间: 2008
• 作者: 芦澤修一;阿部陽隆;脇坂 暢;犬飼潤治;内田裕之;渡辺政廣
• 通讯作者: 渡辺政廣