Enhanced electrocatalytic activity and stability of platinum,gold, and nickel oxide nanoparticles-based ternary catalyst for formic acid electro-oxidation |
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Authors: | Gumaa A El-Nagar Ahmad M Mohammad |
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Affiliation: | 1. Chemistry Department, Faculty of Science, Cairo University, Cairo 12613, Egypt;2. Department of Chemical Engineering, Faculty of Engineering, The British University in Egypt, Cairo 11837, Egypt |
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Abstract: | The global interest to realize and commercialize the direct formic acid fuel cells has motivated the development of efficient and stable anodes for the formic acid (FA) electro-oxidation (FAO). In this investigation, a ternary catalyst composed of Pt nanoparticles (PtNPs), Au nanoparticles (AuNPs) and nickel oxide nanoparticles (nano-NiOx), all were sequentially electrodeposited onto the surface of a glassy carbon (GC) electrode, was recommended for this reaction. The surface morphology investigation revealed the deposition of grain-shaped PtNPs (25 nm average particle size), and flower-shaped nanospheres (less than 60 nm average particle size) of AuNPs and nano-NiOx. Interestingly, the ternary modified NiOx-Au-Pt/GC electrode has shown an outstanding electrocatalytic activity towards the direct FAO, concurrently with a complete suppression for the indirect route. It further exhibited excellent stability that extended for 7 h of continuous electrolysis. While PtNPs furnished a suitable base for FA adsorption, AuNPs played a significant role to interrupt the contiguity of the Pt surface sites, which is necessary for CO poisoning. On the other hand, nano-NiOx acted as a catalytic mediator facilitating the charge transfer of FAO and the oxidative removal of CO at a lower potential. |
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Keywords: | Electrocatalysis Gold nanoparticles Platinum nanoparticles Nickel oxide nanoparticles Direct formic acid fuel cells Third body |
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