期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 17, 页码 6376-6384出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00591h
关键词
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资金
- National Natural Science Foundation of China [51473081, 21501105, 51503109]
- ARC Discovery Project [130104759]
- Fundamental Research Funds for the Central Universities [20152M058]
- State Key Lab of Multiphase Flow in Power Engineering
Developing earth-abundant, active and stable electrocatalysts which operate in two-electrode rechargeable metal-air batteries, including both oxygen evolution and reduction reactions (OER and ORR), is vital for renewable energy conversion in real application. Here, we demonstrate a three-dimensional (3D) bifunctional nanoaerogel electrocatalyst that exhibits good electrocatalytic properties for both OER and ORR. This material was fabricated using a scalable and facile method involving the pyrolysis of (Ni,Co)/CNT alginate hydrogels derived from sustainable seaweed biomass after an ion exchange process. The bifunctionality for oxygen electrocatalysis as shown by the OER-ORR potential difference (DE, the OER and ORR potentials are taken at the current densities of 10 mA cm(-2) and (-3) mA cm(-2) in 0.1 M KOH, respectively) could be reduced to as low as 0.87 V, comparable to the state-of-the-art non-noble bifunctional catalysts. The good performance was attributed to the ternary Ni/NiO/NiCo2O4 catalytic center for charge transfer and 3D hierarchical mesoporous hybrid framework for efficient mass transport. More importantly, the Zn-air battery fabricated with the hybrid nanoaerogel as a bifunctional electrocatalyst displays very high energy efficiency (58.5%) and long-term stability. Prospectively, our present work may pave a new way to develop earth-abundant and low cost high-performance bifunctional electrocatalysts for rechargeable metal-air batteries.
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