Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 54, Pages 14522-14530Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802898
Keywords
Co3O4; nanosheet arrays; oxygen evolution reaction; oxygen reduction reaction; quantum effects
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Funding
- National Natural Science Foundation of China [21471076, 51172106]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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In terms of promising candidates for high-performance fuel cells and water splitting electrocatalysts, two-dimensional (2D) materials refer to a class of materials with high electrical conductivity along 2D conducting channels and possessing abundant active sites in the form of surface atoms and edge sites. Herein, we report an ammonia-modulated method for the synthesis of nanosized bimetallic ZnCo-ZIF, and owing to quantum effects, the nanosized ZnCo-ZIF can be transformed into novel 2D nanosheet arrays, which can be used as a bifunctional electrocatalyst. The size of the ZnCo-ZIF crystals can be controlled to less than 10nm by increasing the ammonia amount. The products from the nanosized particles through calcination have a distinct structure from the microsized nanoparticles owing to quantum effects and appear to be well-aligned 2D mono-crystalline Co3O4-embedded nitrogen-doped porous carbon nanosheet arrays (2D-MCo3O4-NCNAs). These novel 2D nanosheet arrays lead to large active surface areas, enhanced mass/charge transport capability, numerous active sites, and strong structure stability. When used as bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), the 2D-MCo3O4-NCNAs exhibit superior ORR activity as well as efficient OER activity in alkaline electrolyte, in comparison to the state-of-the-art precious metal catalysts.
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