Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 39, Pages 18877-18883Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta08337a
Keywords
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Funding
- NSFC [51702284]
- Fundamental Research Funds for the Central Universities [112109*172210171]
- Startup Foundation for Hundred-Talent Program of Zhejiang University [112100-193820101/001/022]
- Australian Research Council
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Development of highly efficient and stable zeolitic imidazolate framework (ZIF) nanosheets has recently received growing interest as alternatives to noble-metal electrocatalysts towards the oxygen evolution reaction (OER). Herein, we develop a novel vapor-phase hydrothermal growth strategy for in situ synthesis of ultrathin cobalt-based zeolitic imidazolate framework (ZIF-67)nanosheets grown on the surface of Co(OH)(2) nanosheets vertically aligned on electrochemically exfoliated graphene (EG) foil. Ultrathin ZIF-67 nanosheets with a thickness of similar to 5 nm are uniformly coated on the surface of a Co(OH)(2) nanosheet array to form a 2D core-shell structure. Benefitting from the strong coupling and synergistic effects, the resulting EG/Co(OH)(2)/ZIF-67 hybrid exhibits excellent catalytic activity for the OER in alkaline electrolytes, which only requires an overpotential of 280 mV to attain a current density of 10 mA cm(-2) with a low Tafel slope of 63 mV dec(-1) and high stability. Such high OER performance for the EG/Co(OH)(2)/ZIF-67 hybrid is superior to that of commercial Ir/C catalysts and even better than that of all previously reported ZIF-based OER electrocatalysts. In situ Raman analyses demonstrate that under OER conditions, the Co-O species are converted into Co-OOH groups, which are responsible for the excellent catalytic activity of EG/Co(OH)(2)/ZIF-67 in the OER.
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