Three-Dimensional Framework of Graphene Nanomeshes Shell/Co3O4 Synthesized as Superior Bifunctional Electrocatalyst for Zinc–Air Batteries

• DOI: 10.1021/acsami.7b13290
• Publication Date: 2017-11-07T13:01:53Z
• Authors: Congwei Wang; Zheng Zhao; Xiaofeng Li; Rui Yan; Jie Wang; Anni Li; Xiaoyong Duan; Junying Wang; Yong Liu; Junzhong Wang
• Keywords: Oxygen evolution; Overpotential; Heteroatom

The synthesis of durable and low-cost electrocatalyst is crucial but challenging. Here, we developed a one-pot pyrolysis approach toward the preparation heteroatom-doped hierarchical porous three-dimensional (3D) graphene frameworks decorated with multilayer shell-coated cobalt oxide nanocrystal. Large literal sheet size nanomeshes may stimulate rapid thermolysis cobalt-oleate complex to form Co3O4 nanocrystals in situ growth coating co-doped by boron nitrogen controlling heating rate up 600 °C. This new material worked as superior bifunctional on oxygen reduction reaction evolution commercial Pt/C better onset potential/half-wave potentials, larger current density, stability, stronger methanol tolerance. heteroatom co-doping into porous/curved confined 3D walls provided adequate accessibility created catalytic active sites ideal mass transport route for excellent activity redox oxygen. synthesized material-based Zn-air battery further confirmed its electrolytic high specific capacity smaller overpotential. method shows great potential scalable high-performance practical metal-air batteries fuel cells at low cost.