The use of nanostructured composites as catalyst supports is a promising route to prepare catalysts with high selectivity and productivity. In this work

reduced graphene oxide-TiO

2

(rGP-x) composites with a variation of reduced graphene oxide (rGO) content were synthesized by hydrothermal method. Pd/rGP-x catalysts were prepared in incipient-wetness impregnation method for the direct synthesis of H

2

O

2

from H

2

and O

2

. The morphology and electronic properties of catalysts were investigated by XPS

TEM

and Raman spectroscopy. The ratio of Pd

2+

/Pd

0

and the hydrophobicity of the catalysts were increased with the rising content of rGO. As the amount of rGO in the catalysts varied in the range of 0.025 wt%-2 wt%

the selectivity of H

2

O

2

exhibited a tendency of increasing firstly and then decreasing from 0.1 wt% to 2 wt%. It indicates that good catalytic performance for H

2

O

2

synthesis can be achieved only when appropriate amount of rGO is introduced. The H

2

O

2

selectivity and productivity of Pd/rGP-0.025 both improved remarkably compared with Pd/P25. This enhancement originated from the combined effects of the proper ratio of Pd

2+

/Pd

0

and hydrophobicity of the catalyst.