The MoO3/graphene/carbon nano-tube composites were synthesized via a facile hydrothermal method. The morphology of the materials were observed using scanning electron microscope (SEM) and the structures were characterized
with X-ray diffraction (XRD). The electro catalytic activity of oxygen reduction of the materials were measured by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The results revealed that the composites exhibited better electro catalytic activity towards oxygen reduction with a higher oxygen reduction current and more positive oneset potential than pure MoO3. The microbial fuel cell assembled with 3 mg·cm-2 MoO3/GNS/CNT composites as cathode catalyst delivered a higher power density of 510 mW·m-2
which was 83% as much as the MFCs using Pt/C-catalyst cathode. Therefore
the inexpensive MoO3/GNS/CNT composites as MFCs cathode oxygen reduction catalyst had great potential for application.