Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 64, Issue -, Pages 9-13Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2015.12.016
Keywords
Oxygen reduction; Pd nanocubes; Supported catalysts; Electrocatalysis
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Funding
- Estonian Ministry of Education and Research [IUT20-16]
- Estonian Research Council [9323]
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Carbon-supported Pd nanocubes with the size of 30, 10 and 7 nm were prepared and their electrocatalytic activity towards the oxygen reduction reaction (ORR) in alkaline solution was studied. For comparison carbon-supported spherical Pd nanoparticles and commercial Pd/C catalyst were used. The catalysts were characterised by transmission electron microscopy, electro-oxidation of carbon monoxide and cyclic voltammetry and the ORR activity was evaluated using the rotating disk electrode method. The ORR on all studied Pd/C catalysts proceeded via four-electron pathway where the rate-limiting step was the transfer of the first electron to O-2 molecule. The specific activity of Pd nanocubes was more than two times higher than that of spherical Pd nanoparticles and increased with increasing the particle size. (C) 2015 Elsevier B.V. All rights reserved.
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