Hierarchical core–shell Co2N/CoP embedded in N, P-doped carbon nanotubes as efficient oxygen reduction reaction catalysts for Zn-air batteries

Yao, C., Li, J., Zhang, Z., Gou, C., Zhang, Z., Pan, G. ORCID: 0000-0003-0920-3018 and Zhang, J., 2022. Hierarchical core–shell Co2N/CoP embedded in N, P-doped carbon nanotubes as efficient oxygen reduction reaction catalysts for Zn-air batteries. Small: 2108094. ISSN 1613-6810

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Abstract

Projecting a cost-effective and highly efficient electrocatalyst for the oxygen reaction reduction (ORR) counts a great deal for Zn-air batteries. Herein, a hierarchical core–shell ORR catalyst (Co2N/CoP@PNCNTs) is developed by embedding cobalt phosphides and/or cobalt nitrides as the core into N, P-doped carbon nanotubes (PNCNTs) as the shell via one-step carbonization, nitridation, and phosphorization of pyrolyzing Co-MOF precursor. The globally N, P-doped structure of Co2N/CoP@PNCNTs demonstrates an outstanding electrocatalytic activity in the alkaline solution with the onset and half-wave potentials of 1.07 and 0.85 V respectively. Moreover, a Zn-air battery assembled from Co2N/CoP@PNCNTs as the air cathode delivers an open circuit potential of 1.49 V, a maximum power density of 151.1 mW cm−2 and a specific capacity of 823.8 mAh kg−1. It is reflected that Co2N/CoP@PNCNTs provides a long-term durability with a slight decline of 15 h in the chronoamperometry measurement and an excellent charge–discharge stability with negligible voltage decay for 150 h at 10 mA cm−2 in Zn-air batteries. The results reveal that Co2N/CoP@PNCNTs has superiority over most Co-Nx-C or CoxP@C catalysts reported so far. The excellent catalytic properties and stability of Co2N/CoP@PNCNTs derive from synergistic effects between Co2N/CoP and mesoporous N, P-doped carbon nanotubes.

Item Type: Journal article
Publication Title: Small
Creators: Yao, C., Li, J., Zhang, Z., Gou, C., Zhang, Z., Pan, G. and Zhang, J.
Publisher: Wiley
Date: 18 April 2022
ISSN: 1613-6810
Identifiers:
NumberType
10.1002/smll.202108094DOI
1539687Other
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Jonathan Gallacher
Date Added: 25 Apr 2022 11:49
Last Modified: 25 Apr 2022 11:49
URI: http://irep.ntu.ac.uk/id/eprint/46181

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