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Graphene Oxide Sheathed ZIF-8 Microcrystals: Engineered Precursors of Nitrogen-Doped Porous Carbon for Efficient Oxygen Reduction Reaction (ORR) Electrocatalysis

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Thomas, M.
Illathvalappil, R.
Kurungot, S.
Nair, Balagopal
Mohamed, A.
Anilkumar, G.
Yamaguchi, T.
Hareesh, U.
Date
2016
Type
Journal Article

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Thomas, M. and Illathvalappil, R. and Kurungot, S. and Nair, B. and Mohamed, A. and Anilkumar, G. and Yamaguchi, T. et al. 2016. Graphene Oxide Sheathed ZIF-8 Microcrystals: Engineered Precursors of Nitrogen-Doped Porous Carbon for Efficient Oxygen Reduction Reaction (ORR) Electrocatalysis. ACS Applied Materials and Interfaces. 8 (43): pp. 29373-29382.
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ACS Applied Materials and Interfaces
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Nanochemistry Research Institute
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Abstract

© 2016 American Chemical Society.Nitrogen containing mesoporous carbon obtained by the pyrolysis of graphene oxide (GO) wrapped ZIF-8 (Zeolitic Imidazolate Frameworks-8) micro crystals is demonstrated to be an efficient catalyst for the oxygen reduction reaction (ORR). ZIF-8 synthesis in the presence of GO sheets helped to realize layers of graphene oxide over ZIF-8 microcrystals and the sphere-like structures thus obtained, on heat treatment, transformed to highly porous carbon with a nitrogen content of about 6.12% and surface area of 502 m2/g. These catalysts with a typical micromeso porous architecture exhibited an onset potential of 0.88Vvs RHE in a four electron pathway and also demonstrated superior durability in alkaline medium compared to that of the commercial Pt/C catalyst. The N-doped porous carbon derived from GO sheathed ZIF-8 core-shell structures could therefore be employed as an efficient electrocatalyst for fuel cell applications.