| 石墨烯助剂与Ni(Ⅱ)活性位点协同增强TiO2制氢性能 |
| Synergistic Effect of Graphene as Electron-Transfer Mediator and Ni (Ⅱ) as Interfacial Catalytic Active Site for Enhanced H2-Production Performance of TiO2 |
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| 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77.0 μmol·h-1，分别是TiO2（16.4 μmol·h-1）和TiO2-rGO（28.0 μmol·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。 |
| 关键词: TiO2 协同效应 还原石墨烯 电子助剂 Ni(Ⅱ) 界面活性位点 |
| 基金项目: 国家自然科学基金（No.21477094）和国家级大学生创新创业训练计划项目（No.20161049720001）资助 |
| Abstract: 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 (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 H2-production rate of the resultant Ni (Ⅱ)/TiO2-rGO (0.1 mol·L-1) reached 77.0 μmol·h-1,while this value was higher than that of the TiO2(16.4 μmol·h-1) and TiO2-rGO (28.0 μmol·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 (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. |
| Keywords: TiO2 synergistic effect reduced graphene oxide (rGO) electron-transfer mediator Ni(Ⅱ) interfacial catalytic active-site |
| 投稿时间：2017-03-21 修订日期：2017-06-15 |
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| 张超颖,王苹,刘岩岩,胡灵娜.石墨烯助剂与Ni(Ⅱ)活性位点协同增强TiO2制氢性能[J].无机化学学报,2017,33(7):1132-1138. |
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