Insights on the Electrochemical Atomic Force Microscopic Catalytic Oxygen Reduction on Tip Guided Platinum Particle Deposits

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• 作者：Srikanth Kolagatla ; Palaniappan Subramanian ; Alex Schechter ; ^{salex@ariel.ac.il" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Atomic Force Microscopy ; Platinum Particles ; Electrodeposition ; Oxygen Reduction ; Catalyst
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：217
• 期：Complete
• 页码：100-107
• 全文大小：2357 K

文摘

Oxygen reduction reaction (ORR) is traditionally studied on electrodes of large surface covered with a layer of catalysts. However it is important to understand the oxygen reduction reaction occurring on separated catalytic metal particles of different morphology, size and also to probe the hydrogen peroxide byproduct, if any, generated during the reduction process. Therefore, it is necessary to produce metal particles under controlled electrochemical conditions that will allow concomitant high resolution imaging. Herein, we have used a relatively less explored technique- ‘Electrochemical Atomic Force Microscopy (EC-AFM)’ to do controlled electrodeposition and subsequently image the catalytic platinum particles deposited on conductive carbon substrates on a nanometric scale. AFM tip electrodes were used to direct the deposition of platinum particles while simultaneously scanning the substrate. We have presented the effect of deposition parameters including tip scan rate, platinum salt concentration and electrodeposition time on the nature of platinum deposits and oxygen reduction activity of these deposits.