A general approach for hierarchically porous metal/N/C nanosphere electrocatalysts: Nano-confined pyrolysis of: In situ-formed amorphous metal-ligand complexes

Article abstract of DOI:10.1039/d0ta07029g

A nano-confined pyrolysis approach was developed for constructing highly nitrogen-doped hierarchically porous metal/N/C nanospheres (typically Fe/N/C-HP). Hierarchically porous silica nanospheres (NKM-5) were used as a hard template, and an amorphous Fe/Zn-(MeIm)2 complex was employed as a carbon and nitrogen source. During the pyrolysis process, first, the molten Fe/Zn-(MeIm)2 complex diffused into hierarchically porous tunnels of NKM-5. Secondly, the interface confinement effect of nanopores in NKM-5 could effectively immobilize nitrogen to coordinate with iron atom, prevent the aggregation of Fe-based species and form single-Atom Fe sites. After the silica template was removed, the catalyst exhibited a hierarchically porous structure and uniform spherical morphology. This hierarchically porous structure of Fe/N/C-HP can enhance mass transport/electron transfer and greatly improve the accessibility of Fe/N/C sites. As a result, the Fe/N/C-HP catalyst exhibits excellent oxygen reduction performance with a half-wave potential (E1/2) of 0.90 V in alkaline media and 0.78 V in acidic media. A primary Zn-Air battery with Fe/N/C-HP as the cathode catalyst exhibits a large peak power density of 181 mW cm-2 and discharge stability. This nano-confined pyrolysis of amorphous M/Zn-(MeIm)2 complex is a general method to construct a hierarchically porous M/N/C (M = Fe, Co, Cu, Mn and Ni) electrocatalyst with well-defined morphology. This journal is

Full text of DOI:10.1039/d0ta07029g

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Journal of
Materials Chemistry A
Materials for energy and sustainability
Accepted Manuscript
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Chen, P. Sun and T. Chen, J. Mater. Chem. A, 2020, DOI: 10.1039/D0TA07029G.
Volume
Number 12
March 2018
Pages 4883-5230
6
This is an Accepted Manuscript, which has been through the
Royal Society of Chemistry peer review process and has been
accepted for publication.
28
Journal of
Materials Chemistry A
Materials for energy and sustainability
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ISSN 2050-7488
COMMUNICATION
Zhenhai Wen et al.
An electrochemically neutralized energy-assisted low-cost
acid-alkaline electrolyzer for energy-saving electrolysis
hydrogen generation
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Page 4 of 11
View Article Online
DOI: 10.1039/D0TA07029G
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DOI: 10.1039/D0TA07029G

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Journal of Materials Chemistry A
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DOI: 10.1039/D0TA07029G

Journal of Materials Chemistry A
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Page 9 of 11
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Page 10 of 11
View Article Online
DOI: 10.1039/D0TA07029G
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Page 11 of 11
Journal of Materials Chemistry A
View Article Online
DOI: 10.1039/D0TA07029G