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Nanoscale

Hierarchical cobalt-nitride and -oxide co-doped porous carbon nanostructures for highly efficient and durable bifunctional oxygen reaction electrocatalysts.


PMID 28994435

Abstract

Here we report the preparation of hollow microspheres with a thin shell composed of mixed cobalt nitride (Co-N) and cobalt oxide (Co-O) nanofragments encapsulated in thin layers of nitrogen-doped carbon (N-C) nanostructure (Co-N/Co-O@N-C) arrays with enhanced bifunctional oxygen electrochemical performance. The hybrid structures are synthesized via heat treatment of N-doped hollow carbon microspheres with cobalt nitrate, and both the specific ratio of these precursors and the selected annealing temperature are found to be the key factors for the formation of the unique hybrid structure. The as-obtained product (Co-N/Co-O@N-C) presents a large specific surface area (493 m