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Catalytic deactivation of gold surface as a consequence of Prussian blue electrodeposition and removal |
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| Authors: | Pitchiah Esakki Karthik Chinnaiah Jeyabharathi Shanmugam Senthil Kumar Kanala Lakshmi Narasimha Phani |
| Institution: | 1. Nanoscale Electrocatalysis and Sensor Research Group, Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi, 630006, India |
| Abstract: | It is shown that the gold surface is catalytically deactivated and smoothened upon removal of the Prussian blue (PB)–gold nanocomposite formed on the gold surface. Atomic force microscopy proves surface smoothening after PB removal. The voltammetric responses of Ru(NH3)6Cl3 on the smoothened surface remain unaffected, but the reactions that involve multistep and inner-sphere electron transfer are affected on the smoothened surface as exemplified by hydroquinone, ferrous oxalate redox reactions, and oxygen reduction. These effects are attributed to catalytic deactivation as a consequence of removal of the active sites. It is shown that the gold surface is catalytically deactivated and smoothened upon removal of the Prussian blue (PB)–gold nanocomposite formed on the gold surface. Atomic force microscopy proves surface smoothening after PB removal. The voltammetric responses of Ru(NH3)6.Cl3 on smoothened surface remain unaffected, but the reactions that involve multistep and inner-sphere electron transfer are affected on the smoothened surface as exemplified by hydroquinone, ferrous oxalate redox reactions, and oxygen reduction. These effects are attributed to catalytic deactivation as a consequence of removal of the active sites. Graphical abstract shows the Au surface smoothening as a consequence of Prussian blue-gold nanocomposite (Au-PB) formation and removal |
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