Abstract
AbstractDeveloping bifunctional non‐precious metal electrocatalysts of superior reactivity and durability is essential. Herein, we report a class of phthalocyanine‐based covalent organic frameworks as self‐sacrificial precursors derived Co‐based hybrid electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The fabricated Co‐COFs/CNT‐700 catalysts displayed highly efficient ORR properties with a half‐potential of 0.83 V, while its half‐wave potential in alkaline solution at a current density of 10 mA cm−2 is 1.70 V in the OER test, reflecting exceptional OER activity. Moreover, zinc‐air batteries assembled with Co‐COFs/CNT‐700 catalysts exhibit a marginally higher power density (114 mW cm2) than traditional Pt/C−IrO2 batteries in an air atmosphere, along with an enhanced cycling stability (5.1 % potential loss after 65 h). This work may pave a facile and efficient approach for fabricating electrocatalytic materials with controllably introduced metals and heteroatoms.
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