Trifunctional noble-metal-free multi-site electrocatalysts based on NiMn-LDH/CuCo 2 S 4 /rGO for energy-saving hydrogen generation via the UOR/HER/OER

A NiMn-LDH/CuCo 2 S 4 /rGO bifunctional electrocatalyst with remarkable active sites and charge transfer improvement resulting from the strong electrostatic coupling between rGO and NiMn-LDH/CuCo 2 S 4 shows remarkable performance for the OER and UOR.