Cactus-like NiCo2S4@NiFe LDH hollow spheres as an effective oxygen bifunctional electrocatalyst in alkaline solution

•A novel cactus-like NiCo2S4@NiFe LDH hollow sphere has been developed.•The strong electronic interactions of heterointerface greatly enhance the electronic transfer.•The outer NiFe LDH is capable of protecting inner NiCo2S4 to reduce its corrosion.•The NiCo2S4@NiFe LDH achieves a small potential ga...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2021-06, Vol.286, p.119869, Article 119869
Main Authors: Feng, Xueting, Jiao, Qingze, Chen, Wenxing, Dang, Yanliu, Dai, Zheng, Suib, Steven L., Zhang, Jiatao, Zhao, Yun, Li, Hansheng, Feng, Caihong
Format: Article
Language:English
Subjects:
Alkaline electrolyte
Cactus-like hollow spheres
Catalysts
Chemical reduction
Electrocatalysts
Fuel cells
Heterostructures
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Intermetallic compounds
Iron compounds
Nanostructure
Nanotechnology
Nanowires
Nickel compounds
NiCo2S4@NiFe LDH
Oxygen
Oxygen evolution reaction
Oxygen evolution reactions
Oxygen reduction reaction
Oxygen reduction reactions
Stability tests
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Summary:•A novel cactus-like NiCo2S4@NiFe LDH hollow sphere has been developed.•The strong electronic interactions of heterointerface greatly enhance the electronic transfer.•The outer NiFe LDH is capable of protecting inner NiCo2S4 to reduce its corrosion.•The NiCo2S4@NiFe LDH achieves a small potential gap of only 0.667 V in 0.1 M KOH. The high-performance non-precious electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are crucial to the practical application of fuel cells and metal-air batteries. Herein, a novel cactus-like NiCo2S4@NiFe LDH hollow sphere assembled by one-dimensional (1D) NiFe LDH nanowires and two-dimensional (2D) NiFe LDH nanosheets on the NiCo2S4 hollow spheres is prepared by a facile hydrothermal method. The outer NiFe LDH nanowires and NiFe LDH nanosheets can effectively suppress the collapse and corrosion of inner NiCo2S4 hollow structure during long-term stability tests. The integration of the effective OER electrocatalyst NiFe LDH into NiCo2S4 to form heterostructures, as well as the strong electronic interaction between NiCo2S4 and NiFe LDH, can greatly boost both ORR and OER activities. Due to the above merits, the NiCo2S4@NiFe LDH achieves remarkably a small potential gap (ΔE = Ej=10-E1/2) of only 0.667 V. This work offers a facile strategy to design efficient catalysts with heterostructures.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119869