An In Situ Simultaneous Reduction-Hydrolysis Technique for Fabrication of TiO2-Graphene 2D Sandwich-Like Hybrid Nanosheets: Graphene-Promoted Selectivity of Photocatalytic-Driven Hydrogenation and Coupling of CO2 into Methane and Ethane
An In Situ Simultaneous Reduction-Hydrolysis Technique for Fabrication of TiO2-Graphene 2D Sandwich-Like Hybrid Nanosheets: Graphene-Promoted Selectivity of Photocatalytic-Driven Hydrogenation and Coupling of CO2 into Methane and Ethane
复制标题
用于制造 TiO2-石墨烯二维三明治状杂化纳米片的原位同步还原-水解技术：石墨烯促进光催化加氢的选择性以及将 CO2 偶联成甲烷和乙烷
DOI：
10.1002/adfm.201202349
复制
发表时间：
2013-04-12
影响因子：
19
通讯作者：
Zou, Zhigang
中科院分区：
文献类型：
--
作者：
Tu, Wenguang;Zhou, Yong;Zou, Zhigang
发展了一种新的原位同时还原-水解技术（SRH），在乙二胺/水二元溶剂中制备TiO 2-石墨烯杂化纳米片。SRH技术是基于同时通过En将氧化石墨烯（GO）还原成石墨烯和通过二羟基钛（IV）（乳酸铵）水解形成TiO 2纳米颗粒，随后通过化学键（TiOC键）原位负载到石墨烯上以形成2D类石墨烯纳米结构的机制。TiO 2的分散阻碍了还原过程中剥离的石墨烯片的塌陷和重新堆叠。与以前的G-TiO 2纳米复合材料相比，在本杂化材料的TiO 2表面上检测到丰富的Ti 3+，这是由还原剂En引起的。表面上的Ti 3+位点可以用作捕获光生电子以防止电子空穴对复合的位点。通过在水蒸气存在下将CO2光催化转化为有价值的碳氢化合物（CH 4和C2 H6）证实了G-TiO 2杂化物的高光催化活性。石墨烯和表面Ti 3+的协同作用有利于C2 H6的生成，且C2 H6的产率随石墨烯含量的增加而增加。该工作为石墨烯在选择性催化CC偶联反应中的新的重要应用开辟了新的途径
A novel, in situ simultaneous reduction-hydrolysis technique (SRH) is developed for fabrication of TiO2--graphene hybrid nanosheets in a binary ethylenediamine (En)/H2O solvent. The SRH technique is based on the mechanism of the simultaneous reduction of graphene oxide (GO) into graphene by En and the formation of TiO2 nanoparticles through hydrolysis of titanium (IV) (ammonium lactato) dihydroxybis, subsequently in situ loading onto graphene through chemical bonds (TiOC bond) to form 2D sandwich-like nanostructure. The dispersion of TiO2 hinders the collapse and restacking of exfoliated sheets of graphene during reduction process. In contrast with prevenient G-TiO2 nanocomposites, abundant Ti3+ is detected on the surface of TiO2 of the present hybrid, caused by reducing agent En. The Ti3+ sites on the surface can serve as sites for trapping photogenerated electrons to prevent recombination of electronhole pairs. The high photocatalytic activity of G-TiO2 hybrid is confirmed by photocatalytic conversion of CO2 to valuable hydrocarbons (CH4 and C2H6) in the presence of water vapor. The synergistic effect of the surface-Ti3+ sites and graphene favors the generation of C2H6, and the yield of the C2H6 increases with the content of incorporated graphene. The work may open a new doorway for new significant application of graphene for selectively catalytic CC coupling reaction