Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 18, Pages 16452-16460Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20619
Keywords
zeolitic imidazolate framework-67; La2O2CO3; carbon-based nanostructures; oxygen reduction reaction; electrocatalytic activity
Funding
- National Natural Science Funds of China [51572013]
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Controllable pyrolysis of collapsible metal-organic frameworks (MOFs) into carbon-based nanostructures without obvious collapse and aggregation is of importance for the fabrication of well catalytic active and durable carbon-based catalysts for the oxygen reduction reaction (ORR). Herein, we fabricate morphology-controlled carbon-based nanostructures derived from the Co-based zeolitic imidazolate framework (ZIF-67) that epitaxially grows on layered lanthanum oxycarbonate (La2O2CO3) as a structure-oriented template, followed by pyrolysis at 800 degrees C. These synthesized carbon-based nanostructures show a well-defined dodecahedron morphology and vertical array on the template surface. In 0.1 M KOH solution, the ORR activity and durability of the carbon-based nanostructures are not only much higher than those obtained by pyrolytic carbons derived from pure ZIF-67 but also exceed commercial Pt/C (20 wt %, Pt). The significantly improved ORR performance can be ascribed to the increased Co-N-x level, high specific surface area, and graphitization of the pyrolytic carbon, caused by the introduction of the La2O2CO3 phase into the composite catalyst. Therefore, using La2O2CO3 as the template may be a smart synthetic strategy for MOF-derived nanocarbons with a controlled morphology and composition for energy storages and conversions.
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