Heterostructure and Oxygen Vacancies Promote NiFe2 O4 /Ni3 S4 toward Oxygen Evolution Reaction and Zn-Air Batteries.
Chem Asian J
; 15(21): 3568-3574, 2020 Nov 02.
Article
em En
| MEDLINE
| ID: mdl-32929867
ABSTRACT
Developing high-performance catalysts for oxygen evolution reaction (OER) is critical for the widespread applications of clean and sustainable energy through electrochemical devices such as zinc-air batteries and (photo)electrochemical water splitting. Constructing heterostructure and oxygen vacancies have demonstrated great promises to boost the OER performance. Herein, we report a facile strategy to fabricate hetero-structured NiFe2 O4 /Ni3 S4 nanorods, where NiFe2 O4 can be derived from Fe-based metal-organic frameworks (MOFs). The NiFe2 O4 /Ni3 S4 catalyst exhibited excellent OER performance, evidenced by an overpotential value of 357â
mV at the current density of 20â
mA cm-2 , and a small Tafel slope of 87.46â
mV dec-1 in 1 M KOH, superior to the benchmark IrO2 catalyst. Moreover, NiFe2 O4 /Ni3 S4 outperformed with regard to long-term durability for OER than IrO2 . Such outstanding OER performance is mainly accounted by the interface between NiFe2 O4 and Ni3 S4 , and the presence of rich oxygen vacancies. When employed as air-cathode in zinc-air batteries, the NiFe2 O4 /Ni3 S4 decorated battery had a high round-trip efficiency of 62.1% at 10â
h, and possessed long-term stability of >50â
h. This study may pave the way for fabricating non-noble-metal-based cost-effective, efficient and durable electrocatalysts for OER, zinc-air batteries, and beyond.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article