Anisotropic N-Graphene-diffused Co3 O4 nanocrystals with dense upper-zone top-on-plane exposure facets as effective ORR electrocatalysts

Scientific Reports
D HassenS A El-Safty

Abstract

We provide strong evidence of the effectiveness of homogenously self-propelled particle-in-particle diffusion, interaction and growth protocol. This technique was used for one-pot synthesis of novel nitrogen-graphene oxide (N-GO)/Co3O4 nanocrystals with cuboid rectangular prism-shaped nanorods (NRs) along {110}-plane and truncated polyhedrons with densely-exposed, multi-facet sites along {311} and {111} planes. These hierarchal nanocrystals create electrode catalyst patterns with vast-range accessibility to active Co2+ sites, a vascular system for the transport and retention of captured O2 molecule interiorly, and low adsorption energy and dense electron configuration surfaces during the oxygen reduction reaction (ORR). The superior electrocatalytic ORR activity of the N-GO/Co3O4 polyhedron nanocrystals in terms of electrochemical selectivity, durability and stability compared with NRs or commercial Pt/C catalysts confirms the synergetic contribution of multi-functional, dense-exposed, and actively topographic facets of polyhedrons to significantly activate the catalytic nature of the catalyst. Our findings show real evidence, for the first time that not only the large number of catalytically active Co2+ cations at the top surf...Continue Reading

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Citations

Mar 7, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Mohamed S SelimAhmed Elmarakbi
Dec 15, 2018·Advanced Materials·Wenping YangHuan Pang
Mar 2, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Nesreen A FatthallahMohamed A Shenashen

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Methods Mentioned

BETA
scanning electron microscopy

Software Mentioned

BIOVIA Materials Studio

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