Abstract
Nanosized linked carbon bubbles were precisely in situ synthesized on graphene microfolds for oxygen reduction reaction. Bimetal alloy and low temperature were proved to be the key factors to shape the carbon-based derivates into bubbles. Carbon-based microassemblies (CMs) have attracted significant attention in numerous applications due to their unique hierarchical structures and delicate building blocks, especially when hollow carbon spheres (HCSs) are reasonably introduced into the construction. Herein, a new design for novel HCSs-combined CMs is proposed. Remarkably, the HCSs are linear carbon bubbles linked one-by-one, arranging into necklaces decorating on the graphene microfolds. Detailed thermal analysis confirm that high temperatures straighten the linked carbon bubbles into bamboo-like carbon nanofibers, evidently due to the attenuation of doping degree. Benefiting from the abundant active sites of carbon bubbles, the obtained CMs exhibit satisfactory electrocatalytic activity for oxygen reduction reactions. This work establishes a bridge to precisely control the synthesis of carbon-based hierarchical architectures.
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