Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 20, Pages 6247-6253Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202005112
Keywords
active sites; batteries; hollow carbons; hydrothermal; zinc– air batteries
Categories
Funding
- Natural Science Funds of China [51872020]
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In this study, well-defined N-doped hollow carbons (NHCs) were successfully synthesized using an environmentally friendly ammonia-based hydrothermal synthesis method, with easily tunable shell thickness and excellent performance for oxygen reduction reaction. The enhanced battery performance can be attributed to the curvature-activated N-C moieties on the hollow carbon surface, proving to be the main active sites for ORR as evidenced by DFT calculations.
Metal-free carbons have been regarded as one of the promising materials alternatives to precious-metal catalysts for oxygen reduction reaction (ORR) due to their high activity and stability. In this paper, well-defined N-doped hollow carbons (NHCs) are firstly synthesized by using an ammonia-based hydrothermal synthesis that is environmentally friendly and suitable for mass production in industry and a commercial black carbon as raw material. Moreover, the shell thickness of the NHCs can be easily tuned by this hydrothermal strategy. Zn-air battery test results reveal shell thickness-dependent activity and durability for ORR over the NHCs, which exceeds that obtained by commercial Pt/C (20 wt %). The enhanced battery performance can be attributed to the curvature-activated N-C moieties on the hollow carbon surface, which served as the main active sites for ORR as evidenced by DFT calculations. The proposed approach may open a way for designing curved hollow carbons with high graphitization degree and dopant nitrogen level for metal-air batteries or fuel cells.
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