Graphene-Encapsulated Co9 S8 Nanoparticles on N,S-Codoped Carbon Nanotubes: An Efficient Bifunctional Oxygen Electrocatalyst.
ChemSusChem
; 12(14): 3390-3400, 2019 Jul 19.
Article
em En
| MEDLINE
| ID: mdl-30895738
ABSTRACT
An inexpensive and efficient bifunctional electrocatalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is central to the rechargeable zinc-air battery. Herein, a nanohybrid, in which N,S-codoped carbon nanotubes were decorated with Co9 S8 nanoparticles encapsulated in porous graphene layers, was fabricated by a one-step heat-treatment process. The N,S dopant species were the major active sites for the ORR, and Co9 S8 nanoparticles were mainly responsible for the OER. Compared with commercial 20â
wt % Pt/C and Ir/C electrocatalysts, this nanohybrid exhibited a comparable ORR half-wave potential (0.831â
V vs. reversible hydrogen electrode) and OER potential (1.591â
V at 10â
mA cm-2 ), better long-term stability in an alkaline medium, and a narrower potential gap (0.76â
V) between ORR and OER. Furthermore, as air electrode of the rechargeable zinc-air battery, it delivered a low charge-discharge voltage gap (0.65â
V at 5â
mA cm-2 ), high open-circuit potential (1.539â
V), good specific capacity (805â
mA h g - 1 Zn at 5â
mA cm-2 ), and excellent cycling stability (48â
h), superior to those of commercial Pt/C and Ir/C catalysts, and thus showed promise for applications in renewable energy conversion devices.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
ChemSusChem
Ano de publicação:
2019
Tipo de documento:
Article