中文摘要：

采用水热法和低温浸渍法制备了电子助剂还原石墨烯（rGO）和界面活性位点Ni（Ⅱ）共修饰的高效TiO2光催化剂（简称Ni（Ⅱ）/TiO2-rGO）。制氢性能测试结果表明：相比于TiO2和单独还原石墨烯复合的TiO2,经还原石墨烯与Ni（Ⅱ）协同修饰后的TiO2表现出更高的光催化制氢性能。其中,Ni（Ⅱ）/TiO2-rGO（0.1 mol·L-1）具有最高制氢性能,制氢速率达到77.0μmol·h-1,分别是TiO2（16.4μmol·h-1）和TiO2-rGO（28.0μmol·h-1）的4.70倍和2.75倍。还原石墨烯助剂与Ni（Ⅱ）活性位点协同增强制氢性能的原理是：还原石墨烯作为电子助剂可以快速捕获和传输电子,Ni（Ⅱ）作为界面活性位点可以从溶液中捕获H＋,提高界面反应速率,2种助剂协同作用加快了TiO2上的光生电子-空穴对的有效分离。

英文摘要：

Highly efficient TiO： photocatalysts co-modified by reduced graphene oxide （rGO） as electron -transfer mediator and Ni（Ⅱ） as interracial catalytic active-sites （referred to as Ni（Ⅱ）/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（Ⅱ）/TiO2-rGO photocatalysts exhibited obviously high H2-production performance. The highest Hz- production rate of the resultant Ni（Ⅱ）/TiO2-rGO （0.1 mol-L-1） reached 77.0 p, mol. h-1, while this value was higher than that of the TiO2 （16.4μ mol＇h-） and TiO2-rGO （28.0 μmol.h-1） by a factor of 4.70 and 2.75, respectively. On the basis of the experimental resuhs,a synergistic effect mechanism of rGO and Ni（Ⅱ） bi-cocatalysts was proposed to account for its enhanced H2-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.