A gold nanodendrite-decorated layered double hydroxide as a bifunctional electrocatalyst for hydrogen and oxygen evolution reactions in alkaline media

摘要: In this work, a gold nanodendrites-CuMgFe layered double hydroxide composite (AuNDs@LDH) was introduced as bifunctional electrocatalyst for hydrogen and oxygen evolution reactions (HER OER, respectively) in alkaline media. AuNDs@LDH/GCE prepared by the coating of surface glassy carbon electrode using CuMgFe-LDH suspension, followed Au electrodeposition. Field emission scanning electron microscopy (FE-SEM) images energy dispersive X-ray spectroscopy (EDX) analysis showed that nanodendrite-like structures are formed on LDH film, while is electrodeposited nanoparticles GCE (AuNPs/GCE). The performance catalysts HER OER investigated polarization curves, Tafel plots electrochemical impedance (EIS). exhibited lowest onset potential highest current density comparison with AuNPs/GCE LDH@AuNPs/GCE both HER. lower values slope charge transfer resistance indicated kinetics AuNDs@LDH faster than those other studied electrodes. A durability test performed chronopotentiometry method reveals reactions. synergistic effect AuNDs high active area could be major parameters enhanced catalytic AuNDs@LDH. As result, strategy provides promising approach fabrication highly efficient metal nanostructure-decorated LDHs, which can used catalyst water electrolyzers.