▎ 摘　　要

Highly efficient TiO2 photocatalysts co-modified by reduced graphene oxide (rGO) as electron-transfer mediator and Ni(II) as interfacial catalytic active-sites (referred to as Ni(ll)/TiO2-rGO) were synthesized via a two-step process including the initial hydrothermal method of rGO on the TiO2 surface and the following low temperature impregnation method of Ni (II) on the rGO. Photocatalytic experimental results indicated that all resulted Ni (I)/TiO2-rGO photocatalysts exhibited obviously high H-2-production performance. The highest H-2 production rate of the resultant Ni(M/TiO2-rGO (0.1 mol-L-1 reached 77.0 mu mol.h(-1), while this value was higher than that of the TiO2 (16.4 mu mol.h(-1)) and TiO2-rGO (28.0 mu mol.h(-1)) by a factor of 4.70 and 2.75, respectively. On the basis of the experimental results,a synergistic effect mechanism of rGO and Ni(ll) bi-cocatalysts was proposed to account for its enhanced H-2-production performance, namely, rGO functions as an electron-transfer mediator to rapidly capture and transfer the photogenerated electron from TiO2 surface, while the Ni(II) cocatalyst serves as an effectively active site for the following reduction.