Two-dimensional graphene-like MoSe2 nanosheets anchored on hollow carbon nanofibers as a cathode catalyst for rechargeable Li–O2 batteries

Abstract

MoSe₂@HCNF hybrids are synthesized via a facile hydrothermal method. The as-synthesized MoSe₂@HCNF hybrids are used as the cathode catalyst of Li–O₂ batteries for the first time. The successful growth of MoSe₂ nanosheets on the surface of HCNF mitigates the agglomeration of MoSe₂ nanosheets and results in more edge sites exposed. And the electronic conductivity of the hybrids is enhanced by the combination of HCNF. Therefore, the MoSe₂@HCNF hybrids exhibit superior catalytic activity, especially the OER catalytic activity for the charge process. The charge over-potential of the Li–O₂ batteries is greatly reduced, delivering a charge voltage platform of ∼3.69 V at 0.1 mA cm⁻², and the cycle performance is improved. According to this study, it can be expected that metal selenides have a great potential to be used as the cathode catalyst for Li–O₂ batteries.