▎ 摘　　要

It is of great and increasing interest to explore high-performance and low-cost bifunctional electrocatalysts towards oxygen reduction (ORR) and oxygen evolution reactions (OER) for fuel cell and water splitting systems. Herein, we fabricated ternary CoNiMn-Layered double hydroxides (LDH)/polypyrrole (PPy)/reduced graphene oxide (RGO) composite by one-step involving formation of the LDH and polymerization of the pyrrole (Py). Because of the synergistic effect among the different compositions, the prepared CoNiMn-LDH/PPy/RGO composite exhibits excellent bifunctional electrocatalytic activities with the lowest Delta E (E-OER,E- 10mAcm-2-EORR,E--3mAcm-2) value of 0.85 V among the nonprecious metal bifunctional electrocatalysts as reported in the literatures, and good electrochemical durability for the ORR and the OER in alkaline media. The CoNiMn-LDH/PPy/RGO as one of non-precious metal electrocatalysts shows promising applications in a potential system for fuel cells and water splitting systems. (C) 2017 Elsevier Ltd. All rights reserved.