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Hollow Polyhedral Arrays Composed of a Co3O4 Nanocrystal Ensemble on a Honeycomb-like Carbon Hybrid for Boosting
Xuan Kuang1, Rui Kuang2, Yanfang Dong1
1Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , China.
Abstract:
We synthesize hollow polyhedral arrays composed of honeycomb-like nanosheets of Co3O4 nanocrystals imbedded on carbon quantum dots (CQDs)- and nitrogen-codoped carbon matrix via a facile in situ air oxidation pyrolysis for CQDs-incorporated metal-organic framework polyhedral arrays. The function of CQDs hollowing and forming porous nanosheet shells was found. The resulting hierarchical architecture displays excellent oxygen evolution reaction activity with a low overpotential of 301 mV to drive 100 mA cm-2 in 1.0 M KOH and long-playing durability in oxygen evolution. The high performance can be ascribed to its highly dispersed Co3O4 nanocrystals, CQDs and nitrogen codoping, internal cavities, and hierarchical pore system.
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