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Journal of materials chemistry. A, Materials for energy and sustainability, 2022-01, Vol.1 (3), p.156-1513
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Interface engineering has been proved to be an efficient strategy for boosting electrocatalytic performance and has attracted increasing interest in past few decades. Herein, Co
3
O
4
@LaCoO
3
heterojunctions with abundant oxygen vacancies, subtle lattice distortion, and atomic-level coupled interfaces were synthesized in a nonequilibrium stoichiometric ratio. The synthesized product shows exceptional bifunctional catalytic activity and robust stability in the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). As demonstrated by high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure spectroscopy (XAFS), the heterojunction structure between Co
3
O
4
and LaCoO
3
was formed, which is beneficial for its electrocatalytic properties. The enhanced catalytic capacity is also evidenced by the results of experimental measurements and first-principles calculations. Furthermore, the Co
3
O
4
@LaCoO
3
assembled Zn-air batteries (including routine liquid batteries and flexible solid-type batteries) exhibit a large peak power density, high open-circuit potential, and a long-term cycle life. This work affords rational design strategies of spinel@perovskite dual-phase oxides and provides potential applications in wearable electronic devices.
The interfacial synergy of Co
3
O
4
@LaCoO
3
provides fast charge transfer paths and kinetics in the oxide/solution interface, which exhibit exceptional bifunctional catalytic activity and robust stability for Zn-air batteries.