Carbon-based nanostructures vertically arrayed on layered lanthanum oxycarbonate as highly efficient catalysts for oxygen reduction reaction.

Author(s) Bai, L.; Liu, J.; Gu, W.; Song, Y.; Wang, F.
Journal ACS Appl Mater Interfaces
Date Published 2019 Apr 09

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 Co-based zeolitic imidazolate framework (ZIF-67) that epitaxially grows on layered lanthanum oxycarbonate (La2O2CO3) as a structure-oriented template, followed by a pyrolysis at 800 °C. These synthesized carbon-based nanostructures show a well-defined dodecahedron morphology and vertically array on the template surface. In 0.1M 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 a commercial Pt/C (20 wt. %, Pt). The significantly improved ORR performance can be ascribed the increased Co-Nx level, high specific surface area and graphitization of the pyrolytic carbon, caused by the introducing of the La2O2CO3 phase into the composite catalyst. Therefore, using La2O2CO3 as template may be a smart synthetic strategy for MOF-derived nanocarbons with controlled morphology and composition for energy storages and conversions.

DOI 10.1021/acsami.8b20619
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2019.

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