A tremella-like Ni76Co24 layered double hydroxides nanosheets as an efficient catalyst for oxygen evolution reaction

Abstract

The oxygen evolution reaction (OER), as a key half-reaction in water splitting for clean hydrogen energy, is kinetically sluggish and usually requires efficient electrocatalysts to reduce the overpotential. Herein, we report a simple method to synthesize novel two-dimensional Ni76Co24 layered double hydroxides (Ni76Co24–LDHs) nanosheets as an effective OER catalyst. The obtained Ni76Co24–LDHs display a low onset overpotential of 242 mV, along with an excellent cycling stability. The Tafel slope of Ni76Co24–LDHs is only 57 mV dec−1 which demonstrates an active kinetics for OER. The high catalytic activity of Ni76Co24–LDHs may be attributed to the porous tremella-like structure with large surface area, synergistic effect of Ni and Co, and a pinning of the Co3+/4+ and Ni3+/4+. More importantly, the high catalytic property and simple synthetic method of Ni76Co24–LDHs may have a promising potential for practical application.