Exfoliated and reorganized graphite oxide on titania nanoparticles as an auxiliary co-catalyst for photocatalytic solar conversion
Exfoliated and reorganized graphite oxide on titania nanoparticles as an auxiliary co-catalyst for photocatalytic solar conversion
复制标题
DOI：
10.1039/c1cp20697d
复制
发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Choi, Wonyong
中科院分区：
文献类型：
--
作者：
Park, Yiseul;Kang, Seung-Hee;Choi, Wonyong
通过氧化石墨（GO）的自发剥离和与纳米TiO 2的复合，制备了GO/TiO 2复合光催化剂，并将其作为太阳能转化制氢的光催化剂。GO/TiO 2在紫外光照射下表现出比裸TiO 2更强的光电流产生（以电极形式）和氢气产生（以浆料形式）的活性。GO/TiO_2光催化活性的提高归因于石墨层能够从激发态TiO_2中接受和传输电子，促进电荷分离。当GO与镀铂TiO 2（Pt/TiO 2）杂化时，与GO/TiO 2和Pt/TiO 2相比，表现出明显的光催化产氢协同效应。这表明，廉价和丰富的碳材料可以是一个很好的候选人的电子吸引水库和辅助助催化剂的光催化制氢。
The hybrid of graphite oxide (GO)/TiO2 was prepared through the spontaneous exfoliation of bulky graphite oxide and reorganization with TiO2 nanoparticles as a solar conversion and hydrogen-generating photocatalyst. GO/TiO2 showed enhanced activities for both photocurrent generation (in an electrode form) and hydrogen production (in a slurry form) than those of bare TiO2 under UV light irradiation. The enhanced photocatalytic activity of GO/TiO2 is ascribed to the ability of graphitie layers in accepting and transporting electrons from excited TiO2, promoting the charge separation. When GO was hybridized with platinized TiO2 (Pt/TiO2), it showed a marked synergistic effect for the photocatalytic hydrogen production compared with GO/TiO2 and Pt/TiO2. This indicates that the cheap and abundant carbon material can be a good candidate for an electron attracting reservoir and an auxiliary co-catalyst for the photocatalytic hydrogen production.