Constructing heterostructures of covalent organic frameworks (COFs) and metal organic frameworks (MOFs) has gained great attention for various applications due to their well-defined skeletons, ordered porosity and designable functions. Herein, the core-shell structured carbon frameworks, which contain high density active sites of uniform Co nanoparticles and atomic Co-N4, were realized by direct pyrolysis of TP-BPY-COF@ZIF-67. The thin COF-shell not only prevented the collapse and aggregation of ZIF-67 but also promoted the formation of mesopores for mass transport, and enhanced the graphitization degree for conductivity. The resultant COF@ZIF800exhibited bifunctional catalytic performance for the ORR and HER, in which the half-wave potential for ORR was 0.85 V in 0.1 M KOH and the over-potential for HER was 0.16 V at 10 mA cm−2in 1 M KOH were achieved. This work sheds light on exploring COFs and MOFs in electrochemical energy storage and conversion systems.
ASJC Scopus subject areas
- Chemistry (all)
- Renewable Energy, Sustainability and the Environment
- Materials Science (all)