Issue 25, 2016

Optimized nitrogen-doped carbon with a hierarchically porous structure as a highly efficient cathode for Na–O2 batteries

Abstract

Development of an efficient air cathode for metal–air batteries composed of an element that is abundant on earth is a scientific and technical challenge. Here, nitrogen (N)-doped carbon cathodes were prepared using two conventional doping methods, namely ammonia activation (ammoxidation) and introduction of an N-containing precursor. Interestingly, the introduction of N-containing precursors to prepare the N-doped carbon material not only gave a different pore distribution with increased surface area but also maintained considerable N content, unlike the use of the ammoxidation method – thus greatly enhancing the catalytic activity (low overpotential) and improving the discharge capacity (6905 mA h g−1) and cycle life (from 8 to 66 cycles) in sodium–oxygen batteries compared with the pure carbon material. This study also stresses the importance of adopting the optimized synthesis method to prepare the N-doped carbon cathode.

Graphical abstract: Optimized nitrogen-doped carbon with a hierarchically porous structure as a highly efficient cathode for Na–O2 batteries

Supplementary files

Article information

Article type
Paper
Submitted
05 Apr 2016
Accepted
25 May 2016
First published
25 May 2016

J. Mater. Chem. A, 2016,4, 10008-10013

Optimized nitrogen-doped carbon with a hierarchically porous structure as a highly efficient cathode for Na–O2 batteries

J. Ma and X. Zhang, J. Mater. Chem. A, 2016, 4, 10008 DOI: 10.1039/C6TA02793H

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