Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 19, Pages 16410-16417Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01209
Keywords
oxygen reduction reaction; oxygen vacancies; mesoporous nanosheets; NiCo2O4; hollow carbon spheres; density functional theory
Funding
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Key Research and Development Program of China [2016YFA0202604, 2016YFA0202603]
- National Natural Science Foundation of China [51579198, 51502227, 51521001]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Wuhan Morning Light Plan of Youth Science and Technology [2017050304010316]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
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Rationally generating oxygen vacancies in electrocatalysts is an important approach to modulate the electrochemical activity of a catalyst. Herein, we report a remarkable enhancement in oxygen reduction reaction (ORR) activity of NiCo2O4 supported on hollow carbon spheres (HCS) achieved through generating abundant oxygen vacancies within the surface lattice. This catalyst exhibits enhanced ORR activity (larger limiting current density of similar to-5.8 mA cm(-2)) and higher stability (similar to 90% retention after 40 000 s) compared with those of NiCo2O4/HCS and NiCo2O4. The results of X-ray photoelectron spectroscopy (XPS) characterizations suggest that the introduction of oxygen vacancies optimizes the valence state of active sites. Furthermore, we carried out density functional theory (DFT) calculations to further confirm the mechanism of oxygen vacancies, and results show that oxygen vacancies enhance the density of states (DOS) near the Fermi level, decrease work function, and lower the calculated overpotential of NiCo2O4.
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