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Antimony-doped graphene nanoplatelets

Nature Communications2015Vol. 6(1), pp. 7123–7123

Citations Over TimeTop 10% of 2015 papers

In‐Yup Jeon, Min Choi, Hyun‐Jung Choi, Sun‐Min Jung, Minjung Kim, Jeong‐Min Seo, Seo‐Yoon Bae, Seonyoung Yoo, Guntae Kim, Hu Young Jeong, Noejung Park, Jong‐Beom Baek

Abstract

Heteroatom doping into the graphitic frameworks have been intensively studied for the development of metal-free electrocatalysts. However, the choice of heteroatoms is limited to non-metallic elements and heteroatom-doped graphitic materials do not satisfy commercial demands in terms of cost and stability. Here we realize doping semimetal antimony (Sb) at the edges of graphene nanoplatelets (GnPs) via a simple mechanochemical reaction between pristine graphite and solid Sb. The covalent bonding of the metalloid Sb with the graphitic carbon is visualized using atomic-resolution transmission electron microscopy. The Sb-doped GnPs display zero loss of electrocatalytic activity for oxygen reduction reaction even after 100,000 cycles. Density functional theory calculations indicate that the multiple oxidation states (Sb(3+) and Sb(5+)) of Sb are responsible for the unusual electrochemical stability. Sb-doped GnPs may provide new insights and practical methods for designing stable carbon-based electrocatalysts.

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