CSIR – National Institute for Interdisciplinary Science and Technology (NIIST)

Council of Scientific & Industrial Research (CSIR), Govt.Of India Thiruvananthapuram.

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

Minju Thomas, Rajith Illathvalappil, Sreekumar Kurungot, Balagopal N. Nair, Abdul Azeez Peer Mohamed, Gopinathan M. Anilkumar*, Takeo Yamaguchi, and U. S. Hareesh*

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 realise 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 micro-meso 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

ACS Appl. Mater. Interfaces

Link: http://pubs.acs.org/doi/abs/10.1021/acsami.6b06979