Surface Reconstruction and Reactivity of Platinum鈥揑ron Oxide Nanoparticles

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• 作者：Paul N. Duchesne ; Guangxu Chen ; Xiaojing Zhao ; Nanfeng Zheng ; Peng Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：December 11, 2014
• 年：2014
• 卷：118
• 期：49
• 页码：28861-28867
• 全文大小：392K
• ISSN：1932-7455

文摘

The electrochemical stability of platinum鈥搃ron oxide nanoparticles has been studied using X-ray absorption spectroscopy. Samples were monitored for changes in their surface structure and elemental composition after electrochemical cycling in acidic media, which were then correlated with their electronic properties and a thorough analysis of their electrocatalytic activities. In addition to the observation of significant surface restructuring, greater Fe content following electrochemical treatment was found to be associated with higher half-wave potentials and specific current densities (up to 0.965 卤 0.001 V_RHE and 1.32 卤 0.03 脳 10^鈥? mA cm^鈥?, respectively). This work highlights the potential to improve the electrocatalytic activity of platinum鈥搃ron oxide nanoparticles by controlling the Fe content and platinum鈥搃ron bonding, and demonstrates the critical importance of characterizing these nanocatalysts both before and after use.