Journal
COMPOSITES PART B-ENGINEERING
Volume 231, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109589
Keywords
Nanoemulsion assembly; Co2P/NP-C; Oxygen reduction reaction; Zinc-air battery; High capacity
Funding
- National Natural Science Foundation of China [52102100]
- Natural Science Foundation of Jiangsu Province [BK20181469]
- Key Research and Development Pro-gram (Social Development) of Zhenjiang City [SH2019009]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110035]
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The Co2P/NP-C catalyst synthesized using an altered nanoemulsion assembly approach exhibits excellent ORR electrocatalytic activity for metal-air batteries, with high half-wave potential and limiting current density comparable to commercial Pt/C. This performance is attributed to the in-situ formed Co2P nanoparticles and N, P heteroatoms in the carbon matrix, providing sufficient catalytic active sites and efficient mass/charge transport.
The design of highly active and stable non-noble metal catalysts for oxygen reduction reaction (ORR) is indispensable for metal-air batteries. Herein, an altered nanoemulsion assembly approach is developed to synthesize fine Co2P dispersed in N, P doped carbon nanospheres (Co2P/NP-C) as prominent ORR electrocatalyst for zinc-air batteries (ZABs). A high half-wave potential of 0.81 V vs. RHE and a limiting current density of 4.54 mA cm(-2) is exhibited for C(o)2P/NP-C, which are comparable with those of commercial Pt/C, indicating excellent ORR electrocatalytic activity. Moreover, a big peak power density of 152.4 mW cm(-2) and a high gravimetric energy density of 1286.0 Wh kg(Zn)(-1) are delivered for the assembled primary ZAB using Co2P/NP-C as cathode catalyst with a high open circuit voltage of 1.448 V. The excellent performance should be attributed to the in-situ formed Co2P nanoparticles and N, P heteroatoms in nanospherical carbon matrix with high accessible surface area, which both provide sufficient catalytic active sites and ensure efficient mass/charge transport in ORR process.
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