In-situ growth of ultrathin cobalt monoxide nanocrystals on reduced graphene oxide substrates: an efficient electrocatalyst for aprotic Li–O2 batteries

摘要: Large over-potentials during battery operation remain a big obstacle for aprotic Li–O2 batteries. Herein, nanocomposite of about 4 nm cobalt monoxide nanocrystals grown in situ on reduced graphene oxide substrates (CoO/RGO) has been synthesized via thermal decomposition method. The CoO/RGO cathode delivers high initial capacity 14 450 mAh g−1 at current density 200 mA g−1. Simultaneously it displays little fading after 32 cycles with restriction 1000 Additionally, compared Ketjenblack and general CoO nanoparticles, ultrathin nanoparticle-decorated RGO electrode materials delaminated structure display an observable reduction over-potential These results demonstrate that the introduction improves performance CoO, which is promising strategy optimizing design electrocatalysts rechargeable