The morphology dependent electrocatalytic activity of Ir nanostructures towards oxygen reduction

Literature Information

Publication Date 2014-06-27
DOI 10.1039/C4CP01882F
Impact Factor 3.676
Authors

Kalapu Chakrapani, Srinivasan Sampath


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Abstract

Iridium nanostructures with different morphologies are synthesized by a simple, environmentally friendly approach in aqueous media under mild conditions. The morphology dependent electrocatalytic activity of Ir nanochains and nanoparticles towards oxygen reduction reaction (ORR) has been demonstrated in both acidic and alkaline media. Comparative electrochemical studies reveal that nanochains exhibit significantly enhanced ORR activities in both acidic and alkaline media as compared with nanoparticles, as a result of the continuous structure of interconnected particles. The mechanism of oxygen reduction on Ir nanostructures predominantly follows a four-electron pathway in alkaline and acidic solutions. Excellent stability and good selectivity towards methanol tolerance are reported.

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